10-Q 1 psff.txt PSF UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q [X] Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended March 31, 2005 or [ ] Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to__________________ Commission File Number 0-19046 DEAN WITTER PORTFOLIO STRATEGY FUND L.P. (Exact name of registrant as specified in its charter) Delaware 13-3589337 (State or other jurisdiction of (I.R.S. Employer incorporation or organization) Identification No.) Demeter Management Corporation 330 Madison Avenue, 8th Floor New York, NY 10017 (Address of principal executive offices) (Zip Code) Registrant?s telephone number, including area code (212) 905-2700 (Former name, former address, and former fiscal year, if changed since last report) Indicate by check-mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes X No___________ Indicate by check-mark whether the registrant is an accelerated filer (as defined in Rule 12b-2 of the Exchange Act). Yes No X DEAN WITTER PORTFOLIO STRATEGY FUND L.P. INDEX TO QUARTERLY REPORT ON FORM 10-Q March 31, 2005

PART I. FINANCIAL INFORMATION Item 1. Financial Statements Statements of Financial Condition as of ~~June~~March 3031, ~~2004~~2005 (Unaudited) and December 31, ~~2003~~2004..........................2 Statements of Operations for the Quarters Ended ~~June~~March 3031, ~~2004~~2005 and ~~2003~~2004 (Unaudited)..................~~.......~~3 Statements of ~~Operations for the Six Months Ended June 30, 2004 and 2003 (Unaudited)...................4 Statements of~~ Changes in Partners'? Capital for the ~~Six~~Quarters ~~Months~~ Ended ~~June~~March 3031, ~~2004~~2005 and ~~2003~~2004 (Unaudited) ........54 Statements of Cash Flows for the ~~Six~~Quarters ~~Months~~ Ended ~~June~~March 3031, ~~2004~~2005 and ~~2003~~2004 (Unaudited).........................65 Notes to Financial Statements (Unaudited)...............76-11 Item 2. Management'?s Discussion and Analysis of Financial Condition and Results of Operations.......12-2521 Item 3. Quantitative and Qualitative Disclosures about Market Risk.........................................~~26-38~~22?34 Item 4. Controls and Procedures................................3935 PART II. OTHER INFORMATION Item 5. Other Information...................................~~40-41~~...36 Item 6. Exhibits ~~and Reports on Form 8-K~~....................42........................36-4338

PART I. FINANCIAL INFORMATION Item 1. Financial Statements DEAN WITTER PORTFOLIO STRATEGY FUND L.P. STATEMENTS OF FINANCIAL CONDITION

~~June~~March 3031, December 31, 2005 2004 ~~2003~~ $ $ (Unaudited) ASSETS Equity in futures interests trading accounts: Cash 6963,~~964~~802,~~964~~430 7875,~~764~~358,~~319~~098 Net unrealized ~~loss~~gain on open contracts (~~MSIL~~MS&Co.) ~~(568~~1,~~475)~~950,211 ~~(49~~8,~~642)~~306,807 Net unrealized gain ~~(loss)~~ on open contracts (~~MS&Co.~~MSIL) (4791,~~896,462)~~314 6346,~~275,965~~786 Total net unrealized gain ~~(loss)~~ on open contracts (52,~~464~~741,~~937)~~525 68,~~226~~653,~~323~~593 Total Trading Equity 6466,~~500~~543,~~027~~955 84,~~990~~011,~~642~~691 Due from Morgan Stanley DW ~~508~~323,~~656~~837 ~~253~~346,~~962~~576 Interest receivable (Morgan Stanley DW) 45117,~~391~~538 4692,~~351~~757 Total Assets 6566,~~054~~985,~~074~~330 8584,~~290~~451,~~955~~024 LIABILITIES AND PARTNERS'? CAPITAL Liabilities Redemptions payable ~~623~~761,~~527~~607 ~~606~~520,~~561~~757 Accrued administrative expenses ~~204~~155,~~723~~019 ~~188~~141,~~366~~903 Management fees payable ~~108~~111,~~263~~608 ~~142~~140,~~074~~750 Total Liabilities ~~936~~1,~~513~~028,234 ~~937~~803,~~001~~410 Partners'? Capital Limited Partners (2422,~~255~~358.~~825~~951 and 2522,~~405~~957.~~557~~780 Units, respectively) 6365,~~364~~117,~~401~~435 8382,~~407~~610,~~424~~177 General Partner (288.309 Units) ~~753~~839,~~160~~661 ~~946~~1,~~530~~037,437 Total Partners'? Capital 6465,~~117~~957,~~561~~096 8483,~~353~~647,~~954~~614 Total Liabilities and Partners'? Capital 6566,~~054~~985,~~074~~330 8584,~~290~~451,~~955~~024 NET ASSET VALUE PER UNIT 2,~~612~~912.3437 3,~~283~~598.0435 The accompanying notes are an integral part of these financial statements.

DEAN WITTER PORTFOLIO STRATEGY FUND L.P. STATEMENTS OF OPERATIONS (Unaudited)

For the Quarters Ended ~~June~~March 3031, 2005 2004 ~~2003~~ $ $ ~~REVENUES~~INVESTMENT ~~Trading~~INCOME ~~profit (loss): Realized (14,678,965) 4,173,831 Net change in unrealized (6,143,624) (4,255,712) Total Trading Results (20,822,589) (81,881)~~ Interest income (Morgan Stanley DW) ~~145~~308,~~674~~743 ~~235~~156,~~135~~331 ~~Total (20,676,915) 153,254~~ EXPENSES Brokerage commissions (Morgan Stanley DW) 1,~~302~~272,~~496~~073 1,~~708~~356,~~752~~672 Management fees ~~362~~345,~~281~~136 ~~517~~455,~~478~~189 Transaction fees and costs 9269,~~958~~472 ~~108~~79,~~052~~460 Administrative expenses 2634,000 4724,000 Incentive fee -? 154,~~642~~033 Total Expenses 1,~~783~~720,~~735~~681 21,~~396~~919,~~924~~354 NET INVESTMENT LOSS (221,~~460~~411,~~650~~938) (21,~~243~~763,~~670~~023) TRADING RESULTS Trading profit (loss): Realized (8,583,968) 13,236,498 Net change in unrealized (5,912,068) (5,547,636) Total Trading Results (14,496,036) 7,688,862 NET INCOME (LOSS) (15,907,974) 5,925,839 NET INCOME (LOSS) ALLOCATION Limited Partners (2215,~~200~~710,~~841~~198) (25,~~221~~859,~~375)~~400 General Partner (~~259~~197,~~809~~776) ~~(22~~66,~~295)~~439 NET INCOME (LOSS) PER UNIT Limited Partners (~~901~~685.1498) ~~(84~~230.~~85)~~44 General Partner (~~901~~685.1498) ~~(84~~230.~~85)~~44 The accompanying notes are an integral part of these financial statements.

DEAN WITTER PORTFOLIO STRATEGY FUND L.P. STATEMENTS OF CHANGES IN PARTNERS? CAPITAL For the Quarters Ended March 31, 2005 and 2004 (Unaudited)

~~For~~Units ~~the~~of ~~Six~~Partnership ~~Months~~Limited ~~Ended~~General ~~June~~Interest ~~30,~~Partners ~~2004~~Partner ~~2003~~Total $ $ ~~REVENUES~~$ ~~Trading~~Partners? ~~profit~~Capital, ~~(loss):~~December ~~Realized~~31, (12003 25,~~442,467)~~693.866 3383,~~290~~407,~~784~~424 ~~Net change in unrealized (11~~946,~~691,260)~~530 ~~(17~~84,~~057~~353,~~944)~~954 ~~Total~~Net ~~Trading~~Income ~~Results~~? ~~(13~~5,~~133~~859,~~727)~~400 1666,~~232~~439 5,~~840~~925,839 ~~Interest~~Redemptions ~~income~~ (~~Morgan Stanley DW~~626.295) ~~302~~(2,~~005 458~~205,~~952~~284) ~~Total~~? (122,~~831~~205,~~722~~284) 16Partners? Capital,~~691,792~~ ~~EXPENSES~~March ~~Brokerage~~31, ~~commissions~~2004 ~~(Morgan Stanley DW) 2~~25,~~659,168~~067.571 387,~~140~~061,~~327~~540 ~~Management fees 817,470~~ 1,~~048~~012,~~057~~969 ~~Transaction fees and costs 172~~88,~~418 188~~074,~~126~~509 ~~Administrative~~Partners? ~~expenses 50~~Capital,~~000~~ 99December 31,~~000~~ ~~Incentive~~2004 ~~fees 4~~23,~~033~~246.089 ~~974~~82,~~225~~610,177 ~~Total 3~~1,~~703~~037,~~089~~437 583,~~449~~647,~~735~~614 ~~NET~~Net ~~INCOME~~Loss ? (~~LOSS~~15,710,198) (16197,~~534,811~~776) 11(15,~~242~~907,~~057~~974) ~~NET~~Redemptions ~~INCOME~~ (~~LOSS~~598.829) ~~ALLOCATION Limited Partners~~ (161,~~341~~782,~~441~~544) ~~11,115,044~~? ~~General Partner~~ (~~193~~1,~~370) 127~~782,~~013 NET INCOME (LOSS~~544) ~~PER~~Partners? ~~UNIT~~Capital, ~~Limited~~March ~~Partners~~31, ~~(670.70)~~2005 ~~393~~22,647.07260 ~~General~~65,117,435 ~~Partner~~839,661 ~~(670.70)~~65,957,096 ~~393.07~~ The accompanying notes are an integral part of these financial statements.

DEAN WITTER PORTFOLIO STRATEGY FUND L.P. STATEMENTS OF CASH FLOWS (Unaudited)

~~Units~~For ofthe ~~Partnership~~Quarters ~~Limited~~Ended ~~General~~March ~~Interest~~31, ~~Partners~~2005 ~~Partner~~2004 ~~Total~~ $ $ $CASH ~~Partners'~~FLOWS ~~Capital,~~FROM ~~December~~OPERATING ~~31,~~ACTIVITIES ~~2002~~Net ~~28,091.049~~income 87(loss) (15,~~947~~907,~~142~~974) ~~989~~5,~~099 88~~925,~~936,241~~839 Noncash item included in net income (loss): Net ~~Income~~change -in 11unrealized 5,~~115~~912,~~044~~068 ~~127~~5,~~013~~547,636 11(Increase) decrease in operating assets: Due from Morgan Stanley DW 22,~~242~~739 (118,~~057~~921) ~~Redemptions~~Interest receivable (~~1,059.217~~Morgan Stanley DW) (324,~~880,074~~781) (9012,~~000~~197) Increase (~~3,970,074~~decrease) ~~Partners'~~in ~~Capital,~~operating ~~June~~liabilities: ~~30,~~Accrued ~~2003~~administrative ~~27,031.832~~expenses 9513,~~182,112~~116 1,~~026~~736 Management fees payable (29,~~112~~142) 966,~~208,224~~156 ~~Partners'~~Net ~~Capital,~~cash ~~December~~provided ~~31,~~by ~~2003~~(used ~~25,693.866~~for) 83operating activities (10,~~407~~013,~~424~~974) ~~946~~11,~~530 84~~350,~~353,954~~249 ~~Net~~CASH ~~Loss~~FLOWS -FROM FINANCING ACTIVITIES Cash paid from redemptions of Units (161,~~341~~541,~~441~~694) (~~193~~2,~~370) (16~~244,~~534,811~~596) ~~Redemptions~~Cash used for financing activities (1,~~149.732~~541,694) (32,~~701~~244,~~582~~596) -Net increase (3decrease) in cash (11,~~701~~555,~~582~~668) ~~Partners' Capital~~9,105,653 ~~June~~Balance ~~30,~~at ~~2004~~beginning 24of period 75,~~544.134~~358,098 6378,~~364~~764,~~401~~319 ~~753~~Balance at end of period 63,~~160~~802,430 6487,~~117~~869,~~561~~972 The accompanying notes are an integral part of these financial statements.

DEAN WITTER PORTFOLIO STRATEGY FUND L.P. NOTES TO FINANCIAL STATEMENTS March 31, 2005 (Unaudited) The unaudited financial statements contained herein include, in the opinion of management, all adjustments necessary for a fair presentation of the results of operations and financial condition of Dean Witter Portfolio Strategy Fund L.P. (the ?Partnership?). The financial statements and condensed notes herein should be read in conjunction with the Partnership?s December 31, 2004 Annual Report on Form 10-K. Certain reclassifications have been made to the prior year?s financial statements to conform to the current year presentation. Such reclassifications have no impact on the Partnership?s reported net income (loss). 1. Organization Dean Witter Portfolio Strategy Fund L.P. is a Delaware limited partnership organized in 1990 to engage primarily in the speculative trading of futures and forward contracts on physical commodities and other commodity interests, including, but not limited to, foreign currencies, financial instruments, metals, energy, and agricultural products. The Partnership?s general partner is Demeter Management Corporation (?Demeter?). The non-clearing commodity broker is Morgan Stanley DW Inc. (?Morgan Stanley DW?). The clearing DEAN WITTER PORTFOLIO STRATEGY FUND L.P. NOTES TO FINANCIAL STATEMENTS (CONTINUED) commodity brokers are Morgan Stanley & Co. Incorporated (?MS & Co.?) and Morgan Stanley & Co. International Limited (?MSIL?). Demeter, Morgan Stanley DW, MS & Co., and MSIL are wholly-owned subsidiaries of Morgan Stanley. John W. Henry & Company, Inc. (the ?Trading Manager?) is the trading manager to the Partnership. 2. Related Party Transactions The Partnership?s cash is on deposit with Morgan Stanley DW, MS & Co., and MSIL in futures and forwards trading accounts to meet margin requirements as needed. Monthly, Morgan Stanley DW pays the Partnership interest income equal to 80% of its average daily Net Assets for the month at a prevailing rate on U.S. Treasury bills. The Partnership pays brokerage commissions to Morgan Stanley DW. 3. Financial Instruments The Partnership trades futures and forward contracts on physical commodities and other commodity interests, including, but not limited to, foreign currencies, financial instruments, metals, energy, and agricultural products. Futures and forwards represent contracts for delayed delivery of an instrument at a specified date and price. Risk arises from changes in the value of these contracts and the potential inability of counterparties to perform under the terms of the contracts. There are numerous factors DEAN WITTER PORTFOLIO STRATEGY FUND L.P. NOTES TO FINANCIAL STATEMENTS (CONTINUED) which may significantly influence the market value of these contracts, including interest rate volatility. The market value of exchange-traded contracts is based on the settlement price quoted by the exchange on the day with respect to which market value is being determined. If an exchange-traded contract could not have been liquidated on such day due to the operation of daily limits or other rules of the exchange, the settlement price shall be the settlement price on the first subsequent day on which the contract could be liquidated. The market value of off-exchange-traded contracts is based on the fair market value quoted by the counterparty. The Partnership?s contracts are accounted for on a trade-date basis and marked to market on a daily basis. The Partnership accounts for its derivative investments in accordance with the provisions of Statement of Financial Accounting Standards No. 133, ?Accounting for Derivative Instruments and Hedging Activities? (?SFAS No. 133?). SFAS No. 133 defines a derivative as a financial instrument or other contract that has all three of the following characteristics: 1) One or more underlying notional amounts or payment provisions; DEAN WITTER PORTFOLIO STRATEGY FUND L.P. NOTES TO FINANCIAL STATEMENTS (CONTINUED) 2) Requires no initial net investment or a smaller initial net investment than would be required relative to changes in market factors; 3) Terms require or permit net settlement. Generally, derivatives include futures, forward, swaps or options contracts, and other financial instruments with similar characteristics such as caps, floors, and collars. The net unrealized gains (losses) on open contracts, reported as a component of ?Equity in futures interests trading accounts? on the Statements of Financial Condition, and their longest contract maturities were as follows: Net Unrealized Gains/(Losses) on Open Contracts Longest Maturities Off- Off- Exchange- Exchange- Exchange- Exchange- Date Traded Traded Total Traded Traded $ $ $ Mar. 31, 2005 4,857,863 (2,116,338) 2,741,525 Mar. 2006 Jun. 2005 Dec. 31, 2004 1,244,992 7,408,601 8,653,593 Dec. 2005 Mar. 2005 The Partnership has credit risk associated with counterparty non- performance. The credit risk associated with the instruments in which the Partnership trades is limited to the amounts reflected in the Partnership?s Statements of Financial Condition. DEAN WITTER PORTFOLIO STRATEGY FUND L.P. NOTES TO FINANCIAL STATEMENTS (CONTINUED) The Partnership also has credit risk because Morgan Stanley DW, MS & Co., and MSIL act as the futures commission merchants or the counterparties, with respect to most of the Partnership?s assets. Exchange-traded futures and forward contracts are marked to market on a daily basis, with variations in value settled on a daily basis. Morgan Stanley DW, MS & Co., and MSIL, each as a futures commission merchant for the Partnership?s exchange-traded futures and forward contracts, are required, pursuant to regulations of the Commodity Futures Trading Commission (?CFTC?), to segregate from their own assets, and for the sole benefit of their commodity customers, all funds held by them with respect to exchange-traded futures and forward contracts, including an amount equal to the net unrealized gains (losses) on all open futures and forward contracts, which funds, in the aggregate, totaled $68,660,293 and $76,603,090 at March 31, 2005 and December 31, 2004, respectively. With respect to the Partnership?s off-exchange- traded forward currency contracts, there are no daily exchange- required settlements of variation in value, nor is there any requirement that an amount equal to the net unrealized gains (losses) on open forward contracts be segregated. However, the Partnership is required to meet margin requirements equal to the net unrealized loss on open contracts in the Partnership accounts with the counterparty, which is accomplished by daily maintenance of the cash balance in a custody account held at Morgan Stanley DW DEAN WITTER PORTFOLIO STRATEGY FUND L.P. NOTES TO FINANCIAL STATEMENTS (CONCLUDED) for the benefit of MS & Co. With respect to those off-exchange- traded forward currency contracts, the Partnership is at risk to the ability of MS & Co., the sole counterparty on all such contracts, to perform. The Partnership has a netting agreement with MS & Co. This agreement, which seeks to reduce both the Partnership?s and MS & Co.?s exposure on off-exchange-traded forward currency contracts, should materially decrease the Partnership?s credit risk in the event of MS & Co.?s bankruptcy or insolvency. Item 2. MANAGEMENT?S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS Liquidity. The Partnership deposits its assets with Morgan Stanley DW as non-clearing broker, and MS & Co. and MSIL as clearing brokers in separate futures and forwards trading accounts established for the Trading Manager. Such assets are used as margin to engage in trading and may be used as margin solely for the Partnership?s trading. The assets are held in either non- interest bearing bank accounts or in securities and instruments permitted by the CFTC for investment of customer segregated or secured funds. Since the Partnership?s sole purpose is to trade in futures and forwards, it is expected that the Partnership will continue to own such liquid assets for margin purposes. The Partnership?s investment in futures and forwards may, from time to time, be illiquid. Most U.S. futures exchanges limit fluctuations in prices during a single day by regulations referred to as ?daily price fluctuations limits? or ?daily limits?. Trades may not be executed at prices beyond the daily limit. If the price for a particular futures contract has increased or decreased by an amount equal to the daily limit, positions in that futures contract can neither be taken nor liquidated unless traders are willing to effect trades at or within the limit. Futures prices have occasionally moved the daily limit for several consecutive days with little or no trading. These market conditions could prevent the Partnership from promptly liquidating its futures contracts and result in restrictions on redemptions. There is no limitation on daily price moves in trading forward contracts on foreign currencies. The markets for some world currencies have low trading volume and are illiquid, which may prevent the Partnership from trading in potentially profitable markets or prevent the Partnership from promptly liquidating unfavorable positions in such markets, subjecting it to substantial losses. Either of these market conditions could result in restrictions on redemptions. For the periods covered by this report, illiquidity has not materially affected the Partnership?s assets. There are no known material trends, demands, commitments, events, or uncertainties at the present time that are reasonably likely to result in the Partnership?s liquidity increasing or decreasing in any material way. Capital Resources. The Partnership does not have, nor expects to have, any capital assets. Redemptions of units of limited partnership interest (?Unit(s)?) in the future will affect the amount of funds available for investments in futures and forwards in subsequent periods. It is not possible to estimate the amount, and therefore the impact, of future outflows of Units. There are no known material trends, favorable or unfavorable, that would affect, nor any expected material changes to, the Partnership?s capital resource arrangements at the present time. Off-Balance Sheet Arrangements and Contractual Obligations. The Partnership does not have any off-balance sheet arrangements, nor does it have contractual obligations or commercial commitments to make future payments that would affect its liquidity or capital resources. Results of Operations General. The Partnership?s results depend on the Trading Manager and the ability of the Trading Manager?s trading program to take advantage of price movements in the futures and forwards markets. The following presents a summary of the Partnership?s operations for the three month periods ended March 31, 2005 and 2004, and a general discussion of its trading activities during each period. It is important to note, however, that the Trading Manager trades in various markets at different times and that prior activity in a particular market does not mean that such market will be actively traded by the Trading Manager or will be profitable in the future. Consequently, the results of operations of the Partnership are difficult to discuss other than in the context of the Trading Manager?s trading activities on behalf of the Partnership during the period in question. Past performance is no guarantee of future results. The Partnership?s results of operations set forth in the financial statements on pages 2 through 11 of this report are prepared in accordance with accounting principles generally accepted in the United States of America, which require the use of certain accounting policies that affect the amounts reported in these financial statements, including the following: The contracts the Partnership trades are accounted for on a trade- date basis and marked to market on a daily basis. The difference between their cost and market value is recorded on the Statements of Operations as ?Net change in unrealized trading profit (loss)? for open (unrealized) contracts, and recorded as ?Realized trading profit (loss)? when open positions are closed out. The sum of these amounts constitutes the Partnership?s trading results. The market value of a futures contract is the settlement price on the exchange on which that futures contract is traded on a particular day. The value of foreign currency forward contracts is based on the spot rate as of the close of business. Interest income, as well as management fees, incentive fees, and brokerage commissions expenses of the Partnership are recorded on an accrual basis. Demeter believes that, based on the nature of the operations of the Partnership, no assumptions relating to the application of critical accounting policies other than those presently used could reasonably affect reported amounts. For the Quarter Ended March 31, 2005 The Partnership recorded total trading results including interest income totaling $(14,187,293) and expenses totaling $1,720,681, resulting in a net loss of $15,907,974 for the quarter ended March 31, 2005. The Partnership?s net asset value per Unit decreased from $3,598.35 at December 31, 2004 to $2,912.37 at March 31, 2005. The most significant trading losses of approximately 19.1% were incurred in the currency markets throughout the quarter from long positions in a variety of foreign currencies versus the U.S. dollar. During January, long European currency and Japanese yen positions against the U.S. dollar resulted in losses after the U.S. dollar?s value reversed sharply higher amid conflicting economic data, improvements in the U.S. trade deficit numbers from November, and speculation for higher U.S. interest rates. The U.S. dollar also advanced in response to speculation that the Chinese government would postpone its revaluation of the Chinese yuan for the future. During February, currency sector losses stemmed from long yen positions early in the month as the U.S. dollar?s value touched a two-month high against the yen due to positive sentiment for the Bush Administration?s budget proposal. Relaxed speculation that China would revalue its currency following the Group of Seven (?G-7 countries?) meetings also boosted the U.S. dollar. The G-7 countries consist of France, the U.S., Britain, Germany, Japan, Italy, and Canada. Further losses during February were recorded from newly established short yen positions, as well as from existing short European currency positions, against the U.S. dollar, as the U.S. dollar weakened due to concerns for the considerable U.S. Current-Account deficit as expressed by Federal Reserve Chairman Alan Greenspan. The U.S. dollar weakened further due to a larger-than-expected drop in January?s leading economic indicators and news that South Korea?s Central Bank planned to reduce its U.S. dollar currency reserves. During March, losses resulted from long European currency positions versus the U.S. dollar after the U.S. dollar reversed sharply higher in response to an increase in U.S. interest rates and concerns for inflation. Additional losses of approximately 4.2% in the global interest rate markets were recorded during February and March. Long positions in European interest rate futures experienced losses during February as prices reversed lower after positive economic data and expectations for higher interest rates reduced investor demand for fixed-income investments. During March, short positions in European and Japanese interest rate futures experienced additional losses due to higher prices resulting from overall weakness in global equity markets and the emergence of poor Japanese economic data that signaled the potential for another recession in that country. Losses of approximately 2.1% recorded in the metals markets were incurred throughout the quarter from positions in precious metals futures. Long positions during January recorded losses after prices weakened amid renewed strength in the U.S. dollar, lower equity prices, and news of a drop in Chinese demand. Losses recorded during February stemmed from short precious metals futures positions after prices advanced amid speculative buying spurred by U.S. dollar weakness. During March, long futures positions in precious metals incurred losses after prices declined amid renewed U.S. dollar strength. A portion of the Partnership?s overall losses was offset by gains of approximately 5.4% recorded in the energy markets, primarily during February and March, from long futures positions in crude oil and its related products. During February, long futures positions benefited as prices climbed higher in response to International Energy Agency announcements alerting to possible supply reductions caused by increased demand from China. Fears of terror attacks against production facilities in the Middle East, cold weather in the Northeastern U.S., and the perception that OPEC was intent on maintaining higher price levels also boosted prices. During March, long positions profited from rising prices bolstered by OPEC?s announcements for no increases in output. Also boosting prices was an Energy Information Administration report that stated U.S. inventories of gasoline and heating oil measured significantly lower-than-expected. The weaker U.S. dollar value also triggered crude oil demand from countries such as Japan and China. Finally, prices soared at the end of March after Goldman Sachs analysts warned that oil prices could reach $105 a barrel in the future. Additional sector gains were achieved from long futures positions in natural gas as prices advanced in tandem with crude oil prices. Gains of approximately 0.3% were achieved in the global stock index markets, during February, from long positions in Pacific Rim and European equity index futures as equity prices moved higher amid successful elections in Iraq and lower-than expected U.S. unemployment data. Long positions in Pacific Rim equity index futures continued to profit as prices advanced after positive economic data reflected the potential for future economic growth in the Far East. Finally, stronger-than-expected growth in U.S. Gross Domestic Product pushed global stocks higher as investors welcomed the benefits of an improving economy. Finally, Partnership gains of approximately 0.3% were recorded in the agricultural markets during January and March from long futures positions in coffee as prices rose amid support from speculative buying and concerns for dry weather in Brazilian growing regions. For the Quarter Ended March 31, 2004 The Partnership recorded total trading results including interest income totaling $7,845,193 and expenses totaling $1,919,354, resulting in net income of $5,925,839 for the quarter ended March 31, 2004. The Partnership?s net asset value per Unit increased from $3,283.04 at December 31, 2003 to $3,513.48 at March 31, 2004. The most significant trading gains of approximately 8.2% were recorded in the global interest rate futures markets from long positions in European and U.S. interest rate futures, primarily during January and February. Unimpressive economic data and comments from central banks, such as the European Central Bank and U.S. Federal Reserve, regarding a weak global inflationary environment that did not warrant an increase in interest rates caused bond prices to rally. Additional gains of approximately 4.8% were recorded in the energy markets during February and March from long futures positions in crude oil and its related products. Low market supply, falling inventory levels, and a production cut announcement from OPEC caused prices to increase during February. During March, long positions continued to profit as energy prices moved higher amid lower U.S. inventories, heavy demand from China, and fears of supply disruptions following the Madrid train bombings. In the agricultural markets, gains of approximately 2.7% were produced from long futures positions in corn, soybeans, and soybean-related products. Prices for these commodities finished higher due to increased exports abroad and greater demand from Asia. Additional gains of approximately 1.7% were recorded in the metals markets from long futures positions in copper and silver. Base and precious metals moved higher during the quarter, especially in February, as a lower U.S. dollar value triggered consistent demand from abroad. A portion of the Partnership?s overall gains was offset by losses of approximately 10.1% in the currency markets, primarily during March. Short Japanese yen positions against the U.S. dollar incurred the largest losses within this sector as the yen reversed higher due to speculation that the Bank of Japan was relaxing its efforts of intervention to weaken the yen. Other currency sector losses resulted from short positions in the euro versus the U.S. dollar as the euro?s value reversed higher during the final week of March amid market demand sparked by speculation that the European Central Bank would leave interest rates unchanged. Long positions in the Swiss franc versus the U.S. dollar contributed to sector losses during January and February as the dollar strengthened at various points due to expectations for hikes in U.S. interest rates. Item 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK Introduction The Partnership is a commodity pool engaged primarily in the speculative trading of futures and forwards. The market-sensitive instruments held by the Partnership are acquired for speculative trading purposes only and, as a result, all or substantially all of the Partnership?s assets are at risk of trading loss. Unlike an operating company, the risk of market-sensitive instruments is inherent to the primary business activity of the Partnership. The futures and forwards traded by the Partnership involve varying degrees of related market risk. Market risk is often dependent upon changes in the level or volatility of interest rates, exchange rates, and prices of financial instruments and commodities, factors that result in frequent changes in the fair value of the Partnership?s open positions, and consequently in its earnings, whether realized or unrealized, and cash flow. Gains and losses on open positions of exchange-traded futures and forwards are settled daily through variation margin. Gains and losses on off-exchange-traded forward currency contracts are settled upon termination of the contract, however, the Partnership is required to meet margin requirements equal to the net unrealized loss on open contracts in the Partnership accounts with the counterparty, which is accomplished by daily maintenance of the cash balance in a custody account held at Morgan Stanley DW for the benefit of MS & Co. The Partnership?s total market risk may increase or decrease as it is influenced by a wide variety of factors, including, but not limited to, the diversification among the Partnership?s open positions, the volatility present within the markets, and the liquidity of the markets. The face value of the market sector instruments held by the Partnership is typically many times the applicable margin requirements. Margin requirements generally range between 2% and 15% of contract face value. Additionally, the use of leverage causes the face value of the market sector instruments held by the Partnership to typically be many times the total capitalization of the Partnership. The Partnership?s past performance is no guarantee of its future results. Any attempt to numerically quantify the Partnership?s market risk is limited by the uncertainty of its speculative trading. The Partnership?s speculative trading and use of leverage may cause future losses and volatility (i.e., ?risk of ruin?) that far exceed the Partnership?s experience to date under the ?Partnership?s Value at Risk in Different Market Sectors? section and significantly exceed the Value at Risk (?VaR?) tables disclosed. Limited partners will not be liable for losses exceeding the current net asset value of their investment. Quantifying the Partnership?s Trading Value at Risk The following quantitative disclosures regarding the Partnership?s market risk exposures contain ?forward-looking statements? within the meaning of the safe harbor from civil liability provided for such statements by the Private Securities Litigation Reform Act of 1995 (set forth in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934). All quantitative disclosures in this section are deemed to be forward- looking statements for purposes of the safe harbor, except for statements of historical fact. The Partnership accounts for open positions on the basis of mark to market accounting principles. Any loss in the market value of the Partnership?s open positions is directly reflected in the Partnership?s earnings and cash flow. The Partnership?s risk exposure in the market sectors traded by the Trading Manager is estimated below in terms of VaR. The Partnership estimates VaR using a model based upon historical simulation (with a confidence level of 99%) which involves constructing a distribution of hypothetical daily changes in the value of a trading portfolio. The VaR model takes into account linear exposures to risk including equity and commodity prices, interest rates, foreign exchange rates, and correlation among these variables. The hypothetical changes in portfolio value are based on daily percentage changes observed in key market indices or other market factors (?market risk factors?) to which the portfolio is sensitive. The one-day 99% confidence level of the Partnership?s VaR corresponds to the negative change in portfolio value that, based on observed market risk factors, would have been exceeded once in 100 trading days, or one day in 100. VaR typically does not represent the worst case outcome. Demeter uses approximately four years of daily market data (1,000 observations) and revalues its portfolio (using delta-gamma approximations) for each of the historical market moves that occurred over this time period. This generates a probability distribution of daily ?simulated profit and loss? outcomes. The VaR is the appropriate percentile of this distribution. For example, the 99% one-day VaR would represent the 10th worst outcome from Demeter?s simulated profit and loss series. The Partnership?s VaR computations are based on the risk representation of the underlying benchmark for each instrument or contract and do not distinguish between exchange and non-exchange dealer-based instruments. They are also not based on exchange and/or dealer-based maintenance margin requirements. VaR models, including the Partnership?s, are continually evolving as trading portfolios become more diverse and modeling techniques and systems capabilities improve. Please note that the VaR model is used to numerically quantify market risk for historic reporting purposes only and is not utilized by either Demeter or the Trading Manager in their daily risk management activities. Please further note that VaR as described above may not be comparable to similarly titled measures used by other entities. The Partnership?s Value at Risk in Different Market Sectors The following table indicates the VaR associated with the Partnership?s open positions as a percentage of total net assets by primary market risk category at March 31, 2005 and 2004. At March 31, 2005 and 2004, the Partnership?s total capitalization was approximately $66 million and $88 million, respectively. Primary Market March 31, 2005 March 31, 2004 Risk Category Value at Risk Value at Risk Currency (3.23)% (2.20)% Interest Rate (1.65) (2.98) Equity (0.87) (1.24) Commodity (4.68) (3.32) Aggregate Value at Risk (5.85) % (5.06)% The VaR for a market category represents the one-day downside risk for the aggregate exposures associated with this market category. The Aggregate Value at Risk listed above represents the VaR of the Partnership?s open positions across all the market categories, and is less than the sum of the VaRs for all such market categories due to the diversification benefit across asset classes. Because the business of the Partnership is the speculative trading of futures and forwards, the composition of its trading portfolio can change significantly over any given time period, or even within a single trading day, which could positively or negatively materially impact market risk as measured by VaR. The table below supplements the quarter-end VaR set forth above by presenting the Partnership?s high, low, and average VaR, as a percentage of total net assets for the four quarter-end reporting periods from April 1, 2004 through March 31, 2005. Primary Market Risk Category High Low Average Currency (4.85)% (1.59)% (3.02)% Interest Rate (3.42) (1.50) (2.21) Equity (1.01) (0.37) (0.72) Commodity (4.68) (1.66) (3.36) Aggregate Value at Risk (6.31)% (3.70)% (5.46)% Limitations on Value at Risk as an Assessment of Market Risk VaR models permit estimation of a portfolio?s aggregate market risk exposure, incorporating a range of varied market risks; reflect risk reduction due to portfolio diversification or hedging activities; and can cover a wide range of portfolio assets. However, VaR risk measures should be viewed in light of the methodology?s limitations, which include, but may not be limited to the following: * past changes in market risk factors will not always result in accurate predictions of the distributions and correlations of future market movements; * changes in portfolio value caused by market movements may differ from those of the VaR model; * VaR results reflect past market fluctuations applied to current trading positions while future risk depends on future positions; * VaR using a one-day time horizon does not fully capture the market risk of positions that cannot be liquidated or hedged within one day; and * the historical market risk factor data used for VaR estimation may provide only limited insight into losses that could be incurred under certain unusual market movements. In addition, the VaR tables above, as well as the past performance of the Partnership, give no indication of the Partnership?s potential ?risk of ruin?. The VaR tables provided present the results of the Partnership?s VaR for each of the Partnership?s market risk exposures and on an aggregate basis at March 31, 2005, and for the four quarter-end reporting periods from April 1, 2004 through March 31, 2005. VaR is not necessarily representative of the Partnership?s historic risk, nor should it be used to predict the Partnership?s future financial performance or its ability to manage or monitor risk. There can be no assurance that the Partnership?s actual losses on a particular day will not exceed the VaR amounts indicated above or that such losses will not occur more than once in 100 trading days. Non-Trading Risk The Partnership has non-trading market risk on its foreign cash balances. These balances and any market risk they may represent are immaterial. The Partnership also maintains a substantial portion (approximately 93% as of March 31, 2005) of its available assets in cash at Morgan Stanley DW. A decline in short-term interest rates would result in a decline in the Partnership?s cash management income. This cash flow risk is not considered to be material. Materiality, as used throughout this section, is based on an assessment of reasonably possible market movements and any associated potential losses, taking into account the leverage, optionality, and multiplier features of the Partnership?s market- sensitive instruments, in relation to the Partnership?s net assets. Qualitative Disclosures Regarding Primary Trading Risk Exposures The following qualitative disclosures regarding the Partnership?s market risk exposures - except for (A) those disclosures that are statements of historical fact and (B) the descriptions of how the Partnership manages its primary market risk exposures - constitute forward-looking statements within the meaning of Section 27A of the Securities Act and Section 21E of the Securities Exchange Act. The Partnership?s primary market risk exposures, as well as the strategies used and to be used by Demeter and the Trading Manager for managing such exposures, are subject to numerous uncertainties, contingencies and risks, any one of which could cause the actual results of the Partnership?s risk controls to differ materially from the objectives of such strategies. Government interventions, defaults and expropriations, illiquid markets, the emergence of dominant fundamental factors, political upheavals, changes in historical price relationships, an influx of new market participants, increased regulation, and many other factors could result in material losses, as well as in material changes to the risk exposures and the risk management strategies of the Partnership. Investors must be prepared to lose all or substantially all of their investment in the Partnership. The following were the primary trading risk exposures of the Partnership at March 31, 2005, by market sector. It may be anticipated, however, that these market exposures will vary materially over time. Currency. The primary market exposure of the Partnership at March 31, 2005 was to the currency sector. The Partnership?s currency exposure is to exchange rate fluctuations, primarily fluctuations which disrupt the historical pricing relationships between different currencies and currency pairs. Interest rate changes, as well as political and general economic conditions influence these fluctuations. At March 31, 2005, the Partnership?s exposure was mostly to outright U.S. dollar positions. Outright positions consist of the U.S. dollar vs. other currencies. These other currencies include major and minor currencies. Demeter does not anticipate that the risk associated with the Partnership?s currency trades will change significantly in the future. Interest Rate. The second largest market exposure of the Partnership at March 31, 2005 was to the global interest rate sector. Exposure was primarily spread across the U.S., Japanese, European, and Australian interest rate sectors. Interest rate movements directly affect the price of the sovereign bond futures positions held by the Partnership and indirectly affect the value of its stock index and currency positions. Interest rate movements in one country, as well as relative interest rate movements between countries, materially impact the Partnership?s profitability. The Partnership?s primary interest rate exposure is generally to interest rate fluctuations in the U.S. and the other G-7 countries. However, the Partnership also takes futures positions in the government debt of smaller countries - e.g., Australia. Demeter anticipates that the G-7 countries and Australian interest rates will remain the primary interest rate exposure of the Partnership for the foreseeable future. The speculative futures positions held by the Partnership may range from short to long-term instruments. Consequently, changes in short, medium, or long-term interest rates may have an effect on the Partnership. Equity. At March 31, 2005, the Partnership had market exposure to the equity sector. Exposure was to equity price risk in the G-7 countries. The stock index futures traded by the Partnership are by law limited to futures on broadly-based indices. At March 31, 2005, the Partnership?s primary exposures were to the Euro Stoxx 50 (Europe), NASDAQ (U.S.), and DAX (Germany) stock indices. The Partnership is exposed to the risk of adverse price trends or static markets in the U.S., European, and Japanese stock indices. Static markets would not cause major market changes, but would make it difficult for the Partnership to avoid trendless price movements, resulting in numerous small losses. Commodity. Energy. At March 31, 2005, the Partnership had market exposure in the energy sector. The Partnership?s energy exposure was primarily to futures contracts in crude oil and its related products, and natural gas. Price movements in these markets result from geopolitical developments, particularly in the Middle East, as well as weather patterns and other economic fundamentals. Significant profits and losses, which have been experienced in the past, are expected to continue to be experienced in the future. Natural gas has exhibited volatility in prices resulting from weather patterns and supply and demand factors and will likely continue in this choppy pattern. Metals. At March 31, 2005, the Partnership had market exposure in the metals sector. The Partnership's metals exposure was to fluctuations in the price of base metals, such as copper, aluminum, nickel and zinc, and precious metals, such as gold and silver. Economic forces, supply and demand inequalities, geopolitical factors, and market expectations influence price movements in these markets. The Trading Manager utilizes the trading system(s) to take positions when market opportunities develop, and Demeter anticipates that the Partnership will continue to do so. Soft Commodities and Agriculturals. At March 31, 2005, the Partnership had market exposure to the markets that comprise these sectors. Most of the exposures were to the cotton, coffee, sugar, and soybean markets. Supply and demand inequalities, severe weather disruptions, and market expectations affect price movements in these markets. Qualitative Disclosures Regarding Non-Trading Risk Exposure The following was the only non-trading risk exposure of the Partnership at March 31, 2005: Foreign Currency Balances. The Partnership?s primary foreign currency balances at March 31, 2005 were in Japanese yen, euros, British pounds, and Australian dollars. The Partnership controls the non-trading risk of foreign currency balances by regularly converting them back into U.S. dollars upon liquidation of their respective positions. Qualitative Disclosures Regarding Means of Managing Risk Exposure The Partnership and the Trading Manager, separately, attempt to manage the risk of the Partnership?s open positions in essentially the same manner in all market categories traded. Demeter attempts to manage market exposure by diversifying the Partnership?s assets among different market sectors and trading approaches, and by monitoring the performance of the Trading Manager daily. In addition, the Trading Manager establishes diversification guidelines, often set in terms of the maximum margin to be committed to positions in any one market sector or market- sensitive instrument. Demeter monitors and controls the risk of the Partnership?s non- trading instrument, cash. Cash is the only Partnership investment directed by Demeter, rather than the Trading Manager. Item 4. CONTROLS AND PROCEDURES (a) As of the end of the period covered by this quarterly report, the President and Chief Financial Officer of Demeter, the general partner of the Partnership, have evaluated the effectiveness of the Partnership?s disclosure controls and procedures (as defined in Rules 13a?15(e) and 15d?15(e) of the Exchange Act), and have judged such controls and procedures to be effective. (b) There have been no material changes during the period covered by this quarterly report in the Partnership?s internal controls or in other factors that could significantly affect these controls subsequent to the date of their evaluation. PART II. OTHER INFORMATION Item 5. OTHER INFORMATION Departure of Directors or Principal Officers; Election of Directors; Appointment of Principal Officers. At a meeting of the Board of Directors of Demeter held on March 30, 2005, the following Directors of Demeter resigned, and the Board of Directors accepted such resignations effective May 1, 2005: Ms. Louise M. Wasso-Jonikas and Messrs. Raymond A. Harris, Todd Taylor, and William D. Seugling. At that March 30, 2005 meeting of the Board of Directors of Demeter, the Board of Directors elected two new Directors effective May 1, 2005, subject to approval by and registration with the National Futures Association: Ms. Shelley Hanan and Mr. Harry Handler. Item 6. EXHIBITS 3.01 Amended and Restated Limited Partnership Agreement of the Partnership, is incorporated by reference to Exhibit A of the Partnership?s Prospectus, dated May 12, 1997, filed with the Securities and Exchange Commission pursuant to Rule 424(b)(3) under the Securities Act of 1933 on May 13, 1997. 10.01 Amended and Restated Management Agreement among the Partnership, Demeter and John W. Henry and Company, Inc., dated as of May 12, 1997, is incorporated by reference to Exhibit 10.01 of the Partnership?s Form 10-Q for the quarter ended June 30, 2002 (File No. 0-19046) filed with the Securities and Exchange Commission on August 12, 2002. 10.01(a) Amendment to Amended and Restated Management Agreement between the Partnership and John Henry & Company, dated November 30, 2000, is incorporated by reference to Exhibit 10.01 of the Partnership?s Form 8-K (file No. 0- 19046) filed with the Securities and Exchange Commission on January 31, 2001. 10.02 Amended and Restated Customer Agreement between the Partnership and Morgan Stanley DW Inc., dated as of June 22, 2000, is incorporated by reference to Exhibit 10.01 of the Partnership?s Form 8-K (File No. 0-19046) filed with the Securities and Exchange Commission on November 13, 2001. 10.03 Commodity Futures Customer Agreement between Morgan Stanley & Co. Incorporated and the Partnership, and acknowledged and agreed to by Morgan Stanley DW Inc., dated as of May 1, 2000, is incorporated by reference to Exhibit 10.02 of the Partnership?s Form 8-K (File No. 0-19046) filed with the Securities and Exchange Commission on November 13, 2001. 10.04 Customer Agreement between the Partnership and Morgan Stanley & Co. International Limited, dated as of May 1, 2000, is incorporated by reference to Exhibit 10.04 of the Partnership?s Form 8-K (File No. 0-19046) filed with the Securities and Exchange Commission on November 13, 2001. 10.05 Foreign Exchange and Options Master Agreement between Morgan Stanley & Co. Incorporated and the Partnership, dated as of April 30, 2000, is incorporated by reference to Exhibit 10.05 of the Partnership?s Form 8-K (File No. 0-19046) filed with the Securities and Exchange Commission on November 13, 2001. 10.06 Amendment to Amended and Restated Management Agreement between the Partnership and John W. Henry & Company, Inc., dated as of November 30, 2000, is incorporated by reference to Exhibit 10.01 of the Partnership?s Form 8-K (File No. 0-19046) filed with the Securities and Exchange Commission on January 3, 2001. 10.07 Securities Account Control Agreement among the Partnership, Morgan Stanley & Co. Incorporated, and Morgan Stanley DW Inc., dated as of May 1, 2000, is incorporated by reference to Exhibit 10.03 of the Partnership?s Form 8-K (File No. 0-19046) filed with the Securities and Exchange Commission on November 13, 2001. 31.01 Certification of President of Demeter Management Corporation, the general partner of the Partnership pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. 31.02 Certification of Chief Financial Officer of Demeter Management Corporation, the general partner of the Partnership pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. 32.01 Certification of President of Demeter Management Corporation, the general partner of the Partnership, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. 32.02 Certification of Chief Financial Officer of Demeter Management Corporation, the general partner of the Partnership, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. Dean Witter Portfolio Strategy Fund L.P. (Registrant) By: Demeter Management Corporation (General Partner) May 16, 2005 By:/s/Kevin Perry Kevin Perry Chief Financial Officer The General Partner which signed the above is the only party authorized to act for the Registrant. The Registrant has no principal executive officer, principal financial officer, controller, or principal accounting officer and has no Board of Directors. DEAN WITTER PORTFOLIO STRATEGY FUND L.P. NOTES TO FINANCIAL STATEMENTS (CONCLUDED)

For the Six Months Ended June 30, 2004 2003 $ $ CASH FLOWS FROM OPERATING ACTIVITIES Net income (loss) (16,534,811) 11,242,057 Noncash item included in net income (loss): Net change in unrealized 11,691,260 17,057,944 (Increase) decrease in operating assets: Due from Morgan Stanley DW (254,694) (268,572) Interest receivable (Morgan Stanley DW) 960 4,079 Increase (decrease) in operating liabilities: Accrued administrative expenses 16,357 12,690 Management fees payable (33,811) 12,107 Net cash provided by (used for) operating activities (5,114,739) 28,060,305 CASH FLOWS FROM FINANCING ACTIVITIES Increase (decrease) in redemptions payable 16,966 (32,177) Redemptions of Units (3,701,582) (3,970,074) Net cash used for financing activities (3,684,616) (4,002,251) Net increase (decrease) in cash (8,799,355) 24,058,054 Balance at beginning of period 78,764,319 80,285,823 Balance at end of period 69,964,964 104,343,877 The accompanying notes are an integral part of these financial statements.

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