144 1 plan144.txt FORM 144 FOR OCIC EMPLOYEES RETIREMENT PLAN UNITED STATES OMB APPROVAL SECURITIES AND EXCHANGE COMMISSION OMB Number: 3235-0101 Washington, D.C. 20549 Expires: August 1, 2003 Estimated average burden hours per response.. 2.0 FORM 144 NOTICE OF PROPOSED SALE OF SECURITIES SEC USE ONLY PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933 DOCUMENT SEQUENCE NO. ATTENTION: Transmit for filing 3 copies of this form CUSIP NUMBER concurrently with either placing an order with a broker WORK LOCATION to execute sale or executing a sale directly with a market maker. 1(a) NAME OF ISSUER (Please type or print) Ohio Casualty Corporation 1(b) IRS IDENT. NO. (c) S.E.C. FILE NO. 31-0783294 0-5544 1(d) ADDRESS OF ISSUER STREET 9450 Seward Road 1(d) CITY STATE ZIP CODE Fairfield Ohio 45014 1(e) TELEPHONE AREA CODE NUMBER (513) 603-2400 2(a) NAME OF PERSON FOR WHOSE ACCOUNT THE SECURITIES ARE TO BE SOLD LaSalle Bank, N.A., as Directed Trustee of The Ohio Casualty Insurance Company Employees Retirement Plan 2(b) IRS IDENT. NO. (c) RELATIONSHIP TO ISSUER N/A Affiliate 2(d) ADDRESS STREET CITY STATE ZIP CODE 135 South LaSalle Street Chicago Illinois 60603 INSTRUCTION: The person filing this notice should contact the issuer to obtain the I.R.S. Identification Number and the S.E.C. File Number.

INSTRUCTIONS: 1. (a) Name of issuer (b) Issuer's I.R.S. Identification Number (c) Issuer's S.E.C. file number, if any (d) Issuer's address, including zip code (e) Issuer's telephone number, including area code 2. (a) Name of person for whose account the securities are to be sold (b) Such person's I.R.S. identification number, if such person is an entity (c) Such person's relationship to the issuer (e.g., officer, director, 10% stockholder, or member of immediate family of any of the foregoing) (d) Such person's address, including zip code 3. (a) Title of the class of securities to be sold (b) Name and address of each broker through whom the securities are intended to be sold (c) Number of shares or other units to be sold (if debt securities, give the aggregate face amount) (d) Aggregate market value of the securities to be sold as of a specified date within 10 days prior to the filing of this notice (e) Number of shares or other units of the class outstanding, or if debt securities the face amount thereof outstanding, as shown by the most recent report or statement published by the issuer (f) Approximate date on which the securities are to be sold (g) Name of each securities exchange, if any, on which the securities are intended to be sold Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number. TABLE I - SECURITIES TO BE SOLD Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

INSTRUCTIONS: If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid. TABLE II - SECURITIES SOLD DURING THE PAST 3 MONTHS Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

REMARKS: (1) Shares contributed in satisfaction of funding obligations to pension plan. Such obligations were discharged upon receipt of shares by pension plan. The sale is being made pursuant to a trading plan intended to comply with Rule 10b5-1. The trading plan was adopted on February 25, 2003 and the representation below regarding the seller's knowledge of material information speaks as of such date. INSTRUCTIONS: See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice. ATTENTION: The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. LaSalle Bank, N.A., as Directed Trustee May 27, 2003 By: /s/ Michael C. Maratea Vice President -------------------- ----------------------------------------- DATE OF NOTICE (SIGNATURE) The notice shall be signed by the person for whose account the securities are to be sold. At least one copy of the notice shall be manually signed. Any copies not manually signed shall bear typed or printed signatures. ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

OHIO CASUALTY INSURANCE CO EMPLOYEES RETIREMENT PLAN 144