			MASTR Asset Backed Securities Trust 2005-WMC1					Contact:
			Mortgage Pass Through Certificates, Series 2005-WMC1					Brian Giel
								Account Administrator
								651-495-3844
			STATEMENT TO CERTIFICATEHOLDERS					brian.giel@usbank.com

Distribution Date:

06/27/05

		Original	Beginning				Allocated	Ending
		Certificate	Certificate	Principal	Interest	Total	Realized	Certificate
Class	Cusip	Face Value	Balance	Distribution	Distribution(1)	Distribution	Losses	Balance
A-1	57643LGR1	$273,143,000.00	$264,982,575.77	$11,058,332.27	$796,714.28	$11,855,046.55	$0.00	$253,924,243.50
A-2	57643LGS9	$68,285,000.00	$66,244,916.35	$2,764,552.70	$202,212.61	$2,966,765.31	$0.00	$63,480,363.65
A-3	57643LGT7	$206,386,000.00	$189,693,278.76	$10,704,747.12	$554,694.76	$11,259,441.88	$0.00	$178,988,531.64
A-4	57643LGU4	$151,617,000.00	$151,617,000.00	$0.00	$455,861.78	$455,861.78	$0.00	$151,617,000.00
A-5	57643LGV2	$24,474,000.00	$24,474,000.00	$0.00	$76,052.96	$76,052.96	$0.00	$24,474,000.00
M-1	57643LGW0	$35,035,000.00	$35,035,000.00	$0.00	$112,725.11	$112,725.11	$0.00	$35,035,000.00
M-2	57643LGX8	$26,845,000.00	$26,845,000.00	$0.00	$87,112.03	$87,112.03	$0.00	$26,845,000.00
M-3	57643LGY6	$17,290,000.00	$17,290,000.00	$0.00	$56,581.53	$56,581.53	$0.00	$17,290,000.00
M-4	57643LGZ3	$15,470,000.00	$15,470,000.00	$0.00	$52,752.70	$52,752.70	$0.00	$15,470,000.00
M-5	57643LHA7	$14,105,000.00	$14,105,000.00	$0.00	$48,615.23	$48,615.23	$0.00	$14,105,000.00
M-6	57643LHB5	$13,650,000.00	$13,650,000.00	$0.00	$47,672.63	$47,672.63	$0.00	$13,650,000.00
M-7	57643LHC3	$13,195,000.00	$13,195,000.00	$0.00	$52,252.20	$52,252.20	$0.00	$13,195,000.00
M-8	57643LHD1	$9,555,000.00	$9,555,000.00	$0.00	$39,064.03	$39,064.03	$0.00	$9,555,000.00
M-9	57643LHE9	$9,100,000.00	$9,100,000.00	$0.00	$41,458.08	$41,458.08	$0.00	$9,100,000.00
M-10	57643LHF6	$8,645,000.00	$8,645,000.00	$0.00	$52,223.00	$52,223.00	$0.00	$8,645,000.00
M-11	57643LHG4	$11,375,000.00	$11,375,000.00	$0.00	$68,714.48	$68,714.48	$0.00	$11,375,000.00
M-12	57643LHH2	$5,460,000.00	$5,460,000.00	$0.00	$27,977.95	$27,977.95	$0.00	$5,460,000.00
CE	NA	$6,370,041.46	$6,370,041.46	$0.00	$1,939,001.53	$1,939,001.53	$0.00	$6,370,041.46
P	NA	$100.00	$100.00	$0.00	$335,398.27	$335,398.27	$0.00	$100.00
R	NA	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
Total		$910,000,141.46	$883,106,912.34	$24,527,632.09	$5,047,085.16	$29,574,717.25	$0.00	$858,579,280.25

AMOUNTS PER $1,000 UNIT						PASS THROUGH RATES
					Ending	Original	Current	Next
	Principal	Interest	Total	Realized	Certificate	Pass-Through	Pass-Through	Pass-Through
Class	Distribution	Distribution	Distribution	Losses	Balance	Interest Rate	Interest Rate	Interest Rate*
A-1	40.48550492	2.91683946	43.40234438	0.00000000	929.63848058	3.25438%	3.28000%	3.50438%
A-2	40.48550487	2.96130351	43.44680838	0.00000000	929.63848063	3.30438%	3.33000%	3.55438%
A-3	51.86760304	2.68765691	54.55525995	0.00000000	867.25132344	3.16438%	3.19000%	3.41438%
A-4	0.00000000	3.00666667	3.00666667	0.00000000	1000.00000000	3.25438%	3.28000%	3.50438%
A-5	0.00000000	3.10750020	3.10750020	0.00000000	1000.00000000	3.36438%	3.39000%	3.61438%
M-1	0.00000000	3.21749993	3.21749993	0.00000000	1000.00000000	3.48438%	3.51000%	3.73438%
M-2	0.00000000	3.24500019	3.24500019	0.00000000	1000.00000000	3.51438%	3.54000%	3.76438%
M-3	0.00000000	3.27250029	3.27250029	0.00000000	1000.00000000	3.54438%	3.57000%	3.79438%
M-4	0.00000000	3.41000000	3.41000000	0.00000000	1000.00000000	3.69438%	3.72000%	3.94438%
M-5	0.00000000	3.44666643	3.44666643	0.00000000	1000.00000000	3.73438%	3.76000%	3.98438%
M-6	0.00000000	3.49250037	3.49250037	0.00000000	1000.00000000	3.78438%	3.81000%	4.03438%
M-7	0.00000000	3.96000000	3.96000000	0.00000000	1000.00000000	4.29438%	4.32000%	4.54438%
M-8	0.00000000	4.08833386	4.08833386	0.00000000	1000.00000000	4.43438%	4.46000%	4.68438%
M-9	0.00000000	4.55583297	4.55583297	0.00000000	1000.00000000	4.94438%	4.97000%	5.19438%
M-10	0.00000000	6.04083285	6.04083285	0.00000000	1000.00000000	6.56438%	5.82201%	6.81438%
M-11	0.00000000	6.04083341	6.04083341	0.00000000	1000.00000000	6.56438%	5.82201%	6.81438%
M-12	0.00000000	5.12416667	5.12416667	0.00000000	1000.00000000	5.56438%	5.59000%	5.81438%
CE	0.00000000	304.39386340	304.39386340	0.00000000	1000.00000000	3.46885%	2.63479%
P	0.00000000	3353982.7000	3353982.7000	0.00000000	1000.00000000
R	0.00000000	0.0000000	0.0000000	0.00000000	0.00000000
								* Estimated

(1) - The Class P Certificates do not accrue interest. Amounts appearing as Interest Distributions represent payments of Prepayment Charges.

Page 1

			MASTR Asset Backed Securities Trust 2005-WMC1					Contact:
			Mortgage Pass Through Certificates, Series 2005-WMC1					Brian Giel
								Account Administrator
								651-495-3844
			STATEMENT TO CERTIFICATEHOLDERS					brian.giel@usbank.com

Distribution Date:

06/27/05

Section 4.02 (ii), (xv) - INTEREST

		Monthly		Remaining	Reduction from the Allocation of:
	Interest	Interest	Interest	Unpaid		Prepayment	Relief Act
	Distribution	Distributable	Shortfall	Interest	Realized	Interest	Interest
Class	Amount	Amount	Amount	Amount	Losses	Shortfalls	Shortfalls
A-1	$796,714.28	$796,714.28	$0.00	$0.00	$0.00	$0.00	$0.00
A-2	$202,212.61	$202,212.61	$0.00	$0.00	$0.00	$0.00	$0.00
A-3	$554,694.76	$554,694.76	$0.00	$0.00	$0.00	$0.00	$0.00
A-4	$455,861.78	$455,861.78	$0.00	$0.00	$0.00	$0.00	$0.00
A-5	$76,052.96	$76,052.96	$0.00	$0.00	$0.00	$0.00	$0.00
M-1	$112,725.11	$112,725.11	$0.00	$0.00	$0.00	$0.00	$0.00
M-2	$87,112.03	$87,112.03	$0.00	$0.00	$0.00	$0.00	$0.00
M-3	$56,581.53	$56,581.53	$0.00	$0.00	$0.00	$0.00	$0.00
M-4	$52,752.70	$52,752.70	$0.00	$0.00	$0.00	$0.00	$0.00
M-5	$48,615.23	$48,615.23	$0.00	$0.00	$0.00	$0.00	$0.00
M-6	$47,672.63	$47,672.63	$0.00	$0.00	$0.00	$0.00	$0.00
M-7	$52,252.20	$52,252.20	$0.00	$0.00	$0.00	$0.00	$0.00
M-8	$39,064.03	$39,064.03	$0.00	$0.00	$0.00	$0.00	$0.00
M-9	$41,458.08	$41,458.08	$0.00	$0.00	$0.00	$0.00	$0.00
M-10	$52,223.00	$46,137.01	$0.00	$0.00	$0.00	$0.00	$0.00
M-11	$68,714.48	$60,706.60	$0.00	$0.00	$0.00	$0.00	$0.00
M-12	$27,977.95	$27,977.95	$0.00	$0.00	$0.00	$0.00	$0.00
CE	$1,939,001.53	$1,953,095.40	$0.00	$0.00	$0.00	$0.00	$263.10
P	$335,398.27	N/A	N/A	N/A	$0.00	$0.00	$0.00
Total	$5,047,085.16	$4,711,686.89	$0.00	$0.00	$0.00	$0.00	$263.10

Section 4.02 (xvi), (xvii)
PPIS & RAIS	Prepayment Interest Shortfalls not covered by the servicer pursuant to Section 3.24	$0.00
	Relief Act Interest Shortfalls	$263.10

Section 4.02 (xviii)
	Overcollateralized Amount	$6,370,041.46
	Overcollateralization Release Amount	$0.00
	Overcollateralization Deficiency (after all payments)	$0.00
	Overcollateralization Target Amount	$6,370,041.46
	Monthly Excess Cash Flow	$1,953,095.40

Credit Enhancement Percentage

21.073%

Section 4.02 (v), (vi)
POOL	Stated Principal Balance of Mortgage Loans and REO Properties	$858,579,280.25
	Stated Principal Balance of Mortgage Loans	$858,579,280.25
	Number of Mortgage Loans	4,622

Section 4.02 (vi)
WAC & WAM	Weighted Average Remaining Term to Maturity	337
	Weighted Average Mortgage Interest Rate	6.9354%

Section 4.02 (iv)
P&I ADVANCES		Aggregate Advances for the Collection Period						$1,459,606.50

Section 4.02 (vii)
DELINQUENCIES
				Stated Principal	Stated Principal
		Number	Number as %	Balance	Balance as %
	30-59 days delinquent	74	1.60104%	$15,100,913.83	1.75883%
	60-89 days delinquent	31	0.67071%	$6,852,168.18	0.79808%
	90 or more days delinquent	5	0.10818%	$1,378,213.27	0.16052%
	Foreclosures	0	0.00000%	$0.00	0.00000%
	Bankruptcies	4	0.08654%	$434,052.72	0.05055%

Page 2

			MASTR Asset Backed Securities Trust 2005-WMC1					Contact:
			Mortgage Pass Through Certificates, Series 2005-WMC1					Brian Giel
								Account Administrator
								651-495-3844
			STATEMENT TO CERTIFICATEHOLDERS					brian.giel@usbank.com

Distribution Date:

06/27/05

Section 4.02 (viii)
REO	Number of REO Loans	0
	Number of REO Loans as %	0.00000%
	Stated Principal Balance of REO Properties	$0.00
	Stated Principal Balance of REO Properties as %	0.00000%
	Total Book Value of REO Properties:	$0.00

Section 4.02 (xxi)
	Stepdown Date Occurrence	NO
	Trigger Event Occurrence	NO
	Realized Loss as a Percentage of the Original Pool Balance	0.00000%

Section 4.02 (iii), (xii)
FEES	Trustee Fee	$11,774.76
	Servicing Fee (and any additional Servicer compensation)	$367,884.61
	Credit Risk Manager Fee	$11,038.84
	Extraordinary Trust Fund Expenses	$0.00

Section 4.02 (x), (xxii)
AVAILABLE FUNDS	Principal:
	Scheduled Principal	$554,784.95
	Principal Prepayments (includes curtailments)	$23,972,847.14
	Liquidation Proceeds	$0.00
	Total Principal	$24,527,632.09

Net Interest (net of servicing, trustee & Credit Risk Manager fee)

$4,711,686.89

Available Funds (total principal plus net interest)

$29,239,318.98

Section 4.02 (i)
PREPAYMENT
PENALTIES	Prepayment Charges allocated to Class P	335,398.27
	Servicer Prepayment Charge Payment Amounts allocated to Class P	$0.00

Section 4.02 (xi)
LOSSES	Current Realized Losses	$0.00
	Aggregate Realized Losses since Closing	$0.00

		Subsequent Recoveries						$0.00
		Aggregate Subsequent Recoveries since Closing						$0.00

Section 4.02 (xx)
		Aggregate Loss Severity Percentage						0.00000%

Page 3

			MASTR Asset Backed Securities Trust 2005-WMC1					Contact:
			Mortgage Pass Through Certificates, Series 2005-WMC1					Brian Giel
								Account Administrator
								651-495-3844
			STATEMENT TO CERTIFICATEHOLDERS					brian.giel@usbank.com

Distribution Date:

06/27/05

Section 4.02 (xxiii) - NET WAC RATE CARRYOVER AMOUNTS

	Net WAC Rate	Amounts	Amounts
Class	Carryover Amount	Paid	Unpaid
A-1	$0.00	$0.00	$0.00
A-2	$0.00	$0.00	$0.00
A-3	$0.00	$0.00	$0.00
A-4	$0.00	$0.00	$0.00
A-5	$0.00	$0.00	$0.00
M-1	$0.00	$0.00	$0.00
M-2	$0.00	$0.00	$0.00
M-3	$0.00	$0.00	$0.00
M-4	$0.00	$0.00	$0.00
M-5	$0.00	$0.00	$0.00
M-6	$0.00	$0.00	$0.00
M-7	$0.00	$0.00	$0.00
M-8	$0.00	$0.00	$0.00
M-9	$0.00	$0.00	$0.00
M-10	$6,085.99	$6,085.99	$0.00
M-11	$8,007.88	$8,007.88	$0.00
M-12	$0.00	$0.00	$0.00

Section 4.02 (xxiv) - PAYMENTS MADE UNDER CAP CONTRACTS
	Group 1 Cap Contract	0.00
	Group 2 Cap Contract	0.00
	Mezzanine Contract	0.00

Section 4.02 (xiv) - ENDING BALANCE FACTORS

			Class	Factor
			A-1	0.929638
			A-2	0.929638
			A-3	0.867251
			A-4	1.000000
			A-5	1.000000
			M-1	1.000000
			M-2	1.000000
			M-3	1.000000
			M-4	1.000000
			M-5	1.000000
			M-6	1.000000
			M-7	1.000000
			M-8	1.000000
			M-9	1.000000
			M-10	1.000000
			M-11	1.000000
			M-12	1.000000
			CE	0.943494
			P	1.000000

Page 4

MASTR ASSET BACKED SECURITIES TRUST 2005 WMC1 8-K