WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.05AR11
Distribution Date: 10/25/2005

Class	Cusip	Orig Prin Bal	Begin Prin Bal	Int Rate Accrued	Int Rate Paid	Int Dist	Prin Dist	Int Shortfall	PPIS	Uncomp Int Shortfall	Prin Loss	Deferred Interest	Int Reimbursed	Unsched Int	Prin Reimbursed	Subsequent Recoveries	Total Dist	Ending Class Bal
A1A	92922F2G2	$1,742,982,000.00	$1,727,697,170.83	4.1500000000%	4.1500000000%	$5,974,952.72	$17,533,726.19	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$23,508,678.91	$1,710,163,444.64
A1B1	92922F2H0	$200,385,000.00	$197,919,627.18	4.1200000000%	4.1200000000%	$679,524.05	$2,828,109.59	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$3,507,633.65	$195,091,517.59
A1B2	92922F2J6	$80,750,000.00	$80,750,000.00	4.2800000000%	4.2800000000%	$288,008.33	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$288,008.33	$80,750,000.00
A1B3	92922F2K3	$445,107,000.00	$441,203,698.38	4.2300000000%	4.2300000000%	$1,555,243.04	$4,477,604.62	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$6,032,847.66	$436,726,093.76
A1C1	92922F2L1	$168,605,000.00	$165,240,908.53	4.0300000000%	4.0300000000%	$554,934.05	$3,859,059.08	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$4,413,993.13	$161,381,849.45
A1C2	92922F2M9	$104,932,000.00	$104,932,000.00	4.2500000000%	4.2500000000%	$371,634.17	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$371,634.17	$104,932,000.00
A1C3	92922F2N7	$110,082,000.00	$110,082,000.00	4.3400000000%	4.3400000000%	$398,129.90	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$398,129.90	$110,082,000.00
A1C4	92922F2P2	$52,127,000.00	$51,669,879.79	4.2700000000%	4.2700000000%	$183,858.66	$524,377.50	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$708,236.16	$51,145,502.29
X	92922F2Q0	$0.00	$0.00	0.0000000000%	0.0000000000%	$1,614,395.70	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$1,614,395.70	$0.00
X_NOTIONAL	XXXXXXXXX	$3,201,069,294.00	$3,175,592,876.13	0.6100513859%	0.6100513859%	$1,614,395.70	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$1,614,395.70	$3,146,332,591.94
X_PRINCIPAL	XXXXXXXXX	$0.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
B1	92922F2R8	$62,421,000.00	$62,420,662.03	4.4400000000%	4.4400000000%	$230,956.45	$7,885.85	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$238,842.30	$62,412,776.18
B2	92922F2S6	$44,815,000.00	$44,814,757.36	4.4600000000%	4.4600000000%	$166,561.51	$5,661.63	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$172,223.14	$44,809,095.73
B3	92922F2T4	$22,407,000.00	$22,406,878.68	4.5100000000%	4.5100000000%	$84,212.52	$2,830.75	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$87,043.27	$22,404,047.93
B4	92922F2U1	$22,407,000.00	$22,406,878.68	4.6800000000%	4.6800000000%	$87,386.83	$2,830.75	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$90,217.58	$22,404,047.93
B5	92922F2V9	$19,206,000.00	$19,205,896.01	4.7800000000%	4.7800000000%	$76,503.49	$2,426.36	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$78,929.84	$19,203,469.65
B6	92922F2W7	$17,606,000.00	$17,605,904.68	4.8321303351%	4.8800000000%	$71,597.35	$2,224.22	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$73,821.57	$17,603,680.46
B7	92922F2X5	$11,204,000.00	$11,203,939.34	4.8321303351%	5.0300000000%	$46,963.18	$1,415.44	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$48,378.62	$11,202,523.90
B8	92922F2Y3	$9,603,000.00	$9,602,948.01	4.8321303351%	5.0300000000%	$40,252.36	$1,213.18	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$41,465.54	$9,601,734.83
B9	92922F2Z0	$12,804,000.00	$12,803,930.68	4.8321303351%	5.0300000000%	$53,669.81	$1,617.57	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$55,287.38	$12,802,313.11
B10	92922F3B2	$12,804,000.00	$12,803,930.68	4.8321303351%	5.0300000000%	$53,669.81	$1,617.57	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$55,287.38	$12,802,313.11
B11	92922F3C0	$8,003,000.00	$8,002,956.67	4.8321303351%	5.0300000000%	$33,545.73	$1,011.05	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$34,556.77	$8,001,945.62
B12	92922F3D8	$32,011,000.00	$32,010,826.68	4.8321303351%	5.0300000000%	$134,178.72	$4,044.06	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$138,222.77	$32,006,782.62
B13	92922F3E6	$20,808,194.58	$20,808,081.92	4.8321303351%	5.0300000000%	$87,220.54	$2,628.77	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$89,849.31	$20,805,453.15
PPP	92922F3Z9	$0.00	$0.00	0.0000000000%	0.0000000000%	$252,412.82	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$252,412.82	$0.00
R	92922F3A4	$100.00	$0.00	0.0000000000%	0.0000000000%	$0.36	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.36	$0.00
R_SYN	XXXXXXXXX	$0.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
YIELD_PAYMENTS	XXXXXXXXX	$0.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
TFEE	XXXXXXXXX	$0.00	$0.00	0.0000000000%	0.0000000000%	$635.12	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$635.12	$0.00
Total		$3,201,069,294.58	$3,175,592,876.13			$13,039,812.07	$29,260,284.19	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$42,300,096.26	$3,146,332,591.94

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.05AR11
Distribution Date: 10/25/2005

Class	Orig Face	Beg Bal	Prin Loss	Prin Reimbursed	Subsequent Recoveries	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
A1A	$1,742,982,000.00	$1,727,697,170.83	$0.00	$0.00	$0.00	$0.00	$17,533,726.19	0.9811710302	$1,710,163,444.64
A1B1	$200,385,000.00	$197,919,627.18	$0.00	$0.00	$0.00	$0.00	$2,828,109.59	0.9735834398	$195,091,517.59
A1B2	$80,750,000.00	$80,750,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	1.0000000000	$80,750,000.00
A1B3	$445,107,000.00	$441,203,698.38	$0.00	$0.00	$0.00	$0.00	$4,477,604.62	0.9811710302	$436,726,093.76
A1C1	$168,605,000.00	$165,240,908.53	$0.00	$0.00	$0.00	$0.00	$3,859,059.08	0.9571593336	$161,381,849.45
A1C2	$104,932,000.00	$104,932,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	1.0000000000	$104,932,000.00
A1C3	$110,082,000.00	$110,082,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	1.0000000000	$110,082,000.00
A1C4	$52,127,000.00	$51,669,879.79	$0.00	$0.00	$0.00	$0.00	$524,377.50	0.9811710302	$51,145,502.29
X	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
X_NOTIONAL	$3,201,069,294.00	$3,175,592,876.13	$0.00	$0.00	$0.00	$0.00	$0.00	0.9829004945	$3,146,332,591.94
X_PRINCIPAL	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
B1	$62,421,000.00	$62,420,662.03	$0.00	$0.00	$0.00	$0.00	$7,885.85	0.9998682524	$62,412,776.18
B2	$44,815,000.00	$44,814,757.36	$0.00	$0.00	$0.00	$0.00	$5,661.63	0.9998682524	$44,809,095.73
B3	$22,407,000.00	$22,406,878.68	$0.00	$0.00	$0.00	$0.00	$2,830.75	0.9998682523	$22,404,047.93
B4	$22,407,000.00	$22,406,878.68	$0.00	$0.00	$0.00	$0.00	$2,830.75	0.9998682523	$22,404,047.93
B5	$19,206,000.00	$19,205,896.01	$0.00	$0.00	$0.00	$0.00	$2,426.36	0.9998682521	$19,203,469.65
B6	$17,606,000.00	$17,605,904.68	$0.00	$0.00	$0.00	$0.00	$2,224.22	0.9998682529	$17,603,680.46
B7	$11,204,000.00	$11,203,939.34	$0.00	$0.00	$0.00	$0.00	$1,415.44	0.9998682524	$11,202,523.90
B8	$9,603,000.00	$9,602,948.01	$0.00	$0.00	$0.00	$0.00	$1,213.18	0.9998682526	$9,601,734.83
B9	$12,804,000.00	$12,803,930.68	$0.00	$0.00	$0.00	$0.00	$1,617.57	0.9998682529	$12,802,313.11
B10	$12,804,000.00	$12,803,930.68	$0.00	$0.00	$0.00	$0.00	$1,617.57	0.9998682529	$12,802,313.11
B11	$8,003,000.00	$8,002,956.67	$0.00	$0.00	$0.00	$0.00	$1,011.05	0.9998682519	$8,001,945.62
B12	$32,011,000.00	$32,010,826.68	$0.00	$0.00	$0.00	$0.00	$4,044.06	0.9998682522	$32,006,782.62
B13	$20,808,194.58	$20,808,081.92	$0.00	$0.00	$0.00	$0.00	$2,628.77	0.9998682524	$20,805,453.15
PPP	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
R	$100.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
R_SYN	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
YIELD_PAYMENTS	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
TFEE	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
Total	$3,201,069,294.58	$3,175,592,876.13	$0.00	$0.00	$0.00	$0.00	$29,260,284.19	0.9829004943	$3,146,332,591.94

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.05AR11
Distribution Date: 10/25/2005
PER $1000 DENOMINATION
Class	Orig Face	Beg Bal	Prin Loss	Prin Reimbursed	Subsequent Recoveries	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
A1A	$1,742,982,000.00	991.23064428	0.00000000	0.00000000	0.00000000	0.00000000	10.05961404	0.9811710302	981.17103025
A1B1	$200,385,000.00	987.69681952	0.00000000	0.00000000	0.00000000	0.00000000	14.11337969	0.9735834398	973.58343983
A1B2	$80,750,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	1.0000000000	1,000.00000000
A1B3	$445,107,000.00	991.23064427	0.00000000	0.00000000	0.00000000	0.00000000	10.05961403	0.9811710302	981.17103025
A1C1	$168,605,000.00	980.04749877	0.00000000	0.00000000	0.00000000	0.00000000	22.88816512	0.9571593336	957.15933365
A1C2	$104,932,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	1.0000000000	1,000.00000000
A1C3	$110,082,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	1.0000000000	1,000.00000000
A1C4	$52,127,000.00	991.23064420	0.00000000	0.00000000	0.00000000	0.00000000	10.05961402	0.9811710302	981.17103018
X	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
X_NOTIONAL	$3,201,069,294.00	992.04127886	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.9829004945	982.90049448
X_PRINCIPAL	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
B1	$62,421,000.00	999.99458564	0.00000000	0.00000000	0.00000000	0.00000000	0.12633329	0.9998682524	999.86825235
B2	$44,815,000.00	999.99458574	0.00000000	0.00000000	0.00000000	0.00000000	0.12633337	0.9998682524	999.86825237
B3	$22,407,000.00	999.99458562	0.00000000	0.00000000	0.00000000	0.00000000	0.12633329	0.9998682523	999.86825233
B4	$22,407,000.00	999.99458562	0.00000000	0.00000000	0.00000000	0.00000000	0.12633329	0.9998682523	999.86825233
B5	$19,206,000.00	999.99458555	0.00000000	0.00000000	0.00000000	0.00000000	0.12633344	0.9998682521	999.86825211
B6	$17,606,000.00	999.99458594	0.00000000	0.00000000	0.00000000	0.00000000	0.12633307	0.9998682529	999.86825287
B7	$11,204,000.00	999.99458586	0.00000000	0.00000000	0.00000000	0.00000000	0.12633345	0.9998682524	999.86825241
B8	$9,603,000.00	999.99458607	0.00000000	0.00000000	0.00000000	0.00000000	0.12633344	0.9998682526	999.86825263
B9	$12,804,000.00	999.99458607	0.00000000	0.00000000	0.00000000	0.00000000	0.12633318	0.9998682529	999.86825289
B10	$12,804,000.00	999.99458607	0.00000000	0.00000000	0.00000000	0.00000000	0.12633318	0.9998682529	999.86825289
B11	$8,003,000.00	999.99458578	0.00000000	0.00000000	0.00000000	0.00000000	0.12633387	0.9998682519	999.86825191
B12	$32,011,000.00	999.99458561	0.00000000	0.00000000	0.00000000	0.00000000	0.12633345	0.9998682522	999.86825216
B13	$20,808,194.58	999.99458579	0.00000000	0.00000000	0.00000000	0.00000000	0.12633340	0.9998682524	999.86825239
PPP	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
R	$100.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
R_SYN	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
YIELD_PAYMENTS	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
TFEE	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.05AR11
Distribution Date: 10/25/2005

Class	Orig Face	Int Rate Accrued	Int Rate Paid	Beg Cert Prin/Not Bal	Current Int Accrued	Int Shortfall	PPIS	Uncompensated Int Shortfall	Unscheduled Int	Int Reimbursed	Total Int Dist
A1A	$1,742,982,000.00	4.1500000000%	4.1500000000%	$1,727,697,170.83	$5,974,952.72	$0.00	$0.00	$0.00	$0.00	$0.00	$5,974,952.72
A1B1	$200,385,000.00	4.1200000000%	4.1200000000%	$197,919,627.18	$679,524.05	$0.00	$0.00	$0.00	$0.00	$0.00	$679,524.05
A1B2	$80,750,000.00	4.2800000000%	4.2800000000%	$80,750,000.00	$288,008.33	$0.00	$0.00	$0.00	$0.00	$0.00	$288,008.33
A1B3	$445,107,000.00	4.2300000000%	4.2300000000%	$441,203,698.38	$1,555,243.04	$0.00	$0.00	$0.00	$0.00	$0.00	$1,555,243.04
A1C1	$168,605,000.00	4.0300000000%	4.0300000000%	$165,240,908.53	$554,934.05	$0.00	$0.00	$0.00	$0.00	$0.00	$554,934.05
A1C2	$104,932,000.00	4.2500000000%	4.2500000000%	$104,932,000.00	$371,634.17	$0.00	$0.00	$0.00	$0.00	$0.00	$371,634.17
A1C3	$110,082,000.00	4.3400000000%	4.3400000000%	$110,082,000.00	$398,129.90	$0.00	$0.00	$0.00	$0.00	$0.00	$398,129.90
A1C4	$52,127,000.00	4.2700000000%	4.2700000000%	$51,669,879.79	$183,858.66	$0.00	$0.00	$0.00	$0.00	$0.00	$183,858.66
X	$0.00	0.0000000000%	0.0000000000%	$0.00	$1,614,395.70	$0.00	$0.00	$0.00	$0.00	$0.00	$1,614,395.70
X_NOTIONAL	$3,201,069,294.00	0.6100513859%	0.6100513859%	$3,175,592,876.13	$1,614,395.70	$0.00	$0.00	$0.00	$0.00	$0.00	$1,614,395.70
X_PRINCIPAL	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
B1	$62,421,000.00	4.4400000000%	4.4400000000%	$62,420,662.03	$230,956.45	$0.00	$0.00	$0.00	$0.00	$0.00	$230,956.45
B2	$44,815,000.00	4.4600000000%	4.4600000000%	$44,814,757.36	$166,561.51	$0.00	$0.00	$0.00	$0.00	$0.00	$166,561.51
B3	$22,407,000.00	4.5100000000%	4.5100000000%	$22,406,878.68	$84,212.52	$0.00	$0.00	$0.00	$0.00	$0.00	$84,212.52
B4	$22,407,000.00	4.6800000000%	4.6800000000%	$22,406,878.68	$87,386.83	$0.00	$0.00	$0.00	$0.00	$0.00	$87,386.83
B5	$19,206,000.00	4.7800000000%	4.7800000000%	$19,205,896.01	$76,503.49	$0.00	$0.00	$0.00	$0.00	$0.00	$76,503.49
B6	$17,606,000.00	4.8321303351%	4.8800000000%	$17,605,904.68	$71,597.35	$0.00	$0.00	$0.00	$0.00	$0.00	$71,597.35
B7	$11,204,000.00	4.8321303351%	5.0300000000%	$11,203,939.34	$46,963.18	$0.00	$0.00	$0.00	$0.00	$0.00	$46,963.18
B8	$9,603,000.00	4.8321303351%	5.0300000000%	$9,602,948.01	$40,252.36	$0.00	$0.00	$0.00	$0.00	$0.00	$40,252.36
B9	$12,804,000.00	4.8321303351%	5.0300000000%	$12,803,930.68	$53,669.81	$0.00	$0.00	$0.00	$0.00	$0.00	$53,669.81
B10	$12,804,000.00	4.8321303351%	5.0300000000%	$12,803,930.68	$53,669.81	$0.00	$0.00	$0.00	$0.00	$0.00	$53,669.81
B11	$8,003,000.00	4.8321303351%	5.0300000000%	$8,002,956.67	$33,545.73	$0.00	$0.00	$0.00	$0.00	$0.00	$33,545.73
B12	$32,011,000.00	4.8321303351%	5.0300000000%	$32,010,826.68	$134,178.72	$0.00	$0.00	$0.00	$0.00	$0.00	$134,178.72
B13	$20,808,194.58	4.8321303351%	5.0300000000%	$20,808,081.92	$87,220.54	$0.00	$0.00	$0.00	$0.00	$0.00	$87,220.54
PPP	$0.00	0.0000000000%	0.0000000000%	$0.00	$252,412.82	$0.00	$0.00	$0.00	$0.00	$0.00	$252,412.82
R	$100.00	0.0000000000%	0.0000000000%	$0.00	$0.36	$0.00	$0.00	$0.00	$0.00	$0.00	$0.36
R_SYN	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
YIELD_PAYMENTS	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
TFEE	$0.00	0.0000000000%	0.0000000000%	$0.00	$635.12	$0.00	$0.00	$0.00	$0.00	$0.00	$635.12
Total	$3,201,069,294.58			$3,175,592,876.13	$13,039,812.07	$0.00	$0.00	$0.00	$0.00	$0.00	$13,039,812.07

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.05AR11
Distribution Date: 10/25/2005
PER $1000 DENOMINATION
Class	Orig Face	Int Rate Accrued	Int Rate Paid	Beg Cert Prin/Not Bal	Curent Int Accrued	Int Shortfall	PPIS	Uncompensated Int Shortfall	Unscheduled Int	Int Reimbursed	Total Int Dist
A1A	$1,742,982,000.00	4.1500000000%	4.1500000000%	991.23064428	3.42800598	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.42800598
A1B1	$200,385,000.00	4.1200000000%	4.1200000000%	987.69681952	3.39109240	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.39109240
A1B2	$80,750,000.00	4.2800000000%	4.2800000000%	1,000.00000000	3.56666663	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.56666663
A1B3	$445,107,000.00	4.2300000000%	4.2300000000%	991.23064427	3.49408803	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.49408803
A1C1	$168,605,000.00	4.0300000000%	4.0300000000%	980.04749877	3.29132618	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.29132618
A1C2	$104,932,000.00	4.2500000000%	4.2500000000%	1,000.00000000	3.54166670	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.54166670
A1C3	$110,082,000.00	4.3400000000%	4.3400000000%	1,000.00000000	3.61666667	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.61666667
A1C4	$52,127,000.00	4.2700000000%	4.2700000000%	991.23064420	3.52712913	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.52712913
X	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
X_NOTIONAL	$3,201,069,294.00	0.6100513859%	0.6100513859%	992.04127886	0.50433013	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.50433013
X_PRINCIPAL	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
B1	$62,421,000.00	4.4400000000%	4.4400000000%	999.99458564	3.69997997	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.69997997
B2	$44,815,000.00	4.4600000000%	4.4600000000%	999.99458574	3.71664644	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.71664644
B3	$22,407,000.00	4.5100000000%	4.5100000000%	999.99458562	3.75831303	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.75831303
B4	$22,407,000.00	4.6800000000%	4.6800000000%	999.99458562	3.89997902	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.89997902
B5	$19,206,000.00	4.7800000000%	4.7800000000%	999.99458555	3.98331199	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.98331199
B6	$17,606,000.00	4.8321303351%	4.8800000000%	999.99458594	4.06664489	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.06664489
B7	$11,204,000.00	4.8321303351%	5.0300000000%	999.99458586	4.19164406	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.19164406
B8	$9,603,000.00	4.8321303351%	5.0300000000%	999.99458607	4.19164428	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.19164428
B9	$12,804,000.00	4.8321303351%	5.0300000000%	999.99458607	4.19164402	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.19164402
B10	$12,804,000.00	4.8321303351%	5.0300000000%	999.99458607	4.19164402	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.19164402
B11	$8,003,000.00	4.8321303351%	5.0300000000%	999.99458578	4.19164438	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.19164438
B12	$32,011,000.00	4.8321303351%	5.0300000000%	999.99458561	4.19164412	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.19164412
B13	$20,808,194.58	4.8321303351%	5.0300000000%	999.99458579	4.19164381	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.19164381
PPP	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
R	$100.00	0.0000000000%	0.0000000000%	0.00000000	3.60000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.60000000
R_SYN	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
YIELD_PAYMENTS	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
TFEE	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
10/2005 DISTRIBUTION REPORT
SERIES: WAMU 05AR11
WEIGHTED AVERAGE PC RATE: 4.83213%
WEIGHTED AVERAGE MATURITY: 363.07453
WEIGHTED AVERAGE LOAN AGE: 5.21897
POOL NUMBER: 2794
ISSUE DATE: 08/25/2005
CERTIFICATE BALANCE AT ISSUE: $3,201,069,294.58
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	5038		$3,175,592,876.13
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		($2,816,144.51)
Unscheduled Principal Collection/Reversals		$3,893,670.82
Liquidations-in-full	42	$28,182,757.88
Subsequent Recoveries		$0.00
Net principal Distributed		$29,260,284.19	-$29,260,284.19

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	4996		$3,146,332,591.94

SCHEDULED INTEREST AT MORTGAGE RATE:		$13,779,771.22

UNSCHEDULED INTEREST AT MORTGAGE RATE:
Unscheduled Interest Collection/Reversals		$0.00
Interest Uncollected on Liquidation		$0.00
Interest Uncollected on Non-Earning Assets		$0.00
Interest Uncollected on Prepayment		$0.00
Uncompensated Uncollected Interest		$0.00
Net Unscheduled Interest Distributed		$0.00

OTHER:
Loan Conversion Fees		$0.00
Expense Reimbursements		$0.00
Gain on Liquidations		$0.00
Hazard Insurance Premium Refunds		$0.00
Recoveries Carried Forward		$0.00
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
10/2005 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$992,371.97

UNSCHEDULED SERVICING FEES:
Unscheduled Service Fee Collections/Reversals		$0.00
Servicing Fees Uncollected on Liquidation		$0.00
Servicing Fees Uncollected/Non-Earning Assets		$0.00
Net Unscheduled Service Fees Distributed		$0.00

MISCELLANEOUS EXPENSES:		$0.00

NET FUNDS DISTRIBUTED:		$42,047,683.44

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
10/2005 DISTRIBUTION REPORT
SERIES: WAMU 05AR11
WEIGHTED AVERAGE PC RATE: 4.83213%
WEIGHTED AVERAGE MATURITY: 363.07453
WEIGHTED AVERAGE LOAN AGE: 5.21897
POOL NUMBER: ALL
ISSUE DATE: 08/25/2005
CERTIFICATE BALANCE AT ISSUE: $3,201,069,294.58
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	5038		$3,175,592,876.13
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		($2,816,144.51)
Unscheduled Principal Collection/Reversals		$3,893,670.82
Liquidations-in-full	42	$28,182,757.88
Subsequent Recoveries		$0.00
Net principal Distributed		$29,260,284.19	-$29,260,284.19

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	4996		$3,146,332,591.94

SCHEDULED INTEREST AT MORTGAGE RATE:		$13,779,771.22

UNSCHEDULED INTEREST AT MORTGAGE RATE:
Unscheduled Interest Collection/Reversals		$0.00
Interest Uncollected on Liquidation		$0.00
Interest Uncollected on Non-Earning Assets		$0.00
Interest Uncollected on Prepayment		$0.00
Uncompensated Uncollected Interest		$0.00
Net Unscheduled Interest Distributed		$0.00

OTHER:
Loan Conversion Fees		$0.00
Expense Reimbursements		$0.00
Gain on Liquidations		$0.00
Hazard Insurance Premium Refunds		$0.00
Recoveries Carried Forward		$0.00
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
10/2005 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$992,371.97

UNSCHEDULED SERVICING FEES:
Unscheduled Service Fee Collections/Reversals		$0.00
Servicing Fees Uncollected on Liquidation		$0.00
Servicing Fees Uncollected/Non-Earning Assets		$0.00
Net Unscheduled Service Fees Distributed		$0.00

MISCELLANEOUS EXPENSES:		$0.00

NET FUNDS DISTRIBUTED:		$42,047,683.44

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.05AR11
Distribution Date: 10/25/2005

Distribution by Group
Pool ID		Principal		Interest		Total
Pool - 2794		$29,260,284.19		$12,787,399.25		$42,047,683.44
Aggregate		$29,260,284.19		$12,787,399.25		$42,047,683.44

Number of Loans and Aggregate Principal Balance By Group
Pool ID	Beg Bal	Beg Count	Paid Off / Liq Count	Rem Count	Sched Prin End Bal	Sched Prin	Prin PrePay / Liq	Unsched Prin / Rev	Total Prin
Pool - 2794	$3,175,592,876.13	5038	42	4996	$3,146,332,591.94	($2,816,144.51)	$28,182,757.88	$3,893,670.82	$29,260,284.19
Aggregate	$3,175,592,876.13	5038	42	4996	$3,146,332,591.94	($2,816,144.51)	$28,182,757.88	$3,893,670.82	$29,260,284.19

Delinquency Information by Group
Pool ID	1 Month Count	Sched End Balance	2 Months Count	Sched End Balance	3 Months Count	Sched End Balance	4 Months Count	Sched End Balance
Pool - 2794	26	$14,961,904.05	0	$0.00	0	$0.00	0	$0.00
Aggregate	26	$14,961,904.05	0	$0.00	0	$0.00	0	$0.00

Foreclosure and REO Information by Group
Pool ID		Foreclosure Count		Sched End Balance		REO Count		Sched End Balance
Pool - 2794		0		$0.00		0		$0.00
Aggregate		0		$0.00		0		$0.00

Aggregate Loss Amounts by Group
Pool ID			Count			Loss Amount
Pool - 2794			0			$0.00
Aggregate			0			$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.05AR11
Distribution Date: 10/25/2005

INSURANCE RESERVES - Group 1
Insurance Type	Original Balance	Claims In Progress	Claims Paid	Coverage Adjustments	Coverage Remaining
MPI	$0.00	$0.00	$0.00	$0.00	$0.00
Special Hazard	$0.00	$0.00	$0.00	$0.00	$0.00
Bankruptcy Bond
Single-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Multi-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Mortgage Repurchase	$0.00	$0.00	$0.00	$0.00	$0.00

INSURANCE RESERVES - Aggregate
Insurance Type	Original Balance	Claims In Progress	Claims Paid	Coverage Adjustments	Coverage Remaining
MPI	$0.00	$0.00	$0.00	$0.00	$0.00
Special Hazard	$0.00	$0.00	$0.00	$0.00	$0.00
Bankruptcy Bond
Single-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Multi-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Mortgage Repurchase	$0.00	$0.00	$0.00	$0.00	$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.05AR11
Distribution Date: 10/25/2005

The Subordinate Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, to the Senior Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated August 23, 2005 to that certain Prospectus Supplement, dated August 23, 2005, to which certain Senior Certificates were offered.



The Class Principal Balances of each Class of the Class B1,B2,B3,B4,B5,B6,B7,B8,B9,B10,B11,B12 Certificatesimmediately after the principal and interest distribution on 200510 are as follows:

Class			Class Principal Balance
B1			$62,412,776.18
B2			$44,809,095.73
B3			$22,404,047.93
B4			$22,404,047.93
B5			$19,203,469.65
B6			$17,603,680.46
B7			$11,202,523.90
B8			$9,601,734.83
B9			$12,802,313.11
B10			$12,802,313.11
B11			$8,001,945.62
B12			$32,006,782.62
Total			$275,254,731.07
Capitalized items used but not defined herein have the meanings ascribed to them in the Prospectus Supplement.

WaMu Mortgage Pass-Through Certificates, Series 2005-AR11 8-K/A