Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Summary Collateral Information
	Description
Group 1
Pool 2916	MTA
Pool 2917	MTA

General Information
Description	Total	Pool 2916	Pool 2917	Group 1
Weighted Average Pass Through Rate	3.87627%	3.65364%	5.84887%	3.87627%
Weighted Average Mortgage Interest Rate	5.25473%	5.14536%	6.22387%	5.25473%
Weighted Average Remaining Term (in Months)	375.42534	376.17549	368.87133	375.42534
Weighted Average Loan Age (in Months)	10.34722	10.69276	7.32826	10.34722
Average Ending Scheduled Principal Balance	$574,990.47	$604,919.87	$401,451.33	$574,990.47
Remaining Loan Count	1584	1351	233	1584
Ending Scheduled Principal Balance	$910,784,907.22	$817,246,747.17	$93,538,160.05	$910,784,907.22

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Geographic Distribution
Total			Pool 2916			Pool 2917
State	Percent	Ending Scheduled Principal Balance	State	Percent	Ending Scheduled Principal Balance	State	Percent	Ending Scheduled Principal Balance
CA	$644,677,138.85	70.78%	CA	$589,327,537.14	72.11%	CA	$55,349,601.71	59.17%
FL	$50,543,032.77	5.55%	FL	$46,412,404.26	5.68%	MA	$8,679,871.77	9.28%
NY	$38,913,749.03	4.27%	NY	$35,864,513.69	4.39%	NJ	$4,582,083.86	4.90%
NJ	$23,602,960.99	2.59%	NJ	$19,020,877.13	2.33%	FL	$4,130,628.51	4.42%
MA	$19,552,188.83	2.15%	IL	$15,520,960.65	1.90%	NY	$3,049,235.34	3.26%
OTHER	$133,495,836.75	14.66%	OTHER	$111,100,454.30	13.59%	OTHER	$17,746,738.86	18.97%

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Geographic Distribution
Group 1
State	Percent	Ending Scheduled Principal Balance
CA	$644,677,138.85	70.78%
FL	$50,543,032.77	5.55%
NY	$38,913,749.03	4.27%
NJ	$23,602,960.99	2.59%
MA	$19,552,188.83	2.15%
OTHER	$133,495,836.75	14.66%

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Prepayment Information (all groups)
	1 Month	3 Month	6 Month	12 Month	Cumulative
PSA	1200.47309%	1200.47294%	1200.47294%	1200.47294%	1200.47294%
CPR	24.84312%	24.84312%	24.84312%	24.84312%	24.84312%
SMM	2.35184%	2.35184%	2.35184%	2.35184%	2.35184%

Trigger Events
	Trigger Flag
Optional Termination Date Has Occurred; 1=Yes, 0=No	0
Senior Prepayment Step-Down Has Occurred; 1=Yes, 0=No	0
Senior Credit Support Depletion Date Has Occurred; 1=Yes, 0=No	0

Comments

1. The Subordinate Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, to certain Group 1 , Group 2 Senior Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated April 20, 2006 to that certain Prospectus Supplement, dated January 6, 2006, to which certain Senior Certificates were offered.

2. The MBA method of delinquency calculation is used.

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Certificate Payment Summary Report
Class	CUSIP	Original Principal/Notional Balance	Beginning Principal/Notional Balance	Interest Distribution	Principal Distribution	Principal Loss	Deferred Interest	Total Distribution	Ending Principal/Notional Balance
1A1A	93934FPN6	$443,914,000.00	$443,914,000.00	$1,786,136.07	$11,811,332.67	$0.00	$0.00	$13,597,468.74	$432,102,667.33
1A1B	93934FPP1	$147,972,000.00	$147,972,000.00	$595,381.37	$3,937,128.63	$0.00	$0.00	$4,532,510.00	$144,034,871.37
1A1C1	93934FPQ9	$65,509,000.00	$65,509,000.00	$276,195.77	$4,508,705.66	$0.00	$0.00	$4,784,901.43	$61,000,294.34
1A1C2	93934FPR7	$45,337,000.00	$45,337,000.00	$197,192.53	$0.00	$0.00	$0.00	$197,192.53	$45,337,000.00
1A1C3	93934FPS5	$58,608,000.00	$58,608,000.00	$259,798.52	$0.00	$0.00	$0.00	$259,798.52	$58,608,000.00
2A1A	93934FPT3	$85,926,000.00	$85,926,000.00	$365,471.92	$989,866.51	$0.00	$0.00	$1,355,338.43	$84,936,133.49
1X1A	93934FPU0	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
1X1A_NOTIONAL	XXXXXXXXX	$734,460,368.00	$734,460,368.00	$0.00	$0.00	$0.00	$0.00	$0.00	$718,733,385.18
1X1A_PRINCIPAL	XXXXXXXXX	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
1X1B	93934FPV8	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
1X1B_NOTIONAL	XXXXXXXXX	$103,098,456.00	$103,098,456.00	$0.00	$0.00	$0.00	$0.00	$0.00	$98,513,361.99
1X1B_PRINCIPAL	XXXXXXXXX	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Certificate Payment Summary Report (Continued)
Class	CUSIP	Original Principal/Notional Balance	Beginning Principal/Notional Balance	Interest Distribution	Principal Distribution	Principal Loss	Deferred Interest	Total Distribution	Ending Principal/Notional Balance
2X	93934FPW6	$0.00	$0.00	$6,308.03	$0.00	$0.00	$0.00	$6,308.03	$0.00
2X_NOTIONAL	XXXXXXXXX	$94,528,739.00	$94,528,739.00	$6,308.03	$0.00	$0.00	$0.00	$6,308.03	$93,538,160.05
2X_PRINCIPAL	XXXXXXXXX	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
B1	93934FPX4	$19,575,000.00	$19,575,000.00	$87,424.89	$13,023.22	$0.00	$0.00	$100,448.11	$19,561,976.78
B2	93934FPY2	$13,981,000.00	$13,981,000.00	$62,674.26	$9,301.54	$0.00	$0.00	$71,975.80	$13,971,698.46
B3	93934FPZ9	$5,592,000.00	$5,592,000.00	$25,161.11	$3,720.35	$0.00	$0.00	$28,881.46	$5,588,279.65
B4	93934FQA3	$6,058,000.00	$6,058,000.00	$28,318.02	$4,030.38	$0.00	$0.00	$32,348.40	$6,053,969.62
B5	93934FQB1	$4,194,000.00	$4,194,000.00	$19,779.53	$2,790.26	$0.00	$0.00	$22,569.79	$4,191,209.74
B6	93934FQC9	$3,728,000.00	$3,728,000.00	$17,737.14	$2,480.23	$0.00	$0.00	$20,217.37	$3,725,519.77
B7	93934FQD7	$3,728,000.00	$3,728,000.00	$19,135.14	$2,480.23	$0.00	$0.00	$21,615.37	$3,725,519.77
B8	93934FQE5	$2,330,000.00	$2,330,000.00	$11,959.46	$1,550.15	$0.00	$0.00	$13,509.61	$2,328,449.85
B9	93934FQF2	$3,262,000.00	$3,262,000.00	$16,743.25	$2,170.20	$0.00	$0.00	$18,913.45	$3,259,829.80
B10	93934FPH9	$5,592,000.00	$5,592,000.00	$28,702.71	$3,720.35	$0.00	$0.00	$32,423.06	$5,588,279.65

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Certificate Payment Summary Report (Continued)
Class	CUSIP	Original Principal/Notional Balance	Beginning Principal/Notional Balance	Interest Distribution	Principal Distribution	Principal Loss	Deferred Interest	Total Distribution	Ending Principal/Notional Balance
B11	93934FPJ5	$4,660,000.00	$4,660,000.00	$23,918.93	$3,100.29	$0.00	$0.00	$27,019.22	$4,656,899.71
B12	93934FPK2	$2,330,000.00	$2,330,000.00	$11,959.46	$1,550.15	$0.00	$0.00	$13,509.61	$2,328,449.85
B13	93934FPL0	$2,796,000.00	$2,796,000.00	$14,351.36	$1,860.18	$0.00	$0.00	$16,211.54	$2,794,139.82
B14	93934FPM8	$6,995,363.09	$6,995,363.09	$35,905.92	$4,654.00	$0.00	$0.00	$40,559.92	$6,990,709.09
PPP	93934FQH8	$100.00	$100.00	$25,220.00	$0.00	$0.00	$0.00	$25,220.00	$100.00
R	93934FQG0	$100.00	$100.00	$0.30	$100.00	$0.00	$0.00	$100.30	$0.00
R_SYN	XXXXXXXXX	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
TFEE	XXXXXXXXX	$0.00	$0.00	$660.23	$0.00	$0.00	$0.00	$660.23	$0.00
Total*		$932,087,563.09	$932,087,563.09	$3,915,475.69	$21,303,565.00	$0.00	$0.00	$25,219,040.69	$910,783,998.09

*Total balances exclude notional balances.

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Total Funds Available for Distribution
PRINCIPAL BALANCE
Scheduled Principal Received or Advanced	($632,544.01)
Unscheduled Principal	$1,079,882.84
Prepayments in Full	$20,856,226.19
Repurchases	$0.00
Liquidations	$0.00
Total Principal	$21,303,565.02
INTEREST
Accrued Interest at Gross Rate	$4,081,564.87
Relief Act Shortfall	$0.00
Prepayment Interest Shortfall	$0.00
Servicing Fees	$1,070,708.42
Other	$0.00
Total Interest	$3,010,856.45
ADDITIONAL FUNDS
Excess Liquidation Proceeds	$0.00
Subsequent Recoveries	$0.00
Prepayment Penalties	$31,528.03

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Total Funds Available for Distribution
ADDITIONAL FUNDS
Other	$0.00
Total Additional Funds	$31,528.03
Total Funds Available for Distribution	$24,314,421.47

Certificate Payment Report - Principal
Class	CUSIP	Beginning Principal/Notional Balance	Principal Distribution	Principal Loss	Principal Reimbursed	Subsequent Recoveries	Deferred Interest	Total Principal Distribution	Ending Principal/Notional Balance
1A1A	93934FPN6	$443,914,000.00	$11,811,332.67	$0.00	$0.00	$0.00	$0.00	$11,811,332.67	$432,102,667.33
1A1B	93934FPP1	$147,972,000.00	$3,937,128.63	$0.00	$0.00	$0.00	$0.00	$3,937,128.63	$144,034,871.37
1A1C1	93934FPQ9	$65,509,000.00	$4,508,705.66	$0.00	$0.00	$0.00	$0.00	$4,508,705.66	$61,000,294.34
1A1C2	93934FPR7	$45,337,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$45,337,000.00
1A1C3	93934FPS5	$58,608,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$58,608,000.00
2A1A	93934FPT3	$85,926,000.00	$989,866.51	$0.00	$0.00	$0.00	$0.00	$989,866.51	$84,936,133.49
1X1A	93934FPU0	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
1X1A_NOTIONAL	XXXXXXXXX	$734,460,368.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$718,733,385.18
1X1A_PRINCIPAL	XXXXXXXXX	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Certificate Payment Report - Principal (Continued)
Class	CUSIP	Beginning Principal/Notional Balance	Principal Distribution	Principal Loss	Principal Reimbursed	Subsequent Recoveries	Deferred Interest	Total Principal Distribution	Ending Principal/Notional Balance
1X1B	93934FPV8	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
1X1B_NOTIONAL	XXXXXXXXX	$103,098,456.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$98,513,361.99
1X1B_PRINCIPAL	XXXXXXXXX	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
2X	93934FPW6	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
2X_NOTIONAL	XXXXXXXXX	$94,528,739.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$93,538,160.05
2X_PRINCIPAL	XXXXXXXXX	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
B1	93934FPX4	$19,575,000.00	$13,023.22	$0.00	$0.00	$0.00	$0.00	$13,023.22	$19,561,976.78
B2	93934FPY2	$13,981,000.00	$9,301.54	$0.00	$0.00	$0.00	$0.00	$9,301.54	$13,971,698.46
B3	93934FPZ9	$5,592,000.00	$3,720.35	$0.00	$0.00	$0.00	$0.00	$3,720.35	$5,588,279.65
B4	93934FQA3	$6,058,000.00	$4,030.38	$0.00	$0.00	$0.00	$0.00	$4,030.38	$6,053,969.62
B5	93934FQB1	$4,194,000.00	$2,790.26	$0.00	$0.00	$0.00	$0.00	$2,790.26	$4,191,209.74
B6	93934FQC9	$3,728,000.00	$2,480.23	$0.00	$0.00	$0.00	$0.00	$2,480.23	$3,725,519.77
B7	93934FQD7	$3,728,000.00	$2,480.23	$0.00	$0.00	$0.00	$0.00	$2,480.23	$3,725,519.77

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Certificate Payment Report - Principal (Continued)
Class	CUSIP	Beginning Principal/Notional Balance	Principal Distribution	Principal Loss	Principal Reimbursed	Subsequent Recoveries	Deferred Interest	Total Principal Distribution	Ending Principal/Notional Balance
B8	93934FQE5	$2,330,000.00	$1,550.15	$0.00	$0.00	$0.00	$0.00	$1,550.15	$2,328,449.85
B9	93934FQF2	$3,262,000.00	$2,170.20	$0.00	$0.00	$0.00	$0.00	$2,170.20	$3,259,829.80
B10	93934FPH9	$5,592,000.00	$3,720.35	$0.00	$0.00	$0.00	$0.00	$3,720.35	$5,588,279.65
B11	93934FPJ5	$4,660,000.00	$3,100.29	$0.00	$0.00	$0.00	$0.00	$3,100.29	$4,656,899.71
B12	93934FPK2	$2,330,000.00	$1,550.15	$0.00	$0.00	$0.00	$0.00	$1,550.15	$2,328,449.85
B13	93934FPL0	$2,796,000.00	$1,860.18	$0.00	$0.00	$0.00	$0.00	$1,860.18	$2,794,139.82
B14	93934FPM8	$6,995,363.09	$4,654.00	$0.00	$0.00	$0.00	$0.00	$4,654.00	$6,990,709.09
PPP	93934FQH8	$100.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$100.00
R	93934FQG0	$100.00	$100.00	$0.00	$0.00	$0.00	$0.00	$100.00	$0.00
R_SYN	XXXXXXXXX	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
TFEE	XXXXXXXXX	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
Total *		$932,087,563.09	$21,303,565.00	$0.00	$0.00	$0.00	$0.00	$21,303,565.00	$910,783,998.09

*Total balances exclude notional balances.

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Certificate Payment Report - Interest
Class	Beginning Principal/Notional Balance	Interest Rate Accrued	Interest Rate Paid	Interest Accrued	Prepayment Interest Shortfall	Relief Act Shortfall	Other Interest Shortfall	Unscheduled Interest	Interest Reimbursed	Carryforward Amount Paid	Total Interest Distributed	Total Carryforward Amount Remaining
1A1A	$443,914,000.00	4.8283300000%	4.8283300000%	$1,786,136.07	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$1,786,136.07	$0.00
1A1B	$147,972,000.00	4.8283300000%	4.8283300000%	$595,381.37	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$595,381.37	$0.00
1A1C1	$65,509,000.00	5.0593800000%	5.0593800000%	$276,195.77	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$276,195.77	$0.00
1A1C2	$45,337,000.00	5.2193800000%	5.2193800000%	$197,192.53	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$197,192.53	$0.00
1A1C3	$58,608,000.00	5.3193800000%	5.3193800000%	$259,798.52	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$259,798.52	$0.00
2A1A	$85,926,000.00	5.1040000000%	5.1040000000%	$365,471.92	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$365,471.92	$0.00
1X1A	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
1X1A_NOTIONAL	$734,460,368.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
1X1A_PRINCIPAL	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
1X1B	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
1X1B_NOTIONAL	$103,098,456.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
1X1B_PRINCIPAL	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Certificate Payment Report - Interest (Continued)
Class	Beginning Principal/Notional Balance	Interest Rate Accrued	Interest Rate Paid	Interest Accrued	Prepayment Interest Shortfall	Relief Act Shortfall	Other Interest Shortfall	Unscheduled Interest	Interest Reimbursed	Carryforward Amount Paid	Total Interest Distributed	Total Carryforward Amount Remaining
2X	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$6,308.03	$0.00
2X_NOTIONAL	$94,528,739.00	0.0000000000%	0.0800776153%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$6,308.03	$0.00
2X_PRINCIPAL	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
B1	$19,575,000.00	5.3593800000%	5.3593800000%	$87,424.89	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$87,424.89	$0.00
B2	$13,981,000.00	5.3793800000%	5.3793800000%	$62,674.26	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$62,674.26	$0.00
B3	$5,592,000.00	5.3993800000%	5.3993800000%	$25,161.11	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$25,161.11	$0.00
B4	$6,058,000.00	5.6093800000%	5.6093800000%	$28,318.02	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$28,318.02	$0.00
B5	$4,194,000.00	5.6593800000%	5.6593800000%	$19,779.53	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$19,779.53	$0.00
B6	$3,728,000.00	5.7093800000%	5.7093800000%	$17,737.14	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$17,737.14	$0.00
B7	$3,728,000.00	6.1593800000%	6.1593800000%	$19,135.14	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$19,135.14	$0.00
B8	$2,330,000.00	6.1593800000%	6.1593800000%	$11,959.46	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$11,959.46	$0.00
B9	$3,262,000.00	6.1593800000%	6.1593800000%	$16,743.25	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$16,743.25	$0.00
B10	$5,592,000.00	6.1593800000%	6.1593800000%	$28,702.71	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$28,702.71	$0.00

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Certificate Payment Report - Interest (Continued)
Class	Beginning Principal/Notional Balance	Interest Rate Accrued	Interest Rate Paid	Interest Accrued	Prepayment Interest Shortfall	Relief Act Shortfall	Other Interest Shortfall	Unscheduled Interest	Interest Reimbursed	Carryforward Amount Paid	Total Interest Distributed	Total Carryforward Amount Remaining
B11	$4,660,000.00	6.1593800000%	6.1593800000%	$23,918.93	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$23,918.93	$0.00
B12	$2,330,000.00	6.1593800000%	6.1593800000%	$11,959.46	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$11,959.46	$0.00
B13	$2,796,000.00	6.1593800000%	6.1593800000%	$14,351.36	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$14,351.36	$0.00
B14	$6,995,363.09	6.1593800000%	6.1593800000%	$35,905.92	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$35,905.92	$0.00
PPP	$100.00	0.0000000000%	302639.9999999999%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$25,220.00	$0.00
R	$100.00	3.6530000000%	3.6530000000%	$0.30	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.30	$0.00
R_SYN	$0.00	0.0000000000%	0.0000000000%	$0.00	$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	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$660.23	$0.00
Total *	$932,087,563.09			$3,883,947.66	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$3,915,475.69	$0.00

*Total balances exclude notional balances.

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Principal Factors Report
Class	Original Scheduled Balance	Beginning Principal/Notional Balance	Principal Loss	Principal Reimbursed	Subsequent Recoveries	Deferred Interest	Total Principal	Ending Principal/Notional Balance Percent	Ending Principal/Notional Balance
1A1A	$443,914,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	26.60725427	0.9733927457	973.39274573
1A1B	$147,972,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	26.60725428	0.9733927457	973.39274572
1A1C1	$65,509,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	68.82574394	0.9311742561	931.17425606
1A1C2	$45,337,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	1.0000000000	1,000.00000000
1A1C3	$58,608,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	1.0000000000	1,000.00000000
2A1A	$85,926,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	11.51998825	0.9884800118	988.48001175
1X1A	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
1X1A_NOTIONAL	$734,460,368.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.9785870232	978.58702320
1X1A_PRINCIPAL	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
1X1B	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
1X1B_NOTIONAL	$103,098,456.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.9555270351	955.52703515

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Principal Factors Report (Continued)
Class	Original Scheduled Balance	Beginning Principal/Notional Balance	Principal Loss	Principal Reimbursed	Subsequent Recoveries	Deferred Interest	Total Principal	Ending Principal/Notional Balance Percent	Ending Principal/Notional Balance
1X1B_PRINCIPAL	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
2X	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
2X_NOTIONAL	$94,528,739.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.9895208699	989.52086994
2X_PRINCIPAL	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
B1	$19,575,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.66529860	0.9993347014	999.33470140
B2	$13,981,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.66529862	0.9993347014	999.33470138
B3	$5,592,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.66529864	0.9993347014	999.33470136
B4	$6,058,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.66529878	0.9993347012	999.33470122
B5	$4,194,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.66529804	0.9993347020	999.33470196
B6	$3,728,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.66529775	0.9993347023	999.33470225
B7	$3,728,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.66529775	0.9993347023	999.33470225
B8	$2,330,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.66530043	0.9993346996	999.33469957
B9	$3,262,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.66529736	0.9993347026	999.33470264

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Principal Factors Report (Continued)
Class	Original Scheduled Balance	Beginning Principal/Notional Balance	Principal Loss	Principal Reimbursed	Subsequent Recoveries	Deferred Interest	Total Principal	Ending Principal/Notional Balance Percent	Ending Principal/Notional Balance
B10	$5,592,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.66529864	0.9993347014	999.33470136
B11	$4,660,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.66529828	0.9993347017	999.33470172
B12	$2,330,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.66530043	0.9993346996	999.33469957
B13	$2,796,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.66530043	0.9993346996	999.33469957
B14	$6,995,363.09	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.66529785	0.9993347022	999.33470215
PPP	$100.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	1.0000000000	1,000.00000000
R	$100.00	1,000.00000000	0.00000000	0.00000000	0.00000000	0.00000000	1000.00000000	0.0000000000	0.00000000
R_SYN	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
TFEE	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Interest Factors Report
Class	Original Balance	Interest Rate Accrued	Interest Rate Paid	Current Month Interest Accrued	Prepayment Interest Shortfall	Relief Act Interest Shortfall	Other Interest Shortfall	Unscheduled Interest	Interest Reimbursed	Carryforward Amount Paid	Deferred Interest	Total Interest Distribution	Total Carryforward Amount Remaining
1A1A	$443,914,000.00	4.8283300000%	4.8283300000%	4.02360833	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.02360833	0.00000000
1A1B	$147,972,000.00	4.8283300000%	4.8283300000%	4.02360832	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.02360832	0.00000000
1A1C1	$65,509,000.00	5.0593800000%	5.0593800000%	4.21614999	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.21614999	0.00000000
1A1C2	$45,337,000.00	5.2193800000%	5.2193800000%	4.34948342	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.34948342	0.00000000
1A1C3	$58,608,000.00	5.3193800000%	5.3193800000%	4.43281668	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.43281668	0.00000000
2A1A	$85,926,000.00	5.1040000000%	5.1040000000%	4.25333333	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.25333333	0.00000000
1X1A	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
1X1A_NOTIONAL	$734,460,368.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
1X1A_PRINCIPAL	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
1X1B	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
1X1B_NOTIONAL	$103,098,456.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Interest Factors Report (Continued)
Class	Original Balance	Interest Rate Accrued	Interest Rate Paid	Current Month Interest Accrued	Prepayment Interest Shortfall	Relief Act Interest Shortfall	Other Interest Shortfall	Unscheduled Interest	Interest Reimbursed	Carryforward Amount Paid	Deferred Interest	Total Interest Distribution	Total Carryforward Amount Remaining
1X1B_PRINCIPAL	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
2X	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
2X_NOTIONAL	$94,528,739.00	0.0000000000%	0.0800776153%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.06673135	0.00000000
2X_PRINCIPAL	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
B1	$19,575,000.00	5.3593800000%	5.3593800000%	4.46615019	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.46615019	0.00000000
B2	$13,981,000.00	5.3793800000%	5.3793800000%	4.48281668	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.48281668	0.00000000
B3	$5,592,000.00	5.3993800000%	5.3993800000%	4.49948319	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.49948319	0.00000000
B4	$6,058,000.00	5.6093800000%	5.6093800000%	4.67448333	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.67448333	0.00000000
B5	$4,194,000.00	5.6593800000%	5.6593800000%	4.71614926	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.71614926	0.00000000
B6	$3,728,000.00	5.7093800000%	5.7093800000%	4.75781652	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	4.75781652	0.00000000
B7	$3,728,000.00	6.1593800000%	6.1593800000%	5.13281652	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	5.13281652	0.00000000
B8	$2,330,000.00	6.1593800000%	6.1593800000%	5.13281545	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	5.13281545	0.00000000
B9	$3,262,000.00	6.1593800000%	6.1593800000%	5.13281729	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	5.13281729	0.00000000

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Interest Factors Report (Continued)
Class	Original Balance	Interest Rate Accrued	Interest Rate Paid	Current Month Interest Accrued	Prepayment Interest Shortfall	Relief Act Interest Shortfall	Other Interest Shortfall	Unscheduled Interest	Interest Reimbursed	Carryforward Amount Paid	Deferred Interest	Total Interest Distribution	Total Carryforward Amount Remaining
B10	$5,592,000.00	6.1593800000%	6.1593800000%	5.13281652	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	5.13281652	0.00000000
B11	$4,660,000.00	6.1593800000%	6.1593800000%	5.13281760	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	5.13281760	0.00000000
B12	$2,330,000.00	6.1593800000%	6.1593800000%	5.13281545	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	5.13281545	0.00000000
B13	$2,796,000.00	6.1593800000%	6.1593800000%	5.13281831	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	5.13281831	0.00000000
B14	$6,995,363.09	6.1593800000%	6.1593800000%	5.13281720	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	5.13281720	0.00000000
PPP	$100.00	0.0000000000%	302639.9999999999%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	252,200.00000000	0.00000000
R	$100.00	3.6530000000%	3.6530000000%	3.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	3.00000000	0.00000000
R_SYN	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	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	0.00000000	0.00000000

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Collateral Report Pool 2916
LOAN COUNT
Original Loan Count	1381
Beginning Loan Count	1381
Loans Added	0
Loans Prepaid-in-full	30
Loans Liquidated-in-full	0
Loans Repurchased	0
Ending Loan Count	1351
PRINCIPAL BALANCE
Original Scheduled Principal Balance	$837,558,824.09
Beginning Scheduled Principal Balance	$837,558,824.09
Scheduled Principal Received or Advanced	($490,151.69)
Unscheduled Principal	$1,031,743.19
Prepayments-in-full	$19,770,485.42

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Collateral Report Pool 2916 (Continued)
PRINCIPAL BALANCE
Liquidations-in-full	$0.00
Repurchases	$0.00
Principal Losses	$0.00
Ending Scheduled Principal Balance	$817,246,747.17
INTEREST
Accrued Interest at Gross Rate	$3,591,281.76
Unscheduled Interest	$0.00
Uncollected Interest	($9,280.32)
Relief Act Shortfall	$0.00
Prepayment Interest Shortfall	$0.00
Other Interest Shortfall	$0.00

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Collateral Report Pool 2916 (Continued)
FEES
Servicing Fees	$1,041,167.89
Other Fees	$0.00
ADDITIONAL FUNDS
Excess Liquidation Proceeds	$0.00
Subsequent Recoveries	$0.00
Prepayment Penalties	$31,528.03
Other	$0.00

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Collateral Report Pool 2917
LOAN COUNT
Original Loan Count	237
Beginning Loan Count	237
Loans Added	0
Loans Prepaid-in-full	4
Loans Liquidated-in-full	0
Loans Repurchased	0
Ending Loan Count	233
PRINCIPAL BALANCE
Original Scheduled Principal Balance	$94,529,648.15
Beginning Scheduled Principal Balance	$94,529,648.15
Scheduled Principal Received or Advanced	($142,392.32)
Unscheduled Principal	$48,139.65
Prepayments-in-full	$1,085,740.77

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Collateral Report Pool 2917 (Continued)
PRINCIPAL BALANCE
Liquidations-in-full	$0.00
Repurchases	$0.00
Principal Losses	$0.00
Ending Scheduled Principal Balance	$93,538,160.05
INTEREST
Accrued Interest at Gross Rate	$490,283.11
Unscheduled Interest	$0.00
Uncollected Interest	($297.79)
Relief Act Shortfall	$0.00
Prepayment Interest Shortfall	$0.00
Other Interest Shortfall	$0.00

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Collateral Report Pool 2917 (Continued)
FEES
Servicing Fees	$29,540.53
Other Fees	$0.00
ADDITIONAL FUNDS
Excess Liquidation Proceeds	$0.00
Subsequent Recoveries	$0.00
Prepayment Penalties	$0.00
Other	$0.00

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Collateral Report Group 1
LOAN COUNT
Original Loan Count	1618
Beginning Loan Count	1618
Loans Added	0
Loans Prepaid-in-full	34
Loans Liquidated-in-full	0
Loans Repurchased	0
Ending Loan Count	1584
PRINCIPAL BALANCE
Original Scheduled Principal Balance	$932,088,472.24
Beginning Scheduled Principal Balance	$932,088,472.24
Scheduled Principal Received or Advanced	($632,544.01)
Unscheduled Principal	$1,079,882.84
Prepayments-in-full	$20,856,226.19

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Collateral Report Group 1 (Continued)
PRINCIPAL BALANCE
Liquidations-in-full	$0.00
Repurchases	$0.00
Principal Losses	$0.00
Ending Scheduled Principal Balance	$910,784,907.22
INTEREST
Accrued Interest at Gross Rate	$4,081,564.87
Unscheduled Interest	$0.00
Uncollected Interest	($9,578.11)
Relief Act Shortfall	$0.00
Prepayment Interest Shortfall	$0.00
Other Interest Shortfall	$0.00

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Collateral Report Group 1 (Continued)
FEES
Servicing Fees	$1,070,708.42
Other Fees	$0.00
ADDITIONAL FUNDS
Excess Liquidation Proceeds	$0.00
Subsequent Recoveries	$0.00
Prepayment Penalties	$31,528.03
Other	$0.00

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Collateral Report Total
LOAN COUNT
Original Loan Count	1618
Beginning Loan Count	1618
Loans Added	0
Loans Prepaid-in-full	34
Loans Liquidated-in-full	0
Loans Repurchased	0
Ending Loan Count	1584
PRINCIPAL BALANCE
Original Scheduled Principal Balance	$932,088,472.24
Beginning Scheduled Principal Balance	$932,088,472.24
Scheduled Principal Received or Advanced	($632,544.01)
Unscheduled Principal	$1,079,882.84
Prepayments-in-full	$20,856,226.19

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Collateral Report Total (Continued)
PRINCIPAL BALANCE
Liquidations-in-full	$0.00
Repurchases	$0.00
Principal Losses	$0.00
Ending Scheduled Principal Balance	$910,784,907.22
INTEREST
Accrued Interest at Gross Rate	$4,081,564.87
Unscheduled Interest	$0.00
Uncollected Interest	($9,578.11)
Relief Act Shortfall	$0.00
Prepayment Interest Shortfall	$0.00
Other Interest Shortfall	$0.00

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Collateral Report Total (Continued)
FEES
Servicing Fees	$1,070,708.42
Other Fees	$0.00
ADDITIONAL FUNDS
Excess Liquidation Proceeds	$0.00
Subsequent Recoveries	$0.00
Prepayment Penalties	$31,528.03
Other	$0.00

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Delinquency Information by Group*
Group ID	1 Month Count	Scheduled Ending Balance	2 Months Count	Scheduled Ending Balance	3 Months Count	Scheduled Ending Balance	4+ Months Count	Scheduled Ending Balance
Pool 2916	0	$0.00	0	$0.00	0	$0.00	0	$0.00
Pool 2917	0	$0.00	0	$0.00	0	$0.00	0	$0.00
Group 1	0	$0.00	0	$0.00	0	$0.00	0	$0.00
Aggregate	0	$0.00	0	$0.00	0	$0.00	0	$0.00

* Does not include mortgage loans in foreclosure or REO.

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Foreclosure, REO, and Bankruptcy by Group**
Group ID	Foreclosure Count	Scheduled Ending Balance	REO Count	Scheduled Ending Balance	Bankruptcy Count	Scheduled Ending Balance
Pool 2916	0	$0.00	0	$0.00	0	$0.00
Pool 2917	0	$0.00	0	$0.00	0	$0.00
Group 1	0	$0.00	0	$0.00	0	$0.00
Aggregate	0	$0.00	0	$0.00	0	$0.00

** Loans in Bankruptcy will also be reflected under their applicable delinquency or foreclosure status.

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Aggregate Loss Amount by Group
Group ID	Count	Loss Amount
Pool 2916	0	$0.00
Pool 2917	0	$0.00
Group 1	0	$0.00
Aggregate	0	$0.00

Servicer Advances by Group
Group	Count	Total
Pool 2916	0	$0.00
Pool 2917	0	$0.00
Group 1	0	$0.00
Aggregate	0	$0.00

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Stop Advances Loans
Group	Count	Loan Balance	Total Scheduled P&I
Pool 2916	0	$0.00	$0.00
Pool 2917	0	$0.00	$0.00
Group 1	0	$0.00	$0.00
Aggregate	0	$0.00	$0.00

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Delinquency Roll Rates-Aggregate***
Current Value	Current		1 Month		2 Months		3 Months
Prior Value	Count	Balance	Count	Balance	Count	Balance	Count	Balance
Current	1584	$910,784,907.22	0	$0.00	0	$0.00	0	$0.00
Delq 1 Month	0	$0.00	0	$0.00	0	$0.00	0	$0.00
Delq 2 Month	0	$0.00	0	$0.00	0	$0.00	0	$0.00
Delq 3 Month	0	$0.00	0	$0.00	0	$0.00	0	$0.00
Delq 4 Month	0	$0.00	0	$0.00	0	$0.00	0	$0.00
Foreclosure	0	$0.00	0	$0.00	0	$0.00	0	$0.00

Current Value	4+ Months		Foreclosure		REO
Prior Value	Count	Balance	Count	Balance	Count	Balance
Current	0	$0.00	0	$0.00	0	$0.00
Delq 1 Month	0	$0.00	0	$0.00	0	$0.00
Delq 2 Month	0	$0.00	0	$0.00	0	$0.00
Delq 3 Month	0	$0.00	0	$0.00	0	$0.00
Delq 4 Month	0	$0.00	0	$0.00	0	$0.00
Foreclosure	0	$0.00	0	$0.00	0	$0.00

*** To use this chart, locate along the Current Value row the desired delinquency status as of the immediately preceding due date (e.g. Current, 1 Month delinquent, etc.). Use the left hand column labeled Prior Value to see the prior month's value. Follow the selected Current Value column to the desired Prior Value row.

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Credit Enhancement
Type	Original Balance	Beginning Balance	Reduction	Increase	Ending Balance
Interest Coverage Account	$873,091.20	$873,091.20	$873,091.20	$0.00	$0.00
Over Collateralization	$0.00	$0.00	$0.00	$0.00	$0.00
Reserve Account	$0.00	$0.00	$0.00	$0.00	$0.00
Other	$0.00	$0.00	$0.00	$0.00	$0.00

Insurance
Insurance Type	Original Balance	Claims Paid	Coverage Remaining
Pool Insurance	$0.00	$0.00	$0.00
Other	$0.00	$0.00	$0.00

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Subordinate Class Certificate Balances
The Class Principal Balances of each Class of the Class B1,B2,B3,B4,B5,B6,B7,B8,B9,B10,B11,B12,B13,B14 Certificates immediately after the principal and interest distribution on 05/25/2006 are as follows:
Class	Ending Principal Balance	Percentage of Aggregate Certificate Principal Balance on Closing Date	Percentage of Aggregate Certificate Ending Principal Balance
B1	$19,561,976.78	2.10%	2.15%
B2	$13,971,698.46	1.50%	1.53%
B3	$5,588,279.65	0.60%	0.61%
B4	$6,053,969.62	0.65%	0.66%
B5	$4,191,209.74	0.45%	0.46%
B6	$3,725,519.77	0.40%	0.41%
B7	$3,725,519.77	0.40%	0.41%
B8	$2,328,449.85	0.25%	0.26%
B9	$3,259,829.80	0.35%	0.36%
B10	$5,588,279.65	0.60%	0.61%
B11	$4,656,899.71	0.50%	0.51%
B12	$2,328,449.85	0.25%	0.26%

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Subordinate Class Certificate Balances
The Class Principal Balances of each Class of the Class B1,B2,B3,B4,B5,B6,B7,B8,B9,B10,B11,B12,B13,B14 Certificates immediately after the principal and interest distribution on 05/25/2006 are as follows:
Class	Ending Principal Balance	Percentage of Aggregate Certificate Principal Balance on Closing Date	Percentage of Aggregate Certificate Ending Principal Balance
B13	$2,794,139.82	0.30%	0.31%
B14	$6,990,709.09	0.75%	0.77%
Total	$84,764,931.56	9.10%	9.31%

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Glossary of Terms
TERM	DEFINITION
Average Ending Scheduled Principal Balance	Average scheduled principal balance of all mortgage loans as of the immediately preceding due date.
Compensating Interest	Interest paid by the servicer or master servicer in respect of Prepayment Interest Shortfall, subject to specified caps.
CPR (Constant Prepayment Rate)	The annualized, compounded single month mortality rate.
Current Interest Accrued	The interest accrued for the current month's distribution.
Deferred Interest	When a scheduled monthly payment is less than required to satisfy the note rate, the unpaid interest is deferred by adding it to the loan balance and the certificate balances.
Excess Liquidation Proceeds	Funds received at the time of liquidation in excess of the amount needed to satisfy the outstanding scheduled principal balance and related expenses.
Interest Rate Accrued	The rate at which interest is accrued for the current month's distribution.
Interest Rate Paid	The rate at which interest is paid for the current month's distribution.
Uncollected Interest	Interest not collected on delinquent loans for which scheduled payments are no longer being advanced, interest uncollected on prepayments and interest uncollected on liquidations.
Other Interest Shortfall	Any interest shortfall other than Uncompensated Interest Shortfall, Deferred Interest or Interest Uncollected on Non-Earning Assets.
Over Collateralization	Any excess of the aggregate principal balance of the mortgage loans over the aggregate principal balance of the certificates.
Prefunding Amount	The amount of cash being held for future loan purchases.

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Glossary of Terms (Continued)
TERM	DEFINITION
Prepayment Interest Shortfall	Any shortfall in collections of interest on mortgage loans resulting from prepayments in full or partial prepayments.
Principal Loss	The amount of principal reduction due to a loss realized on the mortgage loans.
Principal Reimbursed	The amount of principal passed through as a reimbursement.
PSA (Prepayment Speed Assumption)	A prepayment model that in its base case (stated as 100% PSA), assumes that prepayments start in month one at an annual CPR of 0.2%, rising linearly to 6.0% CPR in month 30, and then remain flat at 6.0% CPR thereafter.
Relief Act Shortfall	Interest shortfall resulting from application of the Servicemembers Civil Relief Act.
REO (Real Estate Owned)	Property acquired by the trust through foreclosure or deed-in-lieu of foreclosure on a defaulted loan.
Reserve Account	Funded or non-funded accounts set up at either the property or portfolio level in in anticipation of periodic or non-periodic capital expenditures or cash needs.
Servicer Advances	Scheduled principal and interest advances made by the servicer or master servicer for delinquent mortgage loans.
Servicing Fees	The monthly fee paid to the servicer to perform primary servicing function for the master servicer with respect to the mortgage loans and if applicable the fee charged by the master servicer for supervising the mortgage loan servicing.
SMM (Single Month Mortality)	In any given month, the SMM measures the percentage of the beginning pool balance that was paid back earlier than scheduled through payoffs.
Stop Advance	The amount of principal and interest on delinquent mortgage loans for which scheduled payments are no longer being advanced.
Subsequent Recoveries	The amount of funds recovered on mortgage loans that were previously liquidated at a loss.
Trigger Event	An event that may require a change in payment priority.

Series: WAMU 2006-AR4	Washington Mutual
Issue Date: 04/25/2006
Record Date: 04/28/2006
Distribution Date: 05/25/2006

Glossary of Terms (Continued)
TERM	DEFINITION
Unscheduled Interest	Interested collected in addition to the scheduled interest payment.
Unscheduled Principal	Payments of principal which were received with respect to any mortgage loan during the prior period, other than monthly scheduled principal, prepayments in full, repurchases, liquidation principal and subsequent recoveries.
Weighted Average Loan Age	For any distribution date, the weighted average of the loan age on the mortgage loans as of the immediately preceding due date.
Weighted Average Mortgage Interest Rate	For any distribution date, the weighted average of the mortgage interest rates on the mortgage loans as of the second preceding due date (after giving effect to the payments due on the mortgage loans on that due date).
Weighted Average Pass Through Rate	For any distribution date, the weighted average of the pass-through rates on the mortgage loans as of the second preceding due date (after giving effect to the payments due on the mortgage loans on that due date).
Weighted Average Remaining Term	For any distribution date, the weighted average of the maturity on the mortgage loans as of the immediately preceding due date.
MBA Delinquency Calculation	In this calculation, a loan increases its delinquency status if a monthly payment is not received by the end of the day immediately preceding the loan's next due date.
OTS Delinquency Calculation	In this calculation, a loan increases its delinquency status if a monthly payment is not received by the loan's due date in the following month.

WaMu Mortgage Pass-Through Certificates, Series 2006-AR4 10-D/A