SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 8-K
CURRENT REPORT
Pursuant to Section 13 or 15(d) of the
Securities Exchange Act of 1934
Date of Report (date of earliest event reported): May 19,2000
Credit Suisse First Boston Mortgage Securities Corp Mortgage-Backed Pass-Through
Certificates, Series 1999-WM1
(Exact name of registrant as specified in its charter)
United States 333-53115 13-3320910
(State or Other Jurisdiction (Commission (I.R.S. Employer
of Incorporation) File Number) Identification No.)
11 Madison Avenue, 5th Floor
New York, New York 10010
(Address of Principal Executive Offices) (Zip Code)
Registrant's telephone number, including area code: (212) 325-2000
Item 5. Other Events
On May 19, 2000 a scheduled distribution was made from the Trust
to holders of the Certificates. The Trustee has caused to be filed with
the Commission, the Monthly Report dated May 19,2000
The Monthly Report is filed pursuant to and in accordance with
(1) numerous no-action letters (2) current Commission policy
in the area.
In April, 2000, Form 15 was filed as technically required under Section
15 D of the act. Registrant chooses to continue to report voluntarily
on a monthly basis.
A. Monthly Report Information
See Exhibit No.1
B. Have and deficiencies occurred? NO.
Date:
Amount:
C. Item 1: Legal Proceedings: NONE
D. Item 2: Changes in Securities: NONE
E. Item 4: Submission of Matters to a Vote of
Certificateholders: NONE
F. Item 5: Other Information - Form 10-Q, PartII - Items 1,2,4,5
if applicable: NOT APPLICABLE
Item 7. Monthly Statements and Exhibits
Exhibit No.
1.) Monthly Distribution RepoMay 19,2000
Washington Mutual Bank, FA Mortgage-Backed Pass-Through Certificates
STATEMENT TO CERTIFICATEHOLDERS
Distribution Date: May 19,2000
DISTRIBUTION SUMMARY
Beginning Current PerioClass Accrued
Original Current PrincipaPrincipal Pass-Through Interest
Class Face Value Amount Distribution Rate Distributed (1)
1-A-1 222151000.00 198422516.83 4999392.82 6.1907% 1023273.32
1-A-2 208709000.00 208709000.00 0.00 6.1907% 1076321.15
2-A-1 257137000.00 242312716.09 4998071.90 6.0175% 1214888.38
2-A-2 147243000.00 147243000.00 0.00 6.0175% 738235.34
3-A-1 599085000.00 562029066.35 6004559.77 6.3980% 2996129.11
3-A-2 350619000.00 350619000.00 0.00 6.3980% 1869120.05
4-A-1 157510000.00 139992522.83 5083515.73 6.9446% 809802.26
4-A-2 108014000.00 108014000.00 0.00 6.9446% 625091.01
5-A-1 350000000.00 275962142.11 12713205.57 6.7321% 1547111.06
5-A-2 469803000.00 469803000.00 0.00 6.7321% 2633830.19
5-A-3 200000000.00 200000000.00 0.00 6.7321% 1122022.84
6-A-1 450000000.00 409654436.82 10031017.10 6.8676% 2343540.56
6-A-2 490357000.00 490357000.00 0.00 6.8676% 2805221.71
6-A-3 200000000.00 200000000.00 0.00 6.8676% 1144602.27
7-A 44457000.00 38129718.71 1109296.36 7.6061% 241645.37
8-A 61246000.00 60020328.90 46095.63 7.5757% 378899.90
M-1 129023000.00 128445798.06 118029.92 6.6076% 706988.19
M-2 107909000.00 107426254.41 98714.88 6.6076% 591292.93
M-3 60992000.00 60719143.99 55795.33 6.6076% 334208.81
M-4 30495000.00 30358576.47 27896.75 6.6076% 167098.93
B-1 21113000.00 21018548.12 19314.12 6.6076% 115689.78
B-2 11728000.00 11675533.19 10728.75 6.6076% 64264.18
B-3 14079705.76 14016718.27 12880.08 6.6076% 77150.47
R 200.00 0.00 0.00 7.5757% 0.00
TOTAL:4691670905.76 4474929021.14 45328514.71 24626427.81
(1) Interest Distribution includes Reimbursement of Realized Losses
Prepayment Ending
Realized LossInterest Interest Current Principal
Principal Shortfall Shortfall Amount
Class
1-A-1 0.00 0.00 380.00 193423124.01
1-A-2 0.00 0.00 399.70 208709000.00
2-A-1 0.00 0.00 209.35 237314644.19
2-A-2 0.00 0.00 127.21 147243000.00
3-A-1 0.00 0.00 436.51 556024506.58
3-A-2 0.00 0.00 272.31 350619000.00
4-A-1 0.00 0.00 352.61 134909007.10
4-A-2 0.00 0.00 0.00 108014000.00
5-A-1 0.00 0.00 1068.07 263248936.54
5-A-2 0.00 0.00 1818.29 469803000.00
5-A-3 0.00 0.00 0.00 200000000.00
6-A-1 0.00 0.00 916.44 399623419.72
6-A-2 0.00 0.00 1096.98 490357000.00
6-A-3 0.00 0.00 0.00 200000000.00
7-A 0.00 0.00 38.19 37020422.35
8-A 0.00 0.00 14.89 59974233.27
M-1 0.00 0.00 271.96 128327768.14
M-2 0.00 0.00 227.46 107327539.53
M-3 0.00 0.00 128.56 60663348.66
M-4 0.00 0.00 64.28 30330679.72
B-1 0.00 0.00 44.50 20999234.00
B-2 0.00 0.00 24.72 11664804.44
B-3 0.00 0.00 29.68 14003838.19
R 0.00 0.00 0.00 0.00
TOTAL: 0 0 7921.71 4429600506
AMOUNTS PER $1,000 UNIT
Beginning Ending
Current PrincipaPrincipal Interest Current Principal
Class Cusip Amount Distribution Distribution Amount
1-A-1 22540ANQ7 893.18759234 22.50448038 4.60620623 870.68311196
1-A-2 22540ANR5 1000.00000000 0.00000000 5.15704234 1000.00000000
2-A-1 22540ANS3 942.34869383 19.43738902 4.72467354 922.91130481
2-A-2 22540ANT1 1000.00000000 0.00000000 5.01372113 1000.00000000
3-A-1 22540ANU8 938.14578289 10.02288452 5.00117531 928.12289838
3-A-2 2254A0NV6 1000.00000000 0.00000000 5.33091490 1000.00000000
4-A-1 22540ANW4 888.78498400 32.27424119 5.14127522 856.51074281
4-A-2 100001523 1000.00000000 0.00000000 5.78712954 1000.00000000
5-A-1 22540ANY0 788.46326317 36.32344449 4.42031731 752.13981869
5-A-2 22540ANZ7 1000.00000000 0.00000000 5.60624387 1000.00000000
5-A-3 100001524 1000.00000000 0.00000000 5.61011420 1000.00000000
6-A-1 22540APB8 910.34319293 22.29114911 5.20786791 888.05204382
6-A-2 22540APC6 1000.00000000 0.00000000 5.72077427 1000.00000000
6-A-3 10001525 1000.00000000 0.00000000 5.72301135 1000.00000000
7-A 22540APE2 857.67637740 24.95211913 5.43548530 832.72425827
8-A 22540APF9 979.98773634 0.75263087 6.18652483 979.23510548
M-1 22540APJ1 995.52636398 0.91479752 5.47955162 994.61156646
M-2 22540APK8 995.52636397 0.91479747 5.47955160 994.61156651
M-3 22540APL6 995.52636395 0.91479751 5.47955155 994.61156643
M-4 22540APM4 995.52636399 0.91479751 5.47955177 994.61156649
B-1 100001526 995.52636385 0.91479752 5.47955179 994.61156633
B-2 100001527 995.52636340 0.91479792 5.47955143 994.61156548
B-3 100001528 995.52636319 0.91479753 5.47955145 994.61156566
R-1 22540APG7 0.00000000 0.00000000 0.00000000 0.00000000
R-2 22540APH5 0.00000000 0.00000000 0.00000000 0.00000000
SIGNATURES
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.
WASHINGTON MUTUAL BANK, FA
MORTGAGE-BACKED PASS-THROUGH CERTIFICATES
SERIES 1999-WM1
By: /s/ Barbara Grosse
Name: Barbara Grosse
Title: Vice President
Bank One, NA
