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): February 22, 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 February 22, 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 February 22, 2000
The Monthly Report is filed pursuant to and in accordance with
(1) numerous no-action letters (2) current Commission policy
in the area.
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 RepoFebruary 22, 2000
Washington Mutual Bank, FA Mortgage-Backed Pass-Through Certificates
STATEMENT TO CERTIFICATEHOLDERS
Distribution Date: February 22, 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 212524342.20 3409393.28 6.1916% 1096099.83
1-A-2 208709000.00 208709000.00 0.00 6.1916% 1076422.10
2-A-1 257137000.00 252292150.09 1656924.16 6.0175% 1264555.39
2-A-2 147243000.00 147243000.00 0.00 6.0175% 738021.09
3-A-1 599085000.00 583097055.90 6269663.39 6.3977% 3108215.57
3-A-2 350619000.00 350619000.00 0.00 6.3977% 1868984.63
4-A-1 157510000.00 147484252.97 982301.27 6.9436% 852599.56
4-A-2 108014000.00 108014000.00 0.00 6.9436% 625000.51
5-A-1 350000000.00 319432191.54 14518351.05 6.7331% 1791907.44
5-A-2 469803000.00 469803000.00 0.00 6.7331% 2635437.23
5-A-3 200000000.00 200000000.00 0.00 6.7331% 1122189.78
6-A-1 450000000.00 434022727.30 4843962.82 6.8664% 2482986.29
6-A-2 490357000.00 490357000.00 0.00 6.8664% 2805267.17
6-A-3 200000000.00 200000000.00 0.00 6.8664% 1144404.99
7-A 44457000.00 41972751.87 593747.80 7.6144% 266284.36
8-A 61246000.00 60874458.03 45677.08 7.5805% 384531.72
M-1 129023000.00 128794219.85 115472.12 6.6075% 708972.68
M-2 107909000.00 107717658.63 96575.66 6.6075% 592952.68
M-3 60992000.00 60883850.61 54586.20 6.6075% 335146.93
M-4 30495000.00 30440927.08 27292.21 6.6075% 167567.97
B-1 21113000.00 21075562.99 18895.57 6.6075% 116014.51
B-2 11728000.00 11707204.22 10496.25 6.6075% 64444.57
B-3 14079705.76 14054740.00 12600.96 6.6075% 77367.03
R 200.00 0.00 0.00 7.5805% 0.00
TOTAL:4691670905.76 4601119093.29 32655939.83 25325374.04
(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 0.00 450.15 209114948.92
1-A-2 0.00 0.00 442.07 208709000.00
2-A-1 0.00 0.00 590.56 250635225.93
2-A-2 0.00 0.00 344.67 147243000.00
3-A-1 0.00 0.00 509.42 576827392.51
3-A-2 0.00 0.00 306.32 350619000.00
4-A-1 0.00 0.00 787.35 146501951.70
4-A-2 0.00 0.00 0.00 108014000.00
5-A-1 0.00 0.00 410.26 304913840.49
5-A-2 0.00 0.00 603.39 469803000.00
5-A-3 0.00 0.00 0.00 200000000.00
6-A-1 0.00 0.00 502.58 429178764.48
6-A-2 0.00 0.00 567.81 490357000.00
6-A-3 0.00 0.00 0.00 200000000.00
7-A 0.00 0.00 45.83 41379004.07
8-A 0.00 0.00 16.19 60828780.95
M-1 0.00 0.00 202.94 128678747.73
M-2 0.00 0.00 169.73 107621082.97
M-3 0.00 0.00 95.93 60829264.41
M-4 0.00 0.00 47.96 30413634.87
B-1 0.00 0.00 33.21 21056667.42
B-2 0.00 0.00 18.45 11696707.97
B-3 0.00 0.00 22.15 14042139.04
R 0.00 0.00 0.00 0.00
TOTAL: 0 0 6166.96 4568463153
AMOUNTS PER $1,000 UNIT
Beginning Ending
Current PrincipaPrincipal Interest Current Principal
Class Cusip Amount Distribution Distribution Amount
1-A-1 22540ANQ7 956.66615142 15.34718853 4.93403059 941.31896289
1-A-2 22540ANR5 1000.00000000 0.00000000 5.15752603 1000.00000000
2-A-1 22540ANS3 981.15848786 6.44374073 4.91782742 974.71474713
2-A-2 22540ANT1 1000.00000000 0.00000000 5.01226605 1000.00000000
3-A-1 22540ANU8 973.31272841 10.46539872 5.18827140 962.84732969
3-A-2 2254A0NV6 1000.00000000 0.00000000 5.33052867 1000.00000000
4-A-1 22540ANW4 936.34850468 6.23643750 5.41298686 930.11206719
4-A-2 100001523 1000.00000000 0.00000000 5.78629168 1000.00000000
5-A-1 22540ANY0 912.66340440 41.48100301 5.11973554 871.18240139
5-A-2 22540ANZ7 1000.00000000 0.00000000 5.60966454 1000.00000000
5-A-3 100001524 1000.00000000 0.00000000 5.61094890 1000.00000000
6-A-1 22540APB8 964.49494956 10.76436182 5.51774731 953.73058773
6-A-2 22540APC6 1000.00000000 0.00000000 5.72086698 1000.00000000
6-A-3 10001525 1000.00000000 0.00000000 5.72202495 1000.00000000
7-A 22540APE2 944.12020322 13.35555265 5.98970601 930.76465056
8-A 22540APF9 993.93361240 0.74579688 6.27847892 993.18781552
M-1 22540APJ1 998.22682661 0.89497314 5.49493256 997.33185347
M-2 22540APK8 998.22682659 0.89497317 5.49493261 997.33185341
M-3 22540APL6 998.22682663 0.89497311 5.49493257 997.33185352
M-4 22540APM4 998.22682669 0.89497327 5.49493246 997.33185342
B-1 100001526 998.22682660 0.89497324 5.49493260 997.33185336
B-2 100001527 998.22682640 0.89497357 5.49493293 997.33185283
B-3 100001528 998.22682658 0.89497325 5.49493262 997.33185333
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
