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): March 20, 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 March 20, 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 March 20, 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 RepoMarch 20, 2000
Washington Mutual Bank, FA Mortgage-Backed Pass-Through Certificates
STATEMENT TO CERTIFICATEHOLDERS
Distribution Date: March 20, 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 209114948.92 3164373.69 6.1914% 1078779.99
1-A-2 208709000.00 208709000.00 0.00 6.1914% 1076685.79
2-A-1 257137000.00 250635225.93 2129848.57 6.0176% 1256387.50
2-A-2 147243000.00 147243000.00 0.00 6.0176% 738101.62
3-A-1 599085000.00 576827392.51 7971648.38 6.3979% 3074923.19
3-A-2 350619000.00 350619000.00 0.00 6.3979% 1869062.57
4-A-1 157510000.00 146501951.70 1952664.73 6.9428% 846097.60
4-A-2 108014000.00 108014000.00 0.00 6.9428% 624929.60
5-A-1 350000000.00 304913840.49 12147594.58 6.7332% 1709396.33
5-A-2 469803000.00 469803000.00 0.00 6.7332% 2633791.64
5-A-3 200000000.00 200000000.00 0.00 6.7332% 1122196.16
6-A-1 450000000.00 429178764.48 9828890.41 6.8668% 2455284.32
6-A-2 490357000.00 490357000.00 0.00 6.8668% 2805278.25
6-A-3 200000000.00 200000000.00 0.00 6.8668% 1144460.51
7-A 44457000.00 41379004.07 2458146.16 7.6154% 262543.91
8-A 61246000.00 60828780.95 49060.30 7.5805% 384226.37
M-1 129023000.00 128678747.73 116168.90 6.6076% 708218.12
M-2 107909000.00 107621082.97 97158.41 6.6076% 592321.60
M-3 60992000.00 60829264.41 54915.59 6.6076% 334790.23
M-4 30495000.00 30413634.87 27456.89 6.6076% 167389.62
B-1 21113000.00 21056667.42 19009.59 6.6076% 115891.03
B-2 11728000.00 11696707.97 10559.58 6.6076% 64375.98
B-3 14079705.76 14042139.04 12677.00 6.6076% 77284.69
R 200.00 0.00 0.00 7.5805% 0.00
TOTAL:4691670905.76 4568463153.46 40040172.79 25142416.64
(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 0.00 142.75 205950575.23
1-A-2 0.00 0.00 142.47 208709000.00
2-A-1 0.00 0.00 454.47 248505377.36
2-A-2 0.00 0.00 266.99 147243000.00
3-A-1 0.00 0.00 486.95 568855744.13
3-A-2 0.00 0.00 295.99 350619000.00
4-A-1 0.00 0.00 1509.25 144549286.97
4-A-2 0.00 0.00 0.00 108014000.00
5-A-1 0.00 0.00 1469.37 292766245.91
5-A-2 0.00 0.00 2263.96 469803000.00
5-A-3 0.00 0.00 0.00 200000000.00
6-A-1 0.00 0.00 606.42 419349874.07
6-A-2 0.00 0.00 692.86 490357000.00
6-A-3 0.00 0.00 0.00 200000000.00
7-A 0.00 0.00 54.27 38920857.91
8-A 0.00 0.00 33.21 60779720.65
M-1 0.00 0.00 333.34 128562578.83
M-2 0.00 0.00 278.79 107523924.56
M-3 0.00 0.00 157.58 60774348.82
M-4 0.00 0.00 78.79 30386177.98
B-1 0.00 0.00 54.55 21037657.83
B-2 0.00 0.00 30.30 11686148.39
B-3 0.00 0.00 36.38 14029462.04
R 0.00 0.00 0.00 0.00
TOTAL: 0 0 9388.67 4528422981
AMOUNTS PER $1,000 UNIT
Beginning Ending
Current PrincipaPrincipal Interest Current Principal
Class Cusip Amount Distribution Distribution Amount
1-A-1 22540ANQ7 941.31896289 14.24424689 4.85606632 927.07471600
1-A-2 22540ANR5 1000.00000000 0.00000000 5.15878946 1000.00000000
2-A-1 22540ANS3 974.71474713 8.28293311 4.88606268 966.43181402
2-A-2 22540ANT1 1000.00000000 0.00000000 5.01281297 1000.00000000
3-A-1 22540ANU8 962.84732969 13.30637285 5.13269935 949.54095684
3-A-2 2254A0NV6 1000.00000000 0.00000000 5.33075096 1000.00000000
4-A-1 22540ANW4 930.11206719 12.39708421 5.37170719 917.71498298
4-A-2 100001523 1000.00000000 0.00000000 5.78563520 1000.00000000
5-A-1 22540ANY0 871.18240139 34.70741309 4.88398951 836.47498830
5-A-2 22540ANZ7 1000.00000000 0.00000000 5.60616182 1000.00000000
5-A-3 100001524 1000.00000000 0.00000000 5.61098080 1000.00000000
6-A-1 22540APB8 953.73058773 21.84197869 5.45618738 931.88860904
6-A-2 22540APC6 1000.00000000 0.00000000 5.72088958 1000.00000000
6-A-3 10001525 1000.00000000 0.00000000 5.72230255 1000.00000000
7-A 22540APE2 930.76465056 55.29266832 5.90556965 875.47198224
8-A 22540APF9 993.18781552 0.80103687 6.27349329 992.38677865
M-1 22540APJ1 997.33185347 0.90037358 5.48908429 996.43147989
M-2 22540APK8 997.33185341 0.90037356 5.48908433 996.43147986
M-3 22540APL6 997.33185352 0.90037366 5.48908437 996.43147987
M-4 22540APM4 997.33185342 0.90037350 5.48908426 996.43147991
B-1 100001526 997.33185336 0.90037370 5.48908414 996.43147966
B-2 100001527 997.33185283 0.90037347 5.48908425 996.43147937
B-3 100001528 997.33185333 0.90037393 5.48908448 996.43147940
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
