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): April 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 April 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 April 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 RepoApril 19,2000
Washington Mutual Bank, FA Mortgage-Backed Pass-Through Certificates
STATEMENT TO CERTIFICATEHOLDERS
Distribution Date: April 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 205950575.23 7528058.40 6.1905% 1061987.81
1-A-2 208709000.00 208709000.00 0.00 6.1905% 1076211.68
2-A-1 257137000.00 248505377.36 6192661.27 6.0176% 1245755.27
2-A-2 147243000.00 147243000.00 0.00 6.0176% 738127.86
3-A-1 599085000.00 568855744.13 6826677.78 6.3981% 3032542.71
3-A-2 350619000.00 350619000.00 0.00 6.3981% 1869133.09
4-A-1 157510000.00 144549286.97 4556764.14 6.9428% 835990.72
4-A-2 108014000.00 108014000.00 0.00 6.9428% 624932.01
5-A-1 350000000.00 292766245.91 16804103.80 6.7325% 1641676.11
5-A-2 469803000.00 469803000.00 0.00 6.7325% 2634403.28
5-A-3 200000000.00 200000000.00 0.00 6.7325% 1122084.56
6-A-1 450000000.00 419349874.07 9695437.25 6.8669% 2398371.88
6-A-2 490357000.00 490357000.00 0.00 6.8669% 2804480.25
6-A-3 200000000.00 200000000.00 0.00 6.8669% 1144487.76
7-A 44457000.00 38920857.91 791139.20 7.6080% 246706.72
8-A 61246000.00 60779720.65 759391.75 7.5805% 383935.86
M-1 129023000.00 128562578.83 116780.77 6.6074% 707599.98
M-2 107909000.00 107523924.56 97670.15 6.6074% 591804.61
M-3 60992000.00 60774348.82 55204.83 6.6074% 334498.02
M-4 30495000.00 30386177.98 27601.51 6.6074% 167243.53
B-1 21113000.00 21037657.83 19109.71 6.6074% 115789.89
B-2 11728000.00 11686148.39 10615.20 6.6074% 64319.79
B-3 14079705.76 14029462.04 12743.77 6.6074% 77217.24
R 200.00 0.00 0.00 7.5805% 0.00
TOTAL:4691670905.76 4528422980.67 53493959.53 24919300.61
(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 0.00 467.29 198422516.83
1-A-2 0.00 0.00 473.55 208709000.00
2-A-1 0.00 0.00 420.28 242312716.09
2-A-2 0.00 0.00 249.02 147243000.00
3-A-1 0.00 0.00 457.30 562029066.35
3-A-2 0.00 0.00 281.86 350619000.00
4-A-1 0.00 0.00 321.94 139992522.83
4-A-2 0.00 0.00 0.00 108014000.00
5-A-1 0.00 0.00 866.31 275962142.11
5-A-2 0.00 0.00 1390.18 469803000.00
5-A-3 0.00 0.00 0.00 200000000.00
6-A-1 0.00 0.00 1332.11 409654436.82
6-A-2 0.00 0.00 1557.67 490357000.00
6-A-3 0.00 0.00 0.00 200000000.00
7-A 0.00 0.00 52.60 38129718.71
8-A 0.00 0.00 12.45 60020328.90
M-1 0.00 0.00 289.79 128445798.06
M-2 0.00 0.00 242.37 107426254.41
M-3 0.00 0.00 136.99 60719143.99
M-4 0.00 0.00 68.49 30358576.47
B-1 0.00 0.00 47.42 21018548.12
B-2 0.00 0.00 26.34 11675533.19
B-3 0.00 0.00 31.62 14016718.27
R 0.00 0.00 0.00 0.00
TOTAL: 0 0 8725.60 4474929021
AMOUNTS PER $1,000 UNIT
Beginning Ending
Current PrincipaPrincipal Interest Current Principal
Class Cusip Amount Distribution Distribution Amount
1-A-1 22540ANQ7 927.07471600 33.88712362 4.78047729 893.18759237
1-A-2 22540ANR5 1000.00000000 0.00000000 5.15651783 1000.00000000
2-A-1 22540ANS3 966.43181402 24.08312017 4.84471418 942.34869385
2-A-2 22540ANT1 1000.00000000 0.00000000 5.01299118 1000.00000000
3-A-1 22540ANU8 949.54095684 11.39517394 5.06195733 938.14578290
3-A-2 2254A0NV6 1000.00000000 0.00000000 5.33095209 1000.00000000
4-A-1 22540ANW4 917.71498298 28.92999898 5.30754060 888.78498399
4-A-2 100001523 1000.00000000 0.00000000 5.78565751 1000.00000000
5-A-1 22540ANY0 836.47498830 48.01172514 4.69050317 788.46326316
5-A-2 22540ANZ7 1000.00000000 0.00000000 5.60746372 1000.00000000
5-A-3 100001524 1000.00000000 0.00000000 5.61042280 1000.00000000
6-A-1 22540APB8 931.88860904 21.54541611 5.32971529 910.34319293
6-A-2 22540APC6 1000.00000000 0.00000000 5.71926219 1000.00000000
6-A-3 10001525 1000.00000000 0.00000000 5.72243880 1000.00000000
7-A 22540APE2 875.47198224 17.79560474 5.54933351 857.67637750
8-A 22540APF9 992.38677865 12.39904239 6.26874996 979.98773626
M-1 22540APJ1 996.43147989 0.90511591 5.48429330 995.52636398
M-2 22540APK8 996.43147986 0.90511588 5.48429333 995.52636397
M-3 22540APL6 996.43147987 0.90511592 5.48429331 995.52636395
M-4 22540APM4 996.43147991 0.90511592 5.48429336 995.52636399
B-1 100001526 996.43147966 0.90511581 5.48429350 995.52636385
B-2 100001527 996.43147937 0.90511596 5.48429298 995.52636340
B-3 100001528 996.43147940 0.90511622 5.48429330 995.52636319
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
