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): June 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 June 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 June 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.
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 RepoJune 19,2000
Washington Mutual Bank, FA Mortgage-Backed Pass-Through Certificates
STATEMENT TO CERTIFICATEHOLDERS
Distribution Date: June 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 193423124.01 5263199.81 6.1902% 997490.33
1-A-2 208709000.00 208709000.00 0.00 6.1902% 1076320.18
2-A-1 257137000.00 237314644.19 1945732.44 6.0177% 1189889.74
2-A-2 147243000.00 147243000.00 0.00 6.0177% 738272.74
3-A-1 599085000.00 556024506.58 5765388.16 6.3981% 2964161.07
3-A-2 350619000.00 350619000.00 0.00 6.3981% 1869146.38
4-A-1 157510000.00 134909007.10 4860269.35 6.9446% 780309.25
4-A-2 108014000.00 108014000.00 0.00 6.9446% 625094.95
5-A-1 350000000.00 263248936.54 17285953.34 6.7318% 1476163.60
5-A-2 469803000.00 469803000.00 0.00 6.7318% 2634411.72
5-A-3 200000000.00 200000000.00 0.00 6.7318% 1121963.35
6-A-1 450000000.00 399623419.72 10582536.23 6.8681% 2286214.71
6-A-2 490357000.00 490357000.00 0.00 6.8681% 2805294.52
6-A-3 200000000.00 200000000.00 0.00 6.8681% 1144691.60
7-A 44457000.00 37020422.35 41145.16 7.6065% 234612.05
8-A 61246000.00 59974233.27 463728.47 7.5757% 378592.88
M-1 129023000.00 128327768.14 118762.11 6.6076% 706382.34
M-2 107909000.00 107327539.53 99327.26 6.6076% 590786.24
M-3 60992000.00 60663348.66 56141.45 6.6076% 333922.42
M-4 30495000.00 30330679.72 28069.81 6.6076% 166955.74
B-1 21113000.00 20999234.00 19433.93 6.6076% 115590.64
B-2 11728000.00 11664804.44 10795.30 6.6076% 64209.11
B-3 14079705.76 14003838.19 12959.98 6.6076% 77084.36
R 200.00 0.00 0.00 7.5757% 0.00
TOTAL:4691670905.76 4429600506.43 46553442.80 24377559.92
(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 0.00 286.55 188159924.20
1-A-2 0.00 0.00 309.19 208709000.00
2-A-1 0.00 0.00 185.29 235368911.75
2-A-2 0.00 0.00 114.97 147243000.00
3-A-1 0.00 0.00 402.05 550259118.42
3-A-2 0.00 0.00 253.52 350619000.00
4-A-1 0.00 0.00 431.57 130048737.75
4-A-2 0.00 0.00 0.00 108014000.00
5-A-1 0.00 0.00 614.69 245962983.20
5-A-2 0.00 0.00 1097.01 469803000.00
5-A-3 0.00 0.00 0.00 200000000.00
6-A-1 0.00 0.00 1013.16 389040883.49
6-A-2 0.00 0.00 1243.19 490357000.00
6-A-3 0.00 0.00 0.00 200000000.00
7-A 0.00 0.00 49.86 36979277.19
8-A 0.00 0.00 30.99 59510504.80
M-1 0.00 0.00 233.52 128209006.03
M-2 0.00 0.00 195.30 107228212.27
M-3 0.00 0.00 110.39 60607207.21
M-4 0.00 0.00 55.19 30302609.91
B-1 0.00 0.00 38.21 20979800.07
B-2 0.00 0.00 21.23 11654009.14
B-3 0.00 0.00 25.48 13990878.21
R 0.00 0.00 0.00 0.00
TOTAL: 0 0 6711.36 4383047064
AMOUNTS PER $1,000 UNIT
Beginning Ending
Current PrincipaPrincipal Interest Current Principal
Class Cusip Amount Distribution Distribution Amount
1-A-1 22540ANQ7 870.68311198 23.69199243 4.49014558 846.99111955
1-A-2 22540ANR5 1000.00000000 0.00000000 5.15703769 1000.00000000
2-A-1 22540ANS3 922.91130483 7.56690962 4.62745439 915.34439521
2-A-2 22540ANT1 1000.00000000 0.00000000 5.01397513 1000.00000000
3-A-1 22540ANU8 928.12289839 9.62365634 4.94781387 918.49924204
3-A-2 2254A0NV6 1000.00000000 0.00000000 5.33098999 1000.00000000
4-A-1 22540ANW4 856.51074281 30.85689385 4.95402990 825.65384896
4-A-2 100001523 1000.00000000 0.00000000 5.78716602 1000.00000000
5-A-1 22540ANY0 752.13981869 49.38843811 4.21761029 702.75138057
5-A-2 22540ANZ7 1000.00000000 0.00000000 5.60748169 1000.00000000
5-A-3 100001524 1000.00000000 0.00000000 5.60981675 1000.00000000
6-A-1 22540APB8 888.05204382 23.51674718 5.08047713 864.53529664
6-A-2 22540APC6 1000.00000000 0.00000000 5.72092276 1000.00000000
6-A-3 10001525 1000.00000000 0.00000000 5.72345800 1000.00000000
7-A 22540APE2 832.72425827 0.92550464 5.27728029 831.79875363
8-A 22540APF9 979.23510548 7.57157153 6.18151194 971.66353395
M-1 22540APJ1 994.61156646 0.92047240 5.47485599 993.69109407
M-2 22540APK8 994.61156651 0.92047244 5.47485601 993.69109407
M-3 22540APL6 994.61156643 0.92047236 5.47485608 993.69109408
M-4 22540APM4 994.61156649 0.92047254 5.47485613 993.69109395
B-1 100001526 994.61156633 0.92047222 5.47485615 993.69109411
B-2 100001527 994.61156548 0.92047237 5.47485622 993.69109311
B-3 100001528 994.61156566 0.92047236 5.47485571 993.69109330
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
