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): August 21,2000
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 August 21, 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 August 21,2000
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 RepoAugust 21,2000
Washington Mutual Bank, F.A. Mortgage-Backed Pass-Through Certificates
STATEMENT TO CERTIFICATEHOLDERS
Distribution Date: August 21,2000
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 182427728.01 4348361.60 6.1893% 940687.43
1-A-2 208709000.00 208709000.00 0.00 6.1893% 1076206.64
2-A-1 257137000.00 229890521.27 2310148.11 6.0175% 1152401.06
2-A-2 147243000.00 147243000.00 0.00 6.0175% 738103.47
3-A-1 599085000.00 538558178.99 6806119.26 6.3980% 2870801.76
3-A-2 350619000.00 350619000.00 0.00 6.3980% 1868985.89
4-A-1 157510000.00 125181920.87 2158712.97 6.9447% 723936.97
4-A-2 108014000.00 108014000.00 0.00 6.9447% 625100.42
5-A-1 350000000.00 228949558.84 15884460.58 6.7308% 1282199.12
5-A-2 469803000.00 469803000.00 0.00 6.7308% 2631064.21
5-A-3 200000000.00 200000000.00 0.00 6.7308% 1121794.58
6-A-1 450000000.00 377091878.60 12218704.53 6.8674% 2157427.19
6-A-2 490357000.00 490357000.00 0.00 6.8674% 2805442.35
6-A-3 200000000.00 200000000.00 0.00 6.8674% 1144571.99
7-A 44457000.00 36445641.28 1628177.09 7.6076% 231032.02
8-A 61246000.00 58795673.64 331195.49 7.5769% 371223.71
M-1 129023000.00 128089660.14 120835.81 6.6071% 704833.68
M-2 107909000.00 107128396.76 101061.60 6.6071% 589491.00
M-3 60992000.00 60550789.79 57121.74 6.6071% 333190.33
M-4 30495000.00 30274402.13 28559.93 6.6071% 166589.70
B-1 21113000.00 20960270.61 19773.27 6.6071% 115337.22
B-2 11728000.00 11643160.77 10983.80 6.6071% 64068.33
B-3 14079705.76 13977854.52 13186.27 6.6071% 76915.36
R 200.00 0.00 0.00 7.5769% 0.00
TOTAL:4691670905.76 4324710636.22 46037402.05 23791404.43
(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 0.00 225.80 178079366.41
1-A-2 0.00 0.00 258.33 208709000.00
2-A-1 0.00 0.00 405.32 227580373.16
2-A-2 0.00 0.00 259.60 147243000.00
3-A-1 0.00 0.00 619.96 531752059.73
3-A-2 0.00 0.00 403.62 350619000.00
4-A-1 0.00 0.00 517.93 123023207.90
4-A-2 0.00 0.00 0.00 108014000.00
5-A-1 0.00 0.00 1972.76 213065098.26
5-A-2 0.00 0.00 4048.10 469803000.00
5-A-3 0.00 0.00 0.00 200000000.00
6-A-1 0.00 0.00 616.81 364873174.07
6-A-2 0.00 0.00 802.08 490357000.00
6-A-3 0.00 0.00 0.00 200000000.00
7-A 0.00 0.00 22.18 34817464.19
8-A 0.00 0.00 16.20 58464478.15
M-1 0.00 0.00 419.43 127968824.33
M-2 0.00 0.00 350.79 107027335.16
M-3 0.00 0.00 198.27 60493668.05
M-4 0.00 0.00 99.13 30245842.20
B-1 0.00 0.00 68.63 20940497.34
B-2 0.00 0.00 38.13 11632176.97
B-3 0.00 0.00 45.77 13964668.25
R 0.00 0.00 0.00 0.00
TOTAL: 0 0 11388.84 4278673234
AMOUNTS PER $1,000 UNIT
Beginning Ending
Current PrincipaPrincipal Interest Current Principal
Class Cusip Amount Distribution Distribution Amount
1-A-1 22540ANQ7 821.18796679 19.57390064 4.23445058 801.61406615
1-A-2 22540ANR5 1000.00000000 0.00000000 5.15649368 1000.00000000
2-A-1 22540ANS3 894.03905805 8.98411395 4.48166176 885.05494410
2-A-2 22540ANT1 1000.00000000 0.00000000 5.01282553 1000.00000000
3-A-1 22540ANU8 898.96789102 11.36085741 4.79197737 887.60703361
3-A-2 2254A0NV6 1000.00000000 0.00000000 5.33053226 1000.00000000
4-A-1 22540ANW4 794.75538613 13.70524392 4.59613339 781.05014221
4-A-2 100001523 1000.00000000 0.00000000 5.78721666 1000.00000000
5-A-1 22540ANY0 654.14159669 45.38417309 3.66342606 608.75742360
5-A-2 22540ANZ7 1000.00000000 0.00000000 5.60035634 1000.00000000
5-A-3 100001524 1000.00000000 0.00000000 5.60897290 1000.00000000
6-A-1 22540APB8 837.98195244 27.15267673 4.79428264 810.82927571
6-A-2 22540APC6 1000.00000000 0.00000000 5.72122423 1000.00000000
6-A-3 10001525 1000.00000000 0.00000000 5.72285995 1000.00000000
7-A 22540APE2 819.79533662 36.62363835 5.19675237 783.17169827
8-A 22540APF9 959.99205891 5.40762646 6.06119110 954.58443245
M-1 22540APJ1 992.76609705 0.93654472 5.46285301 991.82955233
M-2 22540APK8 992.76609699 0.93654468 5.46285297 991.82955231
M-3 22540APL6 992.76609703 0.93654479 5.46285296 991.82955224
M-4 22540APM4 992.76609707 0.93654468 5.46285284 991.82955239
B-1 100001526 992.76609719 0.93654478 5.46285303 991.82955241
B-2 100001527 992.76609567 0.93654502 5.46285255 991.82955065
B-3 100001528 992.76609599 0.93654443 5.46285279 991.82955156
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
