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): September 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 September 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 September 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 RepoSeptember 19, 2000
Washington Mutual Bank, F.A. Mortgage-Backed Pass-Through Certificates
STATEMENT TO CERTIFICATEHOLDERS
Distribution Date: September 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 178079366.41 4408092.39 6.1895% 918301.63
1-A-2 208709000.00 208709000.00 0.00 6.1895% 1076249.42
2-A-1 257137000.00 227580373.16 4648392.70 6.0172% 1140897.19
2-A-2 147243000.00 147243000.00 0.00 6.0172% 738152.95
3-A-1 599085000.00 531752059.73 9734927.26 6.3983% 2834034.23
3-A-2 350619000.00 350619000.00 0.00 6.3983% 1868664.59
4-A-1 157510000.00 123023207.90 3389846.84 6.9441% 710317.01
4-A-2 108014000.00 108014000.00 0.00 6.9441% 625046.44
5-A-1 350000000.00 213065098.26 20251789.46 6.7301% 1192943.46
5-A-2 469803000.00 469803000.00 0.00 6.7301% 2630409.30
5-A-3 200000000.00 200000000.00 0.00 6.7301% 1121685.13
6-A-1 450000000.00 364873174.07 12545035.92 6.8668% 2087357.63
6-A-2 490357000.00 490357000.00 0.00 6.8668% 2805222.46
6-A-3 200000000.00 200000000.00 0.00 6.8668% 1144472.33
7-A 44457000.00 34817464.19 34957.92 7.6083% 220728.97
8-A 61246000.00 58464478.15 377111.18 7.5772% 369154.67
M-1 129023000.00 127968824.33 121611.22 6.6069% 704022.88
M-2 107909000.00 107027335.16 101710.12 6.6069% 588812.88
M-3 60992000.00 60493668.05 57488.29 6.6069% 332807.04
M-4 30495000.00 30245842.20 28743.20 6.6069% 166398.07
B-1 21113000.00 20940497.34 19900.16 6.6069% 115204.53
B-2 11728000.00 11632176.97 11054.28 6.6069% 63994.63
B-3 14079705.76 13964668.25 13270.89 6.6069% 76826.88
R 200.00 0.00 0.00 7.5772% 0.00
TOTAL:4691670905.76 4278673234.17 55743931.83 23531704.32
(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 0.00 220.36 173671274.02
1-A-2 0.00 0.00 258.26 208709000.00
2-A-1 0.00 0.00 272.24 222931980.46
2-A-2 0.00 0.00 176.14 147243000.00
3-A-1 0.00 0.00 1214.35 522017132.47
3-A-2 0.00 0.00 800.70 350619000.00
4-A-1 0.00 0.00 1583.47 119633361.06
4-A-2 0.00 0.00 0.00 108014000.00
5-A-1 0.00 0.00 2016.31 192813308.80
5-A-2 0.00 0.00 4445.91 469803000.00
5-A-3 0.00 0.00 0.00 200000000.00
6-A-1 0.00 0.00 578.64 352328138.15
6-A-2 0.00 0.00 777.64 490357000.00
6-A-3 0.00 0.00 0.00 200000000.00
7-A 0.00 0.00 21.40 34782506.27
8-A 0.00 0.00 10.99 58087366.97
M-1 0.00 0.00 536.59 127847213.11
M-2 0.00 0.00 448.78 106925625.04
M-3 0.00 0.00 253.66 60436179.76
M-4 0.00 0.00 126.82 30217099.00
B-1 0.00 0.00 87.81 20920597.19
B-2 0.00 0.00 48.78 11621122.69
B-3 0.00 0.00 58.56 13951397.36
R 0.00 0.00 0.00 0.00
TOTAL: 0 0 13937.40 4222929302
AMOUNTS PER $1,000 UNIT
Beginning Ending
Current PrincipaPrincipal Interest Current Principal
Class Cusip Amount Distribution Distribution Amount
1-A-1 22540ANQ7 801.61406615 19.84277536 4.13368218 781.77129079
1-A-2 22540ANR5 1000.00000000 0.00000000 5.15669866 1000.00000000
2-A-1 22540ANS3 885.05494410 18.07749449 4.43692347 866.97744961
2-A-2 22540ANT1 1000.00000000 0.00000000 5.01316158 1000.00000000
3-A-1 22540ANU8 887.60703361 16.24965950 4.73060456 871.35737411
3-A-2 2254A0NV6 1000.00000000 0.00000000 5.32961588 1000.00000000
4-A-1 22540ANW4 781.05014221 21.52147064 4.50966294 759.52867158
4-A-2 100001523 1000.00000000 0.00000000 5.78671691 1000.00000000
5-A-1 22540ANY0 608.75742360 57.86225560 3.40840989 550.89516800
5-A-2 22540ANZ7 1000.00000000 0.00000000 5.59896233 1000.00000000
5-A-3 100001524 1000.00000000 0.00000000 5.60842565 1000.00000000
6-A-1 22540APB8 810.82927571 27.87785760 4.63857251 782.95141811
6-A-2 22540APC6 1000.00000000 0.00000000 5.72077580 1000.00000000
6-A-3 10001525 1000.00000000 0.00000000 5.72236165 1000.00000000
7-A 22540APE2 783.17169827 0.78633106 4.96499921 782.38536721
8-A 22540APF9 954.58443245 6.15731934 6.02740865 948.42711312
M-1 22540APJ1 991.82955233 0.94255458 5.45656883 990.88699774
M-2 22540APK8 991.82955231 0.94255456 5.45656878 990.88699775
M-3 22540APL6 991.82955224 0.94255460 5.45656876 990.88699764
M-4 22540APM4 991.82955239 0.94255452 5.45656879 990.88699787
B-1 100001526 991.82955241 0.94255435 5.45656864 990.88699806
B-2 100001527 991.82955065 0.94255457 5.45656845 990.88699608
B-3 100001528 991.82955156 0.94255450 5.45656888 990.88699706
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
