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): December 20, 1999
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 December 20, 1999 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 December 20, 1999.
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 Report Dated December 20, 1999
Washington Mutual Bank, FA Mortgage-Backed Pass-Through Certificates
STATEMENT TO CERTIFICATEHOLDERS
Distribution Date: 20-Dec-99
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 222151000.00 4763470.89 6.1911% 1146130.01
1-A-2 208709000.00 208709000.00 0.00 6.1911% 1076779.52
2-A-1 257137000.00 257137000.00 2940695.54 6.0170% 1289330.86
2-A-2 147243000.00 147243000.00 0.00 6.0170% 738302.71
3-A-1 599085000.00 599085000.00 9386682.98 6.3978% 3193999.68
3-A-2 350619000.00 350619000.00 0.00 6.3978% 1869312.33
4-A-1 157510000.00 157510000.00 4072476.07 6.9476% 911928.01
4-A-2 108014000.00 108014000.00 0.00 6.9476% 625363.42
5-A-1 350000000.00 350000000.00 9637746.23 6.7342% 1964136.97
5-A-2 469803000.00 469803000.00 0.00 6.7342% 2636449.83
5-A-3 200000000.00 200000000.00 0.00 6.7342% 1122363.98
6-A-1 450000000.00 450000000.00 7744773.18 6.8672% 2575194.74
6-A-2 490357000.00 490357000.00 0.00 6.8672% 2806143.93
6-A-3 200000000.00 200000000.00 0.00 6.8672% 1144531.00
7-A 44457000.00 44457000.00 380006.51 7.6131% 282047.18
8-A 61246000.00 61246000.00 44250.38 7.5840% 387076.31
M-1 129023000.00 129023000.00 114577.79 6.6081% 710501.71
M-2 107909000.00 107909000.00 95827.68 6.6081% 594231.49
M-3 60992000.00 60992000.00 54163.43 6.6081% 335869.73
M-4 30495000.00 30495000.00 27080.83 6.6081% 167929.36
B-1 21113000.00 21113000.00 18749.22 6.6081% 116264.72
B-2 11728000.00 11728000.00 10414.95 6.6081% 64583.56
B-3 14079705.76 14079705.76 12503.36 6.6081% 77533.89
R 200.00 200.00 200.00 7.5840% 1.26
TOTAL:4691670905.76 4691670905.76 39303619.04 0 25836006.20
(1) Interest Distribution includes Reimbursement of Realized Losses
Realized LossInterest Current Principal
Principal Shortfall Amount
Class 0.00 0.00 217387529.11
1-A-1 0.00 0.00 208709000.00
1-A-2 0.00 0.00 254196304.46
2-A-1 0.00 0.00 147243000.00
2-A-2 0.00 0.00 589698317.02
3-A-1 0.00 0.00 350619000.00
3-A-2 0.00 0.00 153437523.93
4-A-1 0.00 0.00 108014000.00
4-A-2 0.00 0.00 340362253.77
5-A-1 0.00 0.00 469803000.00
5-A-2 0.00 0.00 200000000.00
5-A-3 0.00 0.00 442255226.82
6-A-1 0.00 0.00 490357000.00
6-A-2 0.00 0.00 200000000.00
6-A-3 0.00 0.00 44076993.49
7-A 0.00 0.00 61201749.62
8-A 0.00 0.00 128908422.21
M-1 0.00 0.00 107813172.32
M-2 0.00 0.00 60937836.57
M-3 0.00 0.00 30467919.17
M-4 0.00 0.00 21094250.78
B-1 0.00 0.00 11717585.05
B-2 0.00 0.00 14067202.40
B-3 0.00 0.00 0.00
R 0.00 0.00 4652367286.72
TOTAL:
AMOUNTS PER $1,000 UNIT
Beginning Ending
Current PrincipaPrincipal Interest Current Principal
Class Cusip Amount Distribution Distribution Amount
1-A-1 22540ANQ7 1000.00000000 21.44249132 5.15923858 978.55750868
1-A-2 22540ANR5 1000.00000000 0.00000000 5.15923856 1000.00000000
2-A-1 22540ANS3 1000.00000000 11.43629869 5.01417867 988.56370131
2-A-2 22540ANT1 1000.00000000 0.00000000 5.01417867 1000.00000000
3-A-1 22540ANU8 1000.00000000 15.66836589 5.33146328 984.33163411
3-A-2 2254A0NV6 1000.00000000 0.00000000 5.33146330 1000.00000000
4-A-1 22540ANW4 1000.00000000 25.85534928 5.78965151 974.14465072
4-A-2 100001523 1000.00000000 0.00000000 5.78965153 1000.00000000
5-A-1 22540ANY0 1000.00000000 27.53641781 5.61181991 972.46358219
5-A-2 22540ANZ7 1000.00000000 0.00000000 5.61181991 1000.00000000
5-A-3 100001524 1000.00000000 0.00000000 5.61181990 1000.00000000
6-A-1 22540APB8 1000.00000000 17.21060708 5.72265498 982.78939292
6-A-2 22540APC6 1000.00000000 0.00000000 5.72265498 1000.00000000
6-A-3 10001525 1000.00000000 0.00000000 5.72265500 1000.00000000
7-A 22540APE2 1000.00000000 8.54773177 6.34426929 991.45226823
8-A 22540APF9 1000.00000000 0.72250235 6.32002596 999.27749765
M-1 22540APJ1 1000.00000000 0.88804159 5.50678336 999.11195841
M-2 22540APK8 1000.00000000 0.88804159 5.50678340 999.11195841
M-3 22540APL6 1000.00000000 0.88804155 5.50678335 999.11195845
M-4 22540APM4 1000.00000000 0.88804165 5.50678341 999.11195835
B-1 100001526 1000.00000000 0.88804149 5.50678350 999.11195851
B-2 100001527 1000.00000000 0.88804144 5.50678377 999.11195856
B-3 100001528 1000.00000000 0.88804129 5.50678340 999.11195871
R-1 22540APG7 1000.00000000 1000.00000000 0.63000000 0.00000000
R-2 22540APH5 1000.00000000 1000.00000000 0.63000000 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
