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): January 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 January 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 January 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 RepoJanuary 19, 2000
Washington Mutual Bank, FA Mortgage-Backed Pass-Through Certificates
STATEMENT TO CERTIFICATEHOLDERS
Distribution Date: January 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 217387529.11 4863186.91 6.1915% 1121141.71
1-A-2 208709000.00 208709000.00 0.00 6.1915% 1076383.57
2-A-1 257137000.00 254196304.46 1904154.37 6.0175% 1274396.94
2-A-2 147243000.00 147243000.00 0.00 6.0175% 738193.38
3-A-1 599085000.00 589698317.02 6601261.12 6.3978% 3142794.97
3-A-2 350619000.00 350619000.00 0.00 6.3978% 1868622.65
4-A-1 157510000.00 153437523.93 5953270.96 6.9453% 887374.88
4-A-2 108014000.00 108014000.00 0.00 6.9453% 625162.28
5-A-1 350000000.00 340362253.77 20930062.22 6.7336% 1907179.21
5-A-2 469803000.00 469803000.00 0.00 6.7336% 2632484.95
5-A-3 200000000.00 200000000.00 0.00 6.7336% 1122264.07
6-A-1 450000000.00 442255226.82 8232499.51 6.8668% 2528224.33
6-A-2 490357000.00 490357000.00 0.00 6.8668% 2803205.98
6-A-3 200000000.00 200000000.00 0.00 6.8668% 1144459.19
7-A 44457000.00 44076993.49 2104241.61 7.6144% 279530.26
8-A 61246000.00 61201749.62 327291.60 7.5840% 386557.56
M-1 129023000.00 128908422.21 114202.36 6.6079% 709261.55
M-2 107909000.00 107813172.32 95513.69 6.6079% 593194.27
M-3 60992000.00 60937836.57 53985.96 6.6079% 335283.48
M-4 30495000.00 30467919.17 26992.09 6.6079% 167636.24
B-1 21113000.00 21094250.78 18687.79 6.6079% 116061.78
B-2 11728000.00 11717585.05 10380.83 6.6079% 64470.82
B-3 14079705.76 14067202.40 12462.40 6.6079% 77398.55
R 200.00 0.00 0.00 7.5840% 0.00
TOTAL:4691670905.76 4652367286.72 51248193.43 25601282.63
(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 0.00 488.38 212524342.20
1-A-2 0.00 0.00 468.89 208709000.00
2-A-1 0.00 0.00 293.74 252292150.09
2-A-2 0.00 0.00 170.15 147243000.00
3-A-1 0.00 0.00 1187.36 583097055.90
3-A-2 0.00 0.00 705.97 350619000.00
4-A-1 0.00 0.00 689.19 147484252.97
4-A-2 0.00 0.00 0.00 108014000.00
5-A-1 0.00 0.00 2702.44 319432191.54
5-A-2 0.00 0.00 3730.19 469803000.00
5-A-3 0.00 0.00 0.00 200000000.00
6-A-1 0.00 0.00 2490.97 434022727.30
6-A-2 0.00 0.00 2761.90 490357000.00
6-A-3 0.00 0.00 0.00 200000000.00
7-A 0.00 0.00 154.24 41972751.87
8-A 0.00 0.00 239.20 60874458.03
M-1 0.00 0.00 581.04 128794219.85
M-2 0.00 0.00 485.96 107717658.63
M-3 0.00 0.00 274.67 60883850.61
M-4 0.00 0.00 137.33 30440927.08
B-1 0.00 0.00 95.08 21075562.99
B-2 0.00 0.00 52.82 11707204.22
B-3 0.00 0.00 63.41 14054740.00
R 0.00 0.00 0.00 0.00
TOTAL: 0 0 17772.92 4601119093
AMOUNTS PER $1,000 UNIT
Beginning Ending
Current PrincipaPrincipal Interest Current Principal
Class Cusip Amount Distribution Distribution Amount
1-A-1 22540ANQ7 978.55750868 21.89135726 5.04675518 956.66615142
1-A-2 22540ANR5 1000.00000000 0.00000000 5.15734142 1000.00000000
2-A-1 22540ANS3 988.56370131 7.40521345 4.95610099 981.15848786
2-A-2 22540ANT1 1000.00000000 0.00000000 5.01343616 1000.00000000
3-A-1 22540ANU8 984.33163411 11.01890570 5.24599175 973.31272841
3-A-2 2254A0NV6 1000.00000000 0.00000000 5.32949626 1000.00000000
4-A-1 22540ANW4 974.14465072 37.79614604 5.63376852 936.34850468
4-A-2 100001523 1000.00000000 0.00000000 5.78778936 1000.00000000
5-A-1 22540ANY0 972.46358219 59.80017778 5.44908346 912.66340440
5-A-2 22540ANZ7 1000.00000000 0.00000000 5.60338046 1000.00000000
5-A-3 100001524 1000.00000000 0.00000000 5.61132035 1000.00000000
6-A-1 22540APB8 982.78939292 18.29444336 5.61827629 964.49494956
6-A-2 22540APC6 1000.00000000 0.00000000 5.71666353 1000.00000000
6-A-3 10001525 1000.00000000 0.00000000 5.72229595 1000.00000000
7-A 22540APE2 991.45226823 47.33206501 6.28765459 944.12020322
8-A 22540APF9 999.27749765 5.34388525 6.31155602 993.93361240
M-1 22540APJ1 999.11195841 0.88513180 5.49717143 998.22682661
M-2 22540APK8 999.11195841 0.88513182 5.49717145 998.22682659
M-3 22540APL6 999.11195845 0.88513182 5.49717142 998.22682663
M-4 22540APM4 999.11195835 0.88513166 5.49717131 998.22682669
B-1 100001526 999.11195851 0.88513191 5.49717141 998.22682660
B-2 100001527 999.11195856 0.88513216 5.49717124 998.22682640
B-3 100001528 999.11195871 0.88513213 5.49717124 998.22682658
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
