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): July 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 July 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 July 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 RepoJuly 19,2000
Washington Mutual Bank, F.A. Mortgage-Backed Pass-Through Certificates
STATEMENT TO CERTIFICATEHOLDERS
Distribution Date: July 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 188159924.20 5732196.19 6.1892% 970091.39
1-A-2 208709000.00 208709000.00 0.00 6.1892% 1076035.75
2-A-1 257137000.00 235368911.75 5478390.48 6.0181% 1180109.07
2-A-2 147243000.00 147243000.00 0.00 6.0181% 738257.23
3-A-1 599085000.00 550259118.42 11700939.43 6.3980% 2933377.66
3-A-2 350619000.00 350619000.00 0.00 6.3980% 1869115.67
4-A-1 157510000.00 130048737.75 4866816.88 6.9446% 752359.93
4-A-2 108014000.00 108014000.00 0.00 6.9446% 625092.59
5-A-1 350000000.00 245962983.20 17013424.36 6.7304% 1377715.54
5-A-2 469803000.00 469803000.00 0.00 6.7304% 2631513.43
5-A-3 200000000.00 200000000.00 0.00 6.7304% 1121732.86
6-A-1 450000000.00 389040883.49 11949004.89 6.8676% 2225386.65
6-A-2 490357000.00 490357000.00 0.00 6.8676% 2804933.80
6-A-3 200000000.00 200000000.00 0.00 6.8676% 1144606.08
7-A 44457000.00 36979277.19 533635.91 7.6065% 234352.84
8-A 61246000.00 59510504.80 714831.16 7.5762% 375702.38
M-1 129023000.00 128209006.03 119345.89 6.6071% 705508.50
M-2 107909000.00 107228212.27 99815.51 6.6071% 590055.39
M-3 60992000.00 60607207.21 56417.42 6.6071% 333509.33
M-4 30495000.00 30302609.91 28207.78 6.6071% 166749.20
B-1 21113000.00 20979800.07 19529.46 6.6071% 115447.64
B-2 11728000.00 11654009.14 10848.37 6.6071% 64129.68
B-3 14079705.76 13990878.21 13023.69 6.6071% 76989.01
R 200.00 0.00 0.00 7.5762% 0.00
TOTAL:4691670905.76 4383047063.64 58336427.42 24112771.61
(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 0.00 380.02 182427728.01
1-A-2 0.00 0.00 421.52 208709000.00
2-A-1 0.00 0.00 290.54 229890521.27
2-A-2 0.00 0.00 181.76 147243000.00
3-A-1 0.00 0.00 416.77 538558178.99
3-A-2 0.00 0.00 265.56 350619000.00
4-A-1 0.00 0.00 250.86 125181920.87
4-A-2 0.00 0.00 0.00 108014000.00
5-A-1 0.00 0.00 1808.27 228949558.84
5-A-2 0.00 0.00 3453.89 469803000.00
5-A-3 0.00 0.00 0.00 200000000.00
6-A-1 0.00 0.00 1106.15 377091878.60
6-A-2 0.00 0.00 1394.21 490357000.00
6-A-3 0.00 0.00 0.00 200000000.00
7-A 0.00 0.00 48.44 36445641.28
8-A 0.00 0.00 18.16 58795673.64
M-1 0.00 0.00 398.56 128089660.14
M-2 0.00 0.00 333.34 107128396.76
M-3 0.00 0.00 188.41 60550789.79
M-4 0.00 0.00 94.20 30274402.13
B-1 0.00 0.00 65.22 20960270.61
B-2 0.00 0.00 36.23 11643160.77
B-3 0.00 0.00 43.49 13977854.52
R 0.00 0.00 0.00 0.00
TOTAL: 0 0 11195.61 4324710636
AMOUNTS PER $1,000 UNIT
Beginning Ending
Current PrincipaPrincipal Interest Current Principal
Class Cusip Amount Distribution Distribution Amount
1-A-1 22540ANQ7 846.99111955 25.80315277 4.36681082 821.18796679
1-A-2 22540ANR5 1000.00000000 0.00000000 5.15567489 1000.00000000
2-A-1 22540ANS3 915.34439521 21.30533715 4.58941759 894.03905805
2-A-2 22540ANT1 1000.00000000 0.00000000 5.01386979 1000.00000000
3-A-1 22540ANU8 918.49924204 19.53135103 4.89642982 898.96789102
3-A-2 2254A0NV6 1000.00000000 0.00000000 5.33090240 1000.00000000
4-A-1 22540ANW4 825.65384896 30.89846283 4.77658517 794.75538613
4-A-2 100001523 1000.00000000 0.00000000 5.78714417 1000.00000000
5-A-1 22540ANY0 702.75138057 48.60978389 3.93633011 654.14159669
5-A-2 22540ANZ7 1000.00000000 0.00000000 5.60131253 1000.00000000
5-A-3 100001524 1000.00000000 0.00000000 5.60866430 1000.00000000
6-A-1 22540APB8 864.53529664 26.55334420 4.94530367 837.98195244
6-A-2 22540APC6 1000.00000000 0.00000000 5.72018713 1000.00000000
6-A-3 10001525 1000.00000000 0.00000000 5.72303040 1000.00000000
7-A 22540APE2 831.79875363 12.00341701 5.27144972 819.79533662
8-A 22540APF9 971.66353395 11.67147504 6.13431702 959.99205891
M-1 22540APJ1 993.69109407 0.92499702 5.46808318 992.76609705
M-2 22540APK8 993.69109407 0.92499708 5.46808319 992.76609699
M-3 22540APL6 993.69109408 0.92499705 5.46808319 992.76609703
M-4 22540APM4 993.69109395 0.92499688 5.46808323 992.76609707
B-1 100001526 993.69109411 0.92499692 5.46808317 992.76609719
B-2 100001527 993.69109311 0.92499744 5.46808331 992.76609567
B-3 100001528 993.69109330 0.92499731 5.46808348 992.76609599
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
