<PAGE>
THIS FILING LISTS SECURITIES HOLDINGS REPORTED
ON THE FORM 13F FILED ON AUGUST 17, 1999
PURSUANT TO A REQUEST FOR
CONFIDENTIAL TREATMENT AND FOR WHICH
CONFIDENTIAL TREATMENT
EXPIRED ON FEBRUARY 16, 2000
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Form 13F
FORM 13F COVER PAGE
Report for the Calendar Year or Quarter Ended: June 30, 1999
Check here if Amendment /X/; Amendment Number: 2
This Amendment (Check only one.): / / is a restatement.
/X/ adds new holdings entries.
Institutional Investment Manager Filing this Report:
Name: Chesapeake Partners Management Co., Inc.
Address: 1829 Reisterstown Road
Suite 220
Baltimore, Maryland 21208
Form 13F File Number: 28-4120
The institutional investment manager filing this report and the person by whom
it is signed hereby represent that the person signing the report is authorized
to submit it, that all information contained herein is true, correct and
complete, and that it is understood that all required items, statements,
schedules, lists, and tables, are considered integral parts of this form.
Person Signing this Report on Behalf of Reporting Manager:
Name: Mark D. Lerner
Title: Vice President
Phone: (410) 602-0195
Signature, Place, and Date of Signing:
/s/ Mark D. Lerner Baltimore, Maryland February 14, 2000
--------------------------- ------------------- ----------------------
[Signature] [City, State] [Date]
Report Type (Check only one.):
/X/ 13F HOLDINGS REPORT. (Check here if all holdings of this reporting manager
are reported in this report.)
// 13F NOTICE. (Check here if no holdings reported are in this report, and
all holdings are reported by other reporting manager(s).)
// 13F COMBINATION REPORT. (Check here if a portion of the holdings for this
reporting manager are reported in this report and a portion are reported
by other reporting manager(s).)
<PAGE>
FORM 13F SUMMARY PAGE
Report Summary:
Number of Other Included Managers: 0
--------
Form 13F Information Table Entry Total: 46
--------
Form 13F Information Table Value Total: $395,454
--------
(thousands)
List of Other Included Managers:
Provide a numbered list of name(s) and Form 13F file number(s) of all
institutional investment managers with respect to which this report is filed,
other than the manager filing this report.
[If there are no entries in this list, state "NONE" and omit the column headings
and list entries.]
None
<PAGE>
FORM 13F INFORMATION TABLE
<TABLE>
<CAPTION>
COLUMN 1 COLUMN 2 COLUMN 3 COLUMN 4 COLUMN 5 COLUMN 6 COLUMN 7 COLUMN 8
- --------------------- ---------------- -------- -------- ------------------------- ---------- -------- ----------------
VALUE SHRS OR SH/ PUT/ INVESTMENT OTHER VOTING
NAME OF ISSUER TITLE OF CLASS CUSIP (x$1000) PRN AMT PRN CALL DISCRETION MANAGERS AUTHORITY
- --------------------- ---------------- -------- -------- ---------- ---- ----- ---------- -------- ----------------
SOLE SHARED NONE
---- ----- ----
<S> <C> <C> <C> <C> <C> <C> <C> <C> <C> <C> <C>
Abacus Direct Common 002553105 15,830 173,000 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Abovenet
Communications Common 003743101 3,634 90,000 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
AHT Corporation Common 00756H108 442 117,800 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Amsouth Bancorp Common 032165102 928 40,000 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Ballard Medical Common 058566100 6,642 284,900 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Big Flower Common 089159107 3,851 120,800 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Cellular Communications
Of Puerto Rico Common 15116N108 7,724 271,000 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Centennial Healthcare Common 150937100 1,314 248,800 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Century
Communications Common 156503104 8,970 195,000 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Chartwell Re Common 16139W109 1,843 97,000 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Cilcorp, Inc. Common 171794100 7,956 127,300 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
DuPont Common 263534109 14,482 212,000 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Everen Capital Common 299761106 349 11,700 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Frontier Corp. Common 35906P105 66,704 1,137,800 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Global Crossing Common G3921A100 213 4,994 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Healthsouth Corp. Common 421924101 2,008 135,000 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Honeywell, Inc. Common 438506107 4,172 36,000 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
King World Common 495667107 9,302 267,200 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Knoll, Inc. Common 498904101 4,039 151,700 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
KTI, Inc. Common 482689205 6,827 479,103 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Lifeline Systems Common 532192101 1,994 103,600 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Macmillan Bloedel Common 554783209 4,907 275,000 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Mattel, Inc. Common 577081102 24,238 927,780 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Caremark, Inc. Common 141705103 44,291 5,905,500 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Nalco Chemical Common 629853102 12,243 236,000 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Outdoor Systems Common 690057104 31,532 863,900 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Pacificorp Common 695114108 1,470 80,000 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Parexel International Common 699462107 6,056 454,900 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Patriot American Common 703353102 1,292 287,047 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Protection One Common 743663304 194 36,000 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Raychem Corp. Common 754603108 4,244 114,700 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Republic
New York Corp. Common 760719104 13,863 203,300 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Saville Systems PLC Common 805174109 10,573 729,200 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Skytel
Communications Common 83087Q104 21,369 1,020,600 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Southwest Gas Corp Common 844895102 1,904 66,500 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Sport-Haley Common 848925103 438 90,900 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
St. Paul Bancorp Common 792848103 510 20,000 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Sugen, Inc. Common 865041107 1,106 37,500 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
TCA Cable TV Common 872241104 11,516 207,500 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Telebanc Financial Common 87925R109 430 11,100 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
The Limited Common 532716107 6,307 139,007 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
United
International Holdings Common 910734102 8,406 124,300 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Varian, Inc. Common 922206107 7,703 570,600 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Westower Corp Common 96121E101 245 10,000 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Winsloew Furniture Common 975377102 6,453 191,900 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
Wyman Gordon Common 983085101 4,940 255,800 SH SOLE SOLE
- -----------------------------------------------------------------------------------------------------------------------------------
</TABLE>
