<PAGE>
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Form 13F
FORM 13F COVER PAGE
Report for the Calendar Year or Quarter Ended: December 31, 1999
Check here if Amendment: [ ]; Amendment Number: ------------------
This Amendment (Check only one): [ ] is a restatement.
[ ] adds new holding entries.
Institutional Investment Manager Filing this Report:
Name: Forstmann-Leff International, LLC
Address: One World Financial Center, Tower A
New York, New York 10281
Form 13F File Number: 28-6824
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: Philip Silverman
Title: Secretary
Phone: (212) 693-7000
Signature, Place, and Date of Signing:
/s/ Philip Silverman New York, NY ----------------
[Signature] [City, State] [Date]
<PAGE>
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 managers(s).)
<PAGE>
FORM 13F SUMMARY PAGE
Report Summary:
Number of Other Included Managers: 0
----------
Form 13F Information Table Entry Total:
----------
Form 13F Information Table Value Total: $
----------
(thousands)
List of Other Included Managers:
Provide a numbered list of the name(s) and 13F file numbers of all institutional
investment managers with respect to which this report is filed, other than the
one filing this report.
None
<PAGE>
FORM 13F INFORMATION TABLE
Page 1
Form 13F
Reporting Manager: Forstmann-Leff International, LLC
Quarter Ending December 31, 1999
<TABLE>
<CAPTION>
Item 1 Item 2 Item 3 Item 4 Item 5 Item 7 Item 8
------ ------ ------ ------ ------ ------ ------
Title Fair Shares or
Name of of Market Principal Sh/ Put/ Investment Discretion Other Voting Authority
Issuer Class CUSIP Value Amount Prn Call ------------------------------------------------
(x 1000) Sole Shared Other Sole Shared None
- ------------------------------------------------------------------------------------------------------------------------------------
<S> <C> <C> <C> <C> <C> <C> <C> <C> <C> <C> <C> <C> <C>
Ace Ltd. COMMON G0070K103 30744382.5 1842360 SH 1842360 1842360
Actel Corp. COMMON 004934105 1388568 57857 SH 57857 57857
Advo Inc. COMMON 007585102 1498838.75 63109 SH 63109 63109
Axys Pharmaceuticals Inc. COMMON 054635107 44354.37 10918 SH 10918 10918
Cabletron Systems, Inc. COMMON 126920107 347880 13380 SH 13380 13380
Caribiner International Inc. COMMON 141888107 42079 11608 SH 11608 11608
Chelsea GCA Realty Inc. COMMON 163262108 239071 8036 SH 8036 8036
Creative Biomolecules Inc. COMMON 225270107 130804.25 26492 SH 26492 26492
Critical Path, Inc. COMMON 22674V100 221686.87 2349 SH 2349 2349
Cubist Pharmaceuticals Inc. COMMON 229678107 649918.5 33762 SH 33762 33762
Encad Inc. COMMON 292503109 129151.12 27012 SH 27012 27012
Equity Office Properties
Trust COMMON 294741103 12696748.5 515604 SH 515604 515604
First Data Corp. COMMON 319963104 1718442 34848 SH 34848 34848
Gilead Sciences Inc. COMMON 375558103 510290.5 9428 SH 9428 9428
Health Management Assoc.
Inc. (Class A) COMMON 421933102 1296920.25 96966 SH 96966 96966
HealthPlan Services Corp. COMMON 421959107 51933 14838 SH 14838 14838
Industrie-Matematik
International Corp. COMMON 455792101 71099 11608 SH 11608 11608
Intermedia Communications
Inc. COMMON 458801107 1611417.37 41518 SH 41518 41518
Lennar Corp. COMMON 526057104 235787.5 14510 SH 14510 14510
MBIA, Inc. COMMON 55262C100 941910.94 17835 SH 17835 17835
Mattel, Inc. COMMON 577081102 430657.5 32812 SH 32812 32812
Mellon Financial Corp. COMMON 58551A108 9427273.75 276764 SH 276764 276764
Newfield Exploration Co. COMMON 651290108 978140.5 36566 SH 36566 36566
Nova Corp. GA COMMON 669784100 1624269.37 51462 SH 51462 51462
Quest Education Corp. COMMON 74835F102 223912.5 25590 SH 25590 25590
Qwest Communications Intl
Inc. COMMON 749121109 9858438 229266 SH 229266 229266
Renaissancere Holdings Ltd. COMMON G7496G103 553570.12 13543 SH 13543 13543
Strategic Diagnostics Inc. COMMON 862700101 106962.19 16299 SH 16299 16299
Transkaryotic Therapies Inc. COMMON 893735100 640062.5 16625 SH 16625 16625
Veritas Software Corp. COMMON 923436109 10734375 75000 SH 75000 75000
Viasoft. Inc. COMMON 92552U102 271782.87 47786 SH 47786 47786
------------------------------------------------------------------------
GRAND TOTAL 89420728 3675751 3675751 3675751
========================================================================
</TABLE>