<PAGE>
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
Under the Securities Exchange Act of 1934
(Amendment No. __________)*
Comptek Research
----------------
(Name of Issuer)
8.5% Convertible Debentures
---------------------------
(Title of Class of Securities)
20471210
--------
(CUSIP Number)
May 31, 1999
------------
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which
this Schedule is filed:
[X] Rule 13d-1(b)
[ ] Rule 13d-1(c)
[ ] Rule 13d-1(d)
*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities,
and for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.
The information required on the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).
Page 1 of 4 Pages
<PAGE>
- -------------------- ---------------------
CUSIP No. 20471210 13G Page 2 of 4 Pages
- -------------------- ---------------------
- ---------- --------------------------------------------------------------------
1 NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Warburg Pincus Asset Management, Inc. 13-2673503
- ---------- --------------------------------------------------------------------
2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
(a) [ ]
(b) [ ]
Not applicable
- ---------- --------------------------------------------------------------------
3 SEC USE ONLY
- ---------- --------------------------------------------------------------------
4 CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
- -------------------- ------ ---------------------------------------------------
5 SOLE VOTING POWER
7,000,000*
------ ---------------------------------------------------
NUMBER OF 6 SHARED VOTING POWER
SHARES
BENEFICIALLY 0
OWNED BY
EACH ------ ---------------------------------------------------
REPORTING 7 SOLE DISPOSITIVE POWER
PERSON
WITH 7,000,000*
------ ---------------------------------------------------
8 SHARED DISPOSITIVE POWER
0
- ---------- --------------------------------------------------------------------
9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
7,000,000*
- ---------- --------------------------------------------------------------------
10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
(SEE INSTRUCTIONS)
- ---------- --------------------------------------------------------------------
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
12.5%
- ---------- --------------------------------------------------------------------
12 TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
IA
- ---------- --------------------------------------------------------------------
*Note: Current conversion rate is 9.5. We would own 736,842 common shares if
converted.
<PAGE>
Item 1(a): Name of Issuer:
- --------- ---------------
Comptek Research
Item 1(b): Address of Issuer's Principal Executive Offices:
- --------- ------------------------------------------------
2732 Transit Road
Buffalo, NY 14224
Item 2(a) Name of Person Filing
- -------- ---------------------
Warburg Pincus Asset Management, Inc.
Item 2(b): Address of Principal Business Office:
- --------- -------------------------------------
466 Lexington Avenue, New York, New York 10017
Item 2(c): Citizenship:
- --------- ------------
Delaware
Item 2(d): Title of Class of Securities:
- --------- ----------------------------
Convertible Debenture
Item 2(e): CUSIP Number:
- --------- ------------
20471210
Item 3: If the reporting person is an investment adviser in
- ------ accordance with ss. 240.13d-1(b)(1)(ii)(E), check this
box. [X]
Item 4: Ownership:
- ------- ---------
(a) Amount beneficially owned: 7,000,000*.
(b) Percent of class: 12.5%.
(c) Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote
7,000,000*.
(ii) Shared power to vote or to direct the vote 0.
(iii) Sole power to dispose or to direct the
disposition of 7,000,000*.
(iv) Shared power to dispose or to direct the
disposition of 0.
*Note: Current conversion rate is 9.5. We would own 736,842 common shares if
converted.
Page 3 of 4 Pages
<PAGE>
Item 5: Ownership of Five Percent or Less of a Class:
- ------ --------------------------------------------
Not Applicable
Item 6: Ownership of More than Five Percent on Behalf of Another
- ------ --------------------------------------------------------
Person:
------
Warburg Pincus Asset Management, Inc. ("WPAM") is an
Investment Adviser registered with the United States
Securities and Exchange Commission. WPAM serves as
investment adviser to many accounts including various
registered investment companies. The securities which are
the subject of this report are owned by our accounts. In
this report one or more registered investment companies
owned more than 5%.
Item 7: Identification and Classification of the Subsidiary Which
- ------ ---------------------------------------------------------
Acquired the Security Being Reported on By the Parent
-----------------------------------------------------
Holding Company:
---------------
Not Applicable.
Item 8: Identification and Classification of Members of the Group:
- ------ ---------------------------------------------------------
Not Applicable.
Item 9: Notice of Dissolution of Group:
- ------ ------------------------------
Not Applicable.
Item 10: Certification:
- ------- -------------
By signing below I certify that, to the best of my
knowledge and belief, the securities referred to above
were acquired and are held in the ordinary course of
business and were not acquired and are not held for the
purpose of or with the effect of changing or influencing
the control of the issuer of the securities and were not
acquired and are not held in connection with or as a
participant in any transaction having that purpose or
effect.
SIGNATURE
---------
After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.
Dated: June 3, 1999
By: /s/ Linda S. Iovan
----------------------
Name: Linda S. Iovan
Title: Vice President
Page 4 of 4 Pages
