ELECTROMAGNETIC SCIENCES INC
SC 13D/A, 1996-08-22
RADIO & TV BROADCASTING & COMMUNICATIONS EQUIPMENT
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                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D. C. 20549

                                  SCHEDULE l3D

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 18)*

                         ELECTROMAGNETIC SCIENCES, INC.
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                     Common Stock, par value $.10 per share
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    285397105
- --------------------------------------------------------------------------------
                                 (CUSIP Number)

                                                         with a copy to:
David A. Rocker                                      Robert G. Minion, Esq.
Suite 1759                                           Lowenstein, Sandler, Kohl,
45 Rockefeller Plaza                                   Fisher & Boylan, P.A.
New York, New York  10111                            65 Livingston Avenue
(212) 397-1220                                       Roseland, New Jersey  07068
                                                     (201) 992-8700
- --------------------------------------------------------------------------------
                       (Name, Address and Telephone Number
                         of Person Authorized to Receive
                           Notices and Communications)

                                 August 12, 1996
- --------------------------------------------------------------------------------
                      (Date of Event which Requires Filing
                               of this Statement)

If the filing person has previously  filed a statement on Schedule l3G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box [ ].

Check the following  box if a fee is being paid with this  statement [ ]. (A fee
is not required only if the reporting  person:  (1) has a previous  statement on
file  reporting  beneficial  ownership of more than five percent of the class of
securities  described  in Item 1;  and (2) has  filed  no  amendment  subsequent
thereto reporting  beneficial ownership of less than five percent of such class.
See Rule 13d-7.)

Note: Six copies of this statement, including all exhibits, should be filed with
the  Commission.  See Rule l3d-1(a) for other parties to whom copies are to be 
sent.

*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
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).

                               CUSIP NO. 285397105
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
  1)   Names of Reporting Persons (S.S. or I.R.S. Identification Nos. of Above 
       Persons):
                    David A. Rocker ###-##-####

- --------------------------------------------------------------------------------
  2)   Check the Appropriate Box if a Member of a Group (See Instructions):

       (a)       Not
       (b)       Applicable

- --------------------------------------------------------------------------------
       3)  SEC Use Only

- --------------------------------------------------------------------------------
       4)  Source of Funds (See Instructions):WC

- --------------------------------------------------------------------------------
       5)  Check if Disclosure of Legal Proceedings is Required Pursuant to 
           Items 2(d) or 2(e):

                                 Not Applicable

- --------------------------------------------------------------------------------
       6)   Citizenship or Place of Organization:

            United States

- --------------------------------------------------------------------------------
       Number of                7)    Sole Voting Power:                726,652*
       Shares Beneficially            ------------------------------------------
       Owned by                 8)    Shared Voting Power:                     0
       Each Reporting                 ------------------------------------------
       Person   With:           9)    Sole Dispositive Power:           726,652*
                                      ------------------------------------------
                               10)    Shared Dispositive Power:                0
                                      ------------------------------------------

- --------------------------------------------------------------------------------
       11)  Aggregate Amount Beneficially Owned by Each Reporting Person:

            726,652*

- --------------------------------------------------------------------------------
       12)  Check if the Aggregate Amount in Row (11) Excludes Certain Shares 
            (See Instructions):
                                  Not Applicable

- --------------------------------------------------------------------------------
       13)   Percent of Class Represented by Amount in Row
             (11):             9.7%*

- --------------------------------------------------------------------------------
       14)   Type of Reporting Person (See Instructions):           IA, IN

- --------------------------------------------------------------------------------

*    664,046  shares  (8.87%) of  Electromagnetic  Sciences,  Inc.  are owned by
     Rocker  Partners,  L.P.,  a New York  limited  partnership.  62,606  shares
     (0.83%) of  Electromagnetic  Sciences,  Inc. are owned by Compass Holdings,
     Ltd., a corporation  organized under the International  Business  Companies
     Ordinance of the British Virgin Islands. David A. Rocker serves as the sole
     managing  partner of Rocker  Partners,  L.P. and,  through Rocker  Offshore
     Management Company,  Inc., as investment adviser to Compass Holdings,  Ltd.
     See Item 5 for further  information on the  computation of percentages  set
     forth herein.

Item 5.  Interest in Securities of the Issuer.

     Based upon the information  contained in Electromagnetic  Sciences,  Inc.'s
quarterly  report on Form 10-Q for the  quarterly  period  ended June 30,  1996,
there were issued and outstanding 7,482,870 shares of Electromagnetic  Sciences,
Inc. common stock as of July 27, 1996. As of August 12, 1996,  Rocker  Partners,
L.P.  owned 664,046 of such shares,  or 8.87% of those  outstanding  and Compass
Holdings, Ltd. owned 62,606 of such shares, or 0.83% of those outstanding. David
Rocker  possesses sole power to vote and direct the disposition of all shares of
Electromagnetic  Sciences,  Inc. common stock owned by Rocker Partners, L.P. and
Compass  Holdings,  Ltd. The following table details the transactions by each of
Rocker Partners,  L.P. and Compass Holdings,  Ltd. in shares of  Electromagnetic
Sciences, Inc. common stock during the past 60 days: 

                            A. Rocker Partners, L.P.


     Date                    Quantity                                      Price

                                   (Purchases)

June 20, 1996                  1,000                                      $15.25
June 26, 1996                  1,500                                      $13.75
June 26, 1996                  5,000                                      $13.65
June 27, 1996                  5,000                                      $13.62
June 27, 1996                  4,500                                      $13.53
July 1, 1996                   1,850                                      $14.29
July 3, 1996                   3,000                                      $14.06
July 3, 1996                   2,500                                      $14.15
July 9, 1996                   5,000                                      $13.75
July 10, 1996                  1,000                                      $13.62
July 11, 1996                 11,000                                      $12.99
July 11, 1996                  1,000                                      $13.12
July 15, 1996                  5,000                                      $12.31
July 15, 1996                  5,000                                      $11.65
July 16, 1996                  5,000                                      $11.53
July 18, 1996                  2,500                                      $12.06
July 18, 1996                  2,500                                      $12.37
July 18, 1996                  5,000                                      $12.18
July 19, 1996                  2,000                                      $11.68
July 19, 1996                  1,800                                      $11.50
July 22, 1996                  4,000                                      $11.28
July 23, 1996                  3,200                                      $11.64
July 23, 1996                  5,000                                      $11.81
July 24, 1996                  4,000                                      $10.93
July 25, 1996                  3,100                                      $11.25
July 26, 1996                  1,000                                      $11.12
July 29, 1996                  2,700                                      $11.38
July 30, 1996                  1,000                                      $11.62
July 30, 1996                  1,000                                      $11.37
August 1, 1996                 1,000                                      $12.31
August 1, 1996                 4,000                                      $12.25
August 2, 1996                 1,000                                      $13.12

                                     (Sales)

June 14, 1996                  1,000                                      $15.37
June 14, 1996                  8,700                                      $15.39
June 17, 1996                  2,500                                      $15.57
June 28, 1996                  9,000                                      $14.22
July 17, 1996                  5,000                                      $12.87
July 22, 1996                  4,000                                      $11.28
July 23, 1996                 14,000                                      $11.50
July 23, 1996                  3,200                                      $11.64
July 23, 1996                  5,000                                      $11.81
July 24, 1996                  4,000                                      $10.93
July 25, 1996                  3,100                                      $11.25
July 26, 1996                  1,000                                      $11.12
July 29, 1996                  2,700                                      $11.38
July 30, 1996                  1,000                                      $11.62
July 30, 1996                  1,000                                      $11.37
July 30, 1996                  2,800                                      $11.75
August 1, 1996                11,000                                      $12.37
August 2, 1996                18,400                                      $12.91
August 5, 1996                 2,000                                      $13.16
August 6, 1996                13,000                                      $13.24
August 7, 1996                10,000                                      $13.75
August 9, 1996                 3,200                                      $13.50
August 12, 1996               17,500                                      $13.56

                            B. Compass Holdings, Ltd.

     Date                     Quantity                                     Price

                                   (Purchases)

June 19, 1996                    900                                      $15.75
June 20, 1996                  2,500                                      $15.25
June 24, 1996                  2,500                                      $14.37
June 26, 1996                  1,000                                      $13.75
June 28, 1996                    100                                      $14.62
July 8, 1996                     100                                      $14.12
July 11, 1996                  2,500                                      $12.99
July 12, 1996                    100                                      $13.12
July 16, 1996                    900                                      $11.87
July 19, 1996                    500                                      $11.68
July 31, 1996                    300                                      $12.58
August 1, 1996                 2,000                                      $12.25
August 7, 1996                   150                                      $14.00
August 9, 1996                   200                                      $13.75

                                     (Sales)

June 28, 1996                    700                                      $14.22
July 23, 1996                  1,000                                      $11.50
July 31, 1996                  5,600                                      $11.68
August 1, 1996                 9,000                                      $12.37
August 2, 1996                 2,000                                      $12.93

                                    Signature

                After  reasonable  inquiry and to the best of the  undersigned's
knowledge and belief,  the undersigned hereby certifies that the information set
forth in this statement is true, complete and correct.

                                   Dated: August 22, 1996



                                            /s/ David A. Rocker
                                            ------------------------------------
                                            David  A. Rocker, individually,  as 
                                            managing partner of Rocker Partners,
                                            L.P.,  and  as  president of Rocker 
                                            Offshore  Management Company, Inc., 
                                            the  investment adviser  to  Compass
                                            Holdings, Ltd.




ATTENTION:  INTENTIONAL  MISSTATEMENTS  OR  OMISSIONS  OF  FACT  CONSTITUTE 
FEDERAL CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001).




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