ZWEIG DIMENNA PARTNERS L P
SC 13D, 1997-07-31
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                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C.  20549
                                 SCHEDULE 13D

                   UNDER THE SECURITIES EXCHANGE ACT OF 1934
                            
                              (AMENDMENT NO.  )
                                            

                              SeaMED Corporation
         -------------------------------------------------------------
                                (Name of Issuer)

                                 Common Stock
              ---------------------------------------------------
                        (Title of Class of Securities)

                                   81218Q100
                   -----------------------------------------
                                 (CUSIP Number)

      Stuart B. Panish c/o Zweig-DiMenna Associates LLC, 900 Third Avenue
                   New York, New York 10022  (212) 451-1100
- --------------------------------------------------------------------------------
(Name, Address and Telephone Number of Person Authorized to Receive Notices and 
Communications)

                                 July 23, 1997
                  -------------------------------------------
            (Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G 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 filing 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 five percent or less of such class.)
(See Rule 13d-7).

Note: Six copies of this statement, including all exhibits, should be filed with
the Commission. See Rule 13d-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 in 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>
 
                                 SCHEDULE 13D

CUSIP No. 81218Q100  


1  NAME OF REPORTING PERSON
   S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        Zweig-DiMenna Special Opportunities, L.P.


2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                 (a) [_]
                                                                     (b) [_]

3  SEC USE ONLY

4 SOURCE OF FUNDS*  WC

5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
  ITEMS  2(d) or 2(e)                                                    [_]    

6  CITIZENSHIP OR PLACE OF ORGANIZATION
    
        Zweig-DiMenna Special Opportunities, L.P. - Delaware


NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH

7  SOLE VOTING POWER
 
        Zweig-DiMenna Special Opportunities, L.P.-285,000

                
8  SHARED VOTING POWER
        
        0                 

9  SOLE DISPOSITIVE POWER
                  
        Zweig-DiMenna Special Opportunities, L.P.-285,000


10  SHARED DISPOSITIVE POWER

        0

11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        Zweig-DiMenna Special Opportunities, L.P.-285,000


12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                          [_]
                
13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
        
        Total-5.5%
        
        Zweig-DiMenna Special Opportunities, L.P.-5.5%


14 TYPE OF REPORTING PERSON*
        
        Zweig-DiMenna Special Opportunities, L.P. - PN

<PAGE>
 
                                 SCHEDULE 13D

ITEM 1  SECURITY AND ISSUER

        SeaMED Corporation
        14500 Northeast 87th Street
        Redmond, Washington 98052
        Common Stock

ITEM 2  IDENTITY AND BACKGROUND

A.      Zweig-DiMenna Special Opportunities, L.P.

        Zweig-DiMenna Special Opportunities, L.P., a Delaware limited
        partnership, is a private investment partnership which seeks
        appreciation of the Partnership's assets for the benefit of its
        partners. The address of its principal business and its principal office
        is 900 Third Avenue, New York, New York 10022. The following information
        is provided as to each general partner of Zweig-DiMenna Special
        Opportunities, L.P.:
 
        1.   Zweig-DiMenna Associates LLC, a New York limited liability company,
        is the managing general partner of Zweig-DiMenna Special Opportunities,
        L.P. Its principal business and office address is 900 Third Avenue, New
        York, New York 10022. Its managing directors are Martin E. Zweig and
        Joseph A. DiMenna, and its principals are Brenda M. Earl, Carol R.
        Whitehead and Jeffrey R. Perry. Dr. Zweig, Mr. DiMenna, Ms. Earl, Ms.
        Whitehead and Mr. Perry are the sole members of Zweig-DiMenna Associates
        LLC. The following information is provided as to each of the above
        mentioned managing directors and principals.

        i)   a)  Name - Martin E. Zweig.

             b)  Residence or Business Address - 900 Third Avenue, New York, New
                 York 10022.
 
             c)  Present Principal Occupation, etc. - Dr. Zweig is Chairman of
                 the Board and President of The Zweig Fund, Inc. and The Zweig
                 Total Return Fund, Inc., each of which is a New York Stock
                 Exchange listed investment company. He is also President of
                 Zweig Advisors Inc., Zweig Total Return Advisors, Inc., Gotham
                 Advisors, Inc., Zweig Associates, Inc., Zweig-DiMenna
                 International Managers, Inc. and Zweig Securities Advisory
                 Service, Inc. He is Chairman of Euclid Advisors LLC. He is
                 President of the Zweig Series Trust mutual fund and Chairman of
                 Zweig/Glaser Advisers, the investment manager of the Zweig
                 Series Trust. Dr. Zweig is a Managing Director of the Managing
                 General Partner of Zweig-DiMenna Partners, L.P. and Zweig-
                 DiMenna Special Opportunities, L.P., 
<PAGE>
 
                 each of which is an investment partnership. The business
                 address of the principal entities referred to above is 900
                 Third Avenue, New York, New York 10022.

             d)  Dr.  Zweig is a citizen of the United States.

        ii)  a)  Name - Joseph A. DiMenna.

             b)  Residence or Business Address - 900 Third Avenue, New York, New
                 York 10022.

             c)  Present Principal Occupation, etc. - Mr. DiMenna is a Managing
                 Director of the Managing General Partner of Zweig-DiMenna
                 Partners, L.P. and Zweig-DiMenna Special Opportunities, L.P.,
                 Executive Vice President and Treasurer of Zweig Associates,
                 Inc., Executive Vice President of Zweig-DiMenna International
                 Managers, Inc. and Vice President of Gotham Advisors, Inc. The
                 business address of the principal entities referred to above is
                 900 Third Avenue, New York, New York 10022.

             d)  Mr. DiMenna is a citizen of the United States.

       iii)  a)  Name - Brenda M. Earl.

             b)  Residence or Business Address - 900 Third Avenue, New York, New
                 York 10022.

             c)  Present Principal Occupation, etc. - Ms. Earl is a Principal of
                 the Managing General Partner of Zweig-DiMenna Partners, L.P.
                 and Zweig-DiMenna Special Opportunities, L.P., Vice President -
                 Research of Zweig Associates, Inc., and Vice President -
                 Research of Zweig-DiMenna International Managers, Inc. The
                 business address of the principal entities referred to above is
                 900 Third Avenue, New York, New York 10022.

             d)  Ms. Earl is a citizen of the United States.

        iv)  a)  Name - Carol R. Whitehead.
    
             b)  Residence or Business Address - 900 Third Avenue, New York, New
                 York 10022.
 
             c)  Present Principal Occupation, etc. - Ms. Whitehead is a
                 Principal of the Managing General Partner of Zweig-DiMenna
                 Partners, L.P. and Zweig-DiMenna Special Opportunities, L.P.,
                 Vice President - Marketing of Zweig Associates, Inc., and Vice
                 President - Business Development of Zweig-DiMenna International
                 Managers, Inc. The business address of the principal entities
                 referred to above is 900 Third Avenue, New York, New York
                 10022.





<PAGE>
 
             d)  Ms. Whitehead is a citizen of the United States.

        v)   a)  Name - Jeffrey R. Perry.

             b)  Residence or Business Address - 900 Third Avenue, New York, New
                 York 10022.

             c)  Present Principal Occupation, etc. - Mr. Perry is a Principal
                 of the Managing General Partner of Zweig-DiMenna Partners, L.P.
                 and Zweig-DiMenna Special Opportunities, L.P., Vice President -
                 Research of Zweig Associates, Inc., and Vice President -
                 Research of Zweig-DiMenna International Managers, Inc. The
                 business address of the principal entities referred to above is
                 900 Third Avenue, New York, New York 10022.

             d)  Mr. Perry is a citizen of the United States.

        2.   Zweig Associates, Inc., a New York corporation, is a general
             partner of Zweig-DiMenna Special Opportunities, L.P. Its principal
             business and office address is 900 Third Avenue, New York, New York
             10022. Martin E. Zweig is President, Joseph A. DiMenna is Executive
             Vice President, Carol R. Whitehead is Vice President - Marketing
             and Brenda M. Earl and Jeffrey R. Perry is each a Vice President -
             Research of Zweig Associates, Inc. Martin E. Zweig, Joseph A.
             DiMenna and Carol Whitehead are the directors and shareholders of
             Zweig Associates, Inc. Reference is made to Item 2.A.1, above, for
             information about such individuals.

             None of the above, i.e., Zweig- DiMenna Special Opportunities,
             L.P., Zweig-DiMenna Associates LLC, Zweig Associates, Inc., Martin
             E. Zweig, Joseph A. DiMenna, Brenda M. Earl, Carol R. Whitehead or
             Jeffrey R. Perry has, during the last five years, (i) been
             convicted in a criminal proceeding (excluding traffic violations or
             similar misdemeanors) or (ii) been a party to a civil proceeding of
             a judicial or administrative body of competent jurisdiction and as
             a result of such proceeding was or is subject to a judgment, decree
             or final order enjoining future violations of, or prohibiting or
             mandating activities subject to, Federal or State securities laws
             or finding any violation with respect to such laws.

ITEM 3  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION

        The securities of SeaMED Corporation were purchased at an aggregate cost
        of $4,931,880 with the investment capital of Zweig-DiMenna Special
        Opportunities, L.P. No part of the purchase price was made up of
        borrowed funds or funds otherwise obtained for the purpose of acquiring,
        holding, trading or voting such securities.
<PAGE>
 
ITEM 4  PURPOSE OF TRANSACTION

        Transactions for the purchase of shares of Common Stock (the "Shares")
        of SeaMED Corporation (the "Company") were executed by Zweig-DiMenna
        Special Opportunities, L.P. (the "Investor") for investment purposes
        only. The Investor continues to evaluate its ownership and voting
        position in the Company and may consider the following future courses of
        action: (i) continuing to hold the Shares for investment; (ii) disposing
        of all or a portion of the Shares in open market sales or in privately
        negotiated transactions; or (iii) acquiring additional shares of common
        stock in the open market or in privately negotiated transactions. The
        Investor has not as yet determined which of the courses of action
        specified in this paragraph it may ultimately take. The Investor's
        future actions with regard to this investment in the Company are
        dependent upon its evaluation of a variety of circumstances affecting
        the Company in the future, including the market price of the Company's
        common stock, the Company's prospects and the Investor's own portfolio.

        Other than as described above, the Investor does not have any present
        plans or proposals which relate to or would result in any of the
        following (although it reserves the right to develop such plans or
        proposals): a) the acquisition by any person of additional securities of
        the Company, or the disposition of securities of the Company; b) an
        extraordinary corporate transaction, such as a merger, reorganization or
        liquidation, involving the Company or any of its subsidiaries; c) a sale
        or transfer of a material amount of assets of the Company or any of its
        subsidiaries; d) any change in the present board of directors or
        management of the Company, including any plans or proposals to change
        the number or term of directors or to fill any existing vacancies on the
        board; e) any material change in the present capitalization or dividend
        policy of the Company; f) any other material change in the Company's
        business or corporate structure; g) changes in the Company's charter, 
        by-laws or instruments corresponding thereto or other actions which may
        impede the acquisition or control of the Company by any person; h)
        causing a class of securities of the Company to be delisted from a
        national securities exchange or to cease to be authorized to be quoted
        in an inter-dealer quotation system of a registered national securities
        association; i) a class of equity securities of the Company becoming
        eligible for termination of registration pursuant to Section 12(g)(4) of
        the Securities Exchange Act of 1934; or j) any action similar to those
        enumerated above.

ITEM 5  INTEREST IN SECURITIES OF THE ISSUER

        a.   Aggregate number of shares beneficially owned:

                Zweig-DiMenna Special Opportunities, L.P.  -   285,000

             Percent of class beneficially owned:

                Zweig-DiMenna Special Opportunities, L.P.  -   5.5%
<PAGE>
 
        b.   Number of shares as to which there is sole power to vote:

                Zweig-DiMenna Special Opportunities, L.P.  -  285,000
 
             Number of shares as to which there is shared power to vote or to
             direct the vote:
          
                Zweig-DiMenna Special Opportunities, L.P.  -  0
 
             Number of shares as to which there is sole power to dispose or to
             direct the disposition:
 
                Zweig-DiMenna Special Opportunities, L.P.  -  285,000
 
             Number of shares as to which there is shared power to dispose or to
             direct the disposition:
 
                Zweig-DiMenna Special Opportunities, L.P.  -  0

        c.   Since May 23, 1997, Zweig-DiMenna Special Opportunities, L.P.
             purchased the Shares on the open market on the following date and
             at the following price and in the following amount:

                ZWEIG-DIMENNA SPECIAL OPPORTUNITIES, L.P.

                DATE        DESCRIPTION OF PURCHASE

                7/23/97      Purchased 70,000 shares at $16.25 a share

        d.      Not applicable.

        e.      Not applicable.

ITEM 6  CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT TO
        SECURITIES OF THE ISSUER

        None.
<PAGE>
 
                                   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.

Date: July 29, 1997

                                 ZWEIG-DiMENNA SPECIAL OPPORTUNITIES, L.P.

                                 By: Zweig-DiMenna Associates LLC,
                                     Managing General Partner

                                 By: /s/ Joseph A. DiMenna
                                     ----------------------------   
                                    Name:  Joseph A. DiMenna
                                    Title: Managing Director of Managing
                                           General Partner


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