<PAGE>
 
    

<TABLE> 
<S>                     <C>                         <C>             <C> 
Holt Corporate          1,037,910                   0                1,037,910
Stock Marital
Trust--1985

Holt Corporate          1,004,429                   0                1,004,429
Stock Life Trust--
1985

Peter H. Holt           0                             579,800(3)       579,800
Grantor Trust                                         

Benjamin D. Holt,
Jr.--                   3,200,486                   1,000,000(4)     4,200,486
by Oral Proxy                                                       ----------
                                                                    13,175,021
</TABLE>

- --------
(1)  No adjustment has been made for a 1:5 reverse stock split approved at
     Zapata's Annual Meeting of Shareholders held on April 27, 1994.
(2)  Acquired by private purchase from the S Stock GST Trust for Ann Holt on May
     1, 1994 at a price of $1.25 per share. The indicated shares are held in a 
     joint account in the name of Peter M. Holt and his spouse.
(3)  Acquired in open market purchases in December 1993-January 1994.
(4)  Acquired by private purchase 800,000 shares from the S Stock GST Trust for 
     Benjamin D. Holt III on May 16, 1994, and 200,000 shares from the S Stock 
     GST Trust for Ann Holt on May 16, 1994 at a price of $1.25 per share.

Item 6.      Contracts, Arrangements, Understandings or Relationships
             With Respect to Securities of the Issuer.
       
      The Shares of Common Stock acquired by Mr. Holt pursuant to the Merger,
Purchase and Sale Agreement were included in Zapata's Registration Statement on
Form S-1, Registration No. 33-68034, declared effective November 9, 1993, and
pursuant thereto such Common Stock may be offered for sale by Mr. Holt from time
to time.

      Mr. Holt and certain of the selling shareholders under the Merger,
Purchase and Sale Agreement have entered into a Continuity of Interest Agreement
pursuant to which they will agree, for tax purposes, that they will effect only
limited sales of the Common Stock for a period of one year from the date of such
Agreement.

                               Page 5 of 7 Pages