STAC INC /DE/
SC 13G/A, 1998-04-21
PREPACKAGED SOFTWARE
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<PAGE>   1





                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                  SCHEDULE 13G



                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                               (AMENDMENT NO. 2)*



                                   STAC, INC.
                    -----------------------------------------
                                (Name of Issuer)




                                  COMMON STOCK
                    -----------------------------------------
                         (Title of Class of Securities)




                                   852323 10 4
                    -----------------------------------------
                                 (CUSIP Number)





*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 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).


                             FILED FEBRUARY 11, 1998
                      (REFLECTING OWNERSHIP AS OF 12/31/97)






                              Page 1 of 4 pages
<PAGE>   2




CUSIP NO. 852323 10 4              SCHEDULE 13G        PAGE   2   OF   4   PAGES
         ---------------------                              -----    -----      

  (1)     NAMES OF REPORTING PERSONS                 
          S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS
 
          DOUGLAS L. WHITING
          ---------------------------------------------------------------------

  (2)     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (A)   [   ]
                                                                    (B)   [   ]

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

  (3)     SEC USE ONLY

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

  (4)     CITIZENSHIP OR PLACE OF ORGANIZATION                      

          UNITED STATES
          ---------------------------------------------------------------------

                       (5)     SOLE VOTING POWER                    
  NUMBER OF                    1,549,167
   SHARES              --------------------------------------------------------
 BENEFICIALLY          (6)     SHARED VOTING POWER                  
  OWNED BY                     0
    EACH               --------------------------------------------------------
  REPORTING            (7)     SOLE DISPOSITIVE POWER               
 PERSON WITH                   1,574,166
                       --------------------------------------------------------
                       (8)     SHARED DISPOSITIVE POWER             
                               0
                       --------------------------------------------------------

  (9)     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON         
          1,574,166
          ---------------------------------------------------------------------

 (10)     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
          SHARES*                                                         [   ]

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

 (11)     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9           
          5.74%
          ---------------------------------------------------------------------

 (12)     TYPE OF REPORTING PERSON*
          IN
          ---------------------------------------------------------------------
                    *SEE INSTRUCTIONS BEFORE FILLING OUT!



                              Page 2 of 4 pages
<PAGE>   3




ITEM 1.

(a)     Name of Issuer:  STAC, INC.

(b)     Address of Issuer's Principal Executive Officers:

               12636 HIGH BLUFF DRIVE, 4TH FLOOR
               SAN DIEGO, CA 92130-2093

ITEM 2.

(a)     Name of Person Filing:

               DOUGLAS L. WHITING

(b)     Address of Principal Business Office or, if none, Residence:

               12636 HIGH BLUFF DRIVE
               4TH FLOOR
               SAN DIEGO, CA 92130-2093

(c)     Citizenship:  UNITED STATES

(d)     Title of Class of Securities:  COMMON STOCK

(e)     CUSIP Number:  852323 10 4

ITEM 3. NOT APPLICABLE.

ITEM 4. OWNERSHIP.

(a)     Amount Beneficially Owned: 1,549,167 SHARES, INCLUDING 1,397,500 SHARES
REGISTERED IN THE NAME OF THE WHITING FAMILY TRUST AND 176,666 SHARES ISSUABLE
UPON EXERCISE OF OPTIONS HELD BY MR. WHITING WITHIN 60 DAYS OF DECEMBER 31,
1997.

(b)     Percent of Class:  5.74%

(c)     Number of shares as to which such person has:

        (i)    sole power to vote or to direct the vote:  1,574,166
        (ii)   shared power to vote or to direct the vote:  0
        (iii)  sole power to dispose or to direct the disposition of:  1,574,166
        (iv)   shared power to dispose or to direct the disposition of:  0

ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS

If this statement is being filed to report the fact that as of the date hereof
the reporting person has ceased to be the beneficial owner of more than five
percent of the class of securities, check the following [ ].

ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON

Not applicable.

ITEM 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED
        THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY.



                              Page 3 of 4 pages
<PAGE>   4

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

Not applicable.



                                    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.

                                       February 9, 1997
                                       ----------------------------------------
                                       Date

                                       /s/ Douglas L. Whiting
                                       ----------------------------------------
                                       Signature

                                       Douglas L. Whiting
                                       ----------------------------------------
                                       Name/Title




                              Page 4 of 4 pages


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