<PAGE>
                                     FORM 4

                UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                  STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

    Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934,
       Section 17(a) of the Public Utility Holding Company Act of 1935 or
               Section 30(f) of the Investment Company Act of 1940

[_]  Check this box if no longer subject to Section 16. Form 4 or Form 5
     obligations may continue. See Instruction 1(b).

     (Print or Type Responses)

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1.   Name and Address of Reporting Person*

     ACNielsen Corporation
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   (Last)                           (First)             (Middle)

     770 Broadway
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                                    (Street)

     New York  NY  10003
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   (City)                           (State)              (Zip)

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2.   Issuer Name and Ticker or Trading Symbol

     NetRatings, Inc. (NTRT)
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________________________________________________________________________________
3.   IRS or Social Security Number of Reporting Person, if an entity (Voluntary)

________________________________________________________________________________
4.   Statement for Month/Year

     May 2002
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5.   If Amendment, Date of Original (Month/Year)

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6.   Relationship of Reporting Person(s) to Issuer
     (Check all applicable)

     [_]  Director                             [X]  10% Owner
     [_]  Officer (give title below)           [_]  Other (specify below)


________________________________________________________________________________
7.   Individual or Joint/Group Filing (Check Applicable Line)

     [X]  Form filed by One Reporting Person
     [_]  Form filed by More than One Reporting Person
________________________________________________________________________________

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           Table I -- Non-Derivative Securities Acquired, Disposed of,
                             or Beneficially Owned
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<TABLE>
<CAPTION>
                                                                                                                6.
                                                                 4.                              5.             Owner-
                                                                 Securities Acquired (A) or      Amount of      ship
                                                    3.           Disposed of (D)                 Securities     Form:     7.
                                                    Transaction  (Instr. 3, 4 and 5)             Beneficially   Direct    Nature of
                                   2.               Code         ------------------------------- Owned at End   (D) or    Indirect
1.                                 Transaction      (Instr. 8)                   (A)             of Month       Indirect  Beneficial
Title of Security                  Date             ------------     Amount      or     Price    (Instr. 3      (I)       Ownership
(Instr. 3)                        (Month/Day/Year)   Code     V                  (D)             and 4)         (Instr.4) (Instr. 4)
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<S>                               <C>                <C>      <C>    <C>         <C>    <C>      <C>            <C>       <C>

 Common Stock                     5/7/02             J(1)            749,341      A      (1)     2,745,569       D
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</TABLE>

Reminder: Report on a separate line for each class of securities beneficially
          owned directly or indirectly.

*  If the form is filed by more than one reporting person, see Instruction
   4(b)(v).

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<PAGE>
FORM 4 (continued)

Table II -- Derivative Securities Acquired, Disposed of, or Beneficially Owned
         (e.g., puts, calls, warrants, options, convertible securities)

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<TABLE>
<CAPTION>
                                                                                                                    10.
                                                                                                          9.        Owner-
                                                                                                          Number    ship
                                                                                                          of        Form
                    2.                                                                                    Deriv-    of
                    Conver-                    5.                              7.                         ative     Deriv-   11.
                    sion                       Number of                       Title and Amount           Secur-    ative    Nature
                    or                         Derivative    6.                of Underlying     8.       ities     Secur-   of
                    Exer-             4.       Securities    Date              Securities        Price    Bene-     ity:     In-
                    cise     3.       Trans-   Acquired (A)  Exercisable and   (Instr. 3 and 4)  of       ficially  Direct   direct
                    Price    Trans-   action   or Disposed   Expiration Date   ----------------  Deriv-   Owned     (D) or   Bene-
1.                  of       action   Code     of(D)         (Month/Day/Year)            Amount  ative    at End    In-      ficial
Title of            Deriv-   Date     (Instr.  (Instr. 3,    ----------------            or      Secur-   of        direct   Owner-
Derivative          ative    (Month/  8)       4 and 5)      Date     Expira-            Number  ity      Month     (I)      ship
Security            Secur-   Day/     ------   ------------  Exer-    tion               of      (Instr.  (Instr.   (Instr.  (Instr.
(Instr. 3)          ity      Year)    Code V    (A)   (D)    cisable  Date     Title     Shares  5)       4)        4)       4)
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<S>                 <C>      <C>      <C>  <C>  <C>   <C>    <C>      <C>      <C>       <C>     <C>      <C>       <C>      <C>


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Explanation of Responses:
(1) On May 7, 2002, ACNielsen Corporation ("ACNielsen") exchanged all of the shares of Class A Preferred Stock of ACNielsen
eRatings.com ("eRatings") held by ACNielsen for 749,341 shares of Common Stock of NetRatings, Inc (the "Issuer") pursuant to an
Agreement and Plan of Reorganization, dated May 7, 2002, among the Issuer, Estancia Acquisition Corporation, a wholly owned
subsidiary of the Issuer, eRatings and ACNielsen.
</TABLE>


/s/   /s/ Michael Elias                                      June 7, 2002
---------------------------------------------            -----------------------
      **Signature of Reporting Person                             Date


**  Intentional misstatements or omissions of facts constitute Federal
    Criminal Violations.  See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note:  File three copies of this Form, one of which must be manually signed.
       If space provided is insufficient, see Instruction 6 for procedure.

Potential persons who are to respond to the collection of information
contained in this form are not required to respond unless the form displays a
currently valid OMB Number.

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