QuickLinks -- Click here to rapidly navigate through this document

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G/A*
(Rule 13d-102)

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1(b)(c),
AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(b)
(Amendment No. 1)1


DELTAGEN, INC.

(Name of Issuer)

COMMON STOCK, $0.001 PAR VALUE

(Title of Class of Securities)

 

 

24783R103

 

 
   
(CUSIP Number)
   

MARCH 14, 2003

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which the Schedule is filed:

        o      Rule 13d-1(b)

        ý      Rule 13d-1(c)

        o      Rule 13d-1(d)

*This Schedule 13G/A amends the Schedule 13G filed on February 21, 2002.

1 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).



SCHEDULE 13G/A

        CUSIP No.    24783R103                                         Page 2 of 5 Pages


1.   Names of Reporting Persons.
I.R.S. Identification Nos. of above persons (entities only).

 

 

BRISTOL-MYERS SQUIBB COMPANY
I.R.S. Employer Identification Number: 22-079-0350

 

 

 

 

 

 

 

 

 

2.   Check the Appropriate Box if a Member   (a)   o
    of a Group (See Instructions)   (b)   ý


3.   SEC Use Only

 

 

 

 

 

 

 

4.   Citizenship or Place of Organization

 

 

Delaware

 

 

 

 

Number of Shares Beneficially Owned by Each Reporting Person With:   5.   Sole Voting Power

 

 

 

 

 

 

847,481
       
        6.   Shared Voting Power

 

 

 

 

 

 

0
       
        7.   Sole Dispositive Power

 

 

 

 

 

 

847,481
       
        8.   Shared Dispositive Power

 

 

 

 

 

 

0

9.   Aggregate Amount Beneficially Owned by Each Reporting Person

 

 

847,481

10.   Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)    o

 

 

 

 

 

 

 

11.   Percent of Class Represented by Amount in Row (11)

 

 

2.1%

 

 

 

 

12.   Type of Reporting Person (See Instructions)

 

 

CO

 

 

 

 


CUSIP No.    24783R103                                         Page 3 of 5 Pages

This Amendment No. 1 is being filed to amend Items 4 and 5 of this Schedule 13G.

Item 1.

(a)   Name of Issuer

 

 

Deltagen, Inc.
   
(b)   Address of Issuer's Principal Executive Offices

 

 

740 Bay Road
Redwood City, California 94063
   

Item 2.

(a)   Name of Person Filing

 

 

Bristol-Myers Squibb Company
   
(b)   Address of Principal Business Office or, if none, Residence

 

 

345 Park Avenue
New York, NY 10154
   
(c)   Citizenship

 

 

Delaware
   
(d)   Title of Class of Securities

 

 

Common Stock, $0.001 Par Value
   
(e)   CUSIP Number

 

 

24783R103
   
Item 3. If this statement is filed pursuant to §§240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:

 

Not Applicable.

CUSIP No.    24783R103                                                 Page 4 of 5 Pages

Item 4. Ownership

(a)   Amount beneficially owned:

 

 

 

 

847,481
       
(b)   Percent of class:
        2.1%
       
(c)   Number of shares as to which the person has:
         
    (i)   Sole power to vote or to direct the vote

 

 

 

 

847,481
       
    (ii)   Shared power to dispose or to direct the disposition of

 

 

 

 

 
        0
       
    (iii)   Sole power to dispose or to direct the disposition of

 

 

 

 

847,481
       
    (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 ý.

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 or Control Person.

        Not Applicable.


Item 8. Identification and Classification of Members of the Group

         Not Applicable.


Item 9. Notice of Dissolution of Group

         Not Applicable.


CUSIP No.    24783R103                                         Page 5 of 5 Pages

Item 10. Certification

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.


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.

Dated: April 3, 2003

    BRISTOL-MYERS SQUIBB COMPANY

 

 

By:

/s/  
SANDRA LEUNG      
Sandra Leung
Secretary



QuickLinks

SCHEDULE 13G/A
SIGNATURE