SEC 1745
(02-02)


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 control number.

 

 

UNITED STATES

OMB APPROVAL

 

SECURITIES AND EXCHANGE
COMMISSION

OMB Number:
3235-0145

 

Washington, D.C. 20549

Expires: December 31, 2005

 

SCHEDULE 13G

Estimated average burden hours per response. . 11

 

Under the Securities Exchange Act of 1934
(Amendment No. 1)*

 

SEATTLE GENETICS, INC.

(Name of Issuer)

 

COMMON STOCK

(Title of Class of Securities)

 

812578102

(CUSIP Number)

 

DECEMBER 31, 2002

(Date of Event Which Requires Filing of this Statement)

 

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

o

Rule 13d-1(b)

o

Rule 13d-1(c)

ý

Rule 13d-1(d)

 

*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).

 

 

CUSIP No.  812578102

 

 

1.

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

 

 

2.

Check the Appropriate Box if a Member of a Group (See Instructions)

 

 

(a)

o

 

 

(b)

o

 

 

3.

SEC Use Only

 

 

4.

Citizenship or Place of Organization
UNITED STATES

 

 

 

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5.

Sole Voting Power
1,491,500

 

6.

Shared Voting Power

 

7.

Sole Dispositive Power
1,491,500

 

8.

Shared Dispositive Power

 

 

9.

Aggregate Amount Beneficially Owned by Each Reporting Person
1,491,500

 

 

10.

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

 

 

11.

Percent of Class Represented by Amount in Row (9)
4.86%

 

 

12.

Type of Reporting Person (See Instructions)
IN

 

2

 

Item 1.

 

(a)

Name of Issuer
Seattle Genetics, Inc.

 

(b)

Address of Issuer's Principal Executive Offices
21823 – 30th Drive S.E.
Bothell, WA 98021

 

Item 2.

 

(a)

Name of Person Filing
Clay B. Siegall

 

(b)

Address of Principal Business Office or, if none, Residence
21823 – 30th Drive S.E.
Bothell, WA 98021

 

(c)

Citizenship
United States of America

 

(d)

Title of Class of Securities
Common Stock

 

(e)

CUSIP Number
812578102

 

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

 

3

 

Item 4.

Ownership.

Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1.

 

(a)

Amount beneficially owned: 1,491,500

 

(b)

Percent of class: 4.86%

 

(c)

Number of shares as to which the person has:

 

 

(i)

Sole power to vote or to direct the vote 1,491,500

 

 

(ii)

Shared power to vote or to direct the vote   

 

 

(iii)

Sole power to dispose or to direct the disposition of 1,491,500

 

 

(iv)

Shared power to dispose or to direct the disposition of   

 

 

 

 

 

Instruction:  For computations regarding securities which represent a right to acquire an underlying security see Rule 13d–3(d)(1).

 

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 [X].

 

Instruction:  Dissolution of a group requires a response to this item.

 

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

 

Item 10.

Certification

 

 

4

 

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 7, 2003

 

Date

 


/s/ Clay B. Siegall

 

Signature

 

 

 

CLAY B. SIEGALL
PRESIDENT & CEO

 

Name/Title

 

5