SEC Form 4
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
or Section 30(h) of the Investment Company Act of 1940
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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
1. Name and Address of Reporting Person*
Baxter Robert

(Last) (First) (Middle)
217 DEVCON DRIVE

(Street)
SAN JOSE CA 95112

(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
SIRF TECHNOLOGY HOLDINGS INC [ SIRF ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director 10% Owner
X Officer (give title below) Other (specify below)
Senior Vice President
3. Date of Earliest Transaction (Month/Day/Year)
02/02/2005
4. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 08/06/2007 A 60,000 A $0 101,000 D
Common Stock 04/29/2008 A 50,000 A $0 151,000 D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year) 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Incentive Stock Option (right to buy) $0.71 02/02/2005 A 161,779 12/01/2005(1) 02/02/2015 Common Stock 161,779 $0 161,779 D
Incentive Stock Option (right to buy) $2.48 01/19/2006 A 42,755 01/19/2007(2) 01/19/2016 Common Stock 42,755 $0 42,755 D
Non-Qualified Stock Option (right to buy) $2.48 01/19/2006 A 111,740 01/19/2007(2) 01/19/2016 Common Stock 111,740 $0 111,740 D
Non-Qualified Stock Option (right to buy) $3.46 05/21/2007 A 38,138 05/21/2008(3) 05/21/2017 Common Stock 38,138 $0 38,138 D
Non-Qualified Stock Option (right to buy) $5.62 04/29/2008 A 50,000 04/29/2009(4) 04/29/2018 Common Stock 50,000 $0 50,000 D
Non-Qualified Stock Option (right to buy) $18.83 08/06/2007 A 60,000 08/06/2008(5) 08/06/2013 Common Stock 60,000 $0 60,000 D
Explanation of Responses:
1. Of such 161,779 shares, 744 shares vested on 9/1/2007 and 32,207 shares vested on 12/1/2007. The remaining 128,828 shares will vest in increments of 32,207 shares on the following dates: 3/1/2008, 6/1/2008, 9/1/2008, and 12/1/2008. Options become exercisable as they vest.
2. When the ISO and NQ grants dated 1/19/2006 totaling 154,495 shares are combined, such shares vest as to 882 shares on 8/19/2007 and monthly thereafter from 8/19/2007 until 1/19/2010 at a rate of 5,297 shares per month. Options become exercisable as they vest.
3. Of such 38,138 shares, vests as to 9,534 shares on 5/21/2008 and monthly thereafter from 5/21/2008 until 5/21/2011. Options become exercisable as they vest.
4. Vests as to 50% on 4/29/2009 and 50% on 4/29/2010
5. Of such 60,000 shares, vests as to 6,000 shares on 8/6/2008, 12,000 shares on 8/6/2009, 18,000 shares on 8/6/2010, and 24,000 shares on 8/6/2011. Options become exercisable as they vest.
By: Philip Lau For: Robert Baxter 05/01/2008
** Signature of Reporting Person Date
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).
** 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 is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.