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*
LANSDOWNE PARTNERS LIMITED PARTNERSHIP

(Last) (First) (Middle)
15 DAVIES STREET

(Street)
LONDON X0 W1K 3AG

(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
RESPONSE GENETICS INC [ RGDX ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director X 10% Owner
Officer (give title below) Other (specify below)
3. Date of Earliest Transaction (Month/Day/Year)
05/09/2011
4. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
Form filed by One Reporting Person
X 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, par value $0.01 per share 05/09/2011 P 247,000 A $1.99 3,905,676 D(1)
Common Stock, par value $0.01 per share 3,905,676 I See Footnote(2)
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
1. Name and Address of Reporting Person*
LANSDOWNE PARTNERS LIMITED PARTNERSHIP

(Last) (First) (Middle)
15 DAVIES STREET

(Street)
LONDON X0 W1K 3AG

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer
Director X 10% Owner
Officer (give title below) Other (specify below)
1. Name and Address of Reporting Person*
LANSDOWNE UK STRATEGIC INVESTMENT MASTER FUND LTD

(Last) (First) (Middle)
C/O CREDIT SUISSE (IRELAND) LTD
KILMORE HOUSE, PARK LANE, SPENCER DOCK

(Street)
DUBLIN L2

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer
Director X 10% Owner
Officer (give title below) Other (specify below)
Explanation of Responses:
1. These reported securities are held in the account of Lansdowne UK Strategic Investment Master Fund Limited (the "Master Fund"). The Master Fund entered into a purchase agreement with the Issuer as of May 9, 2011 whereby the Master Fund acquired 247,000 shares of common stock from the Issuer in a private transaction (the "Acquisition"). The Master Fund entered into the Acquisition in order to maintain the same percentage of common stock that it beneficially owned prior to the issuance of additional shares of equity securities by the Issuer. Therefore, the percentage of shares beneficially owned by the Master Fund did not change as a result of the Acquisition.
2. These reported securities are held in the account of the Master Fund and may be deemed to be beneficially owned by Lansdowne Partners Limited Partnership by virtue of its role as the investment advisor of the Fund. Lansdowne Partners Limited Partnership disclaims beneficial ownership of the reported securities except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that Lansdowne Partners Limited Partnership is the beneficial owner of these securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.
Lansdowne Partners Limited Partnership, By: Lansdowne Partners Limited, its general partner, By: /s/ Paul Ruddock, Director 05/10/2011
Lansdowne UK Strategic Investment Master Fund Limited, By: Lansdowne Partners Limited Partnership, its investment advisor, By: Lansdowne Partners Limited, its general partner, By: /s/ Paul Ruddock, Director 05/10/2011
** 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).
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