Sec Form 4/A Filing - Park Jeffrey G @ Catamaran Corp - 2012-11-26

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

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(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Park Jeffrey G 2. Issuer Name and Ticker or Trading Symbol Catamaran Corp [ SXCI] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chief Financial Officer & EVP (Last) (First) (Middle) 2441 WARRENVILLE ROAD, SUITE 610 3. Date of Earliest Transaction (MM/DD/YY) 11/26/2012 (Street) LISLE, IL60532 4. If Amendment, Date Original Filed (MM/DD/YY) 11/29/2012 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 share 11/26/2012 M( 1 ) 25,000 A $ 3.59 67,272 ( 2 ) D Common share 11/26/2012 M( 1 ) 20,056 A $ 6.385 87,328 D Common share 11/26/2012 M( 1 ) 11,954 A $ 15.125 99,282 D Common share 11/26/2012 S( 1 ) 47,710 D $ 47.8613 ( 3 ) 51,572 D Common share 11/26/2012 S( 1 ) 9,300 D $ 48.9176 ( 4 ) 42,272 D Common share 11/27/2012 M( 1 ) 3,006 A $ 15.125 45,278 D Common share 11/27/2012 M( 1 ) 14,770 A $ 2 5.115 60,048 D Common share 11/27/2012 S( 1 ) 16,776 D $ 46.9455 ( 5 ) 43,272 D Common share 11/27/2012 S( 1 ) 1,000 D $ 47.4178 ( 6 ) 42,272 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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 7. Title and Amount of Underlying Securities (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 of Derivative Security: 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 Stock option (nonqualified) $ 15.125 11/26/2012 M( 1 ) 11,954 ( 7 ) 03/10/2017 Common share 11,954 $ 0 17,966 D Stock option (nonqualified) $ 15.125 11/27/2012 M( 1 ) 3,006 ( 7 ) 03/10/2017 Common share 3,006 $ 0 14,960 D Stock option (nonqualified) $ 25.115 11/27/2012 M( 1 ) 14,770 ( 8 ) 03/09/2018 Common share 14,770 $ 0 44,314 D Stock option (nonqualified) $ 6.385 11/26/2012 M( 1 ) 20,056 ( 9 ) 06/04/2016 Common share 20,056 $ 0 20,056 D Stock option (nonqualified) $ 3.59 11/26/2012 M( 1 ) 25,000 ( 10 ) 08/11/2013 Common share 25,000 $ 0 0 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Park Jeffrey G 2441 WARRENVILLE ROAD SUITE 610 LISLE, IL60532 Chief Financial Officer & EVP Signatures Jeffrey G. Park, BY: Stacey Martinez, his attorney-in-fact 11/30/2012 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Exercised and/or sold pursuant to Insider's 10b5-1 plan. ( 2 )On October 1, 2012, the common stock of Catamaran Corporation split 2-for-1, resulting in the reporting person's acquisition of 21,136 additional shares of common stock. ( 3 )Prices for transactions reported range from $47.36 to $48.35. Full information regarding the number of shares purchased or sold at each separate price will be provided upon request by the Commission staff, the issuer, or a security holder of the issuer. ( 4 )Prices for transactions reported range from $48.36 to $49.28. Full information regarding the number of shares purchased or sold at each separate price will be provided upon request by the Commission staff, the issuer, or a security holder of the issuer. ( 5 )Prices for transactions reported range from $46.36 to $47.34. Full information regarding the number of shares purchased or sold at each separate price will be provided upon request by the Commission staff, the issuer, or a security holder of the issuer. ( 6 )Prices for transactions reported range from $47.38 to $47.44. Full information regarding the number of shares purchased or sold at each separate price will be provided upon request by the Commission staff, the issuer, or a security holder of the issuer. ( 7 )This option was granted 3/10/10 and vests in one-fourth increments on each grant date anniversary. ( 8 )This option was granted 3/09/11 and vests in one-fourth increments on each grant date anniversary. ( 9 )This option was granted 6/04/09 and vests in one-fourth increments on each grant date anniversary. ( 10 )This option was granted 8/11/08 and vests in one-fourth increments on each grant date anniversay.

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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