FORM 4
[ X ] 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 OF SECURITIES
                                                                                  
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OMB Number: 3235-0287
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

BUSSE ROGER S 		2. Issuer Name and Ticker or Trading Symbol

PACIFIC CONTINENTAL CORP [ PCBK ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      _____ 10% Owner
__ X __ Officer (give title below)      _____ Other (specify below)
CHIEF EXECUTIVE OFFICER
(Last)          (First)          (Middle)

111 W 7TH AVE 		3. Date of Earliest Transaction (MM/DD/YYYY)

11/1/2017
(Street)

EUGENE, OR 97401
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
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. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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   11/1/2017     D    41555   D   (1) 0   D    

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. 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 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 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   $14.44   11/1/2017     D         16250      (4) 2/20/2018   COMMON STOCK   16250     (1) (2) 0   D    
STOCK OPTION   $12.07   11/1/2017     D         22751      (4) 4/21/2019   COMMON STOCK   22751     (1) (2) 0   D    
STOCK OPTION   $11.3   11/1/2017     D         11902      (4) 4/20/2020   COMMON STOCK   11902     (1) (2) 0   D    
RESTRICTED STOCK UNIT     (1) (3) 11/1/2017     D         2198      (4)   (4) COMMON STOCK   2198     (1) (3) 0   D    
RESTRICTED STOCK UNIT     (1) (3) 11/1/2017     D         7052      (4)   (4) COMMON STOCK   7052     (1) (3) 0   D    
RESTRICTED STOCK UNIT     (1) (3) 11/1/2017     D         5887      (4)   (4) COMMON STOCK   5887     (1) (3) 0   D    
RESTRICTED STOCK UNIT     (1) (3) 11/1/2017     D         8558      (4)   (4) COMMON STOCK   8558     (1) (3) 0   D    

Explanation of Responses:
(1)  In connection with the merger of Pacific Continental Corporation ("Pacific Continental") with and into Columbia Banking System, Inc. ("Columbia") on November 1, 2017 (the "Merger"), pursuant to the Agreement and Plan of Merger (the "Merger Agreement"), dated January 9, 2017, by and among Columbia , Pacific Continental and Coast Merger Sub, Inc., each outstanding Pacific Continental common share was converted into the right to receive .6430 of a Columbia common share.
(2)  At the effective time of the Merger, each outstanding stock option of Pacific Continental was cancelled and only entitled the holders thereof to receive (without interest), an amount in cash equal to the product of (i) the number of Pacific Continental common shares subject to such options immediately prior to the effective time of the Merger, multiplied by (ii) the excess, if any of (A) $27.00, the Equity Award Cashout Price over (B) the exercise price per Pacific Continental common share of such options less applicable taxes required to be withheld with respect to such payment. The Equity Award Cashout Price is equal to (A) 0.6430 multiplied by (B) $41.99, which was the Columbia average closing price for the 20 consecutive Nasdaq trading days ending on and including the trading day that was five trading days prior to the effective time of the Merger.
(3)  At the effective time of the Merger, each outstanding restricted stock unit of Pacific Continental ("Pacific Continental Restricted Stock Units"), whether vested or unvested, was cancelled and only entitled the holder of such Pacific Continental Restricted Stock Units to receive (without interest), an amount in cash equal to (i) the number of Pacific Continental common shares subject to such Pacific Continental Restricted Stock Units immediately prior to the effective time of the Merger, multiplied by (ii) $27.00, the Equity Award Cashout Price, less applicable taxes requires to be withheld with respect to such payments.
(4)  These Pacific Continental Stock Options and Pacific Continental Restricted Stock Units were cancelled at the effective time of the Merger and converted into the right to receive the consideration described in notes (2) or (3) above.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
BUSSE ROGER S
111 W 7TH AVE
EUGENE, OR 97401

CHIEF EXECUTIVE OFFICER

Signatures
Roger S. Busse 11/2/2017
** 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 control number.
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