Sec Form 4 Filing - Seith Douglas J @ AtriCure, Inc. - 2017-06-13

FORM 4 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 Seith Douglas J 2. Issuer Name and Ticker or Trading Symbol AtriCure, Inc. [ ATRC] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chief Operating Officer (Last) (First) (Middle) 7555 INNOVATION WAY 3. Date of Earliest Transaction (MM/DD/YY) 06/13/2017 (Street) MASON, OH45040 4. If Amendment, Date Original Filed (MM/DD/YY) 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 Stock 06/13/2017 M 1,500 A $ 10.1 240,979 D Common Stock 06/13/2017 M 10,000 A $ 10.05 250,979 D Common Stock 06/13/2017 M 512 A $ 5.7 251,491 D Common Stock 06/13/2017 M 21,100 A $ 6.27 272,591 D Common Stock 06/13/2017 M 25,000 A $ 6.73 297,591 D Common Stock 06/13/2017 S 58,112 D $ 21.39 ( 1 ) 239,479 D Common Stock 3,500 I Held by spouse ( 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 (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 (right to buy) $ 10.1 06/13/2017 M 1,500 05/28/2009( 3 ) 05/28/2018 Common Stock 1,500 $ 0 0 D Stock Option (right to buy) $ 10.05 06/13/2017 M 10,000 07/30/2009( 4 ) 07/30/2018 Common Stock 10,000 $ 0 0 D Stock Option (right to buy) $ 5.7 06/13/2017 M 512 10/28/2009( 5 ) 10/28/2018 Common Stock 512 $ 0 0 D Stock Option (right to buy) $ 6.27 06/13/2017 M 21,100 10/25/2013( 6 ) 10/25/2022 Common Stock 21,100 $ 0 0 D Stock Option (right to buy) $ 6.73 06/13/2017 M 25,000 12/27/2013( 7 ) 12/27/2022 Common Stock 25,000 $ 0 0 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Seith Douglas J 7555 INNOVATION WAY MASON, OH45040 Chief Operating Officer Signatures /s/ Douglas J. Seith 06/15/2017 Signature of Reporting Person Date

Explanation of Responses:

( 1 )This transaction was executed in multiple trades at prices ranging from $21.08 to $21.65 per share. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. ( 2 )The Reporting Person disclaims beneficial ownership of these securities, except as to his pecuniary interest therein. ( 3 )These options were granted on May 28, 2008 and are exercisable as to 25% of the shares one year from the date of grant and the remaining 75% thereafter vests and is exercisable in equal monthly installments on the same day of the month over the following three years. ( 4 )These options were granted on July 30, 2008 and are exercisable as to 25% of the shares one year from the date of grant and the remaining 75% thereafter vests and is exercisable in equal monthly installments on the same day of the month over the following three years. ( 5 )These options were granted on October 28, 2008 and are exercisable as to 25% of the shares one year from the date of grant and the remaining 75% thereafter vests and is exercisable in equal monthly installments on the same day of the month over the following three years. ( 6 )These options were granted on October 25, 2012 and are exercisable as to 25% of the shares one year from the date of grant and the remaining 75% thereafter vests and is exercisable in equal monthly installments on the same day of the month over the following three years. ( 7 )These options were granted on December 27, 2012 and are exercisable as to 25% of the shares one year from the date of grant and the remaining 75% thereafter vests and is exercisable in equal monthly installments on the same day of the month over the following three years.

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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