Sec Form 4 Filing - Radius Venture Partners III, LLC @ TACTILE SYSTEMS TECHNOLOGY INC - 2017-09-15

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 Radius Venture Partners III, LLC 2. Issuer Name and Ticker or Trading Symbol TACTILE SYSTEMS TECHNOLOGY INC [ TCMD] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 250 PARK AVENUE, SUITE 1102 3. Date of Earliest Transaction (MM/DD/YY) 09/15/2017 (Street) NEW YORK, NY10177 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ 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 09/15/2017 S 75,373 D $ 31.02 ( 1 ) 75,396 I By Radius Venture Partners III, LP ( 2 ) Common Stock 09/15/2017 S 821,902 D $ 31.02 ( 1 ) 822,147 I By Radius Venture Partners III QP, LP ( 3 ) Common Stock 09/15/2017 S 103,225 D $ 31.02 ( 1 ) 103,255 I By Radius Venture Partners III (Ohio) LP ( 4 )

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

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Radius Venture Partners III, LLC 250 PARK AVENUE SUITE 1102 NEW YORK, NY10177 X RADIUS VENTURE PARTNERS III L P 250 PARK AVENUE SUITE 1102 NEW YORK, NY10177 X Radius Venture Partners III QP, L.P. 250 PARK AVENUE SUITE 1102 NEW YORK, NY10177 X Radius Venture Partners III (OHIO), LP 250 PARK AVENUE SUITE 1102 NEW YORK, NY10177 X LUBIN DANIEL C 250 PARK AVENUE SUITE 1102 NEW YORK, NY10177 X Signatures RADIUS VENTURE PARTNERS III, LLC By: /s/ Daniel C. Lubin Managing Member 09/15/2017 Signature of Reporting Person Date RADIUS VENTURE PARTNERS III, L.P. By: Radius Venture Partners III, LLC, its General Partner By: /s/ Daniel C. Lubin Managing Member 09/15/2017 Signature of Reporting Person Date RADIUS VENTURE PARTNERS III QP, L.P. By: Radius Venture Partners III, LLC, its General Partner By: /s/ Daniel C. Lubin Managing Member 09/15/2017 Signature of Reporting Person Date RADIUS VENTURE PARTNERS (OHIO) III QP, L.P. By: Radius Venture Partners (Ohio) III, LLC, its General Partner By: Radius Venture Partners III, LLC, its sole member By: /s/ Daniel C. Lubin Managing Member 09/15/2017 Signature of Reporting Person Date /s/ Daniel C. Lubin 09/15/2017 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Represents public offering price of $33.00 per common share less the underwriter's discount of $1.98 per common share. ( 2 )These securities are held directly by Radius Venture Partners III, L.P. and indirectly by Radius Venture Partners III, LLC, the general partner of Radius Venture Partners III QP, L.P., Jordan S. Davis, managing member of Radius Venture Partners III, LLC, and Daniel C. Lubin, managing member of Radius Venture Partners III, LLC. Mr. Davis is a director of the Issuer and files separate Section 16 reports. Each of Radius Venture Partners III, LLC, Mr. Davis and Mr. Lubin may be deemed to beneficially own such securities, and disclaims such beneficial ownership except to the extent of its or his pecuniary interest therein. ( 3 )These securities are held directly by Radius Venture Partners III QP, L.P. and indirectly by Radius Venture Partners III, LLC, the general partner of Radius Venture Partners III QP, L.P., Jordan S. Davis, managing member of Radius Venture Partners III, LLC, and Daniel C. Lubin, managing member of Radius Venture Partners III, LLC. Mr. Davis is a director of the Issuer and files separate Section 16 reports. Each of Radius Venture Partners III, LLC, Mr. Davis and Mr. Lubin may be deemed to beneficially own such securities, and disclaims such beneficial ownership except to the extent of its or his pecuniary interest therein. ( 4 )These securities are held directly by Radius Venture Partners III (Ohio), L.P. and indirectly by Radius Venture Partners III, LLC, the general partner of Radius Venture Partners III (Ohio), L.P., Jordan S. Davis, managing member of Radius Venture Partners III, LLC and Daniel C. Lubin, managing member of Radius Venture Partners III, LLC. Mr. Davis is a director of the Issuer and files separate Section 16 reports. Each of Radius Venture Partners III, LLC, Mr. Davis and Mr. Lubin may be deemed to beneficially own such securities, and disclaims such beneficial ownership except to the extent of its or his pecuniary interest therein.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

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