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 OF SECURITIES 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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(Print or Type Responses)

1. Name and Address of Reporting Person * SEG Ventures, LLC   2. Issuer Name and Ticker or Trading Symbol MESA LABORATORIES INC /CO [MLAB] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner _____ Officer (give title below) __X__ Other (specify below) See Remarks (Last) (First) (Middle) 380 LAFAYETTE STREET, 6TH FLOOR 3. Date of Earliest Transaction (Month/Day/Year) 12/30/2009 (Street) NEW YORK, NY 10003 4. If Amendment, Date Original Filed(Month/Day/Year) 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 (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, no par value 12/30/2009   P   20,000 A $ 23.1 120,000 D   Common Stock, no par value 10/12/2010   P   30,000 A $ 21.52 150,000 D   Common Stock, no par value 12/21/2010   P   40,000 A $ 24.75 190,000 D   Common Stock, no par value 03/03/2011   P   10,000 A $ 29 200,000 D   Common Stock, no par value 07/07/2015   J(1)   28,845 D $ 89.98 171,155 D   Common Stock, no par value 09/20/2018   J(2)   171,155 D $ 0 0 D

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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 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
SEG Ventures, LLC 380 LAFAYETTE STREET 6TH FLOOR NEW YORK, NY 10003	X			See Remarks

Signatures

/s/ Evan Guillemin, Member		10/19/2018
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	See Exhibit 99.1.
(2)	See Exhibit 99.1.
Remarks: Evan Guillemin, a member and the principal financial officer of SEG Ventures, LLC ("SEG Ventures"), was appointed to the Board of Directors of Mesa Laboratories, Inc. (the "Issuer") on February 25, 2009.  SEG Ventures is filing this Form 4 on the basis that, solely for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, it may be deemed a director of the Issuer by deputization due to Mr. Guillemin's directorship. SEG Ventures disclaims beneficial ownership of the shares of Common Stock of the Issuer directly beneficially owned by Mr. Guillemin.

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