Mesa Laboratories Inc /Co/ (MLAB) Insider Ownership

Historic Insider Ownership Trends

Mesa Laboratories's top three insider shareholders as of April 25, 2026 are Gary M Owens (President And Ceo, 64.14K shares), Gary M Owens (President And Ceo, 64.14K shares), John Bradley Schmieder (Director, 62.76K shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Gary M Owens President And Ceo 64,135 0 28 Oct, 2025
Gary M Owens President And Ceo 64,135 0 28 Oct, 2025
John Bradley Schmieder - 62,760 0 19 Sep, 2023
John Bradley Schmieder - 62,760 0 19 Sep, 2023
John James Sullivan - 0 44,780 14 Nov, 2023
John James Sullivan - 0 44,780 14 Nov, 2023
Laboratories Inc /Co/ Mesa - 29,788 0 16 Jun, 2022
Evan Guillemin - 29,207 0 02 Sep, 2022
John James Sullivan President And Ceo 25,282 0 05 Dec, 2025
John James Sullivan President And Ceo 25,282 0 05 Dec, 2025
John Bradley Schmieder - 0 19,360 15 Feb, 2022
John Bradley Schmieder - 0 19,360 15 Feb, 2022
John Sakys Cfo 15,044 0 25 Jun, 2025
John Sakys Cfo 15,044 0 25 Jun, 2025
Shiraz Shabanali Ladiwala - 8,523 0 10 Mar, 2026
R Tony Tripeny - 5,398 0 10 Mar, 2026
R Tony Tripeny - 5,398 0 10 Mar, 2026
Jennifer Sadie Alltoft - 4,878 0 18 Aug, 2025
Shannon Hall - 4,189 0 18 Aug, 2025
Gregory Dinoia Svp Commercial 3,634 0 22 Jun, 2022
Mark Christopher Capone - 3,429 0 10 Mar, 2026
David M Kelly - 2,600 0 09 Nov, 2021
Brian David Archbold Svp Operations 2,407 0 25 Jun, 2025

* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
14 Apr, 2026 Siddhartha Kadia Restricted Stock Units - 1 A 34,807 $0.00 34,807 D A
14 Apr, 2026 Siddhartha Kadia Restricted Stock Units - 1 A 34,807 $0.00 34,807 D A
31 Mar, 2026 Gary M Owens Restricted Stock Unit - 10 D 8,211 $0.00 16,448 D D
10 Mar, 2026 Shiraz Shabanali Ladiwala Common Stock A 3,500 $72.23 8,523 D P
10 Mar, 2026 R Tony Tripeny Common Stock A 1,315 $76.00 5,398 D P
10 Mar, 2026 Mark Christopher Capone Common Stock A 1,301 $76.35 3,429 D P
02 Dec, 2025 John James Sullivan Common Stock D 2,000 $0.00 25,282 D G
27 Oct, 2025 Gary M Owens Common Stock A 11,558 $0.00 64,135 D M
15 Aug, 2025 R Tony Tripeny Common Stock A 1,404 $0.00 4,083 D M
15 Aug, 2025 Shannon Hall Common Stock A 1,404 $0.00 4,189 D M
15 Aug, 2025 Mark Christopher Capone Common Stock A 1,404 $0.00 2,128 D M
15 Aug, 2025 Jennifer Sadie Alltoft Common Stock A 1,404 $0.00 4,878 D M
15 Aug, 2025 R Tony Tripeny Restricted Stock Units - 3 D 1,404 $0.00 0 D M
15 Aug, 2025 Mark Christopher Capone Restricted Stock Units - 2 D 1,404 $0.00 0 D M
15 Aug, 2025 Shannon Hall Restricted Stock Units - 7 D 1,404 $0.00 0 D M
15 Aug, 2025 Jennifer Sadie Alltoft Restricted Stock Units - 8 D 1,404 $0.00 0 D M
15 Aug, 2025 Jennifer Sadie Alltoft Restricted Stock Units - 9 A 2,784 $0.00 2,784 D A
15 Aug, 2025 R Tony Tripeny Restricted Stock Units - 4 A 2,784 $0.00 2,784 D A
15 Aug, 2025 Shannon Hall Restricted Stock Units - 8 A 2,784 $0.00 2,784 D A
15 Aug, 2025 Mark Christopher Capone Restricted Stock Units - 3 A 2,784 $0.00 2,784 D A