Mesa Laboratories, Inc. (MLAB) has 19 known insider and institutional holders on record. The largest holder is SEG Ventures, LLC with 120,000 shares. Other notable holders include Schmieder John Bradley and CAMPBELL H STUART.
Over the last 12 months, insiders have made 28 transactions in MLAB stock — 5 buys (valued at $452.08K) and 3 sells (valued at $296.5K). Insider buying has outpaced selling during this period, which may signal confidence in the company's prospects.
MLAB Insider Ownership
Top Holder
SEG Ventures, LLC
120,000 shares
Buys (12 mo)
5
$452.08K value
Sells (12 mo)
3
$296.5K value
12-Month Transaction Activity
Top Insider Holders
| # |
Name |
Role |
Shares Owned |
Last Filed |
Relative Size |
| 1 |
Seg Ventures, Llc |
Director |
120,000 |
2018-10-19 |
|
| 2 |
Schmieder John Bradley |
Director |
63,760 |
2023-09-19 |
|
| 3 |
Campbell H Stuart |
Director |
41,677 |
2018-11-28 |
|
| 4 |
Brooks Michael T |
Director |
32,730 |
2019-06-14 |
|
| 5 |
Sullivan John James |
Director |
25,282 |
2025-12-05 |
|
| 6 |
Adriance Glenn E |
Csmo |
20,838 |
2018-03-26 |
|
| 7 |
Owens Gary M |
President and CEO |
16,448 |
2026-04-02 |
|
| 8 |
Ladiwala Shiraz Shabanali |
Director |
8,523 |
2026-03-10 |
|
| 9 |
Tripeny R Tony |
Director |
5,398 |
2026-03-10 |
|
| 10 |
Capone Mark Christopher |
Director |
3,429 |
2026-03-10 |
|
| 11 |
Dwyer Robert V |
Director |
1,945 |
2020-04-03 |
|
| 12 |
Alltoft Jennifer Sadie |
Director |
1,404 |
2024-08-19 |
|
| 13 |
Hall Shannon |
Director |
1,404 |
2024-08-19 |
|
| 14 |
Sakys John |
CFO |
1,036 |
2025-06-25 |
|
| 15 |
Archbold Brian David |
SVP Operations |
844 |
2025-06-25 |
|
| 16 |
Kelly David M |
Director |
569 |
2021-11-09 |
|
| 17 |
Perez David Brian |
Director |
221 |
2020-06-17 |
|
| 18 |
Guillemin Evan |
Director |
90 |
2022-08-19 |
|
| 19 |
Dinoia Gregory |
SVP Commercial |
90 |
2022-06-22 |
|
Recent Transactions (last 12 months)
| Date |
Name |
Role |
Type |
Shares |
Price |
Value |
| 2026-03-31 |
Owens Gary M |
President and CEO |
Return of Shares |
8,211 |
- |
- |
| 2026-03-10 |
Ladiwala Shiraz Shabanali |
Director |
Informative Buy |
3,500 |
$72.23 |
$252.81K |
| 2026-03-10 |
Capone Mark Christopher |
Director |
Informative Buy |
1,301 |
$76.35 |
$99.33K |
| 2026-03-10 |
Tripeny R Tony |
Director |
Informative Buy |
1,315 |
$76.00 |
$99.94K |
| 2025-12-02 |
Sullivan John James |
Director |
Gift (Given) |
2,000 |
- |
- |
| 2025-10-27 |
Owens Gary M |
President and CEO |
Option Exercise |
11,558 |
- |
- |
| 2025-08-15 |
Alltoft Jennifer Sadie |
Director |
Option Exercise (Sell) |
1,404 |
- |
- |
| 2025-08-15 |
Ladiwala Shiraz Shabanali |
Director |
Option Exercise (Sell) |
1,949 |
- |
- |
| 2025-08-15 |
Hall Shannon |
Director |
Option Exercise (Sell) |
1,404 |
- |
- |
| 2025-08-15 |
Capone Mark Christopher |
Director |
Option Exercise (Sell) |
1,404 |
- |
- |
| 2025-08-15 |
Tripeny R Tony |
Director |
Option Exercise (Sell) |
1,404 |
- |
- |
| 2025-08-15 |
Sullivan John James |
Director |
Option Exercise (Sell) |
1,404 |
- |
- |
| 2025-06-21 |
Archbold Brian David |
SVP Operations |
Option Exercise (Sell) |
844 |
- |
- |
| 2025-06-21 |
Sakys John |
CFO |
Option Exercise (Sell) |
1,036 |
- |
- |
| 2025-06-21 |
Owens Gary M |
President and CEO |
Option Exercise (Sell) |
3,301 |
- |
- |
| 2025-06-18 |
Archbold Brian David |
SVP Operations |
Tax Withholding of RSU |
1,166 |
$92.99 |
$108.43K |
| 2025-06-18 |
Owens Gary M |
President and CEO |
Option Exercise (Sell) |
8,707 |
- |
- |
| 2025-06-18 |
Sakys John |
CFO |
Option Exercise (Sell) |
2,840 |
- |
- |
| 2025-06-16 |
Archbold Brian David |
SVP Operations |
Informative Sell |
472 |
$97.12 |
$45.84K |
| 2025-06-15 |
Archbold Brian David |
SVP Operations |
Option Exercise (Sell) |
535 |
- |
- |
| 2025-06-16 |
Owens Gary M |
President and CEO |
Informative Sell |
1,939 |
$97.12 |
$188.31K |
| 2025-06-15 |
Owens Gary M |
President and CEO |
Option Exercise (Sell) |
2,324 |
- |
- |
| 2025-06-16 |
Sakys John |
CFO |
Informative Sell |
642 |
$97.12 |
$62.35K |
| 2025-06-15 |
Sakys John |
CFO |
Option Exercise (Sell) |
793 |
- |
- |
| 2015-06-15 |
Sakys John |
CFO |
RSU Award |
668 |
- |
- |
