Quick Takeaways
- MLAB - MESA LABORATORIES INC /CO/ has 14 insiders with reported activity on this page.
- Net insider value flow over the last year: +$155,575.
- Recent transaction rows are available for direct filing-level review.
- Info
- Insider Ownership
- Insider Trading
- Financials
- Holders
Insider Transactions Reported by 14 Insiders of MESA LABORATORIES INC /CO/
- Symbol
- MLAB on Nasdaq
- Location
- Lakewood, CO
What Changed
- Buy value: $452,076; sell value: $296,501.
- Net share flow: +3,063.
Why This Matters
- This page gives a plain-language issuer insider context before you inspect transaction-level evidence.
- Use the filing links below to verify timestamps, codes, and ownership impacts directly from SEC forms.
Official SEC Source
Insider trading overview
Last 12 monthsNet insider flow leans to buying over the last 12 months. Net value: +$155,575.
Buys
$452,076
Shares: 6,116
Insiders: 3
Sells
$296,501
Shares: 3,053
Insiders: 3
Net
+$155,575
Shares: +3,063
Insiders: 0
| Window (months) | Buy shares | Sell shares | Buy $ | Sell $ | Net $ |
|---|---|---|---|---|---|
| 0-3 | 6,116 | 0 | $452,076 | $0 | +$452,076 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 3,053 | $0 | $296,501 | -$296,501 |
MESA LABORATORIES INC /CO/ executives and other stock owners filed with the SEC include:
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Gary M. Owens | President and CEO | $7,737,724 | -$188,312 | -2.4% | Mixed | 31 Mar 2026 |
| John Bradley Schmieder | Director | $7,051,714 | Mixed | 14 Sep 2023 | ||
| John James Sullivan | Director | $5,737,069 | Mixed | 02 Dec 2025 | ||
| MESA LABORATORIES INC /CO/ | Director | $3,350,351 | Mixed | 15 Jun 2022 | ||
| Evan Guillemin | Director | $3,281,699 | Mixed | 01 Sep 2022 | ||
| John Sakys | Cfo | $2,566,577 | -$62,350 | -2.4% | Mixed | 21 Jun 2025 |
| Brian David Archbold | SVP Operations | $1,122,731 | -$45,840 | -3.9% | Mixed | 21 Jun 2025 |
| Shiraz Shabanali Ladiwala | Director | $794,144 | +$252,805 | +47% | Mixed | 10 Mar 2026 |
| R. Tony Tripeny | Director | $538,854 | +$99,940 | +23% | Mixed | 10 Mar 2026 |
| Jennifer Sadie Alltoft | Director | $503,138 | Mixed | 15 Aug 2025 | ||
| Gregory Dinoia | SVP Commercial | $496,105 | Mixed | 17 Jun 2022 | ||
| Shannon Hall | Director | $450,237 | Mixed | 15 Aug 2025 | ||
| Mark Christopher Capone | Director | $390,410 | +$99,331 | +34% | Mixed | 10 Mar 2026 |
| David M. Kelly | Director | $292,136 | Mixed | 08 Nov 2021 |
Top shareholders of MESA LABORATORIES INC /CO/ (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.
Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
| Holder | Source | Role / Reporting | Ownership % | Shares | Holdings Value | 12M Net Δ | As of | Details |
|---|---|---|---|---|---|---|---|---|
| Conestoga Capital Advisors, LLC |
13D/G
|
Conestoga Capital Advisors |
11%
|
618,111
|
$71,997,569 | $0 | 31 Dec 2024 | |
| ROYCE & ASSOCIATES LP |
13D/G
13F
|
Company |
5%
|
271,118
|
$31,579,825 | -$1,874,047 | 31 Mar 2025 | |
| BlackRock, Inc. |
13F
13D/G
|
Company |
6.9%
from 13D/G
|
398,666
|
$31,295,283 | — | 31 Dec 2025 | |
| VANGUARD GROUP INC |
13F
|
Company |
5.8%
|
321,899
|
$25,269,072 | — | 31 Dec 2025 | |
| Long Path Smaller Companies Fund, LP |
13D/G
|
— |
5.6%
|
311,703
|
$24,549,728 | $0 | 11 Mar 2026 | |
| Long Path Partners LP |
13F
|
Company |
4.1%
|
227,223
|
$17,837,006 | — | 31 Dec 2025 | |
| Boston Partners |
13F
|
Company |
3.8%
|
213,376
|
$16,751,917 | — | 31 Dec 2025 | |
| Select Equity Group, L.P. |
13F
|
Company |
3.7%
|
206,435
|
$16,205,148 | — | 31 Dec 2025 | |
| Ranger Investment Management, L.P. |
13F
|
Company |
3.7%
|
205,263
|
$16,113,146 | — | 31 Dec 2025 | |
| GENEVA CAPITAL MANAGEMENT LLC |
13F
|
Company |
3.2%
|
178,713
|
$14,028,948 | — | 31 Dec 2025 | |
| MORGAN STANLEY |
13F
|
Company |
3.2%
|
175,589
|
$13,783,817 | — | 31 Dec 2025 | |
| KENNEDY CAPITAL MANAGEMENT LLC |
13F
|
Company |
2.6%
|
144,606
|
$11,351,571 | — | 31 Dec 2025 | |
| DIAMOND HILL CAPITAL MANAGEMENT INC |
13F
|
Company |
2.6%
|
141,973
|
$11,144,881 | — | 31 Dec 2025 | |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
|
Company |
2.3%
|
127,950
|
$10,046,267 | — | 31 Dec 2025 | |
| STATE STREET CORP |
13F
|
Company |
2.2%
|
120,641
|
$9,470,319 | — | 31 Dec 2025 | |
| JANUS HENDERSON GROUP PLC |
13F
|
Company |
2.1%
|
116,642
|
$9,156,397 | — | 31 Dec 2025 | |
| DIMENSIONAL FUND ADVISORS LP |
13F
|
Company |
2.1%
|
116,363
|
$9,134,552 | — | 31 Dec 2025 | |
| Russell Investments Group, Ltd. |
13F
|
Company |
2.1%
|
116,337
|
$9,132,508 | — | 31 Dec 2025 | |
| RAYMOND JAMES FINANCIAL INC |
13F
|
Company |
1.8%
|
100,397
|
$7,886,726 | — | 31 Dec 2025 | |
| Gary M. Owens |
3/4/5
|
President and CEO |
—
mixed-class rows
|
263,041
mixed-class rows
|
$7,737,724 | -$188,312 | 31 Mar 2026 | |
| John Bradley Schmieder |
3/4/5
|
Director |
—
class O/S missing
|
62,760
|
$7,051,714 | — | 14 Sep 2023 | |
| Meros Investment Management, LP |
13F
|
Company |
1.5%
|
85,017
|
$6,673,835 | — | 31 Dec 2025 | |
| CRAWFORD INVESTMENT COUNSEL INC |
13F
|
Company |
1.5%
|
81,220
|
$6,375,770 | — | 31 Dec 2025 | |
| D. E. Shaw & Co., Inc. |
13F
|
Company |
1.4%
|
76,565
|
$6,010,353 | — | 31 Dec 2025 | |
| John James Sullivan |
3/4/5
|
Director |
—
mixed-class rows
|
72,846
mixed-class rows
|
$5,737,069 | — | 02 Dec 2025 | |
| MASON CAPITAL MANAGEMENT LLC |
13F
|
Company |
1.3%
|
70,300
|
$5,518,550 | — | 31 Dec 2025 | |
| AQR CAPITAL MANAGEMENT LLC |
13F
|
Company |
1.3%
|
70,138
|
$5,505,835 | — | 31 Dec 2025 | |
| NORTHERN TRUST CORP |
13F
|
Company |
1.2%
|
65,651
|
$5,153,605 | — | 31 Dec 2025 | |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC |
13F
|
Company |
1.1%
|
61,913
|
$4,860,171 | — | 31 Dec 2025 | |
| GABELLI FUNDS LLC |
13F
|
Company |
1.1%
|
60,724
|
$4,766,834 | — | 31 Dec 2025 | |
| CITADEL ADVISORS LLC |
13F
|
Company |
1.1%
|
58,521
|
$4,593,899 | — | 31 Dec 2025 | |
| JANE STREET GROUP, LLC |
13F
|
Company |
1%
|
56,371
|
$4,425,124 | — | 31 Dec 2025 | |
| GOLDMAN SACHS GROUP INC |
13F
|
Company |
0.99%
|
55,268
|
$4,338,540 | — | 31 Dec 2025 | |
| Roubaix Capital, LLC |
13F
|
Company |
0.99%
|
55,189
|
$4,332,336 | — | 31 Dec 2025 | |
| BANK OF AMERICA CORP /DE/ |
13F
|
Company |
0.98%
|
54,664
|
$4,291,125 | — | 31 Dec 2025 | |
| HERALD INVESTMENT MANAGEMENT Ltd |
13F
|
Company |
0.9%
|
50,000
|
$3,915,500 | — | 31 Dec 2025 | |
| Trexquant Investment LP |
13F
|
Company |
0.83%
|
46,121
|
$3,620,499 | — | 31 Dec 2025 | |
| Bank of New York Mellon Corp |
13F
|
Company |
0.8%
|
44,774
|
$3,514,791 | — | 31 Dec 2025 | |
| MESA LABORATORIES INC /CO/ |
3/4/5
|
Director |
—
mixed-class rows
|
29,818
mixed-class rows
|
$3,350,351 | — | 15 Jun 2022 | |
| Evan Guillemin |
3/4/5
|
Director |
—
mixed-class rows
|
29,297
mixed-class rows
|
$3,281,699 | — | 01 Sep 2022 | |
| MONIMUS CAPITAL MANAGEMENT, LP |
13F
|
Company |
0.73%
|
40,842
|
$3,206,097 | — | 31 Dec 2025 | |
| JACOBS LEVY EQUITY MANAGEMENT, INC |
13F
|
Company |
0.7%
|
38,842
|
$3,049,097 | — | 31 Dec 2025 | |
| John Sakys |
3/4/5
|
CFO |
—
mixed-class rows
|
49,530
mixed-class rows
|
$2,566,577 | -$62,350 | 21 Jun 2025 | |
| Qube Research & Technologies Ltd |
13F
|
Company |
0.51%
|
28,130
|
$2,208,205 | — | 31 Dec 2025 | |
| TUDOR INVESTMENT CORP ET AL |
13F
|
Company |
0.49%
|
27,426
|
$2,152,941 | — | 31 Dec 2025 | |
| BBR PARTNERS, LLC |
13F
|
Company |
0.45%
|
25,195
|
$1,977,808 | — | 31 Dec 2025 | |
| Irenic Capital Management LP |
13F
|
Company |
0.45%
|
25,000
|
$1,962,500 | — | 31 Dec 2025 | |
| STATE OF WISCONSIN INVESTMENT BOARD |
13F
|
Company |
0.41%
|
22,606
|
$1,774,571 | — | 31 Dec 2025 | |
| FRANKLIN RESOURCES INC |
13F
|
Company |
0.4%
|
22,074
|
$1,732,810 | — | 31 Dec 2025 | |
| SEGALL BRYANT & HAMILL, LLC |
13F
|
Company |
0.33%
|
18,203
|
$1,428,936 | — | 31 Dec 2025 |
Recent Insider Transactions by Companies or Individuals for MESA LABORATORIES INC /CO/
Showing up to 300 most recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | Value $ | * Price $ | Shares | Shares Owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Gary M. Owens | MLAB | Restricted Stock Unit - 10 | Disposed to Issuer | -33.3% | -8,211 | 16,448 | 31 Mar 2026 | Direct | ||
| Shiraz Shabanali Ladiwala | MLAB | Common Stock | Purchase | 69.7% | $252,805 | $72.23 | 3,500 | 8,523 | 10 Mar 2026 | Direct |
| Mark Christopher Capone | MLAB | Common Stock | Purchase | 61.1% | $99,331 | $76.35 | 1,301 | 3,429 | 10 Mar 2026 | Direct |
| R. Tony Tripeny | MLAB | Common Stock | Purchase | 32.2% | $99,940 | $76.00 | 1,315 | 5,398 | 10 Mar 2026 | Direct |
| John James Sullivan | MLAB | Common Stock | Gift | -7.33% | -2,000 | 25,282 | 02 Dec 2025 | Direct | ||
| Gary M. Owens | MLAB | Common Stock | Options Exercise | 22% | 11,558 | 64,135 | 27 Oct 2025 | Direct | ||
| Shiraz Shabanali Ladiwala | MLAB | Common Stock | Options Exercise | 63.4% | 1,949 | 5,023 | 15 Aug 2025 | Direct | ||
| Shiraz Shabanali Ladiwala | MLAB | Restricted Stock Units - 6 | Award | 3,810 | 3,810 | 15 Aug 2025 | Direct | |||
| Shiraz Shabanali Ladiwala | MLAB | Restricted Stock Units - 5 | Options Exercise | -100% | -1,949 | 0 | 15 Aug 2025 | Direct | ||
| John James Sullivan | MLAB | Common Stock | Options Exercise | 5.43% | 1,404 | 27,282 | 15 Aug 2025 | Direct | ||
| John James Sullivan | MLAB | Restricted Stock Units - 10 | Award | 2,784 | 2,784 | 15 Aug 2025 | Direct | |||
| John James Sullivan | MLAB | Restricted Stock Units - 9 | Options Exercise | -100% | -1,404 | 0 | 15 Aug 2025 | Direct | ||
| Shannon Hall | MLAB | Common Stock | Options Exercise | 50.4% | 1,404 | 4,189 | 15 Aug 2025 | Direct | ||
| Shannon Hall | MLAB | Restricted Stock Units - 8 | Award | 2,784 | 2,784 | 15 Aug 2025 | Direct | |||
| Shannon Hall | MLAB | Restricted Stock Units - 7 | Options Exercise | -100% | -1,404 | 0 | 15 Aug 2025 | Direct | ||
| R. Tony Tripeny | MLAB | Common Stock | Options Exercise | 52.4% | 1,404 | 4,083 | 15 Aug 2025 | Direct | ||
| R. Tony Tripeny | MLAB | Restricted Stock Units - 4 | Award | 2,784 | 2,784 | 15 Aug 2025 | Direct | |||
| R. Tony Tripeny | MLAB | Restricted Stock Units - 3 | Options Exercise | -100% | -1,404 | 0 | 15 Aug 2025 | Direct | ||
| Mark Christopher Capone | MLAB | Common Stock | Options Exercise | 193.9% | 1,404 | 2,128 | 15 Aug 2025 | Direct | ||
| Mark Christopher Capone | MLAB | Restricted Stock Units - 3 | Award | 2,784 | 2,784 | 15 Aug 2025 | Direct | |||
| Mark Christopher Capone | MLAB | Restricted Stock Units - 2 | Options Exercise | -100% | -1,404 | 0 | 15 Aug 2025 | Direct | ||
| Jennifer Sadie Alltoft | MLAB | Common Stock | Options Exercise | 40.4% | 1,404 | 4,878 | 15 Aug 2025 | Direct | ||
| Jennifer Sadie Alltoft | MLAB | Restricted Stock Units - 9 | Award | 2,784 | 2,784 | 15 Aug 2025 | Direct | |||
| Jennifer Sadie Alltoft | MLAB | Restricted Stock Units - 8 | Options Exercise | -100% | -1,404 | 0 | 15 Aug 2025 | Direct | ||
| John Sakys | MLAB | Common Stock | Tax liability | -2.93% | -454 | 15,044 | 21 Jun 2025 | Direct | ||
| John Sakys | MLAB | Common Stock | Options Exercise | 7.16% | 1,036 | 15,498 | 21 Jun 2025 | Direct | ||
| John Sakys | MLAB | Restricted Stock Units - 6 | Options Exercise | -50% | -1,036 | 1,036 | 21 Jun 2025 | Direct | ||
| Brian David Archbold | MLAB | Common Stock | Tax liability | -13.8% | -385 | 2,407 | 21 Jun 2025 | Direct | ||
| Brian David Archbold | MLAB | Common Stock | Options Exercise | 43.3% | 844 | 2,792 | 21 Jun 2025 | Direct | ||
| Brian David Archbold | MLAB | Restricted Stock Units - 7 | Options Exercise | -50% | -844 | 844 | 21 Jun 2025 | Direct | ||
| Gary M. Owens | MLAB | Common Stock | Tax liability | -2.67% | -1,445 | 52,577 | 21 Jun 2025 | Direct | ||
| Gary M. Owens | MLAB | Common Stock | Options Exercise | 6.51% | 3,301 | 54,022 | 21 Jun 2025 | Direct | ||
| Gary M. Owens | MLAB | Restricted Stock Units - 8 | Options Exercise | -50% | -3,301 | 3,300 | 21 Jun 2025 | Direct | ||
| Gary M. Owens | MLAB | Common Stock | Tax liability | -6.99% | -3,810 | 50,721 | 18 Jun 2025 | Direct | ||
| Gary M. Owens | MLAB | Common Stock | Options Exercise | 19% | 8,707 | 54,531 | 18 Jun 2025 | Direct | ||
| Gary M. Owens | MLAB | Restricted Stock Units - 9 | Options Exercise | -34% | -8,707 | 16,900 | 18 Jun 2025 | Direct | ||
| Brian David Archbold | MLAB | Common Stock | Tax liability | -37.4% | -1,166 | 1,948 | 18 Jun 2025 | Direct | ||
| Brian David Archbold | MLAB | Common Stock | Options Exercise | 458.1% | 2,556 | 3,114 | 18 Jun 2025 | Direct | ||
| Brian David Archbold | MLAB | Restricted Stock Units - 8 | Options Exercise | -34% | -2,556 | 4,960 | 18 Jun 2025 | Direct | ||
| John Sakys | MLAB | Common Stock | Tax liability | -7.91% | -1,243 | 14,462 | 18 Jun 2025 | Direct | ||
| John Sakys | MLAB | Common Stock | Options Exercise | 22.1% | 2,840 | 15,705 | 18 Jun 2025 | Direct | ||
| John Sakys | MLAB | Restricted Stock Units - 7 | Options Exercise | -34% | -2,840 | 5,511 | 18 Jun 2025 | Direct | ||
| Gary M. Owens | MLAB | Common Stock | Sale | -4.06% | $188,312 | $97.12 | -1,939 | 45,824 | 16 Jun 2025 | Direct |
| Brian David Archbold | MLAB | Common Stock | Sale | -45.8% | $45,840 | $97.12 | -472 | 558 | 16 Jun 2025 | Direct |
| John Sakys | MLAB | Common Stock | Sale | -4.75% | $62,350 | $97.12 | -642 | 12,865 | 16 Jun 2025 | Direct |
| John Sakys | MLAB | Restricted Stock Units - 8 | Award | 8,133 | 8,133 | 15 Jun 2025 | Direct | |||
| Brian David Archbold | MLAB | Restricted Stock Units - 9 | Award | 7,346 | 7,346 | 15 Jun 2025 | Direct | |||
| Gary M. Owens | MLAB | Restricted Stock Units - 10 | Award | 24,659 | 24,659 | 15 Jun 2025 | Direct | |||
| Gary M. Owens | MLAB | Common Stock | Options Exercise | 10.2% | 4,426 | 47,763 | 15 Jun 2025 | Direct | ||
| Gary M. Owens | MLAB | Restricted Stock Units - 7 | Options Exercise | -100% | -2,324 | 0 | 15 Jun 2025 | Direct |
* An asterisk sign (*) next to the price indicates that the price is likely invalid.