Nasdaq · CIK 0000724004
MLAB MESA LABORATORIES INC /CO/
Insider trading from SEC Form 4. Last filing 32 d ago. Close $127.51 on Oct 9, 2026, +89% from the 52-week low and -10% from the high.
MESA LABORATORIES INC /CO/ (MLAB) has 39 SEC Form 4 filings on file from 10 insiders, the latest filed on Sep 11, 2026. No insider bought or sold on the open market in the last 90 days; rows filed in that time are grants, exercises, tax withholding and other transactions that carry no view on the price.
11 open-market trades have been scored at MLAB. The newest: Brian David Archbold (SVP Operations) sold $225k of stock on Jun 22, 2026, filed Jun 23, 2026, scored 31 (weak). The largest of the 11 shown: Gary M Owens (President and CEO) sold $572k on Oct 28, 2024, scored 49 (moderate). 2 insiders sold within 14 days of each other around Jun 22, 2026.
MLAB closed at $127.51 on Oct 9, 2026, 89% above its 52-week low and 10% below its 52-week high.
6 Form 144 notices of planned sales are on file, the latest filed Jun 16, 2025.
Last 90 days
Price and insider trades, last year
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
Open-market buys and sells at MESA LABORATORIES INC /CO/, scored.
| Score | Insider | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 31Weak | Brian David Archbold SVP Operations sell | $225k 2,516 shares | -28% | +64% from low-15% from high | |
| 19Weak | Lyndsey Elizabeth Crennen CAO sell | $40k 442 shares | -18% | +64% from low-15% from high | |
| 18Weak | Brian David Archbold SVP Operations sell | $117k 1,151 shares | -24% | +75% from low-9% from high | |
| 3Weak | Lyndsey Elizabeth Crennen CAO sell | $12k 118 shares | -7% | +75% from low-9% from high | |
| 58Moderate | Mark Christopher Capone director buy | $99k 1,301 shares | +61% | +28% from low-43% from high | |
| 61Notable | Shiraz Shabanali Ladiwala director buy | $253k 3,500 shares | +70% | +28% from low-43% from high | |
| 54Moderate | R Tony Tripeny director buy | $100k 1,315 shares | +32% | +28% from low-43% from high | |
| 31Weak | Brian David Archbold SVP Operations sell | $46k 472 shares | -46% | 0% from low-38% from high | |
| 29Weak | John Sakys CFO sell | $62k 642 shares | -5% | 0% from low-38% from high | |
| 37Weak | Gary M Owens President and CEO sell | $188k 1,939 shares | -4% | 0% from low-38% from high | |
| 49Moderate | Gary M Owens President and CEO sell | $572k 5,069 shares | -10% | - |
Planned sales
Form 144 notices filed before a sale of restricted or control stock, newest first. The sale itself usually reaches a Form 4 within days. All planned sales
| Filed | Seller | Shares | Value | Sale date | Past 3 months |
|---|---|---|---|---|---|
| Jun 16, 2025 | Archbold Brian David Officer | 472 0.01% of outstanding | $46k | Jun 16, 2025 | none |
| Jun 16, 2025 | Sakys John Officer | 642 0.01% of outstanding | $62k | Jun 16, 2025 | none |
| Jun 16, 2025 | Owens Gary M Officer, Director | 1,939 0.04% of outstanding | $188k | Jun 16, 2025 | $2.6M |
| Mar 19, 2025 | Owens Gary M Officer, Director | 21,000 0.39% of outstanding | $2.6M | Mar 19, 2025 | none |
| Oct 29, 2024 | Owens Gary M Officer, Director | 2,551 0.05% of outstanding | $286k | Oct 29, 2024 | $286k |
| Oct 28, 2024 | Owens Gary M Officer, Director | 2,518 0.05% of outstanding | $286k | Oct 28, 2024 | none |
Transactions
The newest 50 of 89 rows filed, every code.
| Date | Insider | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Sep 9, 2026 | Mark Christopher Capone director | AGrant or award Restricted Stock Units - 4derivative | +2,423 | $0.00 | $0 | 2,423 | 32 d ago |
| Sep 9, 2026 | John James Sullivan director | AGrant or award Restricted Stock Units - 11derivative | +1,774 | $0.00 | $0 | 1,774 | 32 d ago |
| Sep 9, 2026 | Shiraz Shabanali Ladiwala director | AGrant or award Restricted Stock Units - 7derivative | +2,510 | $0.00 | $0 | 2,510 | 32 d ago |
| Sep 9, 2026 | Shannon Hall director | AGrant or award Restricted Stock Units - 9derivative | +1,774 | $0.00 | $0 | 1,774 | 32 d ago |
| Sep 9, 2009 | Jennifer Sadie Alltoft director | AGrant or award Restricted Stock Units - 10derivative | +1,774 | $0.00 | $0 | 1,774 | 32 d ago |
| Sep 9, 2026 | R Tony Tripeny director | AGrant or award Restricted Stock Units - 5derivative | +1,774 | $0.00 | $0 | 1,774 | 32 d ago |
| Jun 18, 2026 | Brian David Archbold SVP Operations | MOption exercise Common Stock | +844 | $95.10 | $80k | 4,554 | Jun 23, 2026 |
| Jun 18, 2026 | Lyndsey Elizabeth Crennen CAO | MOption exercise Common Stock | +125 | $95.10 | $12k | 1,598 | Jun 23, 2026 |
| Jun 18, 2026 | Brian David Archbold SVP Operations | MOption exercise Common Stock | +2,480 | $95.10 | $236k | 7,034 | Jun 23, 2026 |
| Jun 18, 2026 | Lyndsey Elizabeth Crennen CAO | MOption exercise Common Stock | +233 | $95.10 | $22k | 1,831 | Jun 23, 2026 |
| Jun 18, 2026 | Brian David Archbold SVP Operations | AGrant or award Common Stock | +1,859 | $95.10 | $177k | 8,893 | Jun 23, 2026 |
| Jun 18, 2026 | Lyndsey Elizabeth Crennen CAO | MOption exercise Common Stock | +368 | $95.10 | $35k | 2,199 | Jun 23, 2026 |
| Jun 18, 2026 | Lyndsey Elizabeth Crennen CAO | AGrant or award Common Stock | +263 | $95.10 | $25k | 2,462 | Jun 23, 2026 |
| Jun 22, 2026 | Brian David Archbold SVP Operations | SOpen-market sale Common Stock | -2,516 | $89.50 | $225k | 6,377 | Jun 23, 2026 |
| Jun 18, 2026 | Brian David Archbold SVP Operations | MOption exercise Restricted Stock Units - 7derivative | -844 | $0.00 | $0 | 0 | Jun 23, 2026 |
| Jun 22, 2026 | Lyndsey Elizabeth Crennen CAO | SOpen-market sale Common Stock | -442 | $89.50 | $40k | 2,020 | Jun 23, 2026 |
| Jun 18, 2026 | Lyndsey Elizabeth Crennen CAO | MOption exercise Restricted Stock Unit - 1derivative | -125 | $0.00 | $0 | 0 | Jun 23, 2026 |
| Jun 18, 2026 | Brian David Archbold SVP Operations | MOption exercise Restricted Stock Units - 8derivative | -2,480 | $0.00 | $0 | 2,480 | Jun 23, 2026 |
| Jun 18, 2026 | Lyndsey Elizabeth Crennen CAO | MOption exercise Restricted Stock Units - 2derivative | -233 | $0.00 | $0 | 232 | Jun 23, 2026 |
| Jun 18, 2026 | Lyndsey Elizabeth Crennen CAO | MOption exercise Restricted Stock Units - 3derivative | -368 | $0.00 | $0 | 367 | Jun 23, 2026 |
| Jun 16, 2026 | Brian David Archbold SVP Operations | SOpen-market sale Common Stock10b5-1 | -1,151 | $101.27 | $117k | 3,710 | Jun 17, 2026 |
| Jun 16, 2026 | Lyndsey Elizabeth Crennen CAO | SOpen-market sale Common Stock10b5-1 | -118 | $101.27 | $12k | 1,473 | Jun 17, 2026 |
| Jun 15, 2026 | Brian David Archbold SVP Operations | MOption exercise Common Stock | +2,454 | $104.08 | $255k | 4,861 | Jun 16, 2026 |
| Jun 15, 2026 | Brian David Archbold SVP Operations | EExpiration of short derivative Non Qualified Stock Optionsderivative | -1,780 | $0.00 | $0 | 11,852 | Jun 16, 2026 |
| Jun 15, 2026 | Brian David Archbold SVP Operations | MOption exercise Restricted Stock Units - 9derivative | -2,454 | $0.00 | $0 | 4,892 | Jun 16, 2026 |
| Jun 15, 2026 | Brian David Archbold SVP Operations | AGrant or award Restricted Stock Units - 10derivative | +4,328 | $0.00 | $0 | 4,328 | Jun 16, 2026 |
| Mar 10, 2026 | Shiraz Shabanali Ladiwala director | POpen-market purchase Common Stock | +3,500 | $72.23 | $253k | 8,523 | Mar 10, 2026 |
| Mar 10, 2026 | Mark Christopher Capone director | POpen-market purchase Common Stock | +1,301 | $76.35 | $99k | 3,429 | Mar 10, 2026 |
| Mar 10, 2026 | R Tony Tripeny director | POpen-market purchase Common Stock | +1,315 | $76.00 | $100k | 5,398 | Mar 10, 2026 |
| Dec 2, 2025 | John James Sullivan director | GGift Common Stock | -2,000 | $0.00 | $0 | 25,282 | Dec 5, 2025 |
| Oct 27, 2025 | Gary M Owens President and CEO | MOption exercise Common Stock | +11,558 | $0.00 | $0 | 64,135 | Oct 28, 2025 |
| Aug 15, 2025 | Mark Christopher Capone director | MOption exercise Common Stock | +1,404 | $0.00 | $0 | 2,128 | Aug 18, 2025 |
| Aug 15, 2025 | Shannon Hall director | MOption exercise Common Stock | +1,404 | $0.00 | $0 | 4,189 | Aug 18, 2025 |
| Aug 15, 2025 | Shiraz Shabanali Ladiwala director | MOption exercise Common Stock | +1,949 | $0.00 | $0 | 5,023 | Aug 18, 2025 |
| Aug 15, 2025 | R Tony Tripeny director | MOption exercise Common Stock | +1,404 | $0.00 | $0 | 4,083 | Aug 18, 2025 |
| Aug 15, 2025 | John James Sullivan director | MOption exercise Common Stock | +1,404 | $0.00 | $0 | 27,282 | Aug 18, 2025 |
| Aug 15, 2025 | Jennifer Sadie Alltoft director | MOption exercise Common Stock | +1,404 | $0.00 | $0 | 4,878 | Aug 18, 2025 |
| Aug 15, 2025 | Jennifer Sadie Alltoft director | MOption exercise Restricted Stock Units - 8derivative | -1,404 | $0.00 | $0 | 0 | Aug 18, 2025 |
| Aug 15, 2025 | Mark Christopher Capone director | MOption exercise Restricted Stock Units - 2derivative | -1,404 | $0.00 | $0 | 0 | Aug 18, 2025 |
| Aug 15, 2025 | Shannon Hall director | MOption exercise Restricted Stock Units - 7derivative | -1,404 | $0.00 | $0 | 0 | Aug 18, 2025 |
| Aug 15, 2025 | Shiraz Shabanali Ladiwala director | MOption exercise Restricted Stock Units - 5derivative | -1,949 | $0.00 | $0 | 0 | Aug 18, 2025 |
| Aug 15, 2025 | R Tony Tripeny director | MOption exercise Restricted Stock Units - 3derivative | -1,404 | $0.00 | $0 | 0 | Aug 18, 2025 |
| Aug 15, 2025 | Jennifer Sadie Alltoft director | AGrant or award Restricted Stock Units - 9derivative | +2,784 | $0.00 | $0 | 2,784 | Aug 18, 2025 |
| Aug 15, 2025 | Mark Christopher Capone director | AGrant or award Restricted Stock Units - 3derivative | +2,784 | $0.00 | $0 | 2,784 | Aug 18, 2025 |
| Aug 15, 2025 | Shannon Hall director | AGrant or award Restricted Stock Units - 8derivative | +2,784 | $0.00 | $0 | 2,784 | Aug 18, 2025 |
| Aug 15, 2025 | Shiraz Shabanali Ladiwala director | AGrant or award Restricted Stock Units - 6derivative | +3,810 | $0.00 | $0 | 3,810 | Aug 18, 2025 |
| Aug 15, 2025 | R Tony Tripeny director | AGrant or award Restricted Stock Units - 4derivative | +2,784 | $0.00 | $0 | 2,784 | Aug 18, 2025 |
| Aug 15, 2025 | John James Sullivan director | MOption exercise Restricted Stock Units - 9derivative | -1,404 | $0.00 | $0 | 0 | Aug 18, 2025 |
| Aug 15, 2025 | John James Sullivan director | AGrant or award Restricted Stock Units - 10derivative | +2,784 | $0.00 | $0 | 2,784 | Aug 18, 2025 |
| Jun 21, 2025 | John Sakys CFO | MOption exercise Common Stock | +1,036 | $95.82 | $99k | 15,498 | Jun 25, 2025 |
Insiders
Everyone who has filed a Form 4 here.
- Jennifer Sadie Alltoftdirector
- Brian David ArchboldSVP Operations
- Mark Christopher Caponedirector
- Lyndsey Elizabeth CrennenCAO
- Shannon Halldirector
- Shiraz Shabanali Ladiwaladirector
- Gary M OwensPresident and CEO
- John SakysCFO
- John James Sullivandirector
- R Tony Tripenydirector
Questions about MLAB
Answered from the filings on this page, as of the latest one.
Are insiders buying MLAB?
No. In the last 90 days no insider at MESA LABORATORIES INC /CO/ bought or sold shares on the open market according to SEC Form 4 filings. The rows on file from that period are grants, exercises, tax withholding or other transactions, which carry no view on the price.
Who was the last insider to trade MLAB on the open market?
Brian David Archbold (SVP Operations) sold $225k of MLAB on Jun 22, 2026 and filed the Form 4 on Jun 23, 2026. InsiderTell scored 31 (weak), with 2 insiders on the same side within 14 days.
How many insiders file Form 4 at MESA LABORATORIES INC /CO/?
10 people have filed a Form 4 at MESA LABORATORIES INC /CO/, among them Jennifer Sadie Alltoft (director), Brian David Archbold (SVP Operations), Mark Christopher Capone (director). Officers, directors and holders of more than 10% of a share class must report their trades within two business days.
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.