SEC Form 4 · Updated Daily
MLAB
— MESA LABORATORIES, INC. OwnershipInsider and institutional ownership derived from SEC Form 4 filings. Click any owner to see their holdings across every company they’ve filed on, and how their position has changed over time.
Current Reporting Owners
| Owner | Role | Shares Owned | As Of | Last Activity |
|---|---|---|---|---|
| Owens Gary M | Officer | 64,135 | 2025-10-27 | M |
| Sullivan John James | Director | 20,618 | 2026-08-15 | M |
| Sakys John | Officer | 19,785 | 2026-06-22 | S |
| Ladiwala Shiraz Shabanali | Director | 12,333 | 2026-08-15 | M |
| Tripeny R Tony | Director | 9,082 | 2026-08-15 | M |
| Alltoft Jennifer Sadie | Director | 7,662 | 2026-08-15 | M |
| Kadia Siddhartha | Officer | 7,093 | 2026-08-13 | P |
| Hall Shannon | Director | 6,973 | 2026-08-15 | M |
| Archbold Brian David | Officer | 6,377 | 2026-06-22 | S |
| Capone Mark Christopher | Director | 6,213 | 2026-08-15 | M |
| Crennen Lyndsey Elizabeth | Officer | 2,020 | 2026-06-22 | S |
Recent Filings
| Date | Owner | Activity | Shares | Price | Owned After |
|---|---|---|---|---|---|
| 2026-08-15 | Sullivan John James | Option exercise (derivative) | 2,784 | $0.00 | 0 |
| 2026-08-15 | Sullivan John James | Option exercise | 2,784 | $0.00 | 20,618 |
| 2026-08-15 | Tripeny R Tony | Option exercise (derivative) | 2,784 | $0.00 | 0 |
| 2026-08-15 | Tripeny R Tony | Option exercise | 2,784 | $0.00 | 9,082 |
| 2026-08-15 | Hall Shannon | Option exercise (derivative) | 2,784 | $0.00 | 0 |
| 2026-08-15 | Hall Shannon | Option exercise | 2,784 | $0.00 | 6,973 |
| 2026-08-15 | Ladiwala Shiraz Shabanali | Option exercise (derivative) | 3,810 | $0.00 | 0 |
| 2026-08-15 | Ladiwala Shiraz Shabanali | Option exercise | 3,810 | $0.00 | 12,333 |
| 2026-08-15 | Alltoft Jennifer Sadie | Option exercise (derivative) | 2,784 | $0.00 | 0 |
| 2026-08-15 | Alltoft Jennifer Sadie | Option exercise | 2,784 | $0.00 | 7,662 |
| 2026-08-15 | Capone Mark Christopher | Option exercise (derivative) | 2,784 | $0.00 | 0 |
| 2026-08-15 | Capone Mark Christopher | Option exercise | 2,784 | $0.00 | 6,213 |
| 2026-08-13 | Tripeny R Tony | Open-market buy | 900 | $113.69 | 6,298 |
| 2026-08-13 | Kadia Siddhartha | Open-market buy | 7,093 | $112.80 | 7,093 |
| 2026-08-13 | Sullivan John James | Open-market sale | 7,093 | $112.80 | 17,834 |
| 2026-06-22 | Sakys John | Open-market sale | 2,827 | $89.50 | 19,785 |
| 2026-06-22 | Archbold Brian David | Open-market sale | 2,516 | $89.50 | 6,377 |
| 2026-06-22 | Crennen Lyndsey Elizabeth | Open-market sale | 442 | $89.50 | 2,020 |
| 2026-06-18 | Sakys John | Option exercise (derivative) | 2,756 | $0.00 | 2,755 |
| 2026-06-18 | Sakys John | Option exercise (derivative) | 1,036 | $0.00 | 0 |
| 2026-06-18 | Sakys John | Grant / award | 2,282 | $95.10 | 22,612 |
| 2026-06-18 | Sakys John | Option exercise | 2,756 | $95.10 | 20,330 |
| 2026-06-18 | Sakys John | Option exercise | 1,036 | $95.10 | 17,574 |
| 2026-06-18 | Archbold Brian David | Option exercise (derivative) | 2,480 | $0.00 | 2,480 |
| 2026-06-18 | Archbold Brian David | Option exercise (derivative) | 844 | $0.00 | 0 |
| 2026-06-18 | Archbold Brian David | Grant / award | 1,859 | $95.10 | 8,893 |
| 2026-06-18 | Archbold Brian David | Option exercise | 2,480 | $95.10 | 7,034 |
| 2026-06-18 | Archbold Brian David | Option exercise | 844 | $95.10 | 4,554 |
| 2026-06-18 | Crennen Lyndsey Elizabeth | Option exercise (derivative) | 368 | $0.00 | 367 |
| 2026-06-18 | Crennen Lyndsey Elizabeth | Option exercise (derivative) | 233 | $0.00 | 232 |
| 2026-06-18 | Crennen Lyndsey Elizabeth | Option exercise (derivative) | 125 | $0.00 | 0 |
| 2026-06-18 | Crennen Lyndsey Elizabeth | Grant / award | 263 | $95.10 | 2,462 |
| 2026-06-18 | Crennen Lyndsey Elizabeth | Option exercise | 368 | $95.10 | 2,199 |
| 2026-06-18 | Crennen Lyndsey Elizabeth | Option exercise | 233 | $95.10 | 1,831 |
| 2026-06-18 | Crennen Lyndsey Elizabeth | Option exercise | 125 | $95.10 | 1,598 |
| 2026-06-16 | Sakys John | Open-market sale | 1,223 | $101.27 | 16,538 |
| 2026-06-16 | Crennen Lyndsey Elizabeth | Open-market sale | 118 | $101.27 | 1,473 |
| 2026-06-16 | Archbold Brian David | Open-market sale | 1,151 | $101.27 | 3,710 |
| 2026-06-15 | Sakys John | Grant / award (derivative) | 8,416 | $0.00 | 8,416 |
| 2026-06-15 | Sakys John | Option exercise (derivative) | 2,717 | $0.00 | 5,416 |
Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.