Mesa Laboratories, Inc.
Mesa Laboratories, Inc. (MLAB) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · MLAB · as of Sep 30, 2025
Ownership Breakdown
141
Institutional Holders
▼ 12 vs Q2
$334.10M
Total Inst. Value
▼ $154.15M vs Q2
5.52M
Shares Outstanding
freeFloat 89.43%
4.99M
13F Shares Held
▼ 195,840 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
MLAB largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
CONESTOGA CAPITAL ADVISORS, LLC industrial instruments for measurement, display, and control | 426.5K | 7.80% | 7.80% | $28.58B | Oct 24, 2025 | ▼ 139.7K |
BLACKROCK, INC. industrial instruments for measurement, display, and control | 388.8K | 7.11% | 7.11% | $26.05B | Nov 12, 2025 | ▼ 402.3K |
VANGUARD GROUP INC industrial instruments for measurement, display, and control | 321.7K | 5.89% | 5.89% | $21.56B | Nov 7, 2025 | ▼ 67.7K |
MORGAN STANLEY industrial instruments for measurement, display, and control | 255.0K | 4.67% | 4.67% | $17.09B | May 27, 2026 | ▲ 36.2K |
RANGER INVESTMENT MANAGEMENT, L.P. industrial instruments for measurement, display, and control | 209.7K | 3.84% | 3.84% | $14.05B | Nov 5, 2025 | ▼ 4.6K |
GENEVA CAPITAL MANAGEMENT LLC industrial instruments for measurement, display, and control | 191.4K | 3.50% | 3.50% | $12.82B | Nov 13, 2025 | ▼ 7.7K |
SIMCOE CAPITAL MANAGEMENT, LLC industrial instruments for measurement, display, and control | 190.9K | 3.49% | 3.49% | $12.79B | Nov 13, 2025 | NEW |
ROYCE & ASSOCIATES LP industrial instruments for measurement, display, and control | 148.6K | 2.72% | 2.72% | $9.95B | Nov 12, 2025 | ▼ 99.0K |
JANUS HENDERSON GROUP PLC industrial instruments for measurement, display, and control | 145.7K | 2.67% | 2.67% | $9.76B | Nov 14, 2025 | ▲ 32.4K |
KENT LAKE PR LLC industrial instruments for measurement, display, and control | 134.5K | 2.46% | 2.46% | $9.01B | Nov 14, 2025 | NEW |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
19
Increased
+639.4K shares9
New Positions
first time holders19
Decreased
−1.10M shares0
Sold Out
fully exitedNet shares change (top 50)
460.0K
+639.4K / −1.10M
Net new holders
+9
9 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
MLAB insider trading · insider activity
Source: SEC Form 4
Insiders have been net buyers of shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
3
Buy transactions
1
Sell transactions
3.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Kadia Siddhartha President and CEO | Apr 14, 2026 | Award | 35,236 | — | — | 35.2K | Form 4 ↗ |
Kadia Siddhartha President and CEO | Apr 14, 2026 | Award | 34,807 | — | — | 34.8K | Form 4 ↗ |
Owens Gary M President and CEO | Mar 31, 2026 | D-Return | 8,211 | — | — | 16.4K | Form 4 ↗ |
Ladiwala Shiraz Shabanali director | Mar 10, 2026 | Purchase | 3,500 | $72.23 | $252.8K | 8.5K | Form 4 ↗ |
Capone Mark Christopher director | Mar 10, 2026 | Purchase | 1,301 | $76.35 | $99.3K | 3.4K | Form 4 ↗ |
Tripeny R Tony director | Mar 10, 2026 | Purchase | 1,315 | $76.00 | $99.9K | 5.4K | Form 4 ↗ |
Sullivan John James director | Dec 2, 2025 | Gift | 2,000 | — | — | 25.3K | Form 4 ↗ |
Ladiwala Shiraz Shabanali director | Aug 15, 2025 | Award | 3,810 | — | — | 3.8K | Form 4 ↗ |
Sullivan John James director | Aug 15, 2025 | Award | 2,784 | — | — | 2.8K | Form 4 ↗ |
Hall Shannon director | Aug 15, 2025 | Award | 2,784 | — | — | 2.8K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Mesa Laboratories, Inc. (MLAB) is primarily owned by institutional investors, who hold approximately 90.3% of total shares outstanding. Company insiders own approximately 10.57%, while retail and public investors account for the remaining 0.00%.
The largest institutional shareholder of Mesa Laboratories, Inc. is CONESTOGA CAPITAL ADVISORS, LLC, holding approximately 426,457 shares — equal to 7.80% of outstanding shares — as of September 30, 2025.
A total of 141 institutional investors currently hold MLAB stock, with a combined institutional value of approximately $334,097,534 as of the most recent 13F filing period.
Frequently asked questions
MLAB ownershipMesa Laboratories, Inc. (MLAB) is primarily owned by institutional investors, who hold approximately 90.3% of shares. The largest shareholder is CONESTOGA CAPITAL ADVISORS, LLC with a 7.80% stake. Company insiders hold 10.57%. Data sourced from SEC Form 13F as of September 30, 2025.