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Mesa Laboratories MLAB

US equityMarket cap rank #3480Scientific & Technical Instruments
$129.96 −$6.10 (-4.48%)
Pre-market · Oct 8, 8:10 am ET · After hours $130.00 +0.03%
Open$133.50
Prev close$136.06
Day range$129.73 – $135.35
Volume70.4K
Market cap$727.24M
P/E (TTM)152.9
Dividend yield0.49%

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Institutional ownership90.7%-1.35 pts vs. prior quarter
Institutions holding206-2 vs. prior quarter
Insider trades (recent)27 buys / 13 sellsNet buying
Short interest7.21% of floatDays to cover 3.0 · as of 15 Sep 2026
Short-sale volume share13.3%5-day average of daily volume

Short-sale volume as % of daily volume

7%11%16%20%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: +$386.8K (11 inflow days, 9 outflow days).

Net flow by order size, last 20 sessions

−$237.4KSuper+$624.2KBig+$3.1MMid+$1.7MSmall

Super/Big orders approximate institutional-size trades; Mid/Small approximate retail-size trades. Net buy minus sell value in each bucket, summed over the window.

The five largest holders on file together own 29.7% of shares outstanding.

Largest holders

  • Long Path Partners, LP8.53%
  • BlackRock7.87%
  • Vanguard Capital Management, LLC4.95%
  • Boston Partners Global Investors, Inc.4.74%
  • AQR Capital Management3.61%
  • Ranger Investment Management, L.P.3.11%
  • Diamond Hill Capital Management, LLC2.78%
  • Raymond James Financial, Inc.2.68%

By investor type

  • Mutual Fund64.84%
  • Hedge Fund18.41%
  • Public Company4.63%
  • Individual/Insider3.10%
  • Private Company1.75%
  • Government Pension Fund0.71%
  • Family Office/Trust0.21%
  • Insurance Company0.19%

Reported short interest has risen from 5.00% to 7.21% of float over the last 6 biweekly reports (30 Jun 2026 to 15 Sep 2026).

Recent institutional activity

HolderTypePeriodShare changeNew stake
Jacobs Levy Equity Management Inc Mutual Fund 2026/Q3 +86,421 2.3%
FMR Mutual Fund 2026/Q3 +82,287 1.6%
Jane Street Group, LLC Private Company 2026/Q3 +71,580 1.3%
Long Path Partners, LP Hedge Fund 2026/Q3 +71,543 8.5%
Wasatch Advisors LP Mutual Fund 2026/Q3 +64,435 2.1%
BlackRock Mutual Fund 2026/Q3 +46,701 7.9%
Qube Research & Technologies Ltd Mutual Fund 2026/Q3 +37,402 0.7%
AQR Capital Management Hedge Fund 2026/Q3 +33,115 3.6%
Citadel Advisors LLC Hedge Fund 2026/Q3 +27,467 0.6%
D. E. Shaw & Co., L.P. Hedge Fund 2026/Q3 +27,197 1.5%
Raymond James Financial, Inc. Public Company 2026/Q3 +27,026 2.7%
Dimensional Fund Advisors Mutual Fund 2026/Q3 +23,765 2.7%
John Sakys Individual/Insider 2026/Q3 +22,534 0.7%
Numeric Investors LLC Hedge Fund 2026/Q3 +21,593 0.4%
Vanguard Portfolio Management, LLC Mutual Fund 2026/Q3 +16,764 1.2%

Institutional buy/sell activity by reporting period, largest moves first.

Insider transactions

DateInsiderTitleTransactionSharesPriceHeld after
8 Sep 2026 Shiraz Ladiwala Lead Independent Director Other Derivative Acquisition +2,510 – 2,510
8 Sep 2026 John Sullivan Chairperson Other Derivative Acquisition +1,774 – 1,774
8 Sep 2026 R. Tripeny Independent Director Other Derivative Acquisition +1,774 – 1,774
8 Sep 2026 Mark Capone Director Other Derivative Acquisition +2,423 – 2,423
8 Sep 2026 Shannon Hall Independent Director Other Derivative Acquisition +1,774 – 1,774
26 Aug 2026 Gary Owens Chief Executive Officer Intent to Sell (Form 144) -20,358 $127.75 –
20 Aug 2026 Gary Owens Chief Executive Officer Intent to Sell (Form 144) -20,000 $122.50 –
14 Aug 2026 Shiraz Ladiwala Lead Independent Director Derivative Exercise and Retained +3,810 – 12,333
14 Aug 2026 John Sullivan Chairperson Derivative Exercise and Retained +2,784 – 65,728
14 Aug 2026 R. Tripeny Independent Director Derivative Exercise and Retained +2,784 – 9,082
14 Aug 2026 Mark Capone Director Derivative Exercise and Retained +2,784 – 6,213
14 Aug 2026 Shannon Hall Independent Director Derivative Exercise and Retained +2,784 – 6,973
14 Aug 2026 Jennifer Alltoft Independent Director Derivative Exercise and Retained +2,784 – 7,662
12 Aug 2026 John Sullivan Chairperson Private Disposition -7,093 $112.80 65,728
12 Aug 2026 R. Tripeny Independent Director Open Market Acquisition +900 $113.69 9,082
12 Aug 2026 Siddhartha Kadia Chief Executive Officer Private Acquisition +7,093 $112.80 7,093
21 Jun 2026 John Sakys VP, CFO & Chief Accounting Officer Automatic Disposition -2,827 $89.50 19,835
21 Jun 2026 Brian Archbold Senior Vice President of Continuous Improvement Open Market Disposition -2,516 $89.50 6,377
21 Jun 2026 Lyndsey Crennen Chief Accounting Officer Automatic Disposition -442 $89.50 2,020
17 Jun 2026 John Sakys VP, CFO & Chief Accounting Officer Other Acquisition +2,282 $95.10 19,835

From Form 4/Form 144 filings. Negative share counts are disposals (sales, gifts, or shares withheld for taxes); positive are acquisitions.

Short interest, by report

Report dateShares short% of floatDays to cover
15 Sep 2026 403,559 7.2% 3.0
31 Aug 2026 433,982 7.8% 2.7
14 Aug 2026 337,738 6.0% 2.0
31 Jul 2026 324,102 5.8% 2.5
15 Jul 2026 274,176 5.0% 1.2
30 Jun 2026 276,170 5.0% 1.3

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