$MLAB

$131.32 +$2.07 (1.6%) Close

$MLAB Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 5.6M shares outstanding

Who owns MLAB?

By type of holder

Institutions 89.5% Insiders 3.7% Everyone else 6.8%

Concentration Top 10 holders own 42.4%

Long Path Partners LP 8.5% · BlackRock, Inc. 7.9%

Institutional ownership

89.5%

+3.6 pts vs last qtr

Institutional holders

158

-2 vs last qtr

Net shares bought

+203.6K

by institutions in Q2 2026

New / sold out

20 / 22

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Jacobs Levy Equity Management, Inc +86.4K
FMR LLC +82.4K

Biggest sellers in Q2 2026

Select Equity Group, L.P. SOLD OUT −235.9K
Roubaix Capital, LLC SOLD OUT −72.1K

Who is planning to sell?

Notices of proposed sale, last 12 months

$6.14M

7 notices from 3 people

Shares covered

51.8K

0.93% of the company

Arranged in advance

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Owens Gary M Former officer $5.43M
Sakys John Officer $377K

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2017–FY2026

+44.8%

+4.20% a year

Each share's claim on the business

−30.9%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $89M

over 10 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years47% 3–5 years7% 1–3 years20% Under 1 year25%

Quarterly turnover

16.2%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting MLAB on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
LP Long Path Partners LP	477.1K	8.53%	+71.5K (+17.6%)	Q4 '25	20.2%
Shares held by quarter Peak holding477.1K (Q2'26) Change over 8 quarters+477.1K Share of the company8.530% Long Path Partners LP's full portfolio →
B BlackRock, Inc.	440.6K	7.87%	+46.7K (+11.9%)	≤2021	0.0%
Shares held by quarter Peak holding844.4K (Q4'24) Change over 8 quarters−396.3K Share of the company7.870% BlackRock, Inc.'s full portfolio →

Long Path Partners LP

477.1K

% of company

8.53%

Change vs last qtr

+71.5K (+17.6%)

Held since

Q4 '25

BlackRock, Inc.

440.6K

% of company

7.87%

Change vs last qtr

+46.7K (+11.9%)

Held since

≤2021

28 more super investors behind a free account

See every manager holding Mesa Laboratories, Inc., how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting MLAB on Form N-PORT; together they hold 33.8% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$16.8M	168.5K	3.01%	0.00%	June 30, 2026
IR iShares Russell 2000 ETF iShares Trust	$13.8M	138.9K	2.48%	0.02%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$16.8M

% of company

3.01%

% of the fund

0.00%

As of

June 30, 2026

iShares Russell 2000 ETF

iShares Trust

Position value

$13.8M

% of company

2.48%

% of the fund

0.02%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Mesa Laboratories, Inc. and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
SJ Sullivan John James Insider	65.7K	1.17%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company1.170% Sullivan John James's insider activity →
OG Owens Gary M Insider	64.1K	1.15%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company1.150% Owens Gary M's insider activity →

Sullivan John James

Insider

65.7K

% of company

1.17%

Change vs last qtr

—

Held since

—

Owens Gary M

Insider

64.1K

% of company

1.15%

Change vs last qtr

—

Held since

—

9 more holders behind a free account

See every insider and 5%+ holder of Mesa Laboratories, Inc..

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