$MIR

$15.41 +$0.49 (3.28%) Close

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

Ownership

13F as of Q2 2026 · 244.6M shares outstanding

Who owns MIR?

By type of holder

Institutions 100.0% Insiders 0.0% Everyone else 0.0%

Concentration Top 10 holders own 54.6%

BlackRock, Inc. 15.7% · Vanguard Portfolio Management LLC 7.4%

Institutional ownership

100.0%

0 pts vs last qtr

Institutional holders

345

-15 vs last qtr

Net shares bought

+8.5M

by institutions in Q2 2026

New / sold out

57 / 72

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Alyeska Investment Group, L.P. +6.8M
Congress Asset Management Co +5.6M

Biggest sellers in Q2 2026

Millennium Management LLC −4.1M
Janus Henderson Group PLC SOLD OUT −4.0M

Who is planning to sell?

Notices of proposed sale, last 12 months

$19.1M

5 notices from 4 people

Shares covered

770.9K

0.32% of the company

Arranged in advance

16%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Lawrence D Kingsley Revocable Trust TTEE Lawrence D Kingsley dtd 3/20/06 Director $15.9M
Schopfer Brian Officer 10b5-1 $2.77M

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, FY2019–FY2025

+4045.3%

+86.03% a year

Each share's claim on the business

−97.6%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

$49.6M vs $84.8M

over 7 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+ years0% 3–5 years68% 1–3 years12% Under 1 year19%

Quarterly turnover

16.2%

of institutional shares changed hands

Top 10 managers, median time held

4.5 years

Super Investors

Investment managers reporting MIR on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	38.3M	15.65%	+404.6K (+1.1%)	2021	0.0%
Shares held by quarter Peak holding38.3M (Q2'26) Change over 8 quarters+22.3M Share of the company15.650% BlackRock, Inc.'s full portfolio →
VP Vanguard Portfolio Management LLC	18.2M	7.43%	+274.1K (+1.5%)	2021	0.0%
Shares held by quarter Peak holding18.2M (Q2'26) Change over 8 quarters+18.2M Share of the company7.430% Vanguard Portfolio Management LLC's full portfolio →

BlackRock, Inc.

38.3M

% of company

15.65%

Change vs last qtr

+404.6K (+1.1%)

Held since

2021

Vanguard Portfolio Management LLC

18.2M

% of company

7.43%

Change vs last qtr

+274.1K (+1.5%)

Held since

2021

28 more super investors behind a free account

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

Institutional Funds

Mutual funds and ETFs reporting MIR on Form N-PORT; together they hold 56.1% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
IC iShares Core S&P Small-Cap ETF iShares Trust	$264M	14.7M	6.03%	0.24%	June 30, 2026
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$132M	7.4M	3.01%	0.01%	June 30, 2026

iShares Core S&P Small-Cap ETF

iShares Trust

Position value

$264M

% of company

6.03%

% of the fund

0.24%

As of

June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$132M

% of company

3.01%

% of the fund

0.01%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Mirion Technologies, 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
GS Goldman Sachs & Co. LLC 5%+ holder 13D · 2.3%	5.2M	2.12%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company2.120% Disclosed stake13D · 2.3% View the 13D/G filing →
GH GSAM Holdings LLC 5%+ holder 13D · 2.3%	5.1M	2.10%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company2.100% Disclosed stake13D · 2.3% View the 13D/G filing →

Goldman Sachs & Co. LLC

5%+ holder13D · 2.3%

5.2M

% of company

2.12%

Change vs last qtr

—

Held since

—

GSAM Holdings LLC

5%+ holder13D · 2.3%

5.1M

% of company

2.10%

Change vs last qtr

—

Held since

—

11 more holders behind a free account

See every insider and 5%+ holder of Mirion Technologies, Inc..

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