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$ATMU
$45.00 +$0.54 (1.21%) Close

Ownership

13F as of Q2 2026 · 81.6M shares outstanding

Who owns ATMU?

By type of holder
Institutions 100.0% Insiders 0.0% Everyone else 0.0%
Concentration Top 10 holders own 56.6%
BlackRock, Inc. 15.2% · FMR LLC 6.5%
Institutional ownership
100.0%
0 pts vs last qtr
Institutional holders
330
-19 vs last qtr
Net shares bought
+3.9M
by institutions in Q2 2026
New / sold out
59 / 78
positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026
  • BlackRock, Inc. +5.6M
  • Jupiter Topco LLC NEW +1.6M

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Biggest sellers in Q2 2026
  • Janus Henderson Group PLC SOLD OUT −1.6M
  • Eminence Capital, LP SOLD OUT −1.3M

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Who is planning to sell?

Notices of proposed sale, last 12 months
$1.64M
4 notices from 4 people
Shares covered
36.2K
0.04% of the company
Arranged in advance
0%
of the value is under a 10b5-1 plan
Under a 10b5-1 plan No plan
$0$819.9K$1.6MNovDecJanFebMarAprMayJun 2026: $1.6M without a planJunJulAugSepOct
Largest proposed sellers
  • Disher Stephanie Officer $1.16M
  • Kienzler Jack Officer $232K

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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, FY2021–FY2025
−0.6%
−0.15% a year
Each share's claim on the business
+0.6%
grew without buying or selling a share
Spent on buybacks vs paid in stock
$80.7M vs $31.5M
over 5 fiscal years
Diluted shares, split-adjusted
80.3M82.4M84.4M2021: 83.3M shares'212022: 83.3M shares'222023: 83.4M shares'232024: 83.6M shares'242025: 82.8M shares'25
Buybacks Stock-based comp
$0$30.4M$60.7M2021 buybacks: $02021 stock comp: $0'212022 buybacks: $02022 stock comp: $0'222023 buybacks: $02023 stock comp: $7.2M'232024 buybacks: $20.0M2024 stock comp: $11.9M'242025 buybacks: $60.7M2025 stock comp: $12.4M'25

How patient are the owners?

Institutional shares by how long they've been held
5+ years0% 3–5 years48% 1–3 years41% Under 1 year11%
Quarterly turnover
20.4%
of institutional shares changed hands
Top 10 managers, median time held
3 years

Super Investors

Investment managers reporting ATMU on Form 13F
B
BlackRock, Inc.
Shares
12.4M
% of company
15.18%
Change vs last qtr
+5.6M (+81.9%)
Held since
2023
F
FMR LLC
Shares
5.3M
% of company
6.52%
Change vs last qtr
+378.6K (+7.7%)
Held since
2023

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Institutional Funds

Mutual funds and ETFs reporting ATMU on Form N-PORT; together they hold 61.8% of the company
IC
iShares Core S&P Small-Cap ETF
iShares Trust
Position value
$251M
% of company
6.03%
% of the fund
0.23%
As of
June 30, 2026
VT
Vanguard Total Stock Market Index Fund
Vanguard Index Funds
Position value
$132M
% of company
3.17%
% of the fund
0.01%
As of
June 30, 2026

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Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G
DS
Disher Steph
Insider
Shares
363.0K
% of company
0.44%
Change vs last qtr
—
Held since
—
KJ
Kienzler Jack
Insider
Shares
75.8K
% of company
0.09%
Change vs last qtr
—
Held since
—

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