$ATI

$164.54 +$7.66 (4.88%) Close

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

Ownership

13F as of Q2 2026 · 136.2M shares outstanding

Who owns ATI?

By type of holder

Institutions 93.5% Insiders 0.0% Everyone else 6.5%

Concentration Top 10 holders own 44.1%

BlackRock, Inc. 13.7% · Vanguard Portfolio Management LLC 4.6%

Institutional ownership

93.5%

-0.0 pts vs last qtr

Institutional holders

789

+112 vs last qtr

Net shares bought

−40.3K

by institutions in Q2 2026

New / sold out

177 / 65

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

BlackRock, Inc. +2.3M
Norges Bank NEW +1.7M

Biggest sellers in Q2 2026

Viking Global Investors LP −2.2M
Capital International Investors −2.2M

Who is planning to sell?

Notices of proposed sale, last 12 months

$91.2M

23 notices from 6 people

Shares covered

628.6K

0.46% of the company

Arranged in advance

90%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Wetherbee Robert S Officer 10b5-1 $35.2M
Fields Kimberly A Officer 10b5-1 $34.6M

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, FY2016–FY2025

+32.2%

+3.15% a year

Each share's claim on the business

−24.3%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

$955M vs $142M

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+ years67% 3–5 years6% 1–3 years13% Under 1 year14%

Quarterly turnover

13.9%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting ATI on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	18.7M	13.74%	+2.3M (+13.8%)	≤2021	0.1%
Shares held by quarter Peak holding18.7M (Q2'26) Change over 8 quarters+2.8M Share of the company13.740% BlackRock, Inc.'s full portfolio →
VP Vanguard Portfolio Management LLC	6.2M	4.57%	+398.4K (+6.8%)	≤2021	0.1%
Shares held by quarter Peak holding6.2M (Q2'26) Change over 8 quarters+6.2M Share of the company4.570% Vanguard Portfolio Management LLC's full portfolio →

BlackRock, Inc.

18.7M

% of company

13.74%

Change vs last qtr

+2.3M (+13.8%)

Held since

≤2021

Vanguard Portfolio Management LLC

6.2M

% of company

4.57%

Change vs last qtr

+398.4K (+6.8%)

Held since

≤2021

28 more super investors behind a free account

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

Institutional Funds

Mutual funds and ETFs reporting ATI on Form N-PORT; together they hold 48.1% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
IC iShares Core S&P Mid-Cap ETF iShares Trust	$921M	4.7M	3.43%	0.74%	June 30, 2026
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$854M	4.3M	3.18%	0.04%	June 30, 2026

iShares Core S&P Mid-Cap ETF

iShares Trust

Position value

$921M

% of company

3.43%

% of the fund

0.74%

As of

June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$854M

% of company

3.18%

% of the fund

0.04%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding ATI Inc. and how much of the fund the position is.

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