ATI Ownership | Who Owns ATI?

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ATI Ownership Summary

ATI is owned by 92.40% institutional investors, 1.00% insiders, and 6.60% retail investors. Blackrock funding, inc. /de is the largest institutional shareholder, holding 12.10% of ATI shares. iShares Core S&P Small-Cap ETF is the top mutual fund, with 6.39% of its assets in ATI shares.

ATI Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	ATI	92.40%	1.00%	6.60%
Sector	Industrials Stocks	49.61%	15.69%	34.70%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Blackrock funding, inc. /de	16.44M	12.10%	$2.39B
Blackrock	15.54M	10.87%	$861.91M
Vanguard group	12.73M	9.36%	$1.46B
Capital research global investors	6.16M	4.53%	$895.96M
Capital investors	5.88M	4.33%	$854.87M
Capital world investors	5.71M	4.20%	$831.00M
State street	5.38M	3.96%	$782.72M
Fmr	5.25M	3.86%	$763.25M
Invesco	3.86M	2.84%	$560.84M
Viking global investors lp	3.33M	2.45%	$484.80M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Dendur capital lp	1.28M	13.68%	$186.64M
Square wave capital	366.40K	12.89%	$53.30M
Fact capital, lp	103.10K	9.97%	$15.00M
Mountaineer partners management	91.78K	6.63%	$13.35M
Bowen hanes	1.04M	3.69%	$151.73M
Expect equity	25.95K	3.62%	$3.77M
Candelo capital management lp	28.15K	3.38%	$4.09M
Klcm advisors	262.84K	3.23%	$38.23M
S squared	55.00K	3.03%	$8.00M
Marathon partners equity management	17.50K	2.88%	$2.55M

Top Buyers

Holder	Shares	% Assets	Change
Viking global investors lp	3.33M	1.36%	3.33M
Capital research global investors	6.16M	0.14%	2.55M
Blackrock funding, inc. /de	16.44M	0.04%	1.77M
Norges bank	1.73M	0.02%	1.73M
Jane street group	1.49M	0.03%	1.21M

Top Sellers

Holder	Shares	% Assets	Change
Capital investors	5.88M	0.20%	-11.21M
Blackrock	15.54M	0.02%	-4.54M
Capital world investors	5.71M	0.11%	-1.64M
Palestra capital management	-	-	-1.06M
Fuller & thaler asset management	-	-	-911.11K

New Positions

Holder	Shares	% Assets	Change	Value
Viking global investors lp	3.33M	1.36%	3.33M	$484.80M
Norges bank	1.73M	0.02%	1.73M	$198.79M
Vanguard fiduciary trust	844.38K	0.03%	844.38K	$122.82M
Artemis investment management llp	721.50K	1.11%	721.50K	$104.95M
Freestone grove partners lp	575.87K	0.59%	575.87K	$83.77M

Sold Out

Holder	Change
Stephens consulting	-1.00
Newsquare capital	-2.00
Tfo-tdc	-4.00
Optima capital	-4.00
Ameriflex group	-5.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Mar 31, 2026	692	15.72%	125,575,390	-2.14%	92	1.08%	390	25.00%	195	4.84%
Dec 31, 2025	198	-60.16%	19,969,553	-84.49%	14	0.17%	103	-57.44%	56	-64.33%
Sep 30, 2025	214	-56.33%	24,594,902	-81.65%	17	0.19%	101	-58.78%	64	-64.25%
Jun 30, 2025	483	11.03%	133,865,193	1.60%	95	0.94%	240	-2.04%	177	46.28%
Mar 31, 2025	432	5.11%	132,561,794	-2.84%	101	0.90%	244	13.49%	119	-8.46%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
iShares Core S&P Small-Cap ETF	9.09M	6.39%	-1.90K
iShares Core S&P Mid-Cap ETF	4.59M	3.36%	-2.30K
Vanguard Total Stock Mkt Idx Inv	4.36M	3.19%	10.28K
American Funds SMALLCAP World A	4.29M	3.14%	-104.63K
Vanguard US Total Market Shares ETF	3.96M	2.81%	2.99K
VA CollegeAmerica Amcap 529A	3.50M	2.46%	172.18K
Capital Group Growth Fnd of Amer Comp	3.20M	2.34%	-3.64M
American Funds Growth Fund of Amer A	3.20M	2.34%	-3.64M
Vanguard Small Cap Index	3.15M	2.31%	-6.65K
American Funds IS® Asset Allocation 1	2.23M	1.63%	-1.24M

Recent Insider Transactions

Date	Name	Role	Activity	Value
Jun 02, 2026	Fields Kimberly A	Chair, President and CEO	Sell	$2.37M
Jun 02, 2026	Fields Kimberly A	Chair, President and CEO	Sell	$342.80K
Jun 02, 2026	Fields Kimberly A	Chair, President and CEO	Sell	$4.60M
Jun 02, 2026	Fields Kimberly A	Chair, President and CEO	Sell	$2.48M
Jun 02, 2026	Fields Kimberly A	Chair, President and CEO	Sell	$363.80K

Insider Transactions Trends

Date	Buy	Sell
2029 Q4	-	-
2026 Q1	-	-
2025 Q4	-	13
2025 Q3	-	7
2025 Q2	-	9

ATI Ownership FAQ

Who owns the most shares of ATI?

ATI’s largest shareholders are Blackrock funding, inc. /de (16.44M shares, 12.10%), Blackrock (15.54M shares, 10.87%), and Vanguard group (12.73M shares, 9.36%). Together, they hold 32.34% of ATI’s total shares outstanding.

Does Blackrock own ATI?

Yes, BlackRock owns 10.87% of ATI, totaling 15.54M shares as of Jun 2024. This represents 0.02% of BlackRock's total assets, with a market value of 861.91M$. In the last quarter, BlackRock decreased its holdings by -4.538M shares, a -22.60% change.

Who is ATI’s biggest shareholder by percentage of total assets invested?

Dendur capital lp is ATI’s biggest shareholder by percentage of total assets invested, with 13.68% of its assets in 1.28M ATI shares, valued at 186.64M$.

Who is the top mutual fund holder of ATI shares?

iShares Core S&P Small-Cap ETF is the top mutual fund holder of ATI shares, with 6.39% of its total shares outstanding invested in 9.09M ATI shares.

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