ATI Ownership | Who Owns ATI?

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ATI Ownership Summary

ATI is owned by 95.03% institutional investors, 0.90% insiders, and 4.07% retail investors. Blackrock funding, inc. /de is the largest institutional shareholder, holding 13.77% 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	95.03%	0.90%	4.07%
Sector	Industrials Stocks	65.56%	16.67%	17.77%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Blackrock funding, inc. /de	18.71M	13.77%	$3.69B
Blackrock	15.54M	10.87%	$861.91M
Vanguard group	12.73M	9.36%	$1.46B
Vanguard capital management	6.16M	4.53%	$1.21B
Capital world investors	5.25M	3.86%	$1.03B
State street	5.24M	3.85%	$1.03B
Capital research global investors	5.09M	3.75%	$1.00B
Fmr	4.99M	3.67%	$983.37M
Capital investors	3.72M	2.74%	$733.17M
Invesco	3.45M	2.54%	$679.86M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Square wave capital	444.80K	13.08%	$87.67M
Fact capital, lp	99.68K	11.04%	$19.65M
Dendur capital lp	1.01M	10.44%	$198.87M
Mountaineer partners management	60.42K	9.02%	$11.91M
Bowen hanes	1.04M	3.69%	$151.73M
Candelo capital management lp	27.65K	3.36%	$5.45M
Klcm advisors	207.47K	3.22%	$40.89M
Rpg family wealth advisory	76.73K	3.14%	$15.12M
Expect equity	22.64K	2.87%	$4.46M
S squared	40.00K	2.45%	$7.88M

Top Buyers

Holder	Shares	% Assets	Change
Blackrock funding, inc. /de	18.71M	0.05%	2.27M
Norges bank	1.74M	0.03%	1.74M
Sixth street partners management company	1.48M	0.04%	1.48M
Qube research	2.14M	0.39%	1.29M
Bessemer group	954.98K	0.26%	952.88K

Top Sellers

Holder	Shares	% Assets	Change
Blackrock	15.54M	0.02%	-4.54M
Viking global investors lp	1.15M	0.65%	-2.18M
Capital investors	3.72M	0.15%	-2.16M
Capital research global investors	5.09M	0.14%	-1.07M
Palestra capital management	-	-	-1.06M

New Positions

Holder	Shares	% Assets	Change	Value
Norges bank	1.74M	0.03%	1.74M	$342.93M
Sixth street partners management company	1.48M	0.04%	1.48M	$292.35M
Polen capital management	819.24K	1.39%	819.24K	$161.47M
Scout investments	444.31K	0.66%	444.31K	$24.64M
Dsm capital partners	441.05K	1.49%	441.05K	$86.93M

Sold Out

Holder	Change
Stephens consulting	-1.00
Kilter group	-1.00
Newsquare capital	-2.00
Murphy & mullick capital management	-3.00
Curio wealth	-3.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Jun 30, 2026	821	15.63%	129,145,792	1.41%	95	1.08%	479	18.56%	222	12.12%
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%

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	4.69M	3.43%	144.00
Vanguard MStar Total Stk Mkt Idx Invest	4.35M	3.19%	12.39K
Vanguard Total Stock Mkt Idx Inv	4.33M	3.17%	-26.02K
Vanguard Morn Total Stk Mkt Idx Investor	4.33M	3.17%	-26.02K
American Funds SMALLCAP World A	4.21M	3.09%	-78.29K
Vanguard US Total Market Shares ETF	3.96M	2.81%	2.99K
VA CollegeAmerica Amcap 529A	3.50M	2.46%	172.18K
American Funds Growth Fund of Amer A	3.20M	2.34%	-3.64M
Vanguard Small Cap Index	3.14M	2.30%	7.25K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Aug 24, 2026	Harris Timothy J	Senior VP and CDIO	Sell	$3.41M
Aug 17, 2026	Fields Kimberly A	Chair, President and CEO	Sell	$1.88M
Aug 17, 2026	Fields Kimberly A	Chair, President and CEO	Sell	$459.12K
Aug 17, 2026	Fields Kimberly A	Chair, President and CEO	Sell	$228.32K
Aug 17, 2026	Fields Kimberly A	Chair, President and CEO	Sell	$2.11M

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 (18.71M shares, 13.77%), Blackrock (15.54M shares, 10.87%), and Vanguard group (12.73M shares, 9.36%). Together, they hold 34.00% 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?

Square wave capital is ATI’s biggest shareholder by percentage of total assets invested, with 13.08% of its assets in 444.8K ATI shares, valued at 87.67M$.

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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