FRONTIER CAPITAL MANAGEMENT CO LLC

Position in ATI — Ati Inc

CIK 351173 Boston, MA

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Position in ATI

as of Mar 31, 2026 · filed May 15, 2026 Compact

Position Value

$101,010,624

-$39,851,882 QoQ

Shares Held

694,422

-43.4% QoQ

Ownership

0.509%

of shares outstanding

% of Portfolio

1.04%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

25 quarters on record

Voting authority Sole 67.88825814850335.ToString("F0")% Shared 0.ToString("F0")% None 32.11174185149664.ToString("F0")%

Common Shares in ATI Over Time

Shares Held

Position Value (USD)

Position in Metal Fabrication

Industrials · as of Mar 31, 2026

FRONTIER CAPITAL MANAGEMENT CO LLC holds $189,835,185 across 4 Metal Fabrication names. ATI ranks #1 (53.2% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	ATI	Ati Inc This page	694,422	$101,010,624
2	CRS	Carpenter Technology Corp	99,134	$39,073,666
3	RYZ	Ryerson Holding Corp	1,517,062	$34,103,553
4	MLI	Mueller Industries Inc	282,443	$15,647,342

All Filings in ATI

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25 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$101,010,624	694,422	-43.4%	Shares	Sole	2026-05-15
2025-12-31	$140,862,506	1,227,453	-21.0%	Shares	Sole	2026-02-17
2025-09-30	$126,447,991	1,554,561	-30.2%	Shares	Sole	2025-11-14
2025-06-30	$192,169,010	2,225,724	-14.5%	Shares	Sole	2025-08-14
2025-03-31	$135,395,483	2,602,258	-14.9%	Shares	Sole	2025-05-15
2024-12-31	$168,342,647	3,058,551	-2.0%	Shares	Sole	2025-02-14
2024-09-30	$208,840,228	3,121,211	-0.4%	Shares	Sole	2024-11-14
2024-06-30	$173,682,652	3,132,239	-6.2%	Shares	Sole	2024-08-14
2024-03-31	$170,873,567	3,339,331	-8.4%	Shares	Sole	2024-05-15
2023-12-31	$165,767,432	3,645,644	+19.5%	Shares	Sole	2024-02-14
2023-09-30	$125,548,650	3,051,000	-12.7%	Shares	Sole	2023-11-14
2023-06-30	$154,521,662	3,493,594	-2.8%	Shares	Sole	2023-08-14
2023-03-31	$141,865,250	3,595,166	+1.3%	Shares	Sole	2023-05-15
2022-12-31	$105,949,431	3,548,206	+139.3%	Shares	Sole	2023-02-14
2022-09-30	$39,461,618	1,482,962	+39.3%	Shares	Sole	2022-11-14
2022-06-30	$24,174,681	1,064,495	-41.9%	Shares	Sole	2022-07-20
2022-03-31	$49,215,944	1,833,679	-1.2%	Shares	Sole	2022-04-14
2021-12-31	$29,559,325	1,855,576	+31.7%	Shares	Sole	2022-01-19
2021-09-30	$23,433,698	1,409,122	-29.6%	Shares	Sole	2021-10-19
2021-06-30	$41,704,941	2,000,237	+102.7%	Shares	Sole	2021-08-09
2021-03-31	$20,784,261	986,907	+163.1%	Shares	Sole	2021-05-13
2020-12-31	$6,289,387	375,038	-11.8%	Shares	Sole	2021-01-19
2020-09-30	$3,708,354	425,270	-7.7%	Shares	Sole	2020-11-16
2020-06-30	$4,695,969	460,841	-84.6%	Shares	Sole	2020-07-17
2020-03-31	$25,495,571	2,999,479	—	Shares	Sole	2020-04-16
No filing history on record for this holder in this stock.