ATI INC (ATI): Institutional Ownership
Hedge funds and institutional managers reporting a position in ATI · Materials. Based on the most recent 13F filing from each holder, sourced from SEC EDGAR.
Reported Holders
26
13F filers
Aggregate Value
$1.3B
Across holders
Last Price
$197.40
2026-06-26
Sector
Materials
GICS
Holder activity6 new13 added6 reduced
| Manager⇅ | Type⇅ | Shares⇅ | Market Value▼ | % of Total⇅ | % of Portfolio⇅ | Action⇅ | QoQ Change⇅ | Quarter⇅ |
|---|---|---|---|---|---|---|---|---|
| VIKING GLOBAL INVESTORS LP CIK 0001103804 | Hedge Fund | 3.33M | $484.8M | 36.8% | 1.4% | New | — | Q1 2026 |
| Holocene Advisors, LP CIK 0001700574 | Hedge Fund | 1.10M | $159.7M | 12.1% | 0.4% | Added | +$3.8M | Q1 2026 |
| Fisher Asset Management, LLC CIK 0000850529 | Institutional Manager | 925K | $134.5M | 10.2% | 0.0% | Added | +$2.3M | Q1 2026 |
| Qube Research & Technologies Ltd CIK 0001729829 | Hedge Fund | 859K | $124.9M | 9.5% | 0.1% | Added | +$62.3M | Q1 2026 |
| BALYASNY ASSET MANAGEMENT LLC CIK 0001218710 | Hedge Fund | 852K | $123.9M | 9.4% | 0.2% | Added | +$67.2M | Q1 2026 |
| GAMCO INVESTORS, INC. ET AL CIK 0000807249 | Institutional Manager | 362K | $52.6M | 4.0% | 0.5% | Reduced | $-3.1M | Q1 2026 |
| Davidson Kempner Capital Management LP CIK 0001595082 | Hedge Fund | 530K | $43.1M | 3.3% | 0.7% | New | — | Q3 2025 |
| Gotham Asset Management, LLC CIK 0001510387 | Hedge Fund | 260K | $37.9M | 2.9% | 0.1% | Reduced | $-4.4M | Q1 2026 |
| CITADEL ADVISORS LLC CIK 0001423053 | Hedge Fund | 190K | $27.7M | 2.1% | 0.0% | Added | +$8.1M | Q1 2026 |
| Walleye Capital LLC CIK 0001758720 | Hedge Fund | 146K | $21.3M | 1.6% | 0.1% | Added | +$19.6M | Q1 2026 |
| RENAISSANCE TECHNOLOGIES LLC CIK 0001037389 | Hedge Fund | 260K | $21.1M | 1.6% | 0.0% | Reduced | $-18.0M | Q3 2025 |
| TUDOR INVESTMENT CORP ET AL CIK 0000923093 | Hedge Fund | 89K | $12.9M | 1.0% | 0.0% | Added | +$11.7M | Q1 2026 |
| ExodusPoint Capital Management, LP CIK 0001736225 | Hedge Fund | 88K | $12.8M | 1.0% | 0.1% | Added | +$10.3M | Q1 2026 |
| Rokos Capital Management LLP CIK 0001666335 | Hedge Fund | 80K | $11.7M | 0.9% | 0.1% | New | — | Q1 2026 |
| SOROS FUND MANAGEMENT LLC CIK 0001029160 | Family Office | 53K | $7.7M | 0.6% | 0.1% | New | — | Q1 2026 |
| Brevan Howard Capital Management LP CIK 0001512857 | Hedge Fund | 46K | $6.6M | 0.5% | 0.1% | Added | +$5.4M | Q1 2026 |
| Man Group plc CIK 0001637460 | Hedge Fund | 41K | $5.9M | 0.5% | 0.0% | Reduced | $-6.8M | Q1 2026 |
| Verition Fund Management LLC CIK 0001454027 | Hedge Fund | 39K | $5.7M | 0.4% | 0.0% | Added | +$5.4M | Q1 2026 |
| MOORE CAPITAL MANAGEMENT, LP CIK 0001448574 | Hedge Fund | 34K | $4.9M | 0.4% | 0.1% | New | — | Q1 2026 |
| Hudson Bay Capital Management LP CIK 0001393825 | Hedge Fund | 27K | $4.0M | 0.3% | 0.0% | Reduced | $-9.4M | Q1 2026 |
New
Hedge Fund
$484.8M· 36.8% of total· 1.4% port· 3.33M sh· — QoQ· Q1 2026
Added
Hedge Fund
$159.7M· 12.1% of total· 0.4% port· 1.10M sh· +$3.8M QoQ· Q1 2026
Added
Institutional Manager
$134.5M· 10.2% of total· 0.0% port· 925K sh· +$2.3M QoQ· Q1 2026
Added
Hedge Fund
$124.9M· 9.5% of total· 0.1% port· 859K sh· +$62.3M QoQ· Q1 2026
Added
Hedge Fund
$123.9M· 9.4% of total· 0.2% port· 852K sh· +$67.2M QoQ· Q1 2026
Reduced
Institutional Manager
$52.6M· 4.0% of total· 0.5% port· 362K sh· $-3.1M QoQ· Q1 2026
New
Hedge Fund
$43.1M· 3.3% of total· 0.7% port· 530K sh· — QoQ· Q3 2025
Reduced
Hedge Fund
$37.9M· 2.9% of total· 0.1% port· 260K sh· $-4.4M QoQ· Q1 2026
Added
Hedge Fund
$27.7M· 2.1% of total· 0.0% port· 190K sh· +$8.1M QoQ· Q1 2026
Added
Hedge Fund
$21.3M· 1.6% of total· 0.1% port· 146K sh· +$19.6M QoQ· Q1 2026
Reduced
Hedge Fund
$21.1M· 1.6% of total· 0.0% port· 260K sh· $-18.0M QoQ· Q3 2025
Added
Hedge Fund
$12.9M· 1.0% of total· 0.0% port· 89K sh· +$11.7M QoQ· Q1 2026
Added
Hedge Fund
$12.8M· 1.0% of total· 0.1% port· 88K sh· +$10.3M QoQ· Q1 2026
New
Hedge Fund
$11.7M· 0.9% of total· 0.1% port· 80K sh· — QoQ· Q1 2026
New
Family Office
$7.7M· 0.6% of total· 0.1% port· 53K sh· — QoQ· Q1 2026
Added
Hedge Fund
$6.6M· 0.5% of total· 0.1% port· 46K sh· +$5.4M QoQ· Q1 2026
Reduced
Hedge Fund
$5.9M· 0.5% of total· 0.0% port· 41K sh· $-6.8M QoQ· Q1 2026
Added
Hedge Fund
$5.7M· 0.4% of total· 0.0% port· 39K sh· +$5.4M QoQ· Q1 2026
New
Hedge Fund
$4.9M· 0.4% of total· 0.1% port· 34K sh· — QoQ· Q1 2026
Reduced
Hedge Fund
$4.0M· 0.3% of total· 0.0% port· 27K sh· $-9.4M QoQ· Q1 2026
Reduced
Hedge Fund
$3.4M· 0.3% of total· 0.0% port· 24K sh· $-11.1M QoQ· Q1 2026
New
Hedge Fund
$3.2M· 0.2% of total· 0.0% port· 22K sh· — QoQ· Q1 2026
Added
Hedge Fund
$2.6M· 0.2% of total· 0.0% port· 18K sh· +$2.0M QoQ· Q1 2026
Added
Hedge Fund
$1.6M· 0.1% of total· 0.0% port· 11K sh· +$480K QoQ· Q1 2026
Unchanged
Hedge Fund
$1.5M· 0.1% of total· 0.0% port· 10K sh· +$0 QoQ· Q1 2026
Added
Hedge Fund
$1.1M· 0.1% of total· 0.0% port· 7K sh· +$805K QoQ· Q1 2026
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