Citadel Advisors LLC
· Added
Change
+5.4M
Δ Own
+361.9%
Date
Q1 2026
ST
| Investor | Type | Est. change | Change | Δ Own | Date | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Citadel Advisors LLC
· Added
Change
+5.4M
Δ Own
+361.9%
Date
Q1 2026
|
Citadel Advisors LLC | Added· Q1 2026 | – | +5.4M | +361.9% | Q1 2026 | |||||
|
Millennium Management LLC
· Added
Change
+3.7M
Date
Q1 2026
|
Millennium Management LLC | Added· Q1 2026 | – | +3.7M | – | Q1 2026 | |||||
|
BlackRock
· Reduced
Change
−3.3M
Date
Q1 2026
|
BlackRock | Reduced· Q1 2026 | – | −3.3M | – | Q1 2026 | |||||
|
Analog Century Management LP
· New
Change
+2.3M
Date
Q1 2026
|
Analog Century Management LP | New· Q1 2026 | – | +2.3M | – | Q1 2026 | |||||
|
Hill City Capital, LP
· New
Change
+2.3M
Date
Q1 2026
|
Hill City Capital, LP | New· Q1 2026 | – | +2.3M | – | Q1 2026 | |||||
|
Balyasny Asset Management L.P.
· New
Change
+2.1M
Date
Q1 2026
|
Balyasny Asset Management L.P. | New· Q1 2026 | – | +2.1M | – | Q1 2026 | |||||
|
Duquesne Family Office LLC
· Added
Change
+1.8M
Δ Own
+237.8%
Date
Q1 2026
|
Duquesne Family Office LLC | Added· Q1 2026 | – | +1.8M | +237.8% | Q1 2026 | |||||
|
JPMorgan Chase & Co
· Reduced
Change
−1.8M
Date
Q1 2026
|
JPMorgan Chase & Co | Reduced· Q1 2026 | – | −1.8M | – | Q1 2026 | |||||
|
Arrowstreet Capital, Limited Partnership
· Exited
Change
−1.4M
Δ Own
−100.0%
Date
Q1 2026
|
Arrowstreet Capital, Limited Partnership | Exited· Q1 2026 | – | −1.4M | −100.0% | Q1 2026 | |||||
|
Woodline Partners LP
· Reduced
Change
−1.2M
Date
Q1 2026
|
Woodline Partners LP | Reduced· Q1 2026 | – | −1.2M | – | Q1 2026 | |||||
|
Invesco Ltd.
· Reduced
Change
−1.2M
Δ Own
−23.4%
Date
Q1 2026
|
Invesco Ltd. | Reduced· Q1 2026 | – | −1.2M | −23.4% | Q1 2026 | |||||
|
Jane Street Group, LLC
· New
Change
+1.2M
Date
Q1 2026
|
Jane Street Group, LLC | New· Q1 2026 | – | +1.2M | – | Q1 2026 | |||||
|
Van Eck Associates Corp
· Added
Change
+1.1M
Date
Q1 2026
|
Van Eck Associates Corp | Added· Q1 2026 | – | +1.1M | – | Q1 2026 | |||||
|
Alyeska Investment Group, L.P.
· New
Change
+956K
Date
Q1 2026
|
Alyeska Investment Group, L.P. | New· Q1 2026 | – | +956K | – | Q1 2026 | |||||
|
Two Sigma Investments, LP
· Reduced
Change
−860K
Δ Own
−23.9%
Date
Q1 2026
|
Two Sigma Investments, LP | Reduced· Q1 2026 | – | −860K | −23.9% | Q1 2026 | |||||
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Institutions hold 2.9% of STM shares in the Q1 2026 snapshot. The largest disclosed owners include Van Eck Associates Corp, Citadel Advisors LLC, Slate Path Capital LP. The ownership chart shows each group's share of total shares outstanding from the latest disclosed filings. Retail and other includes everyone who does not file, not a tracked group.
For each manager, WhoBought compares accepted consecutive 13F share counts. Share change is current shares minus prior shares. Estimated dollar change is that signed share change multiplied by the split-adjusted quarter-mean close. The activity table on this page uses Q1 2026.
An investor crossing 5% of a share class generally files Schedule 13D for activist intent or Schedule 13G for a passive position. The technical form names appear here rather than in the activity rows.
Ownership and institutional activity come from SEC Form 13F filings. Insider activity comes from SEC Form 4, and large-shareholder activity from SEC Schedules 13D and 13G. FMP supplies price data only. Company logos use the local verified Parqet cache with one shared fallback.
Form 13F is a quarterly disclosure and is normally filed after the quarter ends. Every ownership and activity value therefore names its represented period; it is not presented as a live position.
A muted dash marks a missing table value. It means the filing omitted the value, comparable data is unavailable, or no prior position exists for comparison.