Dimensional
· Added
+$98M
Change
+4.6M
Date
Q1 2026
SI
| Investor | Type | Est. change | Change | Δ Own | Date | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dimensional
· Added
+$98M
Change
+4.6M
Date
Q1 2026
|
Dimensional | Added· Q1 2026 | +$98M | +4.6M | – | Q1 2026 | |||||
|
D. E. Shaw & Co., Inc.
· Reduced
−$69M
Change
−3.2M
Δ Own
−96.9%
Date
Q1 2026
|
D. E. Shaw & Co., Inc. | Reduced· Q1 2026 | −$69M | −3.2M | −96.9% | Q1 2026 | |||||
|
Norges
· Exited
−$61M
Change
−2.9M
Δ Own
−100.0%
Date
Q1 2026
|
Norges | Exited· Q1 2026 | −$61M | −2.9M | −100.0% | Q1 2026 | |||||
|
Gates Capital Management, Inc.
· New
+$59M
Change
+2.7M
Date
Q1 2026
|
Gates Capital Management, Inc. | New· Q1 2026 | +$59M | +2.7M | – | Q1 2026 | |||||
|
Citadel Advisors LLC
· Added
+$53M
Change
+2.5M
Δ Own
+312.7%
Date
Q1 2026
|
Citadel Advisors LLC | Added· Q1 2026 | +$53M | +2.5M | +312.7% | Q1 2026 | |||||
|
Canada Pension Plan Investment Board
· Added
+$43M
Change
+2.0M
Date
Q1 2026
|
Canada Pension Plan Investment Board | Added· Q1 2026 | +$43M | +2.0M | – | Q1 2026 | |||||
|
Pacer Advisors, Inc.
· Exited
−$37M
Change
−1.7M
Δ Own
−100.0%
Date
Q1 2026
|
Pacer Advisors, Inc. | Exited· Q1 2026 | −$37M | −1.7M | −100.0% | Q1 2026 | |||||
|
AQR Capital Management LLC
· Added
+$33M
Change
+1.5M
Date
Q1 2026
|
AQR Capital Management LLC | Added· Q1 2026 | +$33M | +1.5M | – | Q1 2026 | |||||
|
Hrt Financial LP
· Added
+$33M
Change
+1.5M
Date
Q1 2026
|
Hrt Financial LP | Added· Q1 2026 | +$33M | +1.5M | – | Q1 2026 | |||||
|
Two Sigma Advisers, LP
· Exited
−$21M
Change
−974K
Δ Own
−100.0%
Date
Q1 2026
|
Two Sigma Advisers, LP | Exited· Q1 2026 | −$21M | −974K | −100.0% | Q1 2026 | |||||
|
Healthcare of Ontario Pension Plan Trust Fund
· New
+$19M
Change
+901K
Date
Q1 2026
|
Healthcare of Ontario Pension Plan Trust Fund | New· Q1 2026 | +$19M | +901K | – | Q1 2026 | |||||
|
Two Sigma Investments, LP
· Reduced
−$16M
Change
−742K
Δ Own
−29.4%
Date
Q1 2026
|
Two Sigma Investments, LP | Reduced· Q1 2026 | −$16M | −742K | −29.4% | Q1 2026 | |||||
|
J. Goldman & Co LP
· Exited
−$15M
Change
−710K
Δ Own
−100.0%
Date
Q1 2026
|
J. Goldman & Co LP | Exited· Q1 2026 | −$15M | −710K | −100.0% | Q1 2026 | |||||
|
Panagora Asset Management Inc
· New
+$14M
Change
+650K
Date
Q1 2026
|
Panagora Asset Management Inc | New· Q1 2026 | +$14M | +650K | – | Q1 2026 | |||||
|
Goldman Sachs Group Inc
· Added
+$14M
Change
+638K
Date
Q1 2026
|
Goldman Sachs Group Inc | Added· Q1 2026 | +$14M | +638K | – | Q1 2026 | |||||
| Insider | Title | Type | Price | Qty | Value | Owned | ΔOwn | Trade date | Filed date | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Berkshire Hathaway Inc
· 10% Owner
Buy
+$22M
|
Berkshire Hathaway Inc | 10% Owner | Buy | $21.63 | +1.0M | +$22M | 124.8M | – | Aug 4, 2025 | Aug 4, 2025 | |||||||||
|
Berkshire Hathaway Inc
· 10% Owner
Buy
+$41M
|
Berkshire Hathaway Inc | 10% Owner | Buy | $21.02 | +1.9M | +$41M | 123.8M | – | Aug 1, 2025 | Aug 4, 2025 | |||||||||
|
Berkshire Hathaway Inc
· 10% Owner
2 operations
+$43M
|
Berkshire Hathaway Inc | 10% Owner | 2 operations | $21.04–$21.43 | +2.1M | +$43M | 121.8M | – | Jul 31, 2025 | Aug 4, 2025 | |||||||||
G
A
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475 reporting institutions disclosed SIRI position changes in the Q1 2026 snapshot.
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.