Two Sigma Advisers, LP
· Exited
Change
−3.5M
Δ Own
−100.0%
Date
Q1 2026
ES
| Investor | Type | Est. change | Change | Δ Own | Date | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Two Sigma Advisers, LP
· Exited
Change
−3.5M
Δ Own
−100.0%
Date
Q1 2026
|
Two Sigma Advisers, LP | Exited· Q1 2026 | – | −3.5M | −100.0% | Q1 2026 | |||||
|
Millennium Management LLC
· Reduced
Change
−3.3M
Date
Q1 2026
|
Millennium Management LLC | Reduced· Q1 2026 | – | −3.3M | – | Q1 2026 | |||||
|
Eversept Partners, LP
· Reduced
Change
−2.1M
Date
Q1 2026
|
Eversept Partners, LP | Reduced· Q1 2026 | – | −2.1M | – | Q1 2026 | |||||
|
Walleye Capital LLC
· Reduced
Change
−1.6M
Date
Q1 2026
|
Walleye Capital LLC | Reduced· Q1 2026 | – | −1.6M | – | Q1 2026 | |||||
|
Royce & Associates LP
· Reduced
Change
−975K
Date
Q1 2026
|
Royce & Associates LP | Reduced· Q1 2026 | – | −975K | – | Q1 2026 | |||||
|
Jane Street Group, LLC
· Reduced
Change
−957K
Date
Q1 2026
|
Jane Street Group, LLC | Reduced· Q1 2026 | – | −957K | – | Q1 2026 | |||||
|
Morgan Stanley
· Reduced
Change
−779K
Date
Q1 2026
|
Morgan Stanley | Reduced· Q1 2026 | – | −779K | – | Q1 2026 | |||||
|
Renaissance Technologies LLC
· Reduced
Change
−574K
Δ Own
−26.2%
Date
Q1 2026
|
Renaissance Technologies LLC | Reduced· Q1 2026 | – | −574K | −26.2% | Q1 2026 | |||||
|
Victory Capital Management Inc
· Reduced
Change
−568K
Date
Q1 2026
|
Victory Capital Management Inc | Reduced· Q1 2026 | – | −568K | – | Q1 2026 | |||||
|
Two Seas Capital LP
· Reduced
Change
−508K
Date
Q1 2026
|
Two Seas Capital LP | Reduced· Q1 2026 | – | −508K | – | Q1 2026 | |||||
|
Penderfund Capital Management Ltd.
· Reduced
Change
−500K
Date
Q1 2026
|
Penderfund Capital Management Ltd. | Reduced· Q1 2026 | – | −500K | – | Q1 2026 | |||||
|
Bank of America Corp
· Reduced
Change
−447K
Date
Q1 2026
|
Bank of America Corp | Reduced· Q1 2026 | – | −447K | – | Q1 2026 | |||||
|
Goldman Sachs Group Inc
· Reduced
Change
−438K
Date
Q1 2026
|
Goldman Sachs Group Inc | Reduced· Q1 2026 | – | −438K | – | Q1 2026 | |||||
|
D. E. Shaw & Co., Inc.
· Reduced
Change
−363K
Δ Own
−5.3%
Date
Q1 2026
|
D. E. Shaw & Co., Inc. | Reduced· Q1 2026 | – | −363K | −5.3% | Q1 2026 | |||||
|
Citadel Advisors LLC
· Reduced
Change
−282K
Δ Own
−37.7%
Date
Q1 2026
|
Citadel Advisors LLC | Reduced· Q1 2026 | – | −282K | −37.7% | Q1 2026 | |||||
| Insider | Title | Type | Price | Qty | Value | Owned | ΔOwn | Trade date | Filed date | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Hoffman Robert E.
· Director
3 operations
-132K
|
Hoffman Robert E. | Director | 3 operations | – | -132K | – | 0 | – | Jul 13, 2026 | Jul 13, 2026 | |||||||||
|
Carroll J. Martin
· Director
4 operations
-275K
|
Carroll J. Martin | Director | 4 operations | – | -275K | – | 0 | – | Jul 13, 2026 | Jul 13, 2026 | |||||||||
|
Shepard Jay
· Director
4 operations
-262K
|
Shepard Jay | Director | 4 operations | – | -262K | – | 0 | – | Jul 13, 2026 | Jul 13, 2026 | |||||||||
|
Fischer Seth H. Z.
· Director
4 operations
-239K
|
Fischer Seth H. Z. | Director | 4 operations | – | -239K | – | 0 | – | Jul 13, 2026 | Jul 13, 2026 | |||||||||
|
Thompson John Craig
· Director
2 operations
-120K
|
Thompson John Craig | Director | 2 operations | – | -120K | – | 0 | – | Jul 13, 2026 | Jul 13, 2026 | |||||||||
|
Harlow John B. Jr
· Officer
Shares transferred outside the market (D), often for tax or as a gift, not a market sale
-425K
|
Harlow John B. Jr | Officer | Shares transferred outside the market (D), often for tax or as a gift, not a market sale | – | -425K | – | 0 | −100.0% | Jul 13, 2026 | Jul 13, 2026 | |||||||||
|
Looker Benjamin
· Officer
4 operations
-1.3M
|
Looker Benjamin | Officer | 4 operations | – | -1.3M | – | 0 | – | Jul 13, 2026 | Jul 13, 2026 | |||||||||
|
Halladay Benjamin
· Officer
4 operations
-1.3M
|
Halladay Benjamin | Officer | 4 operations | – | -1.3M | – | 0 | – | Jul 13, 2026 | Jul 13, 2026 | |||||||||
|
Koenig Sheldon L.
· Director
4 operations
-4.2M
|
Koenig Sheldon L. | Director | 4 operations | – | -4.2M | – | 0 | – | Jul 13, 2026 | Jul 13, 2026 | |||||||||
|
Looker Benjamin
· Officer
Sell
−$37K
|
Looker Benjamin | Officer | Sell | $3.16 | −12K | −$37K | 668K | – | Jun 17, 2026 | Jun 18, 2026 | |||||||||
|
Koenig Sheldon L.
· Director
Sell
−$169K
|
Koenig Sheldon L. | Director | Sell | $3.15 | −54K | −$169K | 2.1M | – | Jun 17, 2026 | Jun 18, 2026 | |||||||||
|
Halladay Benjamin
· CFO
Sell
−$34K
|
Halladay Benjamin | CFO | Sell | $3.15 | −11K | −$34K | 703K | – | Jun 17, 2026 | Jun 18, 2026 | |||||||||
|
Thompson John Craig
· Director
Grant (A)
80K
|
Thompson John Craig | Director | Grant (A) | – | 80K | – | 80K | – | May 28, 2026 | Jun 1, 2026 | |||||||||
|
Shepard Jay
· Director
Grant (A)
80K
|
Shepard Jay | Director | Grant (A) | – | 80K | – | 164K | – | May 28, 2026 | Jun 1, 2026 | |||||||||
|
Hoffman Robert E.
· Director
Grant (A)
80K
|
Hoffman Robert E. | Director | Grant (A) | – | 80K | – | 85K | – | May 28, 2026 | Jun 1, 2026 | |||||||||
N
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187 reporting institutions disclosed ESPR 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.