Brooklands Fund Management Ltd
· Exited
Change
−2.8M
Δ Own
−100.0%
Date
Q1 2026
BB
| Investor | Type | Est. change | Change | Δ Own | Date | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Brooklands Fund Management Ltd
· Exited
Change
−2.8M
Δ Own
−100.0%
Date
Q1 2026
|
Brooklands Fund Management Ltd | Exited· Q1 2026 | – | −2.8M | −100.0% | Q1 2026 | |||||
|
Viking Global Investors LP
· Reduced
Change
−2.6M
Δ Own
−17.7%
Date
Q1 2026
|
Viking Global Investors LP | Reduced· Q1 2026 | – | −2.6M | −17.7% | Q1 2026 | |||||
|
Citadel Advisors LLC
· Added
Change
+2.5M
Δ Own
+354.6%
Date
Q1 2026
|
Citadel Advisors LLC | Added· Q1 2026 | – | +2.5M | +354.6% | Q1 2026 | |||||
|
Janus Henderson Group PLC
· Added
Change
+2.2M
Date
Q1 2026
|
Janus Henderson Group PLC | Added· Q1 2026 | – | +2.2M | – | Q1 2026 | |||||
|
Norges
· Exited
Change
−1.5M
Δ Own
−100.0%
Date
Q1 2026
|
Norges | Exited· Q1 2026 | – | −1.5M | −100.0% | Q1 2026 | |||||
|
Jane Street Group, LLC
· Added
Change
+1.4M
Date
Q1 2026
|
Jane Street Group, LLC | Added· Q1 2026 | – | +1.4M | – | Q1 2026 | |||||
|
Two Sigma Advisers, LP
· Exited
Change
−1.4M
Δ Own
−100.0%
Date
Q1 2026
|
Two Sigma Advisers, LP | Exited· Q1 2026 | – | −1.4M | −100.0% | Q1 2026 | |||||
|
Polar Capital Holdings PLC
· Added
Change
+1.2M
Date
Q1 2026
|
Polar Capital Holdings PLC | Added· Q1 2026 | – | +1.2M | – | Q1 2026 | |||||
|
Two Sigma Investments, LP
· Added
Change
+1.2M
Δ Own
+60.3%
Date
Q1 2026
|
Two Sigma Investments, LP | Added· Q1 2026 | – | +1.2M | +60.3% | Q1 2026 | |||||
|
Capital Research Global Investors
· Reduced
Change
−1.2M
Δ Own
−60.5%
Date
Q1 2026
|
Capital Research Global Investors | Reduced· Q1 2026 | – | −1.2M | −60.5% | Q1 2026 | |||||
|
Paradigm Biocapital Advisors LP
· Exited
Change
−684K
Δ Own
−100.0%
Date
Q1 2026
|
Paradigm Biocapital Advisors LP | Exited· Q1 2026 | – | −684K | −100.0% | Q1 2026 | |||||
|
Millennium Management LLC
· Added
Change
+597K
Date
Q1 2026
|
Millennium Management LLC | Added· Q1 2026 | – | +597K | – | Q1 2026 | |||||
|
Driehaus Capital Management LLC
· Reduced
Change
−534K
Date
Q1 2026
|
Driehaus Capital Management LLC | Reduced· Q1 2026 | – | −534K | – | Q1 2026 | |||||
|
Diamant Asset Management, Inc.
· New
Change
+527K
Date
Q1 2026
|
Diamant Asset Management, Inc. | New· Q1 2026 | – | +527K | – | Q1 2026 | |||||
|
Geode
· Added
Change
+506K
Date
Q1 2026
|
Geode | Added· Q1 2026 | – | +506K | – | Q1 2026 | |||||
| Insider | Title | Type | Price | Qty | Value | Owned | ΔOwn | Trade date | Filed date | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Ellis Andrea
· Director
Sell
−$1.4M
|
Ellis Andrea | Director | Sell | $84.00 | −17K | −$1.4M | 23K | −43.2% | Jul 9, 2026 | Jul 13, 2026 | |||||||||
|
Ellis Andrea
· Director
2 operations
0
|
Ellis Andrea | Director | 2 operations | $16.75 | 0 | – | 17K | – | Jul 9, 2026 | Jul 13, 2026 | |||||||||
|
Cook Jennifer E.
· Director
2 operations
−$13M
|
Cook Jennifer E. | Director | 2 operations | $84.00–$90.00 | −149K | −$13M | 8K | −94.7% | Jul 9, 2026 | Jul 13, 2026 | |||||||||
|
Cook Jennifer E.
· Director
6 operations
0
|
Cook Jennifer E. | Director | 6 operations | $8.45–$29.00 | 0 | – | 0 | – | Jul 9, 2026 | Jul 13, 2026 | |||||||||
|
Cook Jennifer E.
· Director
Sell
−$2.6M
|
Cook Jennifer E. | Director | Sell | $70.00 | −37K | −$2.6M | 8K | −81.6% | Jun 24, 2026 | Jun 24, 2026 | |||||||||
|
Cook Jennifer E.
· Director
4 operations
0
|
Cook Jennifer E. | Director | 4 operations | $8.45–$16.75 | 0 | – | 17K | – | Jun 24, 2026 | Jun 24, 2026 | |||||||||
|
Cook Jennifer E.
· Director
Sell
−$151K
|
Cook Jennifer E. | Director | Sell | $68.57 | −2K | −$151K | 8K | −20.8% | Jun 23, 2026 | Jun 24, 2026 | |||||||||
|
Valantine Hannah
· Director
Sell
−$151K
|
Valantine Hannah | Director | Sell | $68.57 | −2K | −$151K | 9K | −19.2% | Jun 23, 2026 | Jun 24, 2026 | |||||||||
|
Cook Jennifer E.
· Director
2 operations
9K
|
Cook Jennifer E. | Director | 2 operations | – | 9K | – | 5K | – | Jun 22, 2026 | Jun 24, 2026 | |||||||||
|
Valantine Hannah
· Director
Sell
−$191K
|
Valantine Hannah | Director | Sell | $68.00 | −3K | −$191K | 11K | −19.7% | Jun 22, 2026 | Jun 24, 2026 | |||||||||
|
Valantine Hannah
· Director
2 operations
0
|
Valantine Hannah | Director | 2 operations | $41.73 | 0 | – | 6K | – | Jun 22, 2026 | Jun 24, 2026 | |||||||||
|
Valantine Hannah
· Director
2 operations
9K
|
Valantine Hannah | Director | 2 operations | – | 9K | – | 5K | – | Jun 22, 2026 | Jun 24, 2026 | |||||||||
|
Lo Andrew
· Director
2 operations
9K
|
Lo Andrew | Director | 2 operations | – | 9K | – | 5K | – | Jun 22, 2026 | Jun 24, 2026 | |||||||||
|
Homcy Charles J.
· Director
2 operations
9K
|
Homcy Charles J. | Director | 2 operations | – | 9K | – | 5K | – | Jun 22, 2026 | Jun 24, 2026 | |||||||||
|
Aguiar Eric
· Director
2 operations
9K
|
Aguiar Eric | Director | 2 operations | – | 9K | – | 5K | – | Jun 22, 2026 | Jun 24, 2026 | |||||||||
N
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446 reporting institutions disclosed BBIO 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.