Which hedge funds own PBYI? PUMA BIOTECHNOLOGY INC, Q2 2026 13F holders

Healthcare · Open on the interactive board

11 of the hedge funds tracked by WhaleCreep disclosed a position in PBYI (PUMA BIOTECHNOLOGY INC) in their Q2 2026 13F filings, worth $20.2m in total. The largest holder by portfolio weight is Spark Investment Management LLC at 0.3% of its book. 4 managers opened a new position this quarter: Spark Investment Management LLC, Y-Intercept (Hong Kong) LTD, Trexquant Investment LP, Quarry LP. 2 exited: Citadel Advisors LLC, Engineers Gate Manager LP.

Who discovered PBYI first?

Earliest meaningful positions among the 11 tracked managers we observed opening PBYI since Q3 2014.

1 MA Melqart Asset Management (uk) LTD First reported Q2 2018 1.5%initial weight · $17.1m Exitedby Q4 2019 · held 4q –stock change

Weight of Melqart Asset Management (uk) LTD's 13F book in PBYI, by quarter

• 3.4% peak weight, Q4 2018
• $23.6m peak reported value
• 4 quarters held, in 2 separate spells
• 7q before the median tracked entry

9 managers already held PBYI when our coverage of them began

EntryPoint Capital, LLC (Q1 2026), Prelude Capital Management, LLC (Q1 2026), Millennium Management LLC (Q1 2026), Aqr Capital Management LLC (Q1 2026), Arrowstreet Capital, Limited Partnership (Q1 2026), D. E. Shaw & Co., Inc. (Q1 2026), Two Sigma Investments, LP (Q1 2026), Citadel Advisors LLC (Q1 2026), Engineers Gate Manager LP (Q1 2026).

Their first filing on record already includes PBYI, so when they first bought it is unknown. They are not ranked above.

View discovery timeline

1. Early holdersQ3 2014 – Q2 20184 new tracked holders · 1.8% of tracked managers holding at the end
2. Established ownershipQ3 2018 – now7 new tracked holders · 0.9% of tracked managers holding now

Dots mark the ranked managers' first reported quarters. Price is the quarter-end price implied by 13F filings, split-adjusted, shown from Q1 2026 where the series is continuous. Coverage widened in Q1 2026 from about a hundred managers to over a thousand, so holders and new holders are shown relative to the managers filing each quarter.

How this is calculated

13F filings are quarterly snapshots of long US-listed equity positions. They do not show exact purchase dates, intra-quarter trading, short positions, most derivatives, or a manager's actual performance. "First reported" is the first quarter-end filing that shows the position.

A manager is ranked only if we observed it filing, without PBYI, within two quarters before its first position. Ranking is by the first quarter the position reached 1% of the manager's 13F book in a run of at least 2 filings, then by peak weight. "High conviction" means a peak weight of at least 5%.

Stock changes are the split-adjusted change in the quarter-end price implied by 13F filings, excluding dividends. They describe the stock over the period, not the return any manager earned. Phases are cut where the share of tracked managers holding PBYI passed one third and two thirds of its peak.

Which hedge funds hold PBYI? Current holders by portfolio weight

Exited since the previous quarter

Held in a manager's last filing on record

These managers have not filed for the latest quarter; their last disclosure is dated.

How has hedge fund ownership of PBYI changed?

Counts every tracked manager that disclosed PBYI in that quarter's filing, including managers that have since stopped filing.