Which hedge funds own SPRO? SPERO THERAPEUTICS INC, Q2 2026 13F holders

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8 of the hedge funds tracked by WhaleCreep disclosed a position in SPRO (SPERO THERAPEUTICS INC) in their Q2 2026 13F filings, worth $2.6m in total. The largest holder by portfolio weight is Ionic Capital Management LLC at 0.2% of its book. 3 managers opened a new position this quarter: Arrowstreet Capital, Limited Partnership, Qube Research & Technologies LTD, Millennium Management LLC. 6 exited: Anson Funds Management LP, Intrepid Family Office LLC, Marshall Wace, LLP.

Who discovered SPRO first?

Earliest meaningful positions among the 4 tracked managers we observed opening SPRO since Q4 2017.

1 RC RA Capital Management, L.P. First reported Q4 2017 1.2%initial weight · $14.4m Exitedby Q3 2018 · held 3q +25%stock since Q4 2017

Weight of RA Capital Management, L.P.'s 13F book in SPRO, by quarter

• 1.2% peak weight, Q4 2017
• $14.4m peak reported value
• 3 quarters held
• 34q before the median tracked entry

The stock's split-adjusted price moved +25% between Q4 2017 and Q2 2018, the last quarter this manager reported the position.

12 managers already held SPRO when our coverage of them began

Ionic Capital Management LLC (Q1 2026), Verdad Advisers, LP (Q1 2026), Gsa Capital Partners LLP (Q1 2026), Fny Investment Advisers, LLC (Q1 2026), Two Sigma Investments, LP (Q1 2026), Anson Funds Management LP (Q1 2026), Citadel Advisors LLC (Q1 2026), Intrepid Family Office LLC (Q1 2026), Marshall Wace, LLP (Q1 2026), Occudo Quantitative Strategies LP (Q1 2026), Schonfeld Strategic Advisors LLC (Q1 2026), Squarepoint Ops LLC (Q1 2026).

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

View discovery timeline

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 SPRO, 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 SPRO passed one third and two thirds of its peak.

Which hedge funds hold SPRO? 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 SPRO changed?

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