SPRO — SPERO THERAPEUTICS INC

Ownership history in Ionic Capital Management LLC  ·  3 quarters on record

This page tracks every 13F SEC filing in which Ionic Capital Management LLC reported a position in SPERO THERAPEUTICS INC (SPRO). Data includes quarterly share count, position size as % of portfolio, estimated market value, and end-of-quarter stock price — sourced directly from SEC EDGAR 13F filings.

Peak position
0.12% (2025 Q2)
Avg. % of fund
0.07%
First filed
2025 Q2
Last filed
2025 Q4
Quarters held
3
Quarter Action Shares Change Chg % % of Fund Mkt Value Price (EOQ)
2025 Q4 REDUCED 195,939 -12,786 -6.1% 0.06% $457K $2.33
2025 Q3 ADDED 208,725 +58,725 +39.1% 0.04% $392K $1.88
2025 Q2 INITIATED 150,000 — — 0.12% $435K $2.90
% of Fund (quarterly)    SPRO price (monthly, adj. close)

Other funds also holding SPRO

As of 2025 Q4 — sorted by position size

GSK plc 2.68% PFIZER INC 2.33% INTREPID FAMILY OFFICE LLC 3Y 0.33% Anson Funds Management LP 3Y 7Y 0.14% Alphabet Inc. 3Y 0.08% Informed Momentum Co LLC 3Y 7Y 0.06% GSA CAPITAL PARTNERS LLP 3Y 7Y 0.04% ADAR1 Capital Management, LLC 0.02% Shay Capital LLC 3Y 0.01% Torrey Growth & Income Advisors 0.01%
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