SPRO — SPERO THERAPEUTICS INC

Ownership history in PFIZER INC  ·  5 quarters on record

This page tracks every 13F SEC filing in which PFIZER INC 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
2.33% (2025 Q4)
Avg. % of fund
0.99%
First filed
2024 Q4
Last filed
2025 Q4
Quarters held
5
Quarter Action Shares Change Chg % % of Fund Mkt Value Price (EOQ)
2025 Q4 UNCHANGED 2,362,348 — 0% 2.33% $5.5M $2.33
2025 Q3 UNCHANGED 2,362,348 — 0% 1.02% $4.4M $1.88
2025 Q2 UNCHANGED 2,362,348 — 0% 1.19% $6.9M $2.90
2025 Q1 UNCHANGED 2,362,348 — 0% 0.34% $1.70B $0.72
1 older quarter hidden  —  Sign in free or upgrade to Premium to see full history
% 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% INTREPID FAMILY OFFICE LLC 3Y 0.33% Anson Funds Management LP 3Y 7Y 0.14% Alphabet Inc. 3Y 0.08% Ionic Capital Management LLC 3Y 7Y 0.06% 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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