RA CAPITAL MANAGEMENT, L.P. - 09 Feb 2026 SCHEDULE 13D Report for SPYGLASS PHARMA, INC. Common Stock, $0.00001 par value per share

Filing Manager
RA CAPITAL MANAGEMENT, L.P.
Reporting Manager
RA Capital Management, L.P.
Security
SPYGLASS PHARMA, INC. Common Stock, $0.00001 par value per share
Shares outstanding
33,288,959 shares
Disclosed Ownership
8,022,639 shares
Ownership
24%
Form type
SCHEDULE 13D
Filing time
17 Feb 2026, 19:21:40 UTC
Date of event
09 Feb 2026
SEC
View on sec.gov

Reporting Managers (5)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
RA Capital Management, L.P. 24% 8,022,639 0 8,022,639 /s/ Peter Kolchinsky By Peter Kolchinsky, Authorized Signatory 0001346824
Peter Kolchinsky 24% 8,022,639 0 8,022,639 /s/ Peter Kolchinsky Peter Kolchinsky 0001384859
Rajeev Shah 24% 8,022,639 0 8,022,639 /s/ Rajeev Shah Rajeev Shah 0001619841
RA Capital Healthcare Fund, L.P. 18% 5,966,439 0 5,966,439 /s/ Peter Kolchinsky By RA Capital Healthcare Fund GP, LLC, its General Partner, By Peter Kolchinsky, Manager 0001315082
RA Capital Nexus Fund III, L.P. 6.2% 2,054,678 0 2,054,678 /s/ Peter Kolchinsky By RA Capital Nexus Fund III GP, LLC, its General Partner, By Peter Kolchinsky, Manager 0001883840