Renaissance Technologies LLC

SEC CIK: 0001037389
Latest filing: Aug 13, 2026

SEC filings (opens in a new tab)

UPB holding history

Upstream Bio, Inc. in every 13F filed by Renaissance Technologies LLC, including the quarters it was sold out or no filing was made. Changes compare share counts with the previous calendar quarter.

UPB overview All 13F holders of UPB Full Q2 2026 holdings

Shares (Q2 2026): 131,300
Value: $908.6K
% of portfolio: <0.1%
Quarters held: 3; Since Q4 2025

Holdings of UPB by Renaissance Technologies LLC, by quarter
Quarter	Shares	Value	% of portfolio	Share change	Action	All holders
Q2 2026	131,300	$908.6K	<0.1%	+69,200+111.4%	Added	Holders
Q1 2026	62,100	$558.9K	<0.1%	+45,700+278.7%	Added	Holders
Q4 2025	16,400	$445.3K	<0.1%	+16,400	New	Holders