This chart shows the top 10 superinvestors based on the number of shares they owned in 2025-Q4 and 2026-Q1. According to the most recent SEC 13F filing, 143 superinvestors own shares of Upstream Bio Inc (UPB), although recent data may remain incomplete due to pending filings.

This chart highlights the quarter-over-quarter change (%) in the number of superinvestors holding Upstream Bio Inc (UPB), the total shares they held, and the total reported dollar value. It gives a clear view of whether there is ongoing momentum. The dotted lines at the top and bottom adjust longer bars to keep smaller data points visible for better comparison.

This chart shows superinvestors' activity with Upstream Bio Inc (UPB) over the last four quarters, highlighting the percentage of investors who added, increased, decreased, held, or exited their positions, revealing shifts in sentiment over time.

This chart displays superinvestors' past actions with Upstream Bio Inc (UPB) over the last 10 years (40 quarters), helping to visualize the collective momentum and investment trends over time.