Adam Houghton, Chief Business Officer at Upstream Bio, Inc. (UPB), sold 700 shares at $5.49 ($4K) on 2026-09-16, disclosed to the SEC on 2026-09-17.
Open-market sale of $4k UPB by Chief Business Officer. Not flagged as scheduled, tax-driven, or recurring — but no specific bearish signal from our filters. Reasons for insider sales vary widely.
Nothing distinguishes this filing.
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