UPB Allison Ambrose sold Upstream Bio, Inc. shares — SEC Form 4SELLUpstream Bio, Inc.

Allison Ambrose, General Counsel at Upstream Bio, Inc. (UPB), sold 475 shares at $9.29 ($4K) on 2026-03-16, disclosed to the SEC on 2026-03-17.

SEC EDGAR Filing

0001193125-26-111121

View on SEC EDGAR

Trade context

Open-market sale of $4k UPB by General Counsel. Not flagged as scheduled, tax-driven, or recurring — but no specific bearish signal from our filters. Reasons for insider sales vary widely.

Modest58/100

Nothing distinguishes this filing.

Opportunistic Sell

Trade Context

•Decreased holdings by 3%
•4 other insiders also sold in last 30 days
•Stock down -69% in previous 3 months

Filing Info

Filed2026-03-17

Traded2026-03-16

Accession0001193125-26-111121

SourceSEC EDGAR (Live)

Insider

NameAllison Ambrose

TitleGeneral Counsel

PIT GradeInsiderUnrated

View Company View Insider

Related Trades by This Insider

Ticker	Type	Filed	Value	7d Stock	Filing
UPB	SELL	2026-09-17	$3K	—	Filing →
UPB	SELL	2026-06-17	$3K	—

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UPB Allison Ambrose sold Upstream Bio, Inc. shares — SEC Form 4SELLUpstream Bio, Inc.

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Filing Info

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