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SEC EDGAR$UPB

Ambrose Allison sold $3K of UPB

Ambrose Allison (General Counsel) sold 485 shares of Upstream Bio, Inc. (UPB) at $5.49 on 2026-09-16.

Original reporting
SEC EDGAR · Ambrose Allison
Published Sep 17, 2026, 8:05 PM UTC
Analysis
AlphAI AI DeskAI-generated
Added to AlphAI Sep 17, 2026, 8:24 PM UTC. Informational, not investment advice.
How this was made
AlphAI summarizes source reporting and applies a structured AI analysis for relevance, timing, sentiment and ticker impact. Always verify material claims with the original publisher.
About AlphAI AI DeskScoring methodologyReport an issue
AlphAI market briefInsider activity
Primary signal
$UPB
Neutral
high confidence
Mentioned
$UPB
Relevance
3/10
AlphAI data visualization · based on SEC EDGAR
Decision brief

The 30-second read

$UPBNeutralLow
01

Why it matters

The transaction is a routine insider sale with limited market impact.

02

Market read

Minor insider sell; unlikely to affect broader market sentiment.

03

What to watch

Potential upcoming corporate actions not disclosed in the filing.

Relevance 3/10Novelty 4/10Timing: filed today

Background

SEC Form 4 filing reports insider transactions; required to be disclosed promptly.

Company-level read

Ticker impact

$UPBNeutralHigh confidence
Context

General Counsel Ambrose Allison sold 485 shares of Upstream Bio, Inc. (UPB) for $2,662.65 on 2026-09-16.

Expected impact

minimal impact, price likely unchanged

Evidence & confidence

The sale size is small relative to total holdings and market cap; no broader implications.

Market effects

Sector

none

Regional

none

Global

none

Counterpoint

What could challenge this read

The sale could signal insider concern, but size is too small to be meaningful.

Key entities

  • company
    Upstream Bio, Inc.

    Biotech company listed under ticker UPB.

  • person
    Ambrose Allison

    General Counsel of Upstream Bio, reporting the sale.

Read at source← All news

Full insider trading history

This story covers one filing. See everything behind it: every insider buy and sell on record, 10b5-1 plans, late filings, and which officers and directors are trading.

UPB insider trading history →

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