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SEC EDGAR$UPB

GRAY MICHAEL sold $5K of UPB

GRAY MICHAEL (CFO and COO) sold 853 shares of Upstream Bio, Inc. (UPB) at $5.49 on 2026-09-16.

Original reporting
SEC EDGAR · GRAY MICHAEL
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 CFO's sale is modest and unlikely to move the stock.

02

Market read

A routine insider sale with limited trading relevance.

03

What to watch

No other material news about Upstream Bio accompanies the filing.

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

Background

Form 4 filings disclose insider transactions and are primary sources for such events.

Company-level read

Ticker impact

$UPBNeutralHigh confidence
Context

CFO Michael Gray sold 853 shares of Upstream Bio for $4,683, reducing his stake to 27,942 shares.

Expected impact

Likely negligible impact on UPB price.

Evidence & confidence

The transaction size is small relative to market cap and does not signal a material change in insider confidence.

Market effects

Sector

None

Regional

None

Global

None

Counterpoint

What could challenge this read

The sale could be a routine portfolio rebalancing, not a negative signal.

Key entities

  • Company
    Upstream Bio, Inc.

    Biotech firm listed under ticker UPB.

  • Executive
    Michael Gray

    CFO and COO of Upstream Bio.

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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