$RARE

Horn Howard sold $117K of RARE

Horn Howard (Chief Financial Officer) sold 4,696 shares of Ultragenyx Pharmaceutical Inc. (RARE) at $24.92 ($0.12M total) on 2026-08-03 under a Rule 10b5-1 trading plan.

Original reporting
SEC EDGAR · Horn Howard
Published Aug 4, 2026, 4:00 PM UTC
Analysis
AlphAI AI DeskAI-generated
Added to AlphAI Aug 6, 2026, 6:19 AM 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.
AlphAI market briefInsider activity
Primary signal
$RARE
Neutral
high confidence
Mentioned
$RARE
Relevance
3/10
AlphAI data visualization · based on SEC EDGAR
Decision brief

The 30-second read

$RARENeutralLow
01

Why it matters

The newest fact is the CFO’s planned open-market sale amount, price, and post-transaction holdings. It can be used for sentiment monitoring but does not introduce new fundamentals in the provided text.

02

Market read

Traders may note insider selling, but the 10b5-1 framing suggests limited incremental information content.

03

What to watch

The article provides only the sale details; it does not include any offsetting insider buys, changes in guidance, or operational/clinical updates that would justify a stronger trading view.

Relevance 3/10Novelty 3/10Timing: filed Aug 4, transaction dated Aug 3

Background

The article is a SEC Form 4 insider transaction disclosure for Ultragenyx Pharmaceutical Inc.

Company-level read

Ticker impact

$RARENeutralHigh confidence
Context

Ultragenyx CFO Horn Howard filed a Form 4 showing an open-market sale of 4,696 shares at $24.92 on Aug 3 under a 10b5-1 plan.

Expected impact

Low likelihood of a sustained price move; any reaction is likely limited and short-lived.

Evidence & confidence

The filing is a routine 10b5-1 planned sale by the CFO, with no accompanying guidance, deal, or regulatory/clinical catalyst in the text.

Market effects

Minimal. Insider 10b5-1 sales are common and do not, by themselves, signal sector-wide changes.

None indicated.

None indicated.

Counterpoint

Because the sale is explicitly under a pre-arranged 10b5-1 plan, it may reflect liquidity planning rather than bearish expectations.

Key entities

  • Ultragenyx Pharmaceutical Inc.

    Subject of the Form 4 insider transaction disclosure.

  • Horn Howard

    Chief Financial Officer who sold shares under a 10b5-1 plan.

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.

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