StockCIK 1515673

Ultragenyx Pharmaceutical Inc. (RARE): Insider Trades and Fund Holdings

In the past 12 months, Ultragenyx Pharmaceutical Inc. insiders reported 0 open-market purchases worth $0 and 3 sales worth $128K; 1 of the sales were reported as made under a 10b5-1 trading plan.

0Insider buys, 12 months

$0Bought by insiders, 12 months

$128KSold by insiders, 12 months

1Tracked funds holding

Recent insider trades

Open-market purchases (code P) and sales (code S) from Form 4. Grants, option exercises and gifts are not shown. Latest filing: Oct 19, 2026.

Recent RARE insider trades
Filed	Traded	Insider	Role	Type	Shares	Price ($)	Value	Holding	Filing
Oct 19	Oct 15	Howard HornCFO	CFO	▼ SELL	7,066	15.27	$108K	−7.3%	Form 4 ↗
Sep 15	Sep 15	Theodore Alan HuizengaCAO	CAO	▼ SELL10b5-1	1,283	13.57	$17K	−1.9%	Form 4 ↗
Sep 8	Sep 3	Theodore Alan HuizengaCAO	CAO	▼ SELL	161	13.99	$2K	−0.2%	Form 4 ↗

Source: SEC Form 4 filings, retrieved Oct 28, 2026. How we read filings

Insiders who traded in the past year

Insider	Role	Buys	Bought	Sells	Sold	Latest
Howard Horn	CFO	0	$0	1	$108K	Oct 19, 2026
Theodore Alan Huizenga	CAO	0	$0	2	$20K	Sep 15, 2026

Tracked funds that report RARE

From each fund's latest 13F. Holdings are as of quarter end and are filed up to 45 days later.

Fund	Quarter	Shares	Value	% of portfolio	Change
Renaissance Technologies	Q2 2026	413,700	$13.8M	0.02%	▼ −26.3%

Source: SEC Form 13F-HR filings, retrieved Oct 28, 2026. How we read filings

Reading these numbers

Insiders sell for many reasons: taxes, diversification, a house. Purchases with their own money are rarer and are usually read as more informative. A Form 4 is due within two business days of the trade. How to read a Form 4 →