RARENasdaq · Pharmaceutical Preparations

Ultragenyx Pharmaceutical Inc.

Alert me on RARE

Insider buys, 6 months

Congress trades, 6 months

Signals, 6 months

Six months

After each filing

Oct 19 Sale Horn Howard Insider

1 week

Result in1 trading day

1 month

Result in17 trading days

3 months

Result in59 trading days

6 months

Result in122 trading days

Oct 12 Buy Rep. Gilbert Cisneros House

1 week

+7.4%S&P −1.2%

1 month

Result in13 trading days

3 months

Result in55 trading days

6 months

Result in118 trading days

Sep 16 Sale Huizenga Theodore Alan Insider

1 week

+15.5%S&P +2.1%

1 month

+17.8%S&P +2.6%

3 months

Result in36 trading days

6 months

Result in99 trading days

Sep 8 Sale Huizenga Theodore Alan Insider

1 week

−12.2%S&P −1.1%

1 month

+0.1%S&P +1.7%

3 months

Result in30 trading days

6 months

Result in93 trading days

Aug 4 Sale Horn Howard Insider

1 week

+4.5%S&P −0.1%

1 month

+2.8%S&P −0.8%

3 months

Result in6 trading days

6 months

Result in69 trading days

Show all 34

Aug 4 Sale Parschauer Karah Herdman Insider

1 week

+4.5%S&P −0.1%

1 month

+2.8%S&P −0.8%

3 months

Result in6 trading days

6 months

Result in69 trading days

Jul 6 Sale Horn Howard Insider

1 week

−1.4%S&P −0.3%

1 month

−23.4%S&P +2.7%

3 months

−54.8%S&P +2.7%

6 months

Result in48 trading days

Jun 16 Sale Parschauer Karah Herdman Insider

1 week

+17.1%S&P −2.0%

1 month

+17.8%S&P −0.7%

3 months

−48.2%S&P +0.8%

6 months

Result in36 trading days

Jun 16 Sale Sanders Corazon (Corsee) D. Insider

1 week

+17.1%S&P −2.0%

1 month

+17.8%S&P −0.7%

3 months

−48.2%S&P +0.8%

6 months

Result in36 trading days

Jun 2 Sale Horn Howard Insider

1 week

+4.6%S&P −3.0%

1 month

+53.7%S&P −1.7%

3 months

+18.5%S&P +0.5%

6 months

Result in26 trading days

May 19 Sale SULIMAN SHEHNAAZ Insider

1 week

+4.2%S&P +2.3%

1 month

+22.2%S&P +2.0%

3 months

+16.9%S&P +5.1%

6 months

Result in17 trading days

May 6 Sale Crombez Eric Insider

1 week

+2.0%S&P +1.2%

1 month

−15.5%S&P +0.5%

3 months

−0.4%S&P +5.0%

6 months

Result in8 trading days

May 5 Sale Horn Howard Insider

1 week

+7.3%S&P +2.0%

1 month

−6.8%S&P +4.6%

3 months

−0.3%S&P +6.6%

6 months

Result in7 trading days

Apr 7 Buy Rep. Gilbert Cisneros House

1 week

+8.8%S&P +3.5%

1 month

+12.9%S&P +8.2%

3 months

+49.5%S&P +11.5%

6 months

−35.7%S&P +15.6%

Apr 3 Sale Horn Howard Insider

1 week

+3.3%S&P +4.1%

1 month

+9.4%S&P +9.8%

3 months

+56.8%S&P +13.8%

6 months

−36.6%S&P +18.2%

Mar 11 Sale Parschauer Karah Herdman Insider

1 week

−7.9%S&P −2.2%

1 month

+4.9%S&P +0.7%

3 months

+3.4%S&P +7.6%

6 months

−35.2%S&P +12.6%

Mar 9 Buy Rep. Gilbert Cisneros House

1 week

−5.4%S&P −0.9%

1 month

+4.7%S&P +0.7%

3 months

−0.2%S&P +9.1%

6 months

−37.3%S&P +13.2%

Mar 4 Sale Horn Howard Insider

1 week

+1.9%S&P −1.3%

1 month

+3.0%S&P −4.0%

3 months

+2.8%S&P +10.4%

6 months

+21.7%S&P +12.3%

Mar 4 Sale Parschauer Karah Herdman Insider

1 week

+1.9%S&P −1.3%

1 month

+3.0%S&P −4.0%

3 months

+2.8%S&P +10.4%

6 months

+21.7%S&P +12.3%

Mar 4 Sale KAKKIS EMIL D Insider

1 week

+1.9%S&P −1.3%

1 month

+3.0%S&P −4.0%

3 months

+2.8%S&P +10.4%

6 months

+21.7%S&P +12.3%

Mar 4 Sale Pinion John Richard Insider

1 week

+1.9%S&P −1.3%

1 month

+3.0%S&P −4.0%

3 months

+2.8%S&P +10.4%

6 months

+21.7%S&P +12.3%

Mar 4 Sale Crombez Eric Insider

1 week

+1.9%S&P −1.3%

1 month

+3.0%S&P −4.0%

3 months

+2.8%S&P +10.4%

6 months

+21.7%S&P +12.3%

Mar 4 Sale Huizenga Theodore Alan Insider

1 week

+1.9%S&P −1.3%

1 month

+3.0%S&P −4.0%

3 months

+2.8%S&P +10.4%

6 months

+21.7%S&P +12.3%

Mar 4 Sale Harris Erik Insider

1 week

+1.9%S&P −1.3%

1 month

+3.0%S&P −4.0%

3 months

+2.8%S&P +10.4%

6 months

+21.7%S&P +12.3%

Feb 3 Sale Horn Howard Insider

1 week

−2.4%S&P +0.4%

1 month

−13.5%S&P −1.2%

3 months

+0.8%S&P +5.3%

6 months

+0.5%S&P +12.2%

Jan 6 Sale Horn Howard Insider

1 week

+7.0%S&P +0.3%

1 month

+5.5%S&P −2.1%

3 months

+2.7%S&P −2.0%

6 months

+53.5%S&P +9.2%

Dec 30, 2025 Sale Huizenga Theodore Alan Insider

1 week

+6.2%S&P +0.4%

1 month

+5.7%S&P +0.7%

3 months

−6.0%S&P −4.4%

6 months

+46.9%S&P +9.0%

Dec 11, 2025 Sale Horn Howard Insider

1 week

−9.3%S&P −1.8%

1 month

−33.4%S&P +1.0%

3 months

−39.7%S&P −2.6%

6 months

−29.9%S&P +10.2%

Oct 14, 2025 Sale Horn Howard Insider

1 week

+7.9%S&P +1.4%

1 month

+5.8%S&P +3.2%

3 months

−24.0%S&P +4.6%

6 months

−22.6%S&P +6.6%

Sep 20, 2025 Sale Huizenga Theodore Alan Insider

1 week

+3.0%S&P −0.5%

1 month

+16.0%S&P +0.7%

3 months

+13.7%S&P +2.4%

6 months

−37.2%S&P −1.5%

Sep 13, 2025 Sale Parschauer Karah Herdman Insider

1 week

+1.6%S&P +1.2%

1 month

+9.3%S&P +0.5%

3 months

+24.9%S&P +3.4%

6 months

−25.5%S&P +2.1%

Sep 12, 2025 Buy Rep. Gilbert Cisneros House

1 week

+1.6%S&P +1.2%

1 month

+9.3%S&P +0.5%

3 months

+24.9%S&P +3.4%

6 months

−25.5%S&P +2.1%

Sep 8, 2025 Sale Huizenga Theodore Alan Insider

1 week

−8.0%S&P +1.9%

1 month

−5.6%S&P +3.4%

3 months

+15.5%S&P +6.0%

6 months

−27.5%S&P +5.0%

Aug 14, 2025 Buy Rep. Gilbert Cisneros House

1 week

+0.3%S&P +0.3%

1 month

−0.7%S&P +2.6%

3 months

+10.8%S&P +4.7%

6 months

−32.0%S&P +6.7%

Every purchase and sale on this ticker reported by a member of Congress or an insider, measured from the close of the first trading day after it became public to the close 1 week, 1 month, 3 months and 6 months later, each beside the S&P over the same days.

Filings for RARE

78 held · newest 578 held · newest 2

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See all 78 filings for RARE

Aeon news and offers by email

New sources, new features and offers like our founding price. A few times a month at most. Stop any time.

Signal history

No signal for this ticker yet. A signal is written when insider buying here scores one dot or more.

Stakes

Oct 13, 2026 Schedule 13G

Madison Avenue International LP: 6.4%, 6,307,798 shares

Jun 30, 2026 Schedule 13G

RTW Investments, LP: 7.9%, 7,796,895 shares

Jun 30, 2026 Schedule 13G

AQR Capital Management, LLC: 6.7%, 6,560,809 shares

Jun 30, 2026 Schedule 13G

STATE STREET CORPORATION: 6.3%, 6,158,766 shares

Jun 30, 2026 Schedule 13G, amended

Vanguard Portfolio Management: 7%, 6,853,427 shares

Jun 30, 2026 Schedule 13G

Vanguard Capital Management: 5.1%, 5,058,419 shares

Jun 30, 2026 Schedule 13G, amended

BlackRock, Inc.: 8.3%, 8,141,384 shares

Mar 31, 2026 Schedule 13G

STATE STREET CORPORATION: 5.1%, 5,021,441 shares

Mar 31, 2026 Schedule 13G

Vanguard Portfolio Management: 5.5%, 5,410,208 shares

Mar 13, 2026 Schedule 13G, amended

The Vanguard Group: 0%, 0 shares

Dec 31, 2025 Schedule 13G, amended

FMR LLC: 3.5%, 3,347,890 shares

Sep 30, 2025 Schedule 13G

FMR LLC: 8.3%, 7,964,937 shares

Schedule 13D is filed within 5 business days of crossing 5 percent by an investor who may seek to influence the company. Schedule 13G is filed by a passive holder, and a large institution has up to 45 days after the quarter end.

Government contracts, last 12 months

Awards of $10M and up, from USAspending · context, not a signal

No contracts of $10M or more in the last 12 months.

Lobbying

Last four quarters

$130KQ4 2025

$440KQ1 2026

$390KQ2 2026

$280KQ3 2026

Down 28 percent from Q2 2026. Reported by the company to the Senate each quarter.Original report ↗

Read from LDA.gov between Sep 23, 2026 and Oct 21, 2026. Senate Office of Public Records cannot vouch for the data or analyses derived from these data after the data have been retrieved from LDA.gov.