$RARE

$16.75 +$0.67 (4.17%) Close

$RARE Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 98.6M shares outstanding

Who owns RARE?

By type of holder

Institutions 100.0% Insiders 0.0% Everyone else 0.0%

Concentration Top 10 holders own 63.5%

Kakkis Emil D 12.1% · BlackRock, Inc. 10.8%

Institutional ownership

100.0%

+0.5 pts vs last qtr

Institutional holders

310

+13 vs last qtr

Net shares bought

+8.4M

by institutions in Q2 2026

New / sold out

59 / 46

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

RTW Investments, LP +4.1M
BlackRock, Inc. +3.4M

Biggest sellers in Q2 2026

Assenagon Asset Management S.A. −2.1M
Citadel Advisors LLC −1.9M

Who is planning to sell?

Notices of proposed sale, last 12 months

$1.47M

16 notices from 5 people

Shares covered

59.8K

0.06% of the company

Arranged in advance

82%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Howard Horn Officer 10b5-1 $961K
Karah Parschauer Officer $301K

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2020–FY2025

+62.0%

+10.14% a year

Each share's claim on the business

−38.3%

shrank without buying or selling a share

Diluted shares, split-adjusted

How patient are the owners?

Institutional shares by how long they've been held

5+ years47% 3–5 years20% 1–3 years19% Under 1 year15%

Quarterly turnover

23.8%

of institutional shares changed hands

Top 10 managers, median time held

4.5 years

Super Investors

Investment managers reporting RARE on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	10.7M	10.81%	+3.4M (+46.0%)	≤2021	0.0%
Shares held by quarter Peak holding10.7M (Q2'26) Change over 8 quarters+4.8M Share of the company10.810% BlackRock, Inc.'s full portfolio →
RI RTW Investments, LP	7.8M	7.91%	+4.1M (+113.7%)	2021	2.2%
Shares held by quarter Peak holding7.8M (Q2'26) Change over 8 quarters+5.8M Share of the company7.910% RTW Investments, LP's full portfolio →

BlackRock, Inc.

10.7M

% of company

10.81%

Change vs last qtr

+3.4M (+46.0%)

Held since

≤2021

RTW Investments, LP

7.8M

% of company

7.91%

Change vs last qtr

+4.1M (+113.7%)

Held since

2021

28 more super investors behind a free account

See every manager holding Ultragenyx Pharmaceutical Inc., how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting RARE on Form N-PORT; together they hold 34.3% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
SS State Street(R) SPDR(R) S&P(R) Biotech ETF SPDR Series Trust	$122M	3.7M	3.72%	1.14%	June 30, 2026
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$99.7M	3.0M	3.03%	0.00%	June 30, 2026

State Street(R) SPDR(R) S&P(R) Biotech ETF

SPDR Series Trust

Position value

$122M

% of company

3.72%

% of the fund

1.14%

As of

June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$99.7M

% of company

3.03%

% of the fund

0.00%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Ultragenyx Pharmaceutical Inc. and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
KE Kakkis Emil D Insider	11.9M	12.06%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company12.060% Kakkis Emil D's insider activity →
KT Kassberg Thomas Richard Insider	264.7K	0.27%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.270% Kassberg Thomas Richard's insider activity →

Kakkis Emil D

Insider

11.9M

% of company

12.06%

Change vs last qtr

—

Held since

—

Kassberg Thomas Richard

Insider

264.7K

% of company

0.27%

Change vs last qtr

—

Held since

—

14 more holders behind a free account

See every insider and 5%+ holder of Ultragenyx Pharmaceutical Inc..

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