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RARE in the 13F filings

Ultragenyx Pharmaceutical In · CUSIP 90400D108

Sector · Pharmaceuticals and biotechnologyTheme · Healthcare: biopharma and medtech· L3VLUP-definedTheme · Pharmaceutical preparations
Quarter
Q2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023Q3 2023
Quarter end
30 Jun 2026
the date the book describes
Filed
2 Sep 2026
latest of these filings; the earliest 3 Aug 2026
Managers listing it
27
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q1 2026 and Q2 2026; 5 listed it in both
Shares listed
20,093,390
combined, among listed positions
Reported value
$664m
combined, at the quarter end

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 11 buyers (opened or added shares) and 17 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was -2,209,043.

Managers listing RARE in Q2 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q1 2026, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

27 of 27 holders

ActionFiling
AQR Capital Management LLC6,560,809$214m0.07%Added+1,982,78514 Aug 2026 (the filing on sec.gov)
Two Sigma Investments LP3,621,200$121m0.09%Added+1,415,38014 Aug 2026 (the filing on sec.gov)
D. E. Shaw & Co.1,730,193$58munder 0.1%Added+469,17514 Aug 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc1,356,501$45munder 0.1%Added+552,39214 Aug 2026 (the filing on sec.gov)
Wellington Management Group LLP1,250,464$42munder 0.1%Trimmed-1,390,34814 Aug 2026 (the filing on sec.gov)
Voloridge Investment Management LLC1,241,556$41m0.18%Trimmed-185,27814 Aug 2026 (the filing on sec.gov)
Millennium Management LLC760,825$25munder 0.1%Trimmed-1,011,35914 Aug 2026 (the filing on sec.gov)
Fidelity (FMR LLC)576,849$19munder 0.1%Added+289,53313 Aug 2026 (the filing on sec.gov)
Renaissance Technologies LLC413,700$14munder 0.1%Trimmed-148,00013 Aug 2026 (the filing on sec.gov)
Squarepoint Ops LLC338,368$11munder 0.1%Trimmed-106,17114 Aug 2026 (the filing on sec.gov)
Walleye Capital LLC334,854$11munder 0.1%Added+215,1493 Aug 2026 (the filing on sec.gov)
MFS Investment Management272,882$9.1munder 0.1%Added+12,4973 Aug 2026 (the filing on sec.gov)
Invesco Ltd250,533$8.4munder 0.1%Trimmed-39,03914 Aug 2026 (the filing on sec.gov)
Citadel Advisors LLC210,531$7.0munder 0.1%Trimmed-1,904,9602 Sep 2026 (the filing on sec.gov)
Man Group PLC195,110$6.5munder 0.1%Trimmed-18,24214 Aug 2026 (the filing on sec.gov)
Susquehanna International Group LLP180,871$6.0munder 0.1%Trimmed-343,92714 Aug 2026 (the filing on sec.gov)
Woodline Partners LP171,805$5.7munder 0.1%Held014 Aug 2026 (the filing on sec.gov)
Marshall Wace LLP159,889$5.3munder 0.1%Added+2,36313 Aug 2026 (the filing on sec.gov)
Moore Capital Management LP128,035$4.3m0.06%Trimmed-29,09714 Aug 2026 (the filing on sec.gov)
Brevan Howard Capital Management LP102,768$3.4munder 0.1%Trimmed-113,07714 Aug 2026 (the filing on sec.gov)
AllianceBernstein LP124,376$2.6munder 0.1%Added+96,35114 Aug 2026 (the filing on sec.gov)
Schonfeld Strategic Advisors LLC52,881$1.8munder 0.1%Trimmed-441,85614 Aug 2026 (the filing on sec.gov)
Janus Henderson Group Ltd36,543$1.2munder 0.1%Held014 Aug 2026 (the filing on sec.gov)
PDT Partners LLC15,405$514kunder 0.1%Held014 Aug 2026 (the filing on sec.gov)
Acadian Asset Management LLC3,144$104kunder 0.1%Trimmed-11,69313 Aug 2026 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q1 2026 to Q2 2026, among managers that listed it in both quarters or opened it.

Increases

Reductions

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (2)

Exited (4)

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.
16 in Q3 2024 to 7 in Q2 2026

Tracked managers listing it, at least.

051015202014201620182020202220242026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
RARE by quarter
QuarterHoldersReported valueBuyersSellers
Q1 20142$108mn.a.n.a.
Q2 20142$103mn.a.n.a.
Q3 20142$237mn.a.n.a.
Q4 20142$187mn.a.n.a.
Q1 20156$676mn.a.n.a.
Q2 20157$1.2bnn.a.n.a.
Q3 20159$1.3bnn.a.n.a.
Q4 20159$1.7bnn.a.n.a.
Q1 20163$933mn.a.n.a.
Q2 20164$461mn.a.n.a.
Q3 20166$1.1bnn.a.n.a.
Q4 20165$1.2bnn.a.n.a.
Q1 20175$1.1bnn.a.n.a.
Q2 20173$661mn.a.n.a.
Q3 20173$505mn.a.n.a.
Q4 20175$532mn.a.n.a.
Q1 20186$655mn.a.n.a.
Q2 20186$1.3bnn.a.n.a.
Q3 20186$1.3bnn.a.n.a.
Q4 20186$598mn.a.n.a.
Q1 20197$1.3bnn.a.n.a.
Q2 20197$1.3bnn.a.n.a.
Q3 20196$767mn.a.n.a.
Q4 20196$685mn.a.n.a.
Q1 20206$791mn.a.n.a.
Q2 20205$1.5bnn.a.n.a.
Q3 20206$1.6bnn.a.n.a.
Q4 20208$3.0bnn.a.n.a.
Q1 202110$2.6bnn.a.n.a.
Q2 202114$2.3bnn.a.n.a.
Q3 20219$2.0bnn.a.n.a.
Q4 20218$1.6bnn.a.n.a.
Q1 20228$1.5bnn.a.n.a.
Q2 20228$1.1bnn.a.n.a.
Q3 20226$487mn.a.n.a.
Q4 20228$604mn.a.n.a.
Q1 20239$502mn.a.n.a.
Q2 202311$619mn.a.n.a.
Q3 20238$397mn.a.n.a.
Q4 20239$593m72
Q1 202412$513m73
Q2 202413$413m102
Q3 202416$809m96
Q4 202411$243m74
Q1 20258$158m53
Q2 20257$120m43
Q3 20258$94m33
Q4 20255$43m1717
Q1 20265$48m1811
Q2 20267$396m1117

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

RARE and LLY →RARE and JNJ →RARE and VRTX →Choose a stock to compare with RARE →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own RARE, latest filings →Back to the 13F Explorer →