Jane Street
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Jane Street’s Ultragenyx Pharmaceutical RARE Stock Holding History

Jane Street’s Portfolio RARE Stock Details RARE Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$2.6M Buy
124,100
+46,600
+60% +$1.05M ﹤0.01% 4605
2025
Q4 		$1.78M Sell
77,500
-50,400
-39% -$1.66M ﹤0.01% 5027
2025
Q3 		$3.85M Buy
127,900
+10,500
+9% +$315K ﹤0.01% 3818
2025
Q2 		$4.27M Buy
117,400
+24,600
+27% +$887K ﹤0.01% 3223
2025
Q1 		$3.36M Buy
92,800
+73,700
+386% +$3.07M ﹤0.01% 3550
2024
Q4 		$804K Sell
19,100
-7,500
-28% -$372K ﹤0.01% 5794
2024
Q3 		$1.48M Sell
26,600
-11,100
-29% -$565K ﹤0.01% 5078
2024
Q2 		$1.55M Sell
37,700
-13,000
-26% -$555K ﹤0.01% 4950
2024
Q1 		$2.37M Sell
50,700
-87,900
-63% -$4.15M ﹤0.01% 3826
2023
Q4 		$6.63M Buy
138,600
+122,800
+777% +$4.76M ﹤0.01% 2463
2023
Q3 		$563K Sell
15,800
-11,400
-42% -$452K ﹤0.01% 6098
2023
Q2 		$1.25M Sell
27,200
-6,800
-20% -$315K ﹤0.01% 4854
2023
Q1 		$1.36M Sell
34,000
-48,600
-59% -$2.09M ﹤0.01% 4459
2022
Q4 		$3.83M Buy
82,600
+51,800
+168% +$2.04M ﹤0.01% 2853
2022
Q3 		$1.27M Buy
30,800
+24,700
+405% +$1.27M ﹤0.01% 4979
2022
Q2 		$364K Sell
6,100
-14,100
-70% -$868K ﹤0.01% 7279
2022
Q1 		$1.47M Buy
+20,200
New +$1.41M ﹤0.01% 5346
2021
Q4 		– Sell
-16,500
Closed -$1.49M – 10686
2021
Q3 		$1.49M Buy
+16,500
New +$1.49M ﹤0.01% 5086
2021
Q2 		– Sell
-15,100
Closed -$1.72M – 10293
2021
Q1 		$1.72M Sell
15,100
-4,200
-22% -$572K ﹤0.01% 4319
2020
Q4 		$2.67M Sell
19,300
-900
-4% -$107K ﹤0.01% 2991
2020
Q3 		$1.66M Buy
20,200
+7,900
+64% +$655K ﹤0.01% 3319
2020
Q2 		$962K Buy
+12,300
New +$814K ﹤0.01% 4115
2016
Q4 		– Sell
-8,000
Closed -$568K – 4510
2016
Q3 		$568K Buy
+8,000
New +$511K ﹤0.01% 2635

Other funds holding RARE

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
AQR Capital Management
AQR Capital Management Greenwich, Connecticut $218B AUM 29.41% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
RI
RTW Investments New York $10B AUM 135.35% 1-Year Est. Return
Sands Capital Management
Sands Capital Management Arlington, Virginia $25.5B AUM 26.46% 1-Year Est. Return
SI
Sofinnova Investments Menlo Park, California $2.63B AUM 117.41% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
BG
Bellevue Group Kuesnacht, Switzerland $4.2B AUM 54.85% 1-Year Est. Return

Jane Street's RARE Position: Q1 2026 in Review

Jane Street reduced its Ultragenyx Pharmaceutical (RARE) stake by 83% in Q1 2026, selling an estimated $19.1M and leaving 173,743 shares worth $3.64M. The position accounts for ﹤0.01% of the portfolio, ranked #4004.

Jane Street first reported a position in RARE in Q2 2015 and has held it in 33 quarters since. The position peaked at $23.5M in Q4 2025. 296 funds tracked by Wall St. Rank hold RARE as of Q1 2026.

  • Jane Street held 173,743 shares of Ultragenyx Pharmaceutical worth $3.64M as of Q1 2026.
  • Jane Street sold 847,756 Ultragenyx Pharmaceutical shares in Q1 2026, an estimated $19.1M.
  • Ultragenyx Pharmaceutical made up ﹤0.01% of Jane Street's portfolio in Q1 2026, its #4004 holding.
  • Jane Street first reported a position in Ultragenyx Pharmaceutical in Q2 2015 and has held it in 33 quarters since.
  • Jane Street's Ultragenyx Pharmaceutical position peaked at $23.5M in Q4 2025.
  • 296 funds tracked by Wall St. Rank held Ultragenyx Pharmaceutical as of Q1 2026.

Based on Jane Street's 13F filing for Q1 2026, filed 12 May 2026.