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 		$1.61M Sell
76,900
-6,000
-7% -$135K ﹤0.01% 5492
2025
Q4 		$1.91M Sell
82,900
-27,900
-25% -$917K ﹤0.01% 4903
2025
Q3 		$3.33M Sell
110,800
-224,800
-67% -$6.74M ﹤0.01% 4048
2025
Q2 		$12.2M Buy
335,600
+158,400
+89% +$5.71M ﹤0.01% 1922
2025
Q1 		$6.42M Buy
177,200
+66,400
+60% +$2.76M ﹤0.01% 2559
2024
Q4 		$4.66M Sell
110,800
-7,100
-6% -$352K ﹤0.01% 2761
2024
Q3 		$6.55M Buy
117,900
+10,600
+10% +$540K ﹤0.01% 2436
2024
Q2 		$4.41M Buy
107,300
+27,700
+35% +$1.18M ﹤0.01% 3162
2024
Q1 		$3.72M Sell
79,600
-20,500
-20% -$967K ﹤0.01% 3067
2023
Q4 		$4.79M Buy
100,100
+73,700
+279% +$2.86M ﹤0.01% 2918
2023
Q3 		$941K Buy
26,400
+6,600
+33% +$261K ﹤0.01% 5266
2023
Q2 		$913K Sell
19,800
-40,200
-67% -$1.86M ﹤0.01% 5342
2023
Q1 		$2.41M Sell
60,000
-31,400
-34% -$1.35M ﹤0.01% 3501
2022
Q4 		$4.23M Buy
91,400
+34,400
+60% +$1.35M ﹤0.01% 2708
2022
Q3 		$2.36M Buy
57,000
+42,700
+299% +$2.19M ﹤0.01% 3902
2022
Q2 		$853K Sell
14,300
-4,900
-26% -$302K ﹤0.01% 5774
2022
Q1 		$1.39M Sell
19,200
-28,800
-60% -$2M ﹤0.01% 5436
2021
Q4 		$4.04M Buy
48,000
+4,300
+10% +$350K ﹤0.01% 3185
2021
Q3 		$3.94M Buy
43,700
+24,800
+131% +$2.24M ﹤0.01% 3138
2021
Q2 		$1.8M Buy
+18,900
New +$1.97M ﹤0.01% 4521
2020
Q3 		– Sell
-5,200
Closed -$407K – 7781
2020
Q2 		$407K Buy
+5,200
New +$344K ﹤0.01% 5383

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.