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RTW Investments’s Ultragenyx Pharmaceutical RARE Stock Holding History

RTW Investments’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
Q2 		$260M Buy
7,796,895
+4,148,100
+114% +$103M 2.22% 14
2026
Q1 		$76.4M Buy
3,648,795
+648,656
+22% +$14.6M 0.76% 36
2025
Q4 		$69M Sell
3,000,139
-258,127
-8% -$8.49M 0.69% 40
2025
Q3 		$98M Buy
3,258,266
+1,550,864
+91% +$46.5M 1.21% 24
2025
Q2 		$62.1M Hold
1,707,402
– – 0.88% 30
2025
Q1 		$61.8M Sell
1,707,402
-260,600
-13% -$10.8M 0.95% 27
2024
Q4 		$82.8M Hold
1,968,002
– – 1.25% 27
2024
Q3 		$109M Sell
1,968,002
-1,291,925
-40% -$65.8M 1.58% 27
2024
Q2 		$134M Sell
3,259,927
-3,827,188
-54% -$163M 2.07% 18
2024
Q1 		$331M Buy
7,087,115
+200,029
+3% +$9.44M 4.88% 4
2023
Q4 		$329M Buy
6,887,086
+1,481,997
+27% +$57.5M 5.14% 6
2023
Q3 		$193M Hold
5,405,089
– – 4.07% 9
2023
Q2 		$249M Buy
5,405,089
+1,134,093
+27% +$52.6M 4.75% 6
2023
Q1 		$171M Buy
4,270,996
+304,081
+8% +$13M 3.57% 10
2022
Q4 		$184M Buy
3,966,915
+1,606,919
+68% +$63.2M 3.75% 9
2022
Q3 		$97.7M Buy
2,359,996
+986,712
+72% +$50.7M 2.25% 15
2022
Q2 		$81.9M Hold
1,373,284
– – 2.12% 16
2022
Q1 		$99.7M Hold
1,373,284
– – 2.06% 20
2021
Q4 		$115M Buy
+1,373,284
New +$112M 1.69% 18

Other funds holding RARE

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
AQR Capital Management
AQR Capital Management Greenwich, Connecticut $287B AUM 42.33% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Two Sigma Investments
Two Sigma Investments New York $138B AUM 41.87% 1-Year Est. Return
Sands Capital Management
Sands Capital Management Arlington, Virginia $26.9B AUM 34.44% 1-Year Est. Return
Jacobs Levy Equity Management
Jacobs Levy Equity Management Florham Park, New Jersey $27.8B AUM 46.46% 1-Year Est. Return
FCM
Frontier Capital Management Boston, Massachusetts $10.7B AUM 67.78% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

RTW Investments's RARE Position: Q2 2026 in Review

RTW Investments increased its Ultragenyx Pharmaceutical (RARE) stake by 114% in Q2 2026, buying an estimated $103M and bringing the position to 7,796,895 shares worth $260M. The position accounts for 2.22% of the portfolio, ranked #14.

RTW Investments first reported a position in RARE in Q4 2021 and has held it in 19 quarters since. The position peaked at $331M in Q1 2024. 310 funds tracked by Wall St. Rank hold RARE as of Q2 2026.

  • RTW Investments held 7,796,895 shares of Ultragenyx Pharmaceutical worth $260M as of Q2 2026.
  • RTW Investments bought 4,148,100 Ultragenyx Pharmaceutical shares in Q2 2026, an estimated $103M.
  • Ultragenyx Pharmaceutical made up 2.22% of RTW Investments's portfolio in Q2 2026, its #14 holding.
  • RTW Investments first reported a position in Ultragenyx Pharmaceutical in Q4 2021 and has held it in 19 quarters since.
  • RTW Investments's Ultragenyx Pharmaceutical position peaked at $331M in Q1 2024.
  • 310 funds tracked by Wall St. Rank held Ultragenyx Pharmaceutical as of Q2 2026.

Based on RTW Investments's 13F filing for Q2 2026, filed 14 Aug 2026.