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Rock Springs Capital Management LP Historic Quarter Change: USA Stocks, New

Rock Springs Capital Management LP historic quarter change: USA Stocks, New

In share positions in stocks (listed in the US), over 21 quarters from 2013-12-31 to 2026-06-30, Rock Springs Capital Management LP opened 155 positions, added to 524, reduced 285 and sold out of 108.

  • Q2 2026: Stock ASND; Country of operation —; Class ORD SHS; Shares before 0.
  • Q2 2026: Stock AVLN; Country of operation United States; Class COM SHS; Shares before 0.
  • Q2 2026: Stock COAG; Country of operation United States; Class COM SHS; Shares before 0.
  • Q2 2026: Stock PBLS; Country of operation United States; Class COM; Shares before 0.

Each consecutive pair of Form 13F-HR filings compared (SEC CIK 1595725), 21 quarters: Q2 2026 (2026-03-31 to 2026-06-30, filed 2026-08-14); Q1 2026 (2025-12-31 to 2026-03-31, filed 2026-05-15); Q4 2025 (2025-09-30 to 2025-12-31, filed 2026-02-17); Q3 2025 (2025-06-30 to 2025-09-30, filed 2025-11-14); Q2 2025 (2025-03-31 to 2025-06-30, filed 2025-08-14); Q1 2025 (2024-12-31 to 2025-03-31, filed 2025-05-15); Q4 2024 (2024-09-30 to 2024-12-31, filed 2025-02-14); Q3 2024 (2024-06-30 to 2024-09-30, filed 2024-11-14); Q2 2024 (2024-03-31 to 2024-06-30, filed 2024-08-14); Q1 2024 (2023-12-31 to 2024-03-31, filed 2024-05-15); Q3 2016 (2016-06-30 to 2016-09-30, filed 2016-11-14); Q2 2016 (2016-03-31 to 2016-06-30, filed 2016-08-15); Q1 2016 (2015-12-31 to 2016-03-31, filed 2016-05-16); Q4 2015 (2015-09-30 to 2015-12-31, filed 2016-02-16); Q3 2015 (2015-06-30 to 2015-09-30, filed 2015-11-16); Q2 2015 (2015-03-31 to 2015-06-30, filed 2015-08-14); Q1 2015 (2014-12-31 to 2015-03-31, filed 2015-05-15); Q4 2014 (2014-09-30 to 2014-12-31, filed 2015-02-17); Q3 2014 (2014-06-30 to 2014-09-30, filed 2014-11-14); Q2 2014 (2014-03-31 to 2014-06-30, filed 2014-08-14); Q1 2014 (2013-12-31 to 2014-03-31, filed 2014-05-15). Rows for the same security, class and put/call are added together. Value change is the filed value at each quarter end, so it includes the price move. Only the filings held here are compared; the firm's 13F-HR filings go back to the quarter ended 2013-12-31. Not compared, as a quarter between them is not held here yet: 2016-09-30 to 2023-12-31 (missing 2016-12-31, 2017-03-31, 2017-06-30, 2017-09-30, 2017-12-31, 2018-03-31, 2018-06-30, 2018-09-30, 2018-12-31, 2019-03-31, 2019-06-30, 2019-09-30, 2019-12-31, 2020-03-31, 2020-06-30, 2020-09-30, 2020-12-31, 2021-03-31, 2021-06-30, 2021-09-30, 2021-12-31, 2022-03-31, 2022-06-30, 2022-09-30, 2022-12-31, 2023-03-31, 2023-06-30, 2023-09-30).

QuarterStockCountry of operationClassShares beforeShares afterShare changeValue beforeValue afterValue changeFiled
Q2 2026ASND
ASCENDIS PHARMA A/S
ORD SHS0168,750+168,750$0$45,009,000+$45,009,0002026-08-14
Q2 2026AVLN
AVALYN PHARMACEUTICALS INC
United StatesCOM SHS0662,918+662,918$0$21,823,261+$21,823,2612026-08-14
Q2 2026COAG
HEMAB THERAPEUTICS HLDGS INC
United StatesCOM SHS0575,432+575,432$0$21,135,617+$21,135,6172026-08-14
Q2 2026PBLS
PARABILIS MEDICINES INC
United StatesCOM0578,028+578,028$0$15,820,626+$15,820,6262026-08-14
Q2 2026OMER
OMEROS CORP
United StatesCOM0718,499+718,499$0$6,832,925+$6,832,9252026-08-14
Q2 2026DFTX
DEFINIUM THERAPEUTICS INC
United StatesCOM SHS0143,187+143,187$0$6,735,516+$6,735,5162026-08-14
Q2 2026MOBI
MOBIA MED INC
United StatesCOMMON STOCK0418,200+418,200$0$5,603,880+$5,603,8802026-08-14
Q2 2026TRVI
TREVI THERAPEUTICS INC
United StatesCOM0260,000+260,000$0$4,849,000+$4,849,0002026-08-14
Q2 2026SYRE
SPYRE THERAPEUTICS INC
United StatesCOM NEW042,254+42,254$0$3,751,310+$3,751,3102026-08-14
Q2 2026NGEN
NERVGEN PHARMA CORP
COM01,208,231+1,208,231$0$2,488,956+$2,488,9562026-08-14
Q2 2026MDT
MEDTRONIC PLC
IrelandSHS030,900+30,900$0$2,417,307+$2,417,3072026-08-14
Q2 2026SGMT
SAGIMET BIOSCIENCES INC
United StatesCOM SER A0250,000+250,000$0$1,932,500+$1,932,5002026-08-14
Q2 2026CAPR
CAPRICOR THERAPEUTICS INC
United StatesCOM NEW074,448+74,448$0$1,792,708+$1,792,7082026-08-14
Q2 2026ALT
ALTIMMUNE INC
United StatesCOM NEW0471,465+471,465$0$1,433,254+$1,433,2542026-08-14
Q2 2026KLRA
KAILERA THERAPEUTICS INC
United StatesCOMMON STOCK065,000+65,000$0$1,431,950+$1,431,9502026-08-14
Q2 2026AXSM
AXSOME THERAPEUTICS INC.
United StatesCOM05,500+5,500$0$1,346,235+$1,346,2352026-08-14
Q2 2026GKOS
GLAUKOS CORP
United StatesCOM04,750+4,750$0$663,860+$663,8602026-08-14

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