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

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

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 ACLX; Country of operation United States; Class COMMON STOCK; Shares before 169,859.
  • Q2 2026: Stock SLNO; Country of operation United States; Class COM; Shares before 257,253.
  • Q2 2026: Stock REGN; Country of operation United States; Class COM; Shares before 10,100.
  • Q2 2026: Stock APLS; Country of operation United States; Class COM; Shares before 162,750.

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 2026ACLX
ARCELLX INC
United StatesCOMMON STOCK169,8590-169,859$19,503,210$0-$19,503,2102026-08-14
Q2 2026SLNO
SOLENO THERAPEUTICS INC
United StatesCOM257,2530-257,253$8,612,830$0-$8,612,8302026-08-14
Q2 2026REGN
REGENERON PHARMACEUTICALS
United StatesCOM10,1000-10,100$7,803,664$0-$7,803,6642026-08-14
Q2 2026APLS
APELLIS PHARMACEUTICALS INC
United StatesCOM162,7500-162,750$6,547,433$0-$6,547,4332026-08-14
Q2 2026TERN
TERNS PHARMACEUTICALS INC
United StatesCOM113,7480-113,748$5,996,795$0-$5,996,7952026-08-14
Q2 2026EW
EDWARDS LIFESCIENCES CORP
United StatesCOM28,9000-28,900$2,314,312$0-$2,314,3122026-08-14
Q2 2026ACHC
ACADIA HEALTHCARE COMPANY IN
United StatesCOM75,5000-75,500$1,765,945$0-$1,765,9452026-08-14
Q2 2026JAZZ
JAZZ PHARMACEUTICALS PLC
SHS USD5,7500-5,750$1,087,038$0-$1,087,0382026-08-14
Q2 2026GOSS
GOSSAMER BIO INC
United StatesCOM1,609,4920-1,609,492$528,718$0-$528,7182026-08-14
Q2 2026FOLD
AMICUS THERAPEUTIC
United StatesCOM21,0620-21,062$304,557$0-$304,5572026-08-14

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