Palo Alto Investors LP

13F Filings History

Latest 13F report
Q2 2025 - Aug 14, 2025
Value $
$470M
Signature - Title
Angela Nguyen Dinh - Chief Compliance Officer
Location
Palo Alto, CA
Summary
This page shows a list of all the recent 13F filings made by Palo Alto Investors LP. Form 13F is required to be filed within 45 days of the end of a calendar quarter. Palo Alto Investors LP reported 45 stock holdings with total value $470M as of Q2 2025. Top holdings included INSM, ACAD, BMRN, FOLD, and UTHR.
Holdings Value
Quarter Holdings Value $ Bought Sold Net Top Holdings Form Type Date Filed
Q2 2025 45 $470M +$25.6M -$70.2M -$44.6M INSM, ACAD, BMRN, FOLD, UTHR 13F-HR 8/14/2025, 05:14 PM
Q1 2025 44 $525M +$25.3M -$112M -$87.2M INSM, BMRN, FOLD, ACAD, UTHR 13F-HR 5/15/2025, 04:39 PM
Q4 2024 43 $645M +$21.6M -$83.5M -$61.9M INSM, FOLD, BMRN, UTHR, ACAD 13F-HR 2/14/2025, 04:18 PM
Q3 2024 45 $770M +$71.7M -$110M -$37.9M INSM, FOLD, BMRN, UTHR, BIIB 13F-HR 11/14/2024, 04:11 PM
Q2 2024 39 $818M +$2.21M -$189M -$187M INSM, BMRN, FOLD, UTHR, BIIB 13F-HR 8/14/2024, 04:18 PM
Q1 2024 36 $879M +$35M -$131M -$96.5M INSM, FOLD, BMRN, BIIB, UTHR 13F-HR 5/15/2024, 04:10 PM
Q4 2023 33 $1.1B +$86.4M -$89.5M -$3.07M INSM, FOLD, BMRN, BIIB, UTHR Restatement 2/15/2024, 02:34 PM
Q3 2023 30 $1.06B +$10.7M -$21M -$10.2M BMRN, INSM, UTHR, FOLD, BIIB 13F-HR 11/14/2023, 04:41 PM
Q2 2023 32 $1.24B +$40.4M -$12.3M +$28.2M BMRN, UTHR, RVNC, FOLD, INSM 13F-HR 8/14/2023, 05:24 PM
Q1 2023 30 $1.21B +$18.8M -$9.87M +$8.89M BMRN, RVNC, UTHR, FOLD, BIIB 13F-HR 5/15/2023, 05:06 PM
Q4 2022 29 $1.17B +$59.8M -$29M +$30.7M BMRN, UTHR, FOLD, INSM, BIIB 13F-HR 2/14/2023, 03:39 PM
Q3 2022 32 $1.26B +$3.02M -$14.2M -$11.2M BMRN, UTHR, INSM, ABMD, RVNC 13F-HR 11/14/2022, 03:28 PM
Q2 2022 33 $1.15B +$22.7K -$24.7M -$24.7M BMRN, UTHR, ABMD, INSM, FOLD 13F-HR 8/15/2022, 05:31 PM
Q1 2022 35 $1.29B +$7.47M -$44.6M -$37.1M BMRN, ABMD, INSM, UTHR, FOLD 13F-HR 5/16/2022, 04:35 PM
Q4 2021 37 $1.56B +$54.4M -$42.4M +$11.9M BMRN, ABMD, INSM, UTHR, FOLD 13F-HR 2/14/2022, 03:28 PM
Q3 2021 42 $1.66B +$28.5M -$48.2M -$19.7M ABMD, BMRN, INSM, STAA, UTHR 13F-HR 11/15/2021, 04:19 PM
Q2 2021 42 $1.81B +$25.7M -$110M -$83.9M STAA, BMRN, ABMD, INSM, BIIB 13F-HR 8/16/2021, 04:36 PM
Q1 2021 42 $1.76B +$144M -$192M -$47.4M INSM, STAA, ABMD, BMRN, UTHR 13F-HR 5/17/2021, 04:37 PM
Q4 2020 41 $1.91B +$224M -$651K +$223M STAA, INSM, BMRN, FOLD, ABMD 13F-HR 2/16/2021, 03:33 PM
Q3 2020 42 $1.82B +$140M -$152M -$11.2M IMMU, INSM, STAA, ABMD, BMRN 13F-HR 11/16/2020, 03:23 PM
Q2 2020 41 $1.67B +$40.7M -$103M -$62.4M IMMU, STAA, BMRN, INSM, ABMD 13F-HR 8/14/2020, 04:15 PM
Q1 2020 37 $1.19B +$10.4M -$263M -$252M BMRN, STAA, INSM, EPZM, UTHR 13F-HR 5/15/2020, 04:09 PM
Q4 2019 37 $1.82B +$8.66M -$129M -$120M BMRN, INSM, EPZM, STAA, IMMU Restatement 4/8/2020, 04:35 PM
Q3 2019 37 $1.5B -$161M -$161M BMRN, INSM, ABMD, UTHR, STAA 13F-HR 11/14/2019, 03:14 PM
Q2 2019 38 $2.06B +$22.7M -$71.8M -$49.1M BMRN, INSM, ABMD, SAGE, ALXN 13F-HR 8/14/2019, 04:17 PM
Q1 2019 37 $2.4B +$138M -$25.1M +$113M BMRN, INSM, ABMD, UTHR, ALXN Restatement 7/30/2019, 12:25 PM
Q4 2018 36 $1.88B +$78.5M -$31.5M +$47M ABMD, BMRN, UTHR, STAA, ALXN 13F-HR 2/14/2019, 03:25 PM
Q3 2018 36 $2.47B +$25M -$96M -$71M ABMD, BMRN, UTHR, STAA, ALXN 13F-HR 11/14/2018, 03:29 PM
Q2 2018 36 $2.5B +$77.1M -$198M -$121M ABMD, BMRN, CLVSQ, UTHR, INSM 13F-HR 8/14/2018, 04:28 PM
Q1 2018 36 $2.34B +$84.4M -$72.5M +$11.8M ABMD, CLVSQ, BMRN, UTHR, INSM 13F-HR 5/15/2018, 04:28 PM
Q4 2017 37 $2.32B +$89.5M -$124M -$34.1M ABMD, UTHR, CLVSQ, BMRN, INSM 13F-HR 2/14/2018, 04:00 PM
Q3 2017 39 $2.37B +$60.1M -$53.5M +$6.61M ABMD, CLVSQ, BMRN, UTHR, INSM 13F-HR 11/14/2017, 03:40 PM
Q2 2017 38 $2.14B +$54.8M -$61.6M -$6.78M CLVSQ, ABMD, UTHR, BMRN, ALXN 13F-HR 8/14/2017, 04:41 PM
Q1 2017 39 $2.12B +$207M +$207M UTHR, CLVSQ, ABMD, BMRN, ALXN 13F-HR 5/15/2017, 04:33 PM
Q4 2016 38 $1.75B +$95.5M -$12.6M +$82.8M UTHR, ABMD, CLVSQ, BMRN, AMAG 13F-HR 2/14/2017, 04:36 PM
Q3 2016 42 $1.72B +$99.5M -$27.4M +$72.1M ABMD, UTHR, BMRN, CLVSQ, AMAG 13F-HR 11/14/2016, 03:49 PM
Q2 2016 45 $1.32B +$227M -$43.5M +$184M ABMD, UTHR, BMRN, AMAG, CLVSQ Restatement 8/15/2016, 05:46 PM
Q1 2016 44 $1.29B +$21.6M -$55.5M -$34M ABMD, UTHR, ANAC, BMRN, AMAG 13F-HR 5/16/2016, 05:15 PM
Q4 2015 43 $1.8B +$138M -$82.5M +$55.1M ABMD, ANAC, UTHR, BMRN, CLVSQ 13F-HR 2/16/2016, 04:00 PM
Q3 2015 47 $2.08B +$185M -$227M -$42.1M ANAC, CLVSQ, ABMD, UTHR, BMRN 13F-HR 11/16/2015, 03:28 PM
Q2 2015 45 $2.25B +$80.5M -$35M +$45.5M UTHR, ANAC, BMRN, CLVSQ, ABMD 13F-HR 8/14/2015, 04:36 PM
Q1 2015 45 $2.02B +$372M -$95.5M +$277M UTHR, BMRN, ANAC, ABMD, CLVSQ 13F-HR 5/15/2015, 05:11 PM
Q4 2014 46 $1.7B +$177M -$85.8M +$91.1M UTHR, AUXL, CBST, CLVSQ, BMRN 13F-HR 2/17/2015, 04:18 PM
Q3 2014 43 $1.34B +$235M -$21.3M +$214M UTHR, AUXL, CBST, BMRN, CYBX 13F-HR 11/13/2014, 01:40 PM
Q2 2014 42 $1.34B +$203M -$79.3M +$124M ITMN, UTHR, CYBX, CBST, AUXL 13F-HR 8/13/2014, 07:45 PM
Q1 2014 39 $1.21B ITMN, AUXL, CYBX, UTHR, CBST New Holdings 5/15/2014, 06:36 PM
Q1 2014 39 $1.21B +$60.9M -$45.7M +$15.2M ITMN, AUXL, CYBX, UTHR, CBST 13F-HR 5/15/2014, 04:46 PM
Q4 2013 34 $1.07B CYBX, UTHR, AUXL, CBST, ABMD 13F-HR 2/13/2014, 04:04 PM