Follow-The-Filings

Featured 13F manager

Palo Alto Investors LP Palo Alto Investors

Palo Alto, CA 23 processed 13Fs on this site · 2021 Q3–2026 Q2

  • $724M
  • 52 Positions
  • 2026 Q2
  • +10.7% QoQ
  • Top 5 37.7%

Palo Alto Investors files Palo Alto Investors LP as a Form 13F. The latest book is 2026 Q2 at $724M, up 10.7% QoQ, led by Ptc Therapeutics, Acadia Pharmaceuticals, and Insmed.

Portfolio

2026 Q2 · filed 8/19/2026 · 52 long · top 12 shown

top 5 37.7% · top 10 61.3%

AUM over time

2026 Q2 $724M +10.7% QoQ
2021 Q3 · $1.7B 2021 Q3 · $1.7B
Q3 2021
2021 Q4 · $1.6B · −5.6% QoQ 2021 Q4 · $1.6B · −5.6% QoQ
Q4
2022 Q1 · $1.3B · −17.4% QoQ 2022 Q1 · $1.3B · −17.4% QoQ
Q1 2022
2022 Q2 · $1.1B · −11.3% QoQ 2022 Q2 · $1.1B · −11.3% QoQ
Q2
2022 Q3 · $1.3B · +10.3% QoQ 2022 Q3 · $1.3B · +10.3% QoQ
Q3
2022 Q4 · $1.2B · −7.3% QoQ 2022 Q4 · $1.2B · −7.3% QoQ
Q4
2023 Q1 · $1.2B · +2.9% QoQ 2023 Q1 · $1.2B · +2.9% QoQ
Q1 2023
2023 Q2 · $1.2B · +2.6% QoQ 2023 Q2 · $1.2B · +2.6% QoQ
Q2
2023 Q3 · $1.1B · −14.6% QoQ 2023 Q3 · $1.1B · −14.6% QoQ
Q3
2023 Q4 · $1.1B · +4.7% QoQ 2023 Q4 · $1.1B · +4.7% QoQ
Q4
2024 Q1 · $887M · −19.9% QoQ 2024 Q1 · $887M · −19.9% QoQ
Q1 2024
2024 Q2 · $863M · −2.7% QoQ 2024 Q2 · $863M · −2.7% QoQ
Q2
2024 Q3 · $770M · −10.8% QoQ 2024 Q3 · $770M · −10.8% QoQ
Q3
2024 Q4 · $645M · −16.2% QoQ 2024 Q4 · $645M · −16.2% QoQ
Q4
2025 Q1 · $525M · −18.6% QoQ 2025 Q1 · $525M · −18.6% QoQ
Q1 2025
2025 Q2 · $470M · −10.5% QoQ 2025 Q2 · $470M · −10.5% QoQ
Q2
2025 Q3 · $540M · +14.9% QoQ 2025 Q3 · $540M · +14.9% QoQ
Q3
2025 Q4 · $718M · +33.0% QoQ 2025 Q4 · $718M · +33.0% QoQ
Q4
2026 Q1 · $654M · −8.9% QoQ 2026 Q1 · $654M · −8.9% QoQ
Q1 2026
2026 Q2 · $724M · +10.7% QoQ 2026 Q2 · $724M · +10.7% QoQ
Q2

Book

2023 Q1 2022 Q4 · filed 15 May · long equity

BMRN - Biomarin Pharmaceutical 14.75% Reduce −2.9% 1,831,035 $97.24 $178M −54,776 −$17M
Revance Therapeutics 14.06% Reduce −0.3% 5,270,209 $32.21 $170M −13,400 +$72M
UTHR - United Therapeutics 11.64% Add +0.3% 627,514 $223.96 $141M +2,100 −$33M
FOLD - Amicus 9.67% Add +0.3% 10,524,022 $11.09 $117M +30,300 −$11M
BIIB - Biogen 8.78% Add +0.3% 381,282 $278.03 $106M +1,200 +$756K
INSM - Insmed 8.32% Add +0.3% 5,889,491 $17.05 $100M +18,200 −$17M
Staar Surgical 7.14% Add +8.6% 1,347,322 $63.95 $86M +107,245 +$26M
PRTA - Prothena 6.68% Add +0.3% 1,663,777 $48.47 $81M +5,200 −$19M
ACAD - Acadia Pharmaceuticals 3.75% Add +1.2% 2,405,793 $18.82 $45M +29,424 +$7M
Sage Therapeutics 2.99% Add +0.4% 859,517 $41.96 $36M +3,000 +$3M
EHTH - Ehealth 2.09% Add +8.2% 2,689,379 $9.36 $25M +204,900 +$13M
ALGN - Align Technology 2.07% Hold 74,605 $334.14 $25M
Karyopharm Therapeutics 1.83% Add +0.4% 5,675,876 $3.89 $22M +20,200 +$3M
ALKS - Alkermes 1.41% Hold 603,400 $28.19 $17M
SNDX - Syndax Pharmaceuticals 1.07% Hold 612,600 $21.12 $13M
Provention Bio 0.78% Hold 390,800 $24.10 $9M
ANAB - Anaptysbio 0.78% Add 0.0% 431,224 $21.76 $9M +200 −$4M
Gossamer Bio 0.36% Add +9079.2% 3,465,152 $1.26 $4M +3,427,402 +$4M
CYTK - Cytokinetics 0.33% Hold 111,717 $35.19 $4M
TVTX - Travere Therapeutics 0.31% Hold 166,069 $22.49 $4M
VNDA - Vanda Pharmaceuticals 0.27% Reduce −55.6% 482,697 $6.79 $3M −604,910 −$5M
Kezar Life Sciences 0.17% Hold 656,200 $3.13 $2M
NVCR - Novocure 0.16% New 32,790 $60.14 $2M +32,790 +$2M
Gritstone Oncology 0.15% Hold 666,127 $2.78 $2M
ALDX - Aldeyra Therapeutics 0.13% Hold 160,800 $9.93 $2M
MIRM - Mirum Pharmaceuticals 0.13% Hold 64,700 $24.02 $2M
RLMD - Relmada Therapeutics 0.10% New 542,100 $2.26 $1M +542,100 +$1M
Holding 0.04% Hold 27,100 $16.42 $445K
Peak Bio 0.03% Hold 497,528 $0.6314 $314K
URGN - Urogen Pharma 0.02% Hold 24,500 $9.24 $226K

Exits / last held

not current holdings · last reported size, unchanged · gone vs 2022 Q4

Stock % of portfolio Recent activity Shares Reported price* Value Share change $ change
Alimera Sciences 0.05% Exit 0 $2.71 $544K −200,919 −$544K

* Reported price is value ÷ shares from the 13F as of period end — not a live market quote. Weight % is each long-equity position ÷ full 13F AUM, so rows may not sum to 100% when the filing includes options or other non-equity (excluded from this table). Share change and $ change are vs 2022 Q4. Click column headers to sort · click New / Hold / Add / Reduce to promote that move type to the top. Exit opens the last-held block below.

Filings history

20 periods · normalized AUM · open a period for holdings

Period Holdings AUM QoQ Form Filed Filing ID
2026 Q2 52 $724M +10.7% RESTATEMENT 8/19/2026 000207367926000102
2026 Q2 52 $724M RESTATEMENT 8/18/2026 000207367926000101
2026 Q2 52 $724M 13F-HR 8/17/2026 000207367926000096
2026 Q1 51 $654M −8.9% 13F-HR 5/15/2026 000130692326000004
2025 Q4 49 $718M +33.0% 13F-HR 2/17/2026 000130692326000002
2025 Q3 44 $540M +14.9% 13F-HR 11/14/2025 000130692325000019
2025 Q2 45 $470M −10.5% 13F-HR 8/14/2025 000130692325000016
2025 Q1 44 $525M −18.6% 13F-HR 5/15/2025 000130692325000014
2024 Q4 43 $645M −16.2% 13F-HR 2/14/2025 000130692325000010
2024 Q3 45 $770M −10.8% 13F-HR 11/14/2024 000130692324000012
2024 Q2 39 $863M −2.7% 13F-HR 8/14/2024 000130692324000010
2024 Q1 38 $887M −19.9% 13F-HR 5/15/2024 000130692324000008
2023 Q4 34 $1.1B RESTATEMENT 2/15/2024 000130692324000007
2023 Q4 34 $1.1B +4.7% 13F-HR 2/14/2024 000130692324000002
2023 Q3 29 $1.1B −14.6% 13F-HR 11/14/2023 000130692323000014
2023 Q2 30 $1.2B +2.6% 13F-HR 8/14/2023 000130692323000012
2023 Q1 30 $1.2B +2.9% 13F-HR 5/15/2023 000130692323000011
2022 Q4 29 $1.2B −7.3% 13F-HR 2/14/2023 000130692323000009
2022 Q3 32 $1.3B +10.3% 13F-HR 11/14/2022 000130692322000016
2022 Q2 33 $1.1B −11.3% 13F-HR 8/15/2022 000130692322000015
2022 Q1 35 $1.3B −17.4% 13F-HR 5/16/2022 000130692322000014
2021 Q4 37 $1.6B −5.6% 13F-HR 2/14/2022 000130692322000004
2021 Q3 42 $1.7B 13F-HR 11/15/2021 000130692321000026

About

Palo Alto Investors LP

23 processed 13Fs on this site · 2021 Q3–2026 Q2

Entity
Palo Alto Investors LP
Notable person
Palo Alto Investors
Location
Palo Alto, CA
All SEC filings
View on sec.gov