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Logos Global Management LP — 13F Holdings & Portfolio

CIK 1792126 · latest 13F-HR filed 2026-08-14

Backtest portfolio

Logos Global Management LP manages $2.32B in 13F-reported U.S. long-equity assets across 68 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are ERAS (9.58%), ABVX (5.87%), RVMD (5.64%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 25 new positions and exited 20; 23 existing positions rose in reported value and 17 fell.

AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.

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AUM
$2.32B

Long-equity book

Holdings
68

Distinct positions

Period
2026-06-30

Filed 2026-08-14

Q/Q Activity
+25 / −20 / ↑23 / ↓17

vs 2026-03-31

Portfolio charts

Latest quarter's book, what changed, and how the portfolio has evolved across filings.

Portfolio map

Q2 26
ERAS9.6% · +9%ABVX5.9% · +52%RVMD5.6% · -65%IDYA4.8% · -13%BNTX4.1% · newVERA4.1% · newTNGX3.8% · -5%PRAX3.7% · -9%CLDX3.4% · +367%DNTH3.4% · +100%CGON3.1% · +74%IRON2.8% · +56%MAZE2.5% · +57%DYN2.4% · +82%MLTX2.2% · +78%OCUL2.2% · +38%DSGN1.9% · +54%OLMA1.7% · 0%BLTE1.7% · newACHV1.5% · newTRVI1.5% · -22%COGT1.5% · newAVBP1.5% · +186%CBIO1.5% · +294%CMPS1.4% · newMLYS1.2% · newREPL1.2% · newXENE1.2% · 0%GPCR1.2% · 0%IMVT1.1% · -38%JBIO1.1% · +181%ELVN1.0% · -14%MANE1.0% · +620%AVTX0.9% · +283%RCUS0.9% · -46%SMMT0.8% · newIMCR0.8% · -60%LBRX0.8% · -36%NERV0.8% · +2%FTH0.8% · newCRSP0.7% · newDBVT0.6% · newPBLS0.6% · newRYTM0.6% · -72%VOR0.5% · -13%SRRK0.5% · newIMMX0.4% · -18%QTTB0.4% · newODTX0.4% · newANNX0.4% · newEDIT0.3% · newRLAY0.3% · -53%ACAD0.3% · -67%AMLX0.3% · -50%HELP0.2% · newOKUR0.2% · newTENX0.2% · -52%DFTX0.2% · newUNCY0.1% · 0%PTN0.1% · -7%

Box size = position value; colour = change in share count vs the prior quarter (green added, red trimmed, blue new). Rows split across managers or share classes are combined. Click a box for the stock.

Sector mix

% of 13F value

Sectors from each company's SIC code; funds and ETFs grouped separately.

Biggest buys and sells

Q1 26 → Q2 26

Estimated from the change in shares held × the quarter-end price, so price moves alone don't count as buying. New and exited positions are included.

13F assets and positions

4 quarters

Total reported 13F value (bars) and number of positions (line) each quarter. Value changes include market moves.

Top positions over time

reported value

The eight largest current positions, valued at each quarter end.

Concentration

top 10 = 48.3%

Cumulative share of the portfolio held in the largest N positions.

Firm Profile & Key People

As of the firm’s regulatory filing dated Apr 22, 2026.

Assets Under Management
$2.25B
Discretionary
$2.25B
Employees
9
Accounts
8
Address
1 LETTERMAN DRIVE
BLDG C, STE C3-350
SAN FRANCISCO, CA 94129
Phone
(415) 801-4660
Website
Name Title / Status Ownership Type
AHW HOLDINGS TRUST ControlLIMITED PARTNER
since Jan 2026
75% or moreDomestic Entity
GOLDSMITH, CYNTHIA, LOUISE ControlCHIEF FINANCIAL OFFICER
since May 2023
Less than 5%Individual
LOGOS GLOBAL MANAGEMENT GP LLC ControlGENERAL PARTNER
since Mar 2019
Less than 5%Domestic Entity
WALMSLEY, GRAHAM, GORDON ControlMANAGING PARTNER / LIMITED PARTNER
since Jun 2019
10–25%Individual
WILLIAM, ARSANI, HANY ControlMANAGING PARTNER / CHIEF INVESTMENT OFFICER
since Jun 2019
75% or moreIndividual
GOULD, DEREK, ALANCHIEF COMPLIANCE OFFICER & GENERAL COUNSEL
since May 2023
Less than 5%Individual
WILLIAM, ARSANI, HANY Control
Indirect owner via LOGOS GLOBAL MANAGEMENT GP LLC
MANAGING MEMBER
since Jun 2019
75% or moreIndividual
WILLIAM, ARSANI, HANY Control
Indirect owner via AHW HOLDINGS TRUST
TRUSTEE
since Jan 2026
75% or moreIndividual
Ownership & leadership changes · 5 filings with changes since Jul 26, 2019

From the firm’s regulatory filings, newest first. Dates are filing dates: a filing that no longer lists someone does not say when they left.

Apr 22, 2026 filing
  • AddedAHW HOLDINGS TRUST · LIMITED PARTNER · 75% or more · control person
  • AddedWILLIAM, ARSANI, HANY · TRUSTEE · 75% or more · indirect via AHW HOLDINGS TRUST · control person
  • ChangedWILLIAM, ARSANI, HANY · title MANAGING PARTNER / LIMITED PARTNER → MANAGING PARTNER / CHIEF INVESTMENT OFFICER
Mar 31, 2026 filing
  • No longer listedZHONG, EDWARD, YI · PARTNER / LIMITED PARTNER · 5–10% · control person · listed since Jun 2019
Mar 29, 2024 filing
  • No longer listedYEE, VIRGINIA, (NMN) · CHIEF FINANCIAL OFFICER · Less than 5% · control person · listed since Jun 2019
  • AddedGOLDSMITH, CYNTHIA, LOUISE · CHIEF FINANCIAL OFFICER · Less than 5% · control person
  • ChangedWALMSLEY, GRAHAM, GORDON · title MANAGING MEMBER / LIMITED PARTNER → MANAGING PARTNER / LIMITED PARTNER
  • ChangedWILLIAM, ARSANI, HANY · ownership 50–75% → 75% or more
  • ChangedWILLIAM, ARSANI, HANY · indirect via LOGOS GLOBAL MANAGEMENT GP LLC: ownership 50–75% → 75% or more
  • ChangedZHONG, EDWARD, YI · title MANAGING MEMBER / LIMITED PARTNER → PARTNER / LIMITED PARTNER
May 31, 2023 filing
  • AddedGOULD, DEREK, ALAN · CHIEF COMPLIANCE OFFICER & GENERAL COUNSEL · Less than 5%
  • ChangedYEE, VIRGINIA, (NMN) · title CHIEF FINANCIAL OFFICER / CHIEF COMPLIANCE OFFICER → CHIEF FINANCIAL OFFICER
Mar 31, 2023 filing
  • No longer listedCALLAWAY, EDWARD, CASON · CHIEF OPERATIONS OFFICER / LIMITED PARTNER · 5–10% · control person · listed since Jun 2019
  • No longer listedSOUROUTZIDIS, IOANNIS, LINN · MANAGING MEMBER / LIMITED PARTNER · 5–10% · control person · listed since Jun 2019
Jul 26, 2019 filing (earliest on record)
  • ListedCALLAWAY, EDWARD, CASON · CHIEF OPERATIONS OFFICER / LIMITED PARTNER · 5–10% · control person
  • ListedLOGOS GLOBAL MANAGEMENT GP LLC · GENERAL PARTNER · Less than 5% · control person
  • ListedSOUROUTZIDIS, IOANNIS, LINN · MANAGING MEMBER / LIMITED PARTNER · 5–10% · control person
  • ListedWALMSLEY, GRAHAM, GORDON · MANAGING MEMBER / LIMITED PARTNER · 10–25% · control person
  • ListedWILLIAM, ARSANI, HANY · MANAGING PARTNER / LIMITED PARTNER · 50–75% · control person
  • ListedWILLIAM, ARSANI, HANY · MANAGING MEMBER · 50–75% · indirect via LOGOS GLOBAL MANAGEMENT GP LLC · control person
  • ListedYEE, VIRGINIA, (NMN) · CHIEF FINANCIAL OFFICER / CHIEF COMPLIANCE OFFICER · Less than 5% · control person
  • ListedZHONG, EDWARD, YI · MANAGING MEMBER / LIMITED PARTNER · 5–10% · control person

Quarter-over-quarter changes

Changes in reported position value vs the prior 13F, so price moves count too, not just shares bought or sold.

Logos Global Management LP Holdings (2026-06-30)

Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).

# Issuer Symbol CUSIP Value Weight Shares Type
1 ERASCA INC ERAS 29479A108 $222.6M 9.58% 12,150,000 SH
2 ABIVAX SA ABVX 00370M103 $136.5M 5.87% 1,024,000 SH
3 REVOLUTION MEDICINES INC RVMD 76155X100 $131.1M 5.64% 700,000 SH
4 IDEAYA BIOSCIENCES INC IDYA 45166A102 $111.8M 4.81% 3,000,000 SH
5 BIONTECH SE BNTX 09075V102 $94.4M 4.07% 1,015,000 SH
6 VERA THERAPEUTICS INC VERA 92337R101 $94.4M 4.06% 2,200,000 SH
7 TANGO THERAPEUTICS INC TNGX 87583X109 $89.1M 3.84% 2,850,000 SH
8 PRAXIS PRECISION MEDICINES I PRAX 74006W207 $87.0M 3.75% 260,000 SH
9 CELLDEX THERAPEUTICS INC NEW CLDX 15117B202 $78.1M 3.36% 2,100,000 SH
10 DIANTHUS THERAPEUTICS INC DNTH 252828108 $78.0M 3.36% 800,000 SH
11 CG ONCOLOGY INC CGON 156944100 $71.0M 3.06% 1,000,000 SH
12 DISC MEDICINE INC IRON 254604101 $64.0M 2.76% 875,000 SH
13 MAZE THERAPEUTICS INC MAZE 578784100 $57.7M 2.49% 1,935,000 SH
14 DYNE THERAPEUTICS INC DYN 26818M108 $56.6M 2.44% 2,550,000 SH
15 MOONLAKE IMMUNOTHERAPEUTICS MLTX 61559X104 $52.1M 2.24% 2,675,000 SH
16 OCULAR THERAPEUTIX INC OCUL 67576A100 $52.0M 2.24% 5,300,000 SH
17 DESIGN THERAPEUTICS INC DSGN 25056L103 $43.4M 1.87% 3,000,000 SH
18 OLEMA PHARMACEUTICALS INC OLMA 68062P106 $40.1M 1.73% 3,208,875 SH
19 BELITE BIO INC BLTE 07782B104 $38.5M 1.66% 250,000 SH
20 ACHIEVE LIFE SCIENCE INC ACHV 004468500 $35.4M 1.53% 5,425,000 SH
21 TREVI THERAPEUTICS INC TRVI 89532M101 $35.1M 1.51% 1,880,000 SH
22 COGENT BIOSCIENCES INC COGT 19240Q201 $34.8M 1.50% 900,000 SH
23 ARRIVENT BIOPHARMA INC AVBP 04272N102 $34.7M 1.50% 1,000,000 SH
24 CRESCENT BIOPHARMA INC. CBIO G2545C104 $34.2M 1.47% 1,900,000 SH
25 COMPASS PATHWAYS PLC CMPS 20451W101 $31.8M 1.37% 2,250,000 SH
26 MINERALYS THERAPEUTICS INC MLYS 603170101 $28.3M 1.22% 1,050,000 SH
27 REPLIMUNE GROUP INC REPL 76029N106 $27.7M 1.19% 2,500,000 SH
28 XENON PHARMACEUTICALS INC XENE 98420N105 $27.2M 1.17% 450,000 SH
29 STRUCTURE THERAPEUTICS INC GPCR 86366E106 $26.8M 1.16% 500,000 SH
30 IMMUNOVANT INC IMVT 45258J102 $25.6M 1.10% 665,000 SH
31 JADE BIOSCIENCES INC JBIO 008064206 $25.0M 1.08% 1,125,000 SH
32 ENLIVEN THERAPEUTICS INC ELVN 29337E102 $23.6M 1.02% 465,000 SH
33 VERADERMICS INC MANE 922967104 $22.1M 0.95% 180,000 SH
34 AVALO THERAPEUTICS INC AVTX 05338F306 $21.3M 0.91% 1,150,000 SH
35 ARCUS BIOSCIENCES INC RCUS 03969F109 $20.0M 0.86% 650,000 SH
36 SUMMIT THERAPEUTICS INC SMMT 86627T108 $19.7M 0.85% 1,350,000 SH
37 IMMUNOCORE HLDGS PLC IMCR 45258D105 $19.1M 0.82% 600,000 SH
38 LB PHARMACEUTICALS INC LBRX 50180M108 $19.0M 0.82% 585,000 SH
39 MINERVA NEUROSCIENCES INC NERV 603380205 $18.3M 0.79% 3,288,777 SH
40 FAETH THERAPEUTICS INC FTH 81728A207 $18.1M 0.78% 722,020 SH
41 CRISPR THERAPEUTICS AG CRSP H17182108 $16.4M 0.70% 300,000 SH
42 DBV TECHNOLOGIES S A DBVT 23306J309 $15.0M 0.65% 915,000 SH
43 PARABILIS MEDICINES INC PBLS 698955101 $14.4M 0.62% 525,000 SH
44 RHYTHM PHARMACEUTICALS INC RYTM 76243J105 $13.9M 0.60% 125,000 SH
45 VOR BIOPHARMA INC VOR 929033207 $12.0M 0.52% 650,000 SH
46 SCHOLAR ROCK HLDG CORP SRRK 80706P103 $11.0M 0.47% 200,000 SH
47 IMMIX BIOPHARMA INC IMMX 45258H106 $10.3M 0.44% 1,000,000 SH
48 Q32 BIO INC QTTB 746964105 $10.2M 0.44% 800,000 SH
49 ODYSSEY THERAPEUTICS INC ODTX 67613T104 $9.8M 0.42% 521,736 SH
50 ANNEXON INC ANNX 03589W102 $8.6M 0.37% 1,500,000 SH
Filing History
Period Filed AUM Holdings Accession
2026-06-30 2026-08-14 $2.32B 68 0001172661-26-003529
2026-03-31 2026-05-15 $2.00B 66 0001172661-26-002196
2025-12-31 2026-02-17 $1.65B 69 0001172661-26-001209
2025-09-30 2025-11-14 $1.12B 59 0001172661-25-004983
Filer Information
Address
1 LETTERMAN DRIVE
BLDG C, SUITE C3-350
SAN FRANCISCO, CA 94129
Phone
(415) 801-4660
Filing Manager
Logos Global Management LP
San Francisco, CA
Signatory
Derek Gould
GC/CCO