ACORN CAPITAL ADVISORS, LLC — 13F Holdings & Portfolio
CIK 2054410 · latest 13F-HR filed 2026-08-14
ACORN CAPITAL ADVISORS, LLC manages $366.5M in 13F-reported U.S. long-equity assets across 20 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are CGON (21.94%), URGN (16.80%), TRVI (10.92%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 1 new position and exited 3; 13 existing positions rose in reported value and 5 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
$366.5M
Long-equity book
Holdings
20
Distinct positions
Period
2026-06-30
Filed 2026-08-14
Q/Q Activity
+1 / −3 / ↑13 / ↓5
vs 2026-03-31
Portfolio charts
Latest quarter's book, what changed, and how the portfolio has evolved across filings.
Portfolio map
Q2 26Box 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 valueSectors from each company's SIC code; funds and ETFs grouped separately.
Biggest buys and sells
Q1 26 → Q2 26Estimated 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 quartersTotal reported 13F value (bars) and number of positions (line) each quarter. Value changes include market moves.
Top positions over time
reported valueThe eight largest current positions, valued at each quarter end.
Concentration
top 10 = 90.2%Cumulative share of the portfolio held in the largest N positions.
Firm Profile & Key People
As of the firm’s regulatory filing dated Mar 19, 2026.
Assets Under Management
$2.96B
Discretionary
$1.87B
Employees
22
Accounts
7
Address
590 MADISON AVENUE
30TH FLOOR
NEW YORK, NY 10022
30TH FLOOR
NEW YORK, NY 10022
Phone
(212) 303-4344
| Name | Title / Status | Ownership | Type |
|---|---|---|---|
| ACORN ADVISORY CAPITAL MANAGEMENT LLC Control | GENERAL PARTNER since Jun 2005 | Less than 5% | Domestic Entity |
| BUILD ASSET MANAGEMENT Control | GENERAL PARTNER since Nov 2016 | Less than 5% | Domestic Entity |
| COULTER, CHAD, WILLIAM Control | GENERAL COUNSEL since Jan 2021 | Less than 5% | Individual |
| DELPHI FINANCIAL GROUP, INC. Control | OWNER since Dec 2020 | 75% or more | Domestic Entity |
| FLEMING, CATHERINE, MARIE Control | CHIEF OPERATING OFFICER AND CHIEF COMPLIANCE OFFICER since Jul 1995 | Less than 5% | Individual |
| SHERMAN, DONALD, ALAN Control | PRESIDENT AND CEO, INVESTMENT COMMITTEE MEMBER since Jan 2021 | Less than 5% | Individual |
| DELPHI FINANCIAL GROUP, INC. Control Indirect owner via ACORN ADVISORY CAPITAL MANAGEMENT LLC | OWNER since Dec 2020 | 75% or more | Domestic Entity |
| DELPHI FINANCIAL GROUP, INC. Control Indirect owner via BUILD ASSET MANAGEMENT | OWNER since Dec 2020 | 75% or more | Domestic Entity |
| TOKIO MARINE & NICHIDO FIRE INSURANCE COMPANY Control Indirect owner via DELPHI FINANCIAL GROUP, INC. | OWNER since Dec 2020 | 75% or more | Foreign Entity |
| TOKIO MARINE HOLDINGS INC Control Indirect owner via TOKIO MARINE & NICHIDO FIRE INSURANCE COMPANY | OWNER since Mar 1944 | 75% or more | Foreign Entity |
Ownership & leadership changes · 14 filings with changes since Mar 30, 2012
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.
Mar 19, 2026 filing
- No longer listedBUILD CAPITAL MANAGEMENT, LLC · GENERAL PARTNER · Less than 5% · control person · listed since Nov 2016
- No longer listedDELPHI FINANCIAL GROUP, INC. · OWNER · 75% or more · indirect via BUILD CAPITAL MANAGEMENT, LLC · control person · listed since Dec 2020
- AddedBUILD ASSET MANAGEMENT · GENERAL PARTNER · Less than 5% · control person
- AddedDELPHI FINANCIAL GROUP, INC. · OWNER · 75% or more · indirect via BUILD ASSET MANAGEMENT · control person
Mar 19, 2024 filing
- AddedTOKIO MARINE HOLDINGS INC · OWNER · 75% or more · indirect via TOKIO MARINE & NICHIDO FIRE INSURANCE COMPANY · control person
Mar 22, 2023 filing
- AddedTOKIO MARINE & NICHIDO FIRE INSURANCE COMPANY · OWNER · 75% or more · indirect via DELPHI FINANCIAL GROUP, INC. · control person
Jul 21, 2021 filing
- ChangedSHERMAN, DONALD, ALAN · title INVESTMENT COMMITTEE MEMBER → PRESIDENT AND CEO, INVESTMENT COMMITTEE MEMBER; ownership 10–25% → Less than 5%
Mar 25, 2021 filing
- AddedCOULTER, CHAD, WILLIAM · GENERAL COUNSEL · Less than 5% · control person
- ChangedSHERMAN, DONALD, ALAN · title PRESIDENT AND CEO, INVESTMENT COMMITTEE MEMBER → INVESTMENT COMMITTEE MEMBER; ownership Less than 5% → 10–25%
Jan 14, 2021 filing
- No longer listedGERSTENHABER, DAVID, EZRA · CHIEF INVESTMENT OFFICER · Less than 5% · control person · listed since Sep 2018
- No longer listedKIRATSOUS, STEPHAN, ARTHUR · PARTNER OF INVESTMENT ADVISOR · 5–10% · control person · listed since Oct 2018
- No longer listedROSENKRANZ, ROBERT · CHAIRMAN OF INVESTMENT COMMITTEE · 75% or more · control person · listed since Jan 1982
- No longer listedROSENKRANZ, ROBERT · 100% OWNER · 75% or more · indirect via ACORN ADVISORY CAPITAL MANAGEMENT LLC · control person · listed since Jun 2005
- No longer listedROSENKRANZ, ROBERT · 100% OWNER · 75% or more · indirect via BUILD CAPITAL MANAGEMENT LLC · control person · listed since Nov 2016
- No longer listedSABOT, GARY, WAYNE · DIRECTOR - RISK MANAGEMENT · Less than 5% · control person · listed since Dec 1993
- AddedDELPHI FINANCIAL GROUP, INC. · OWNER · 75% or more · control person
- AddedDELPHI FINANCIAL GROUP, INC. · OWNER · 75% or more · indirect via ACORN ADVISORY CAPITAL MANAGEMENT LLC · control person
- AddedDELPHI FINANCIAL GROUP, INC. · OWNER · 75% or more · indirect via BUILD CAPITAL MANAGEMENT, LLC · control person
- ChangedACORN ADVISORY CAPITAL MANAGEMENT LLC · ownership 10–25% → Less than 5%
- ChangedBUILD CAPITAL MANAGEMENT, LLC · ownership 75% or more → Less than 5%
- ChangedSHERMAN, DONALD, ALAN · title INVESTMENT COMMITTEE MEMBER → PRESIDENT AND CEO, INVESTMENT COMMITTEE MEMBER; ownership 10–25% → Less than 5%
Mar 19, 2019 filing
- AddedKIRATSOUS, STEPHAN, ARTHUR · PARTNER OF INVESTMENT ADVISOR · 5–10% · control person
- ChangedSHERMAN, DONALD, ALAN · ownership Less than 5% → 10–25%
Mar 29, 2018 filing
- No longer listedPAO, NORMAN, MARKS · CHIEF INVESTMENT OFFICER · Less than 5% · control person · listed since Apr 2008
- AddedGERSTENHABER, DAVID, EZRA · CHIEF INVESTMENT OFFICER · Less than 5% · control person
Mar 21, 2017 filing
- AddedBUILD CAPITAL MANAGEMENT, LLC · GENERAL PARTNER · 75% or more · control person
- AddedROSENKRANZ, ROBERT · 100% OWNER · 75% or more · indirect via BUILD CAPITAL MANAGEMENT LLC · control person
Mar 28, 2016 filing
- ChangedROSENKRANZ, ROBERT · title CHAIRMAN OF INVESTMENT COMMITTEE / OWNER OF R&CO. CAPITAL MANAGMENT LLC → CHAIRMAN OF INVESTMENT COMMITTEE
Older changes (5 more filings)
Apr 24, 2015 filing
- No longer listedROSENKRANZ ROBERT · 100% OWNER · 75% or more · indirect via ACORN ADVISORY CAPITAL MANAGEMENT LLC · control person · listed since Jun 2005
- AddedROSENKRANZ, ROBERT · 100% OWNER · 75% or more · indirect via ACORN ADVISORY CAPITAL MANAGEMENT LLC · control person
- ChangedACORN ADVISORY CAPITAL MANAGEMENT LLC · ownership 50–75% → 10–25%
Mar 24, 2015 filing
- AddedROSENKRANZ ROBERT · 100% OWNER · 75% or more · indirect via ACORN ADVISORY CAPITAL MANAGEMENT LLC · control person
Mar 28, 2014 filing
- No longer listedHSBC GUYERZELLER TRUST COMPANY CAYMAN ISLANDS · TRUSTEE · General partner, trustee or manager · indirect via THE ROBERT ROSENKRANZ TRUST · control person · listed since May 2006
- No longer listedTHE ROBERT ROSENKRANZ TRUST · MEMBER · 75% or more · indirect via ACORN ADVISORY CAPITAL MANAGEMENT LLC · control person · listed since Jun 2005
- No longer listedTHE ROBERT ROSENKRANZ TRUST · OWNER OF R & CO. CAPITAL MANAGEMENT LLC · 75% or more · control person · listed since Dec 2005
- ChangedROSENKRANZ, ROBERT · title CHAIRMAN OF INVESTMENT COMMITTEE → CHAIRMAN OF INVESTMENT COMMITTEE / OWNER OF R&CO. CAPITAL MANAGMENT LLC
Mar 26, 2013 filing
- No longer listedRAYROUX, GEORGES · TRUSTEE · General partner, trustee or manager · indirect via THE ROBERT ROSENKRANZ TRUST · listed since Sep 1994
- AddedHSBC GUYERZELLER TRUST COMPANY CAYMAN ISLANDS · TRUSTEE · General partner, trustee or manager · indirect via THE ROBERT ROSENKRANZ TRUST · control person
Mar 30, 2012 filing (earliest on record)
- ListedACORN ADVISORY CAPITAL MANAGEMENT LLC · GENERAL PARTNER · 50–75% · control person
- ListedFLEMING, CATHERINE, MARIE · CHIEF OPERATING OFFICER AND CHIEF COMPLIANCE OFFICER · Less than 5% · control person
- ListedPAO, NORMAN, MARKS · CHIEF INVESTMENT OFFICER · Less than 5% · control person
- ListedRAYROUX, GEORGES · TRUSTEE · General partner, trustee or manager · indirect via THE ROBERT ROSENKRANZ TRUST
- ListedROSENKRANZ, ROBERT · CHAIRMAN OF INVESTMENT COMMITTEE · 75% or more · control person
- ListedSABOT, GARY, WAYNE · DIRECTOR - RISK MANAGEMENT · Less than 5% · control person
- ListedSHERMAN, DONALD, ALAN · INVESTMENT COMMITTEE MEMBER · Less than 5% · control person
- ListedTHE ROBERT ROSENKRANZ TRUST · MEMBER · 75% or more · indirect via ACORN ADVISORY CAPITAL MANAGEMENT LLC · control person
- ListedTHE ROBERT ROSENKRANZ TRUST · OWNER OF R & CO. CAPITAL MANAGEMENT LLC · 75% or more · 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.
Top Adds (vs prior quarter)
- UROGEN PHARMA LTD$31.5M +104.7%
- CANDEL THERAPEUTICS INC$18.8M +109.3%
- TREVI THERAPEUTICS INC$14.4M +56.3%
- KARYOPHARM THERAPEUTICS INC$13.2M +825.2%
- JADE BIOSCEINCES INC$10.9M +98.4%
Top Trims
- PROTARA THERAPEUTICS INC-$2.4M -26.7%
- VERASTEM INC-$2.2M -27.9%
- LEONABIO, INC.-$691.6K -10.6%
- JASPER THERAPEUTICS-$638.1K -51.4%
- BIOATLA INC-$417.4K -48.3%
Exited Positions
- TERNS PHARMACEUTICALS INC$92.1M
- CARDIF ONCOLOGY INC$2.9M
- X4 PHARMACEUTICALS INC$966.6K
ACORN CAPITAL ADVISORS, LLC 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 | CG ONCOLOGY INC | CGON | 156944100 | $80.4M | 21.94% | 1,131,500 | SH |
| 2 | UROGEN PHARMA LTD | URGN | M96088105 | $61.6M | 16.80% | 1,673,420 | SH |
| 3 | TREVI THERAPEUTICS INC | TRVI | 89532M101 | $40.0M | 10.92% | 2,144,844 | SH |
| 4 | CANDEL THERAPEUTICS INC | CADL | 137404109 | $36.0M | 9.83% | 3,497,948 | SH |
| 5 | PUMA BIOTECHNOLOGY INC | PBYI | 74587V107 | $33.5M | 9.14% | 4,131,299 | SH |
| 6 | JADE BIOSCEINCES INC | JBIO | 008064206 | $21.9M | 5.98% | 986,760 | SH |
| 7 | BICARA THERAPEUTICS | BCAX | 055477103 | $19.1M | 5.21% | 643,381 | SH |
| 8 | KARYOPHARM THERAPEUTICS INC | KPTI | 48576U205 | $14.8M | 4.05% | 1,518,113 | SH |
| 9 | ONKURE THERAPEUTICS INC | OKUR | 68277Q105 | $12.9M | 3.53% | 2,839,674 | SH |
| 10 | HELUS PHARMA INC. | HELP | 23256X407 | $10.2M | 2.78% | 1,540,266 | SH |
| 11 | PROTARA THERAPEUTICS INC | TARA | 74365U107 | $6.7M | 1.83% | 1,752,115 | SH |
| 12 | AURA BIOSCIENCES INC | AURA | 05153U107 | $6.6M | 1.80% | 929,077 | SH |
| 13 | LEONABIO, INC. | LONA | 04746L203 | $5.8M | 1.59% | 634,539 | SH |
| 14 | VERASTEM INC | VSTM | 92337C203 | $5.6M | 1.53% | 1,469,153 | SH |
| 15 | WHITEHAWK THERAPEUTICS INC | WHWK | 00032Q104 | $5.2M | 1.42% | 1,139,363 | SH |
| 16 | Q32 BIO INC. | QTTB | 746964105 | $2.8M | 0.75% | 216,171 | SH |
| 17 | EUGENE THERAPEUTICS | ENGN | 29286X101 | $2.2M | 0.60% | 1,271,257 | SH |
| 18 | JASPER THERAPEUTICS | JSPR | 471871202 | $604.0K | 0.16% | 1,438,159 | SH |
| 19 | BIOATLA INC | BCAB | 09077B104 | $447.6K | 0.12% | 108,126 | SH |
| 20 | VYNE THERAPEUTICS INC | VYNE | 92941V308 | $926 | 0.00% | 1,425 | SH |
Filing History
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-06-30 | 2026-08-14 | $366.5M | 20 | 0001636587-26-000067 |
| 2026-03-31 | 2026-05-15 | $351.8M | 22 | 0001636587-26-000029 |
| 2025-12-31 | 2026-02-17 | $295.1M | 21 | 0001636587-26-000005 |
| 2025-09-30 | 2025-11-17 | $197.0M | 20 | 0001636587-25-000060 |
Filer Information
Address
420 LEXINGTON AVENUESUITE 2626
NEW YORK, NY 10170
Phone
(212) 299-4777
Filing Manager
ACORN CAPITAL ADVISORS, LLC
NEW YORK, NY
Signatory
Anders Hove
Manager