Madryn Asset Management, LP — 13F Holdings & Portfolio
CIK 1787423 · latest 13F-HR filed 2026-08-19
Madryn Asset Management, LP manages $36.9M in 13F-reported U.S. long-equity assets across 2 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are STIM (65.29%), OMDA (34.71%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 0 new positions and exited 0; 1 existing position rose in reported value and 1 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.
Long-equity book
Distinct positions
Filed 2026-08-19
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 = 100%Cumulative share of the portfolio held in the largest N positions.
As of the firm’s regulatory filing dated Mar 31, 2026.
33RD FLOOR
NEW YORK, NY 10017
| Name | Title / Status | Ownership | Type |
|---|---|---|---|
| AMIN, AVINASH, NAVIN Control | PARTNER since Nov 2016 | Less than 5% | Individual |
| GIRANDOLA, MATTHEW, RUDOLPH Control | CHIEF COMPLIANCE OFFICER since Jan 2022 | Less than 5% | Individual |
| MADRYN ASSET MANAGEMENT GP, LLC Control | GENERAL PARTNER since Nov 2016 | Less than 5% | Domestic Entity |
| MADRYN CAPITAL, LLC Control | MAJORITY OWNER OF THE REGISTRANT since Jan 2024 | 75% or more | Domestic Entity |
| RICCIARDI, JOHN, STEVEN Control | PARTNER / CHIEF FINANCIAL OFFICER since Feb 2017 | Less than 5% | Individual |
| AMIN, AVINASH, NAVIN Control Indirect owner via MADRYN CAPITAL, LLC | MEMBER since Jan 2024 | 50–75% | Individual |
| RICCIARDI, JOHN, STEVEN Control Indirect owner via MADRYN CAPITAL, LLC | MEMBER since Jan 2024 | General partner, trustee or manager | Individual |
| Somers, Pierre, NMN Control Indirect owner via WALTER GROUP INC. | MAJORITY OWNER since Feb 2014 | 75% or more | Individual |
| WALTER CAPITAL MANAGEMENT INC. Control Indirect owner via WALTER GLOBAL ASSET MANAGEMENT INC. | MAJORITY OWNER since Jan 2024 | 50–75% | Foreign Entity |
| WALTER GLOBAL ASSET MANAGEMENT INC. Control Indirect owner via WGAM GENERAL PARTNER INC. | 100% OWNER since Mar 2019 | 75% or more | Foreign Entity |
| WALTER GROUP INC. Control Indirect owner via WALTER CAPITAL MANAGEMENT INC. | 100% OWNER since Nov 2023 | 75% or more | Foreign Entity |
| WGAM GENERAL PARTNER INC. Control Indirect owner via WGAM STRATEGIC PARTNERSHIP FUND LP | GENERAL PARTNER since Apr 2019 | General partner, trustee or manager | Foreign Entity |
| WGAM USA HOLDCO INC. Control Indirect owner via MADRYN CAPITAL, LLC | MEMBER since Jan 2024 | 50–75% | Foreign Entity |
| WALTER GROUP INC. Indirect owner via WGAM STRATEGIC PARTNERSHIP FUND LP | LIMITED PARTNER since Apr 2019 | 25–50% | Foreign Entity |
| WGAM STRATEGIC PARTNERSHIP FUND LP Indirect owner via WGAM USA HOLDCO INC. | 100% OWNER since Jan 2024 | 75% or more | Foreign Entity |
Ownership & leadership changes · 5 filings with changes since Nov 29, 2016
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.
- No longer listedWGAM STRATEGIC PARTNERSHIP FUND LP · MANAGER · 25–50% · indirect via MADRYN CAPITAL, LLC · control person · listed since Jan 2024
- AddedWGAM STRATEGIC PARTNERSHIP FUND LP · 100% OWNER · 75% or more · indirect via WGAM USA HOLDCO INC.
- AddedWGAM USA HOLDCO INC. · MEMBER · 50–75% · indirect via MADRYN CAPITAL, LLC · control person
- ChangedAMIN, AVINASH, NAVIN · indirect via MADRYN CAPITAL, LLC: title MANAGER → MEMBER
- ChangedRICCIARDI, JOHN, STEVEN · indirect via MADRYN CAPITAL, LLC: title MANAGER → MEMBER
- No longer listedAMIN, AVINASH, NAVIN · MEMBER · 75% or more · indirect via MADRYN ASSET MANAGEMENT GP, LLC · control person · listed since Nov 2016
- AddedAMIN, AVINASH, NAVIN · MANAGER · 50–75% · indirect via MADRYN CAPITAL, LLC · control person
- AddedMADRYN CAPITAL, LLC · MAJORITY OWNER OF THE REGISTRANT · 75% or more · control person
- AddedRICCIARDI, JOHN, STEVEN · MANAGER · General partner, trustee or manager · indirect via MADRYN CAPITAL, LLC · control person
- AddedSomers, Pierre, NMN · MAJORITY OWNER · 75% or more · indirect via WALTER GROUP INC. · control person
- AddedWALTER CAPITAL MANAGEMENT INC. · MAJORITY OWNER · 50–75% · indirect via WALTER GLOBAL ASSET MANAGEMENT INC. · control person
- AddedWALTER GLOBAL ASSET MANAGEMENT INC. · 100% OWNER · 75% or more · indirect via WGAM GENERAL PARTNER INC. · control person
- AddedWALTER GROUP INC. · LIMITED PARTNER · 25–50% · indirect via WGAM STRATEGIC PARTNERSHIP FUND LP
- AddedWALTER GROUP INC. · 100% OWNER · 75% or more · indirect via WALTER CAPITAL MANAGEMENT INC. · control person
- AddedWGAM GENERAL PARTNER INC. · GENERAL PARTNER · General partner, trustee or manager · indirect via WGAM STRATEGIC PARTNERSHIP FUND LP · control person
- AddedWGAM STRATEGIC PARTNERSHIP FUND LP · MANAGER · 25–50% · indirect via MADRYN CAPITAL, LLC · control person
- ChangedAMIN, AVINASH, NAVIN · ownership 75% or more → Less than 5%
- AddedAMIN, AVINASH, NAVIN · MEMBER · 75% or more · indirect via MADRYN ASSET MANAGEMENT GP, LLC · control person
- AddedGIRANDOLA, MATTHEW, RUDOLPH · CHIEF COMPLIANCE OFFICER · Less than 5% · control person
- ChangedRICCIARDI, JOHN, STEVEN · title CHIEF COMPLIANCE OFFICER → PARTNER / CHIEF FINANCIAL OFFICER
- No longer listedFARONI, PETER, JAMES · PARTNER · 50–75% · control person · listed since Nov 2016
- ChangedAMIN, AVINASH, NAVIN · ownership 50–75% → 75% or more
- AddedRICCIARDI, JOHN, STEVEN · CHIEF COMPLIANCE OFFICER · Less than 5% · control person
- ChangedAMIN, AVINASH, NAVIN · title PARTNER, CHIEF COMPLIANCE OFFICER → PARTNER
- ListedAMIN, AVINASH, NAVIN · PARTNER, CHIEF COMPLIANCE OFFICER · 50–75% · control person
- ListedFARONI, PETER, JAMES · PARTNER · 50–75% · control person
- ListedMADRYN ASSET MANAGEMENT GP, LLC · GENERAL PARTNER · Less than 5% · 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.
Madryn Asset 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).
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-06-30 | 2026-08-19 | $36.9M | 2 | 0001787423-26-000003 |
| 2026-03-31 | 2026-05-15 | $34.1M | 2 | 0001787423-26-000002 |
| 2025-12-31 | 2026-02-10 | $34.7M | 3 | 0001787423-26-000001 |
| 2023-09-30 | 2023-11-02 | $36.1M | 5 | 0001787423-23-000005 |
33RD FLOOR
NEW YORK, NY 10017