Weiss Asset Management LP — 13F Holdings & Portfolio
CIK 1357550 · latest 13F-HR filed 2026-08-14
Weiss Asset Management LP manages $9.54B in 13F-reported U.S. long-equity assets across 624 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are NVDA (11.04%), MU (9.00%), SMCIP (2.61%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 422 new positions and exited 281; 92 existing positions rose in reported value and 92 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
$9.54B
Long-equity book
Holdings
624
Distinct positions
Period
2026-06-30
Filed 2026-08-14
Q/Q Activity
+422 / −281 / ↑92 / ↓92
vs 2026-03-31
Portfolio charts
Latest quarter's book, what changed, and how the portfolio has evolved across filings.
Portfolio map
Q2 26NVDA11.8% · newMU9.6% · newMHIFF6.6% · newSMCI6.4% · newSMCIP2.8% · newTSLA2.1% · newBAPA2.1% · newNEEPV1.4% · newTBPH1.4% · newCEF1.4% · newHOOD1.2% · newXOVR1.2% · newALBPA1.2% · newROIV1.0% · newHPEPC1.0% · newSPCX1.0% · newMRVL1.0% · newUGI0.9% · newCOR0.9% · newVSH0.9% · newNVST0.9% · newTTEK0.8% · newGBX0.8% · newFRPT0.8% · newMUX0.7% · newUAL0.6% · newMSTR0.6% · newGME0.6% · newEPRPC0.6% · newPSLV0.6% · newMED0.6% · newMLTX0.6% · newFE0.5% · newAPO0.5% · newPHYS0.5% · newIBIT0.5% · newMCHPP0.5% · newCVX0.5% · newBMNR0.5% · newVRTX0.4% · newPPLC0.4% · newRIVN0.4% · newQXO0.4% · newXLP0.4% · newKKR0.4% · newPATK0.4% · newCEG0.3% · newIREN0.3% · newPSN0.3% · newBRK.B0.3% · newCLBT0.3% · newGD0.3% · newCDE0.3% · newRONB0.3% · newSARO0.3% · newIJR0.3% · newSWX0.3% · newAIV0.3% · newCORZ0.3% · newVIAV0.3% · new
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 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 = 45.7%Cumulative share of the portfolio held in the largest N positions.
Firm Profile & Key People
As of the firm’s regulatory filing dated Mar 20, 2026.
Assets Under Management
$15.56B
Discretionary
$15.56B
Employees
139
Accounts
2
Address
222 BERKELEY STREET
16TH FLOOR
BOSTON, MA 02116
16TH FLOOR
BOSTON, MA 02116
Phone
(617) 778-7780
This firm reports 3 disclosure items on its registration.
| Name | Title / Status | Ownership | Type |
|---|---|---|---|
| NIKITIN, GEORGIY Control | CHIEF COMPLIANCE OFFICER since Sep 2008 | Less than 5% | Individual |
| RINALDI, MATTHEW, JOSEPH Control | VICE PRESIDENT, CHIEF OPERATING OFFICER since Sep 2008 | Less than 5% | Individual |
| RUIZ, ERIC, LITMAN Control | GENERAL COUNSEL since Mar 2023 | Less than 5% | Individual |
| WAM EMPLOYEE LLC Control | LIMITED PARTNER since Feb 2025 | 75% or more | Domestic Entity |
| WAM GP LLC Control | GENERAL PARTNER since Jan 2010 | Less than 5% | Domestic Entity |
| WEISS, ANDREW, MURRAY Control | CHIEF EXECUTIVE OFFICER OF GENERAL PARTNER since May 2017 | 25–50% | Individual |
| WAM GP LLC Control Indirect owner via WAM EMPLOYEE LLC | MANAGER since Feb 2025 | General partner, trustee or manager | Domestic Entity |
| WEISS, ANDREW, MURRAY Control Indirect owner via WAM GP LLC | MEMBER, MANAGER AND CHIEF EXECUTIVE OFFICER since May 2017 | 75% or more | Individual |
| WEISS, ANDREW, MURRAY Control Indirect owner via WAM EMPLOYEE LLC | MEMBER since Feb 2025 | General partner, trustee or manager | Individual |
Ownership & leadership changes · 10 filings with changes since Feb 14, 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 20, 2026 filing
- No longer listedRAUSCH, EMMA · CHIEF PEOPLE OFFICER · Less than 5% · control person · listed since Mar 2024
Jul 10, 2025 filing
- No longer listedFU, DANIEL, XUN · PRESIDENT OF GENERAL PARTNER · Less than 5% · control person · listed since Jul 2022
Mar 11, 2025 filing
- No longer listedBRADFORD, DANIEL, PHILIP · CHIEF LEGAL OFFICER · Less than 5% · control person · listed since Jan 2008
- AddedWAM EMPLOYEE LLC · LIMITED PARTNER · 75% or more · control person
- AddedWAM GP LLC · MANAGER · General partner, trustee or manager · indirect via WAM EMPLOYEE LLC · control person
- AddedWEISS, ANDREW, MURRAY · MEMBER · General partner, trustee or manager · indirect via WAM EMPLOYEE LLC · control person
- ChangedWEISS, ANDREW, MURRAY · ownership 75% or more → 25–50%
Mar 28, 2024 filing
- AddedRAUSCH, EMMA · CHIEF PEOPLE OFFICER · Less than 5% · control person
Mar 30, 2023 filing
- AddedRUIZ, ERIC, LITMAN · GENERAL COUNSEL · Less than 5% · control person
- ChangedBRADFORD, DANIEL, PHILIP · title GENERAL COUNSEL → CHIEF LEGAL OFFICER
Jul 8, 2022 filing
- No longer listedSHERMAN, PAUL · CO-PRESIDENT AND HEAD OF RISK MANAGEMENT OF GENERAL PARTNER · Less than 5% · control person · listed since Sep 2020
- ChangedFU, DANIEL, XUN · title CO-PRESIDENT OF GENERAL PARTNER → PRESIDENT OF GENERAL PARTNER
Sep 21, 2020 filing
- No longer listedMILGRAM, EITAN · EXECUTIVE VICE PRESIDENT OF GENERAL PARTNER · Less than 5% · control person · listed since Jun 2003
- AddedFU, DANIEL, XUN · CO-PRESIDENT OF GENERAL PARTNER · Less than 5% · control person
- ChangedSHERMAN, PAUL · title PRESIDENT OF GENERAL PARTNER → CO-PRESIDENT AND HEAD OF RISK MANAGEMENT OF GENERAL PARTNER
Mar 30, 2020 filing
- ChangedMILGRAM, EITAN · title EXECUTIVE VICE PRESIDENT AND HEAD OF TRADING OF GENERAL PARTNER → EXECUTIVE VICE PRESIDENT OF GENERAL PARTNER
- ChangedSHERMAN, PAUL · title PRESIDENT AND HEAD OF RESEARCH OF GENERAL PARTNER → PRESIDENT OF GENERAL PARTNER
- ChangedWEISS, ANDREW, MURRAY · title CHIEF EXECUTIVE OFFICER AND CHIEF INVESTMENT OFFICER OF GENERAL PARTNER → CHIEF EXECUTIVE OFFICER OF GENERAL PARTNER
Mar 29, 2018 filing
- ChangedSHERMAN, PAUL · title EXECUTIVE VICE PRESIDENT AND HEAD OF RESEARCH OF GENERAL PARTNER → PRESIDENT AND HEAD OF RESEARCH OF GENERAL PARTNER
- ChangedWEISS, ANDREW, MURRAY · title PRESIDENT AND CHIEF INVESTMENT OFFICER OF GENERAL PARTNER → CHIEF EXECUTIVE OFFICER AND CHIEF INVESTMENT OFFICER OF GENERAL PARTNER
- ChangedWEISS, ANDREW, MURRAY · indirect via WAM GP LLC: title MEMBER, MANAGER AND PRESIDENT → MEMBER, MANAGER AND CHIEF EXECUTIVE OFFICER
Mar 30, 2015 filing
- ChangedMILGRAM, EITAN · title EXECUTIVE VICE PRESIDENT, HEAD OF TRADING → EXECUTIVE VICE PRESIDENT AND HEAD OF TRADING OF GENERAL PARTNER
- ChangedRINALDI, MATTHEW, JOSEPH · title VICE PRESIDENT, HEAD OF OPERATIONS → VICE PRESIDENT, CHIEF OPERATING OFFICER
- ChangedSHERMAN, PAUL · title EXECUTIVE VICE PRESIDENT, HEAD OF RESEARCH → EXECUTIVE VICE PRESIDENT AND HEAD OF RESEARCH OF GENERAL PARTNER
- ChangedWEISS, ANDREW, MURRAY · title PRESIDENT AND CHIEF INVESTMENT OFFICER → PRESIDENT AND CHIEF INVESTMENT OFFICER OF GENERAL PARTNER
- ChangedWEISS, ANDREW, MURRAY · indirect via WAM GP LLC: title MEMBER MANAGER AND PRESIDENT → MEMBER, MANAGER AND PRESIDENT
Older changes (1 more filing)
Feb 14, 2012 filing (earliest on record)
- ListedBRADFORD, DANIEL, PHILIP · GENERAL COUNSEL · Less than 5% · control person
- ListedMILGRAM, EITAN · EXECUTIVE VICE PRESIDENT, HEAD OF TRADING · Less than 5% · control person
- ListedNIKITIN, GEORGIY · CHIEF COMPLIANCE OFFICER · Less than 5% · control person
- ListedRINALDI, MATTHEW, JOSEPH · VICE PRESIDENT, HEAD OF OPERATIONS · Less than 5% · control person
- ListedSHERMAN, PAUL · EXECUTIVE VICE PRESIDENT, HEAD OF RESEARCH · Less than 5% · control person
- ListedWAM GP LLC · GENERAL PARTNER · Less than 5% · control person
- ListedWEISS, ANDREW, MURRAY · PRESIDENT AND CHIEF INVESTMENT OFFICER · 75% or more · control person
- ListedWEISS, ANDREW, MURRAY · MEMBER MANAGER AND PRESIDENT · 75% or more · indirect via WAM GP LLC · 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)
- MICRON TECHNOLOGY INC$826.4M +2574.9%
- TESLA INC$143.4M +297.9%
- SUPER MICRO COMPUTER INC$132.1M +165.5%
- SUPER MICRO COMPUTER INC$116.5M +90.2%
- STRATEGY INC$101.0M +124.9%
Top Trims
- SPROTT ASSET MANAGEMENT LP-$146.9M -73.5%
- STRATEGY INC-$67.6M -39.7%
- BITMINE IMMERSION TECHS INC-$43.8M -51.1%
- ISHARES BITCOIN TRUST ETF-$41.0M -46.8%
- KIMBERLY-CLARK CORP-$32.8M -99.3%
New Positions
- SUPER MICRO COMPUTER INC$249.1M
- BOEING CO$188.3M
- SUPER MICRO COMPUTER INC$111.1M
- ENTREPRENEURSHARES SERIES TR$107.3M
- ROIVANT SCIENCES LTD$90.0M
Exited Positions
- HOLOGIC INC$93.0M
- AMICUS THERAPEUTIC$56.0M
- WEIBO CORP$50.8M
- LOCKHEED MARTIN CORP$37.2M
- OVINTIV INC$35.4M
Weiss 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).
| # | Issuer | Symbol | CUSIP | Value | Weight | Shares | Type |
|---|---|---|---|---|---|---|---|
| 1 | NVIDIA CORPORATION | NVDA | 67066G104 | $1.05B | 11.04% | 5,263,485 | SH |
| 2 | MICRON TECHNOLOGY INC | MU | 595112103 | $858.5M | 9.00% | 743,769 | SH |
| 3 | SUPER MICRO COMPUTER INC | SMCIP | 86800U500 | $249.1M | 2.61% | 4,850,000 | SH |
| 4 | SUPER MICRO COMPUTER INC | SMCI | 86800UAD6 | $245.6M | 2.57% | 249,862,000 | PRN |
| 5 | SUPER MICRO COMPUTER INC | SMCI | 86800UAB0 | $212.0M | 2.22% | 230,956,000 | PRN |
| 6 | SUPER MICRO COMPUTER INC Put | SMCI | 86800U302 | $206.7M | 2.17% | 7,046,400 | SH |
| 7 | NVIDIA CORPORATION Put | NVDA | 67066G104 | $200.1M | 2.10% | 1,000,000 | SH |
| 8 | TESLA INC | TSLA | 88160R101 | $191.6M | 2.01% | 455,491 | SH |
| 9 | BOEING CO | BAPA | 097023204 | $188.3M | 1.97% | 2,775,000 | SH |
| 10 | STRATEGY INC | MHIFF | 594972AJ0 | $181.9M | 1.91% | 177,857,000 | PRN |
| 11 | NEXTERA ENERGY INC | NEEPV | 65339F655 | $129.4M | 1.36% | 2,697,000 | SH |
| 12 | THERAVANCE BIOPHARMA INC | TBPH | G8807B106 | $126.8M | 1.33% | 7,457,060 | SH |
| 13 | SPROTT ASSET MANAGEMENT LP | CEF | 85208R101 | $124.7M | 1.31% | 3,099,716 | SH |
| 14 | MICRON TECHNOLOGY INC Put | MU | 595112103 | $121.2M | 1.27% | 105,000 | SH |
| 15 | STRATEGY INC | MHIFF | 594972AN1 | $117.4M | 1.23% | 121,252,000 | PRN |
| 16 | SUPER MICRO COMPUTER INC | SMCI | 86800UAF1 | $111.1M | 1.16% | 125,427,000 | PRN |
| 17 | ROBINHOOD MKTS INC | HOOD | 770700102 | $109.4M | 1.15% | 1,090,686 | SH |
| 18 | ENTREPRENEURSHARES SERIES TR | XOVR | 293828877 | $107.3M | 1.12% | 5,097,483 | SH |
| 19 | ALBEMARLE CORP | ALBPA | 012653200 | $105.9M | 1.11% | 1,910,000 | SH |
| 20 | STRATEGY INC | MHIFF | 594972AQ4 | $102.8M | 1.08% | 100,165,000 | PRN |
| 21 | STRATEGY INC | MHIFF | 594972AL5 | $98.7M | 1.03% | 106,875,000 | PRN |
| 22 | ROIVANT SCIENCES LTD | ROIV | G76279101 | $90.0M | 0.94% | 2,542,652 | SH |
| 23 | HEWLETT PACKARD ENTERPRISE C | HPEPC | 42824C208 | $87.4M | 0.92% | 750,000 | SH |
| 24 | STRATEGY INC | MHIFF | 594972AU5 | $86.4M | 0.91% | 97,266,000 | PRN |
| 25 | SPACE EXPLORATION TECHN CORP | SPCX | 84615Q103 | $86.0M | 0.90% | 503,225 | SH |
| 26 | MARVELL TECHNOLOGY INC | MRVL | 573874104 | $85.3M | 0.89% | 286,219 | SH |
| 27 | UGI CORP NEW | UGI | 902681AB1 | $80.7M | 0.85% | 60,240,000 | PRN |
| 28 | TOPBUILD COR | BLD | 89055F103 | $79.8M | 0.84% | 225,000 | SH |
| 29 | VISHAY INTERTECHNOLOGY INC | VSH | 928298AR9 | $78.1M | 0.82% | 39,339,000 | PRN |
| 30 | ENVISTA HOLDINGS CORPORATION | NVST | 29415FAD6 | $77.2M | 0.81% | 77,224,000 | PRN |
| 31 | TETRA TECH INC NEW | TTEK | 88162GAB9 | $72.1M | 0.76% | 68,289,000 | PRN |
| 32 | GREENBRIER COS INC | GBX | 393657AM3 | $70.8M | 0.74% | 61,697,000 | PRN |
| 33 | FRESHPET INC | FRPT | 358039AB1 | $67.0M | 0.70% | 57,456,000 | PRN |
| 34 | MCEWEN INC. | MUX | 58039PAB3 | $60.2M | 0.63% | 31,300,000 | PRN |
| 35 | UNITED AIRLS HLDGS INC | UAL | 910047109 | $57.8M | 0.61% | 425,223 | SH |
| 36 | STRATEGY INC | MSTR | 594972408 | $54.8M | 0.57% | 629,895 | SH |
| 37 | EPR PPTYS | EPRPC | 26884U208 | $53.4M | 0.56% | 2,067,831 | SH |
| 38 | SPROTT ASSET MANAGEMENT LP | PSLV | 85207K107 | $52.9M | 0.55% | 2,801,789 | SH |
| 39 | MERIT MED SYS INC | MED | 589889AB0 | $50.8M | 0.53% | 47,137,000 | PRN |
| 40 | MOONLAKE IMMUNOTHERAPEUTICS | MLTX | 61559X104 | $50.3M | 0.53% | 2,581,813 | SH |
| 41 | FIRSTENERGY CORP | FE | 337932AV9 | $48.9M | 0.51% | 44,000,000 | PRN |
| 42 | SPROTT ASSET MANAGEMENT LP | PHYS | 85207H104 | $48.6M | 0.51% | 1,611,647 | SH |
| 43 | APOLLO GLOBAL MGMT INC | APO | 03769M304 | $47.2M | 0.49% | 775,000 | SH |
| 44 | ISHARES BITCOIN TRUST ETF | IBIT | 46438F101 | $46.6M | 0.49% | 1,400,417 | SH |
| 45 | MICROCHIP TECHNOLOGY INC. | MCHPP | 595017302 | $46.1M | 0.48% | 600,000 | SH |
| 46 | CHEVRON CORPORATION | CVX | 166764100 | $45.1M | 0.47% | 271,962 | SH |
| 47 | GAMESTOP CORP | GME | 36467WAG4 | $44.6M | 0.47% | 44,000,000 | PRN |
| 48 | BITMINE IMMERSION TECHS INC | BMNR | 09175A206 | $41.8M | 0.44% | 3,142,727 | SH |
| 49 | VERTEX INC | VERX | 92538JAB2 | $36.9M | 0.39% | 41,211,000 | PRN |
| 50 | PPL CORP | PPLC | 69351T866 | $35.7M | 0.37% | 730,000 | SH |
Filing History
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-06-30 | 2026-08-14 | $9.54B | 624 | 0001357550-26-000029 |
| 2026-03-31 | 2026-05-15 | $5.91B | 488 | 0001357550-26-000023 |
| 2026-03-31 | 2026-08-14 | $27.5M | 1 | 0001357550-26-000028 |
| 2025-12-31 | 2026-02-17 | $7.14B | 561 | 0001357550-26-000011 |
| 2025-12-31 | 2026-05-15 | $432.0M | 5 | 0001357550-26-000022 |
| 2025-09-30 | 2026-02-17 | $286.5M | 3 | 0001357550-26-000009 |
Filer Information
Address
222 BERKELEY STREET, 16TH FLOORBOSTON, MA 02116
Phone
(617) 778-7780
Filing Manager
Weiss Asset Management LP
BOSTON, MA
Signatory
Georgiy Nikitin
Chief Compliance Officer