Institutional Manager · CIK 0001357550
Weiss Asset Management LP
BOSTON, MA · File #028-12911
Latest AUM
$7.14B
Positions
561
Top-10 Concentration
62.0%
Filings
20
Portfolio Value Over Time
2024-03
2024-06
2024-09
2024-12
2025-03
2025-06
2025-09
2025-12
Biggest QoQ Changes
Ranked by conviction flow (share change × current price) so mark-to-market moves don't dominate. Price effect column shows how much of the $ change was just the stock moving.
| Action | Issuer | Ticker / CUSIP | Δ Shares | Flow ($) | Price Effect |
|---|---|---|---|---|---|
| REDUCE | TESLA INC | TSLA | -407,909 | -$183.4M | +$2.5M |
| REDUCE | STRATEGY INC | STRK | -1,084,000 | -$164.7M | -$545.7M |
| ADD | NVIDIA CORPORATION | NVDA | +793,701 | +$148.0M | -$467,888 |
| NEW | EXACT SCIENCES CORP | 30063PAB1 | +129,000,000 | +$134.7M | $0 |
| EXITED | IONIS PHARMACEUTICALS INC | 462222AD2 | -107,295,000 | -$132.2M | $0 |
| REDUCE | ISHARES ETHEREUM TR | 46438R105 | -5,813,764 | -$130.4M | -$72.1M |
| REDUCE | ISHARES BITCOIN TRUST ETF | IBIT | -2,256,670 | -$112.0M | -$154.4M |
| NEW | AVADEL PHARMACEUTICALS PLC | G29687103 | +4,515,114 | +$97.3M | $0 |
| REDUCE | COINBASE GLOBAL INC | COIN | -400,538 | -$90.6M | -$59.8M |
| NEW | UGI CORP NEW | 902681AB1 | +60,390,000 | +$85.6M | $0 |
Sector Allocation
Filing History
- 13F HOLDINGS REPORTQ/E Dec 2025561 pos · $7.14B
- 13F HOLDINGS REPORT (Amended)Q/E Dec 20251 pos · $62.5M
- 13F HOLDINGS REPORT (Amended)Q/E Dec 20253 pos · $286.5M
- 13F HOLDINGS REPORT (Amended)Q/E Sep 20251 pos · $67.8M
- 13F HOLDINGS REPORTQ/E Sep 2025593 pos · $8.25B
- 13F HOLDINGS REPORT (Amended)Q/E Jun 20251 pos · $39.3M
- 13F HOLDINGS REPORTQ/E Jun 2025409 pos · $8.66B
- 13F HOLDINGS REPORT (Amended)Q/E Mar 202513 pos · $473.1M
- 13F HOLDINGS REPORTQ/E Mar 2025304 pos · $4.96B
- 13F HOLDINGS REPORT (Amended)Q/E Mar 202515 pos · $201.5M
- 13F HOLDINGS REPORTQ/E Dec 2024601 pos · $4.86B
- 13F HOLDINGS REPORT (Amended)Q/E Dec 20244 pos · $43.5M
- 13F HOLDINGS REPORTQ/E Sep 2024577 pos · $4.34B
- 13F HOLDINGS REPORTQ/E Jun 2024272 pos · $2.65B
- 13F HOLDINGS REPORTQ/E Mar 2024308 pos · $2.91B
- 13F HOLDINGS REPORT (Amended)Q/E Dec 20232 pos · $14.5M
- 13F HOLDINGS REPORT (Amended)Q/E Dec 20232 pos · $1.5M
- 13F HOLDINGS REPORT (Amended)Q/E Dec 20232 pos · $7.0M
- 13F HOLDINGS REPORT (Amended)Q/E Dec 20232 pos · $11.1M
- 13F HOLDINGS REPORT (Amended)Q/E Dec 20232 pos · $1.6M
Top 20 Holdings — Dec 2025
| # | Issuer | Ticker | Shares | Value | % of Portfolio |
|---|---|---|---|---|---|
| 1 | NVIDIA CORPORATION | NVDA | 6,642,294 | $1.24B | 25.69% |
| 2 | ISHARES BITCOIN TRUST ETF | IBIT | 7,801,983 | $387.4M | 8.03% |
| 3 | STRATEGY INC | STRK | 2,121,200 | $322.3M | 6.68% |
| 4 | INTERDIGITAL INC | IDCC | 59,897,000 | $247.3M | 5.13% |
| 5 | STRATEGY INC | STRK | 149,213,000 | $175.1M | 3.63% |
| 6 | STRATEGY INC | STRK | 985,720 | $149.8M | 3.11% |
| 7 | THERAVANCE BIOPHARMA INC | TBPH | 7,457,060 | $139.5M | 2.89% |
| 8 | EXACT SCIENCES CORP | 30063PAB1 | 129,000,000 | $134.7M | 2.79% |
| 9 | SUPER MICRO COMPUTER INC | SMCI | 111,079,000 | $99.4M | 2.06% |
| 10 | AVADEL PHARMACEUTICALS PLC | G29687103 | 4,515,114 | $97.3M | 2.02% |
| 11 | BRIDGEBIO PHARMA INC | BBIO | 50,624,000 | $95.6M | 1.98% |
| 12 | UGI CORP NEW | 902681AB1 | 60,390,000 | $85.6M | 1.78% |
| 13 | GUESS INC | 401617AF2 | 84,105,000 | $83.6M | 1.73% |
| 14 | AUTOMATIC DATA PROCESSING IN | ADP | 320,605 | $82.5M | 1.71% |
| 15 | SUNRUN INC | RUN | 56,977,000 | $80.8M | 1.68% |
| 16 | LINDE PLC | LIN | 148,874 | $63.5M | 1.32% |
| 17 | GREENBRIER COS INC | 393657AM3 | 52,930,000 | $57.3M | 1.19% |
| 18 | ORMAT TECHNOLOGIES INC | ORA | 42,350,000 | $57.2M | 1.19% |
| 19 | EQUINIX INC | EQIX | 72,819 | $55.8M | 1.16% |
| 20 | WEIBO CORP | WEIBF | 47,043,000 | $54.6M | 1.13% |