Filer Snapshot

Weiss Asset Management LP

CIK 0001357550. SEC filing timeline plus parsed ownership intelligence from 13F, 13D/G, and Forms 3/4/5 where available.

Entity type

Company

Total filings

93

Latest filing

15 May 2026

Industry

n/a

Filing-backed research brief

Start with the SEC data that changes for this CIK

Latest signal: 13F-HR for Q1 2026. Each card links back to the PortfolioSavvy page where the filing evidence is closest.

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Largest parsed holding

NVDA

$973.43M reported value

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13D/G large stake

EMPD

31 Mar 2026 · 6.3% ownership

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Source: SEC Form 13F

13F-HR filed on 15 May 2026 for CIK 0001357550.

View source filing
Notable people
Andrew M. Weiss
Ownership signals CIK-linked ownership evidence from parsed SEC filings. 1 signal
Parsed SEC ownership signals

Parsed SEC ownership coverage

These bars compare filing-backed value available in each disclosure family. Read them as separate lenses, not as one combined ownership total.

13F portfolio$5.42B

Quarterly institutional holdings reported on Form 13F; not total AUM.

Forms 3/4/5 positions$137.26M

Reporting-owner positions with enough filing detail to estimate value.

Latest reported 13F value

13F
$5.42B

Reported market value from the latest parsed Form 13F information table; this is not total assets under management.

Source: SEC Form 13FScope: U.S.-listed equity holdings

Forms 3/4/5 position value

3/4/5
$137.26M

Estimated from parsed Forms 3/4/5 when filings include enough share and price data.

Source: Forms 3/4/5Confidence: Estimated when price data is available

Largest 13F holdings

13F
NVDA PSLV STRATEGY INC SUPER MICRO COMPUTER INC NEEPRV
+11 moreTBPH UGI CORP NEW HOLX IBIT BMNR MSTR CEF GREENBRIER COS INC MCEWEN INC. ALBPRA FOLD

Largest symbols in the latest parsed Form 13F information table.

Freshness: Latest parsed 13F period

Largest linked holdings

Largest issuer positions linked to this CIK across parsed 13F, 13D/G, and Forms 3/4/5 records.

TBPH MRAC THCP

Largest 13F holdings

Largest symbols in the latest parsed Form 13F information table.

NVDA PSLV STRATEGY INC SUPER MICRO COMPUTER INC NEEPRV TBPH UGI CORP NEW HOLX
+8 moreIBIT BMNR MSTR CEF GREENBRIER COS INC MCEWEN INC. ALBPRA FOLD

Largest active 13D stakes

Active large-stake positions disclosed in parsed Schedule 13D filings.

TBPH

Largest active 13G stakes

Passive or institutional large-stake positions disclosed in parsed Schedule 13G filings.

CAN AIV SITC BKKT SCPH SMLR
+4 moreEQC EMPD CNCK New America Acquisition I Corp.
How to read these SEC ownership signals
  • Read each filing family separately: Form 13F, Schedules 13D/G, and Forms 3/4/5 answer different SEC disclosure questions and should not be blended into one ownership total.
  • Use 13F values for visible U.S.-listed equity portfolios, 13D/G rows for large beneficial-owner stakes, and Forms 3/4/5 rows for reporting-owner positions and transactions.
  • Open the linked research path when you need the filing, CIK, issuer, CUSIP, date, or source trail behind a value.
At a glance Names, identifiers, and filing context for this profile. 1 identity field
Business address
222 Berkeley Street, 16 Th Floor, Boston, MA, 02116
EDGAR profile Static EDGAR fields kept behind disclosure so the main profile stays readable. 3 profile fields available
Incorporated in
DE
Fiscal year end
31 December
Former names on EDGAR
WEISS CAPITAL LLC (to 16 Nov 2009)

Filer intelligence

What SEC filings say about Weiss Asset Management LP

A compact read of parsed XML filings. 13F, 13D/G, and Forms 3/4/5 are shown separately because they answer different ownership questions.

Open 13F portfolio Save filer

Quick read

  • Latest parsed 13F shows $5.42B across 472 reported holdings for Q1 2026.
  • Largest parsed 13F holding: NVDA at $973.43M.
  • 5 recent 13D/G stake rows found; top row is EMPD at 6.3% ownership.
  • Forms 3/4/5 show insider context for TBPH worth $76.73M.

SEC source mix

Counts show available parsed rows, not one combined ownership total.

XML parsed
13F portfolio 472 rows

Quarterly institutional portfolio holdings.

Open
13D/G stakes 5 rows

Beneficial ownership and large-stake disclosures.

Open
Forms 3/4/5 4 rows

Officer, director, and 10% owner holdings or transactions.

Open

Top parsed 13F holdings

Visual share of the latest parsed 13F portfolio. Values are reported market value, not a recommendation.

Q1 2026 - 15 May 2026

Top 5 concentration

30%

Share of latest parsed 13F value represented by the visible holdings below.

Top 5 reported value

$1.6B

Compared with $5.42B total 13F value.

Top 5 net change

+$278.21M

Position-value change inside the visible top holdings only.

13F concentration map

A simple visual split of the latest parsed 13F portfolio.

Largest add: PSLV · Largest trim: Interdigital Inc

NVDA PSLV Strategy Inc Super Micro Computer Inc NEEPRV Other holdings

NVDA

18%

Nvidia Corporation

$973.43M

PSLV

3.7%

Sprott Asset Management Lp

$199.76M

NEEPRV

2.4%

Nextera Energy Inc

$128.13M

13D/G large-stake context

EMPD

31 Mar 2026 · Common Stock

6.3%
Issuer page 13D/G history

AIV

31 Mar 2026 · Class A Common Stock

5.7%
Issuer page 13D/G history

TBPH

23 Mar 2026 · Ordinary Share $0.00001 Par Value

14%
Issuer page 13D/G history

CAN

31 Dec 2025 · Class A Ordinary Shares underlying American Depository Shares (each representing 15 Class A Ordinary Shares)

6.6%
Issuer page 13D/G history

Forms 3/4/5 insider context

TBPH

19 Sep 2022 · 10% owner

$76.73M
Issuer page Owner page

MRAC

14 May 2021 · 10% owner

$36.43M
Issuer page Owner page

THCP

30 Jun 2021

$24.1M
Issuer page Owner page

AVDL

13 Feb 2026

$0
Issuer page Owner page

Latest update

What changed recently for Weiss Asset Management LP

New filing available

Latest 13F period: Q1 2026. Open the source-backed page to inspect the fresh filing or facts context.

Update date

15 May 2026

Page type

Filer profile

Latest period

Q1 2026

Institutional portfolio context was refreshed from a 13F filing filed on 15 May 2026.

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Benchmark Context

Benchmark context for this company

Weiss Asset Management LP has a source-backed company facts view where you can compare the latest reported metrics with its own recent history and with peer rankings for the same metric.

Compared with

Start on the facts page for period-to-period context, then open a metric ranking when you want to compare the same reported fact across other SEC-reporting companies.

Why this is notable

Latest 13F period: Q1 2026. That gives you a fresh baseline before you compare this company with peers.

  • Peer comparisons stay conservative: same metric, compatible units, latest valid company row only.
  • Open the facts page first if you want the cleanest path to verification.

Benchmark context is only shown where the app has enough comparable SEC-backed data to keep the interpretation honest.

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SEC filing record

CIK 0001357550 filing coverage

Start with this filing record, then use the linked ownership pages when parsed 13F, 13D/G, Forms 3/4/5, or facts data exists for this CIK.

SEC filings
93
First seen
12 Feb 2014
Latest filing
15 May 2026
Entity
Company

Observed form types

13F-HR 13F-HR/A 3 4 SCHEDULE 13D/A SCHEDULE 13G SCHEDULE 13G/A

CIK-linked evidence first

Weiss Asset Management LP SEC filings Weiss Asset Management LP 13F portfolio Weiss Asset Management LP 13D/G history Weiss Asset Management LP owner filings Open SEC filing index

Latest Filings

Showing the latest 12 of 93 SEC filings for Weiss Asset Management LP.

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13F-HR

13F-HR filing

Filing date
15 May 2026
Reporting date
31 Mar 2026
SEC evidence
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13F-HR/A

13F-HR/A filing

Filing date
15 May 2026
Reporting date
31 Dec 2025
SEC evidence
Open document Open filing
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13F-HR/A

13F-HR/A filing

Filing date
15 May 2026
Reporting date
30 Sep 2025
SEC evidence
Open document Open filing
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SCHEDULE 13G/A

SCHEDULE 13G/A filing

Filing date
11 May 2026
Reporting date
Not listed
SEC evidence
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SCHEDULE 13G

SCHEDULE 13G filing

Filing date
11 May 2026
Reporting date
Not listed
SEC evidence
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SCHEDULE 13G

SCHEDULE 13G filing

Filing date
11 May 2026
Reporting date
Not listed
SEC evidence
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SCHEDULE 13D/A

SCHEDULE 13D/A filing

Filing date
25 Mar 2026
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
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13F-HR

13F-HR filing

Filing date
17 Feb 2026
Reporting date
31 Dec 2025
SEC evidence
Open document Open filing
Next action
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13F-HR/A

13F-HR/A filing

Filing date
17 Feb 2026
Reporting date
30 Sep 2025
SEC evidence
Open document Open filing
Next action
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13F-HR/A

13F-HR/A filing

Filing date
17 Feb 2026
Reporting date
30 Jun 2025
SEC evidence
Open document Open filing
Next action
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SCHEDULE 13G

SCHEDULE 13G filing

Filing date
17 Feb 2026
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
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SCHEDULE 13G/A

SCHEDULE 13G/A filing

Filing date
17 Feb 2026
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
Verify source filing
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