13D/G large-stake feed

Latest 13D/G Reports

Since 06 May 2026. Review filer CIK, subject security, ownership %, and SEC evidence first.

Recent 13D/G signals

Large-stake disclosures to inspect

Start with holder, issuer/security, stake size, and SEC evidence.

13G

Adage Capital Management, L.P. stake in Spartacus Acquisition Corp. II

Holder CIK 0001535978

13G TMTS
CIK
0001535978
Issuer
Spartacus Acquisition Corp. II
Security
TMTS
Source
SEC 13G
Action
Beneficial ownership disclosure
Magnitude
7.8% / 1,800,000 shares
Filed
13 May 2026, 09:54:30 UTC

Check whether this is a new stake, an amended position, or a material ownership change before moving to the issuer page.

13G

Adage Capital Management, L.P. stake in Space Asset Acquisition Corp.

Holder CIK 0001535978

13G SAAQ
CIK
0001535978
Issuer
Space Asset Acquisition Corp.
Security
SAAQ
Source
SEC 13G
Action
Beneficial ownership disclosure
Magnitude
7.6% / 1,800,000 shares
Filed
13 May 2026, 09:52:48 UTC

Check whether this is a new stake, an amended position, or a material ownership change before moving to the issuer page.

13G

Magnetar Financial LLC stake in PROEM ACQUISITION CORP. I

Holder CIK 0001352851

13G PAACW
CIK
0001352851
Issuer
Proem Acquisition Corp. I
Security
PAACW
Source
SEC 13G
Action
Beneficial ownership disclosure
Magnitude
5.4% / 1,000,000 shares
Filed
13 May 2026, 09:52:07 UTC

Check whether this is a new stake, an amended position, or a material ownership change before moving to the issuer page.

13G

Adage Capital Management, L.P. stake in Soren Acquisition Corp.

Holder CIK 0001535978

13G SORNU
CIK
0001535978
Issuer
Soren Acquisition Corp.
Security
SORNU
Source
SEC 13G
Action
Beneficial ownership disclosure
Magnitude
7.5% / 1,980,000 shares
Filed
13 May 2026, 09:51:00 UTC

Check whether this is a new stake, an amended position, or a material ownership change before moving to the issuer page.

13G

Magnetar Financial LLC stake in MOUNTAIN LAKE ACQUISITION CORP. II

Holder CIK 0001352851

13G MLAA
CIK
0001352851
Issuer
Mountain Lake Acquisition Corp. II
Security
MLAA
Source
SEC 13G
Action
Beneficial ownership disclosure
Magnitude
5.4% / 2,000,000 shares
Filed
13 May 2026, 09:50:16 UTC

Check whether this is a new stake, an amended position, or a material ownership change before moving to the issuer page.

13G/A

AQR CAPITAL MANAGEMENT LLC stake in Silicon Valley Acquisition Corp.

Holder CIK 0001167557

13G/A SVAQU
CIK
0001167557
Issuer
Silicon Valley Acquisition Corp.
Security
SVAQU
Source
SEC 13G/A
Action
Beneficial ownership disclosure
Magnitude
5% / 1,105,646 shares
Filed
13 May 2026, 09:48:58 UTC

Check whether this is a new stake, an amended position, or a material ownership change before moving to the issuer page.

Rows shown
2,801-2,850 of 3,993
Per page
50
Current page
57

Schedule 13D/G ownership events

Activist and large-stake radar

Stake size, change direction, reporting filer, issuer, active/passive form type, and SEC evidence.

Visible reports

6

Fresh large-stake filings promoted above the legacy table.

13D/13G mix

0/6

Active-intent candidates versus passive large-stake disclosures.

Largest visible stake

7.8%

Highest class ownership surfaced in the preview cards.

Newest evidence

13 May 2026

Use recency before treating an old large-stake story as fresh.

Signal checks

13D active-intent check

active/control intent, item text, amendments

13G passive stake check

large passive holder disclosure

Stake change direction

ownership percent and share change

Issuer and owner follow-up

issuer, filer history, insider activity, 13F context

SEC-verifiable Schedule 13D/G path

Open the Schedule 13D/G filing, then cross-check insider and Form 13F evidence.

Large-stake signal

Adage Capital Management, L.P.

Spartacus Acquisition Corp. II (TMTS)

Schedule 13G Ownership 7.8% Filing-backed
CIK
000091957426002956
Source
SEC Schedule 13G
Action
Large beneficial ownership stake disclosed
Magnitude
7.8%
Filed
13 May 2026, 09:54:30 UTC
Period
31 Mar 2026

Adage Capital Management, L.P. filed Schedule 13G for Spartacus Acquisition Corp. II (TMTS). Reported class ownership: 7.8%. Open the SEC evidence before treating this as an activist or passive large-stake signal.

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Large-stake signal

Adage Capital Management, L.P.

Space Asset Acquisition Corp. (SAAQ)

Schedule 13G Ownership 7.6% Filing-backed
CIK
000091957426002955
Source
SEC Schedule 13G
Action
Large beneficial ownership stake disclosed
Magnitude
7.6%
Filed
13 May 2026, 09:52:48 UTC
Period
31 Mar 2026

Adage Capital Management, L.P. filed Schedule 13G for Space Asset Acquisition Corp. (SAAQ). Reported class ownership: 7.6%. Open the SEC evidence before treating this as an activist or passive large-stake signal.

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Large-stake signal

Magnetar Financial LLC

PROEM ACQUISITION CORP. I (PAACW)

Schedule 13G Ownership 5.4% Filing-backed
CIK
000110465926059892
Source
SEC Schedule 13G
Action
Large beneficial ownership stake disclosed
Magnitude
5.4%
Filed
13 May 2026, 09:52:07 UTC
Period
31 Mar 2026

Magnetar Financial LLC filed Schedule 13G for PROEM ACQUISITION CORP. I (PAACW). Reported class ownership: 5.4%. Open the SEC evidence before treating this as an activist or passive large-stake signal.

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Large-stake signal

Adage Capital Management, L.P.

Soren Acquisition Corp. (SORNU)

Schedule 13G Ownership 7.5% Filing-backed
CIK
000091957426002954
Source
SEC Schedule 13G
Action
Large beneficial ownership stake disclosed
Magnitude
7.5%
Filed
13 May 2026, 09:51:00 UTC
Period
31 Mar 2026

Adage Capital Management, L.P. filed Schedule 13G for Soren Acquisition Corp. (SORNU). Reported class ownership: 7.5%. Open the SEC evidence before treating this as an activist or passive large-stake signal.

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Large-stake signal

Magnetar Financial LLC

MOUNTAIN LAKE ACQUISITION CORP. II (MLAA)

Schedule 13G Ownership 5.4% Filing-backed
CIK
000110465926059891
Source
SEC Schedule 13G
Action
Large beneficial ownership stake disclosed
Magnitude
5.4%
Filed
13 May 2026, 09:50:16 UTC
Period
31 Mar 2026

Magnetar Financial LLC filed Schedule 13G for MOUNTAIN LAKE ACQUISITION CORP. II (MLAA). Reported class ownership: 5.4%. Open the SEC evidence before treating this as an activist or passive large-stake signal.

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Large-stake signal

AQR CAPITAL MANAGEMENT LLC

Silicon Valley Acquisition Corp. (SVAQU)

Schedule 13G/A Ownership 5% Filing-backed
CIK
000116755726000057
Source
SEC Schedule 13G/A
Action
Large stake reduction disclosed
Magnitude
5%
Filed
13 May 2026, 09:48:58 UTC
Period
31 Mar 2026

AQR CAPITAL MANAGEMENT LLC filed Schedule 13G/A for Silicon Valley Acquisition Corp. (SVAQU). Reported class ownership: 5%. Ownership change: -0.33%. Share change: +0.84%. Open the SEC evidence before treating this as an activist or passive large-stake signal.

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Filed by Symbol Subject Shares owned Ownership % Source
Adage Capital Management, L.P. CIK 0001535978 TMTS Spartacus Acquisition Corp. II 1,800,000 7.8% SEC filing
Adage Capital Management, L.P. CIK 0001535978 SAAQ Space Asset Acquisition Corp. 1,800,000 7.6% SEC filing
Magnetar Financial LLC CIK 0001352851 PAACW PROEM ACQUISITION CORP. I 1,000,000 5.4% SEC filing
Adage Capital Management, L.P. CIK 0001535978 SORNU Soren Acquisition Corp. 1,980,000 7.5% SEC filing
Magnetar Financial LLC CIK 0001352851 MLAA MOUNTAIN LAKE ACQUISITION CORP. II 2,000,000 5.4% SEC filing
AQR CAPITAL MANAGEMENT LLC CIK 0001167557 SVAQU Silicon Valley Acquisition Corp. 1,105,646 5% SEC filing
Adage Capital Management, L.P. CIK 0001535978 FTW Presidio Production Company 2,767,441 10% SEC filing
Magnetar Financial LLC CIK 0001352851 ZKP LAFAYETTE DIGITAL ACQUISITION CORP. I 1,800,000 6.1% SEC filing
Adage Capital Management, L.P. CIK 0001535978 PALOU Paloma Acquisition Corp I 1,350,000 8% SEC filing
Adage Capital Management, L.P. CIK 0001535978 IRD Opus Genetics, Inc. 6,029,775 8.5% SEC filing
Magnetar Financial LLC CIK 0001352851 CUSIP G470AU100 ILLUMINATION ACQUISITION CORP. I 1,850,000 5.9% SEC filing
Magnetar Financial LLC CIK 0001352851 DBCA D. BORAL ACQUISITION I CORP. 1,750,000 5.6% SEC filing
Magnetar Financial LLC CIK 0001352851 CAQ CAMBRIDGE ACQUISITION CORP. 1,700,000 7.2% SEC filing
PRIMECAP MANAGEMENT CO/CA/ CIK 0000763212 XMTR Xometry, Inc. 6,495,497 13% SEC filing
PRIMECAP MANAGEMENT CO/CA/ CIK 0000763212 WHR Whirlpool Corporation 3,746,368 5.8% SEC filing
PRIMECAP MANAGEMENT CO/CA/ CIK 0000763212 LUV Southwest Airlines Co. 47,069,495 9.6% SEC filing
Adage Capital Management, L.P. CIK 0001535978 OIMAU OneIM Acquisition Corp. 2,250,000 7.8% SEC filing
PRIMECAP MANAGEMENT CO/CA/ CIK 0000763212 ELAN Elanco Animal Health Incorporated 45,840,956 9.2% SEC filing
Adage Capital Management, L.P. CIK 0001535978 MUZE Muzero Acquisition Corp 1,575,000 7.6% SEC filing
Adage Capital Management, L.P. CIK 0001535978 MLAA Mountain Lake Acquisition Corp. II 2,100,000 5.7% SEC filing
Adage Capital Management, L.P. CIK 0001535978 MNRO Monro, Inc. 1,548,270 5.2% SEC filing
Adage Capital Management, L.P. CIK 0001535978 MTAL Metals Acquisition Corp. II 1,800,000 7.8% SEC filing
Magnetar Financial LLC CIK 0001352851 BIII BLACK SPADE ACQUISITION III CO. 1,000,000 5.8% SEC filing
Adage Capital Management, L.P. CIK 0001535978 MEVO M Evo Global Acquisition Corp II 2,430,000 8.1% SEC filing
Adage Capital Management, L.P. CIK 0001535978 LEGO Legato Merger Corp. IV 1,800,000 5.8% SEC filing
Adage Capital Management, L.P. CIK 0001535978 KRAQU KRAKacquisition Corp 2,475,000 7.2% SEC filing
Magnetar Financial LLC CIK 0001352851 AACOU ABONY ACQUISITION CORP. I 1,950,000 8.2% SEC filing
Adage Capital Management, L.P. CIK 0001535978 KPTI Karyopharm Therapeutics Inc. 1,821,736 8.1% SEC filing
Adage Capital Management, L.P. CIK 0001535978 IRAB Iris Acquisition Corp II 1,350,000 7.8% SEC filing
Adage Capital Management, L.P. CIK 0001535978 WVE Wave Life Sciences Ltd. 1,000,000 0.53% SEC filing
Adage Capital Management, L.P. CIK 0001535978 IEAGU Infinite Eagle Acquisition Corp. 2,250,000 6.4% SEC filing
Adage Capital Management, L.P. CIK 0001535978 TERN Terns Pharmaceuticals, Inc. 2,124,817 1.8% SEC filing
Adage Capital Management, L.P. CIK 0001535978 TNGX Tango Therapeutics, Inc. 12,809,485 9% SEC filing
Adage Capital Management, L.P. CIK 0001535978 HCIC Hennessy Capital Investment Corp. VIII 1,890,000 7.6% SEC filing
Adage Capital Management, L.P. CIK 0001535978 SDRL Seadrill Ltd 2,463,436 3.9% SEC filing
Adage Capital Management, L.P. CIK 0001535978 FVAV Fortress Value Acquisition Corp. V 2,250,000 7.8% SEC filing
Adage Capital Management, L.P. CIK 0001535978 RLMD Relmada Therapeutics, Inc. 4,763,158 4.5% SEC filing
Adage Capital Management, L.P. CIK 0001535978 NPB Northpointe Bancshares, Inc. 2,601,503 7.5% SEC filing
Adage Capital Management, L.P. CIK 0001535978 FBRX Forte Biosciences, Inc. 950,000 6.8% SEC filing
Adage Capital Management, L.P. CIK 0001535978 FGIIU FG Imperii Acquisition Corp. 1,800,000 7.8% SEC filing
Adage Capital Management, L.P. CIK 0001535978 NBR Nabors Industries Ltd. 740,000 4.7% SEC filing
Adage Capital Management, L.P. CIK 0001535978 CMII Columbus Circle Capital Corp II 1,800,000 7.6% SEC filing
Adage Capital Management, L.P. CIK 0001535978 CAQ Cambridge Acquisition Corp. 1,800,000 7.7% SEC filing
Adage Capital Management, L.P. CIK 0001535978 MNPR Monopar Therapeutics 424,195 6.2% SEC filing
Adage Capital Management, L.P. CIK 0001535978 MIST Milestone Pharmaceuticals Inc. 8,000,000 6.4% SEC filing
Adage Capital Management, L.P. CIK 0001535978 MCB Metropolitan Bank Holding Corp. 584,633 4.8% SEC filing
Adage Capital Management, L.P. CIK 0001535978 BBCQU Bleichroeder Acquisition Corp. II 2,250,000 7.8% SEC filing
Adage Capital Management, L.P. CIK 0001535978 MGTX MeiraGTx Holdings plc 4,000,000 4.9% SEC filing
Adage Capital Management, L.P. CIK 0001535978 ACAAU Averin Capital Acquisition Corp. 2,250,000 8.9% SEC filing
Adage Capital Management, L.P. CIK 0001535978 INO Inovio Pharmaceuticals, Inc. 4,233,529 5.8% SEC filing
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