Significant Ownership of 683 Capital Management, LLC

Large-stake snapshot 1 signal
Large-stake filing summary
  • Recent SEC Schedule 13D/G filings for 683 Capital Management, LLC focus on large-stake beneficial ownership disclosures and amendments.
  • Use this view to spot new large holders, amended positions, and activist-style ownership evidence.
Manager Names, identifiers, and filing context for this profile. 2 identity fields
Manager signature
Ari Zweiman - Managing Member
Manager location
New York, NY

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Significant Ownership of 683 Capital Management, LLC

Sym Company Class Ownership Holdings Value Net Change Nb Shares Change % Reporting Name Report Period
GOSS Gossamer Bio, Inc. Common Stock, $0.0001 par value 10% $16,955,314 +$13,782,671 49,868,571 +434% 683 Capital Management, LLC 04 Jun 2026
MREO Mereo BioPharma Group plc American Depositary Shares, each representing five ordinary shares, nominal value of 0.003 GBP per share 8.2% $27,120,426 65,083,815 683 Capital Management, LLC 29 Dec 2025
INAB IN8BIO, INC. Common Stock, $0.0001 par value per share 7.9% $1,510,072 770,445 683 Capital Management, LLC 22 Dec 2025
PCSC Perceptive Capital Solutions Corp Class A ordinary shares, $0.0001 par value 7.2% $8,703,341 640,894 683 Capital Management, LLC 31 Dec 2025
MRSN Mersana Therapeutics, Inc. Common Stock, par value $0.0001 per share 7% $10,215,484 +$2,264,431 351,289 +28% 683 Capital Management, LLC 31 Dec 2025
GUTS FRACTYL HEALTH, INC. Common Stock, $0.00001 par value per share 4.8% $3,515,728 +$253,903 7,679,615 +7.8% 683 Capital Management, LLC 31 Mar 2026
MODD Modular Medical, Inc. Common Stock, $0.001 par value per share 4.7% $41,478 -$1,282,867 259,240 -97% 683 Capital Management, LLC 31 Mar 2026
AFMD Affimed N.V. Common Shares, nominal value 0.01 per share 4.3% $582,594 654,600 683 Capital Management, LLC 31 Dec 2024
INSE Inspired Entertainment, Inc. Common stock, par value $0.0001 per share 4.2% $10,552,500 -$5,393,500 1,125,000 -34% 683 Capital Management, LLC 02 Jul 2025
IMUX IMMUNIC, INC. Common Stock, par value $0.0001 per share 3.4% $550,072 -$8,149,928 474,200 -94% 683 CAPITAL MANAGEMENT, LLC 31 Mar 2026
RVPH REVIVA PHARMACEUTICALS HOLDINGS, INC. Common Stock, par value $0.0001 per share 3% $1,257,300 -$699,300 3,492,500 -36% 683 CAPITAL MANAGEMENT, LLC 31 Dec 2025
MRSN Mersana Therapeutics, Inc. Common Stock, par value $0.0001 per share 0% $0 0 683 Capital Management, LLC 31 Mar 2026

Schedules 13D/G Reported by 683 Capital Management, LLC:

Sym Target Class Ownership Change Current shares Change Value Reporting name Form Report period Filing date
Schedule rows are parsed from SEC 13D/G filings. Open the linked filing or target page to verify the reported ownership and shares.
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