Mangrove Partners

SEC CIK: 0001535392
Latest filing: Aug 14, 2026

SEC filings (opens in a new tab)

BIIB holding history

Biogen Inc. in every 13F filed by Mangrove Partners, including the quarters it was sold out or no filing was made. Changes compare share counts with the previous calendar quarter.

BIIB overview All 13F holders of BIIB Full Q2 2026 holdings

Shares (Q4 2024): 0; Sold out in Q4 2024
Value: $0
% of portfolio: 0.0%
Quarters held: 2; Since Q3 2021

Holdings of BIIB by Mangrove Partners, by quarter
Quarter	Shares	Value	% of portfolio	Share change	Action	All holders
Q4 2024	0	$0	0.0%	−4,582−100.0%	Sold out	Holders
Q3 2024	4,582	$888.2K	0.1%	+4,582	New	Holders
Q4 2021	0	$0	0.0%	−45,872−100.0%	Sold out	Holders
Q3 2021	45,872	$13.0M	1.4%	+45,872	New	Holders