Sep. 19 at 7:55 PM
Several companies saw notable activist-investor moves last week (Sept. 11–17, 2025) via SEC 13D filings.
Increases in holdings: Fairmount Funds Management boosted its stake in Dianthus Therapeutics to 4,052,052 shares by buying 600,000 shares at
$33 each, now owning 9.9% of the company. Dianthus shares have risen ~67.6% this year.
Decreases in holdings:
Scorpio Tankers reduced its DHT Holdings stake to 6,157,480 shares, below the 5% reporting threshold; DHT shares are up ~34.3% YTD.
TGP GP A sold 3,573,836 Life Time Group Holdings shares, keeping an 8.1% stake; LTH shares have gained ~24.2% YTD.
American Industrial Partners sold 1.7M V2X shares, reducing its stake to 26.9% and losing a board seat; VVX shares are up ~20.2% YTD.
Access Industries cut Opendoor Technologies holdings to 42,724,914 shares via a 10.87M share sale; OPEN shares have surged ~542.1% YTD.
$DNTH $DHT $LTH $OPEN