In a regulatory filing on Monday, Nissan disclosed Cayman Islands-registered ECM Master Fund as a shareholder with a 2.5%stake as of end-September. ECM Master Fund is affiliated with Effissimo, according to SEC filings.
An Effissimo spokesperson could not immediately be reached for comment.
In a statement, the car maker said it appreciated all "existing and new shareholders that support and believe in the future potential of Nissan".
Nissan share price hit a four-year-low on Friday following the earnings results. It ended trade on Tuesday up 12.8% at 415.8 yen.
Shareholder activism has gained traction in Japan, where international and domestic investors are demanding firms to improve corporate governance and capital allocation at a record pace, also helped by regulators' guidance.
