It was a hedge fund portfolio pitched by Hillary Clinton’s son-in-law, Marc Mezvinsky, as an opportunity to bet on a Greek economic revival.

Now, two years later, the Greece-focused fund is shutting down, after losing nearly 90 percent of its value, according to two investors with direct knowledge of the matter who spoke on the condition of anonymity.

Investors were told last month that the fund would close. The fund, Eaglevale Hellenic Opportunity, had raised $25 million from investors to buy Greek bank stocks and government debt.

Eaglevale Partners, a Manhattan hedge fund firm founded by Mr. Mezvinsky and two former Goldman Sachs colleagues, raised money for the Hellenic fund at a time when some on Wall Street had hopes for a revival in the Greek economy. For a time, Mr. Mezvinsky appeared at hedge fund conferences promoting the Greece investment thesis.