Blue Apron's stock price is on the rise after Jana Partners announced a sizable stake in the company.

The fund, known for its activist investing, disclosed a 2% stake in the meal delivery company on Monday. The shares Jana acquired are worth about $5.6 million, according to an SEC filing.

Blue Apron rose 4.30% after the news.

Jana also announced it still held about 23.3 million shares of Whole Foods. That investment earned the firm $300 million when the upscale grocer announced its sale to Amazon. Jana encouraged Whole Foods to seek a seller and got its wish in a matter of months.

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