Prospector Partners LLC has sharply increased its exposure to Pfizer Inc., buying nearly 54,000 additional shares in the first quarter, according to a recent regulatory filing. The purchase lifts the fund’s stake by 60.9 percent to 142,455 shares, now valued at about $3.61 million.

In a recent transaction, Herbalife director Juan Miguel Mendoza has acquired $33,650 worth of company stock, as reported by Investing.com. The move highlights notable insider activity within the global nutrition company.