MILAN (Reuters) – London-based fund Parvus Asset Management has increased its holding in UniCredit to 5%, becoming the second-biggest investor in the Italian bank, data showed on Monday. A shareholder in mid-sized Italian bank UBI at the time of the Intesa Sanpaolo takeover, Parvus has long been an investor in UniCredit, founder Edoardo Mercadante told Reuters. Parvus has gradually added to its UniCredit stake over time until it crossed the 5% threshold that triggers disclosure obligation, he said. UniCredit is one of the European banks most heavily exposed to Russia and its shares have suffer…