(Bloomberg) Boaz Weinstein is building up positions across UK investment trusts that now account for about a quarter of his $5.4 billion bet on closed-end funds trading near historic discounts. Most Read from BloombergYour 401(k) Will Be Gone Within a DecadeLargest Covid Vaccine Study Yet Finds Links to Health ConditionsPlay VideoUS Tells Allies Russia May Launch Anti-Satellite Nuclear Weapon Into Space This YearBill Ackman Rockets Up Best-Paid Hedge Fund List by Doing Very LittleSaba Capital