 Bill Nygren Trades, Portfolio, manager of the Oakmark Fund, disclosed this week that his firms top six trades for the first quarter of 2021 included the closure of its positions in Aptiv PLC APTV , Financial and Parker Hannifin Corp. PH , Financial, new stakes in Altria Group Inc. MO , Financial and ConocoPhillips COP , Financial and boosts to its holdings in Regeneron Pharmaceuticals Inc. REGN , Financial and Fiserv Inc. FISV , Financial. 