 Andreas Halvorsen Trades, Portfolio, founding partner and chief investment officer of Viking Global Investors LP, disclosed in a regulatory SEC 13G filing that his firm entered positions in PepGen Inc. PEPG , Financial last week. The firm also revealed in a quarterly 13F holdings report that its top trades during the first quarter included a new holding in Mastercard Inc. MA , Financial, a reduction to its stake in Glingko Bioworks Holdings Inc. DNA , Financial and the closure of its positions in Humana Inc. HUM , Financial and Twilio Inc. TWLO , Financial. 