X0508 4 2023-12-13 0001177648 ENANTA PHARMACEUTICALS INC ENTA 0001572282 Vance Terry C/O ENANTA PHARMACEUTICALS, INC. 500 ARSENAL STREET WATERTOWN MA 02472 1 0 0 0 0 Common Stock 2023-12-13 4 S 0 15295 9.12 D 5800 D The price reported in Column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $8.80 to $9.56, inclusive. The reporting person undertakes to provide to Enanta Pharmaceuticals, Inc., any security holder of Enanta Pharmaceuticals, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote of this Form 4. /s/ Nathaniel S. Gardiner as attorney-in-fact 2023-12-15