X0306 4 2018-04-10 0 0001720580 resTORbio, Inc. TORC 0001340875 Schor Chen C/O RESTORBIO, INC. 500 BOYLSTON STREET, 12TH FLOOR BOSTON MA 02116 1 1 0 0 President and CEO Common Stock 2018-04-10 4 P 0 2000 8.4574 A 1888363 D The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $8.4048 to $8.4769, inclusive. The reporting person undertakes to provide to resTORbio, Inc., any security holder of resTORbio, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in footnote (1) to this Form 4. /s/ Chen Schor 2018-04-11