X0206 3 2017-06-28 0 0001420565 AILERON THERAPEUTICS INC ALRN 0001710065 AJU IB Investment Co., Ltd. 800 BOYLSTON ST., SUITE 3310 BOSTON MA 02199 0 0 1 0 Series E-3 Preferred Stock Common Stock 443973 I See Footnote Series F Preferred Stock Common Stock 48656 I See Footnote The Series E-3 Preferred Stock is convertible into Common Stock on a 9.937-for-one basis into the number of shares of Common Stock shown in column 3 at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering. The shares have no expiration date. The shares reported herein are held of record by AJU Life Science Overseas Expansion Platform Fund, which is managed by AJU IB Investment (the "Reporting Person"). The Series F Preferred Stock is convertible into Common Stock on a 9.937-for-one basis into the number of shares of Common Stock shown in column 3 at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering. The shares have no expiration date. The shares reported herein are held of record by AJU Growth & Healthcare Fund, which is managed by the Reporting Person. /s/ Derek Yoon 2017-06-28