X0306 4/A 2022-02-02 2022-02-03 0 0001667161 Randolph Bancorp, Inc. RNDB 0001675908 Trubiano Louis J. C/O RANDOLPH BANCORP, INC. 2 BATTERYMARCH PARK, SUITE 301 QUINCY MA 02169 1 0 0 0 Common Stock 2022-02-02 4 M 0 13040 14.66 A 22342 D Common Stock 2022-02-02 4 M 0 1500 11.48 A 23842 D Common Stock 53500 D Stock Options (right to buy) 14.66 2022-02-02 4 M 0 13040 0.00 D 2027-10-11 Common Stock 13040 3262 D Stock Options (right to buy) 11.48 2022-02-02 4 M 0 1500 0.00 D 2030-08-12 Common Stock 1500 6000 D Includes 1,410 shares of restricted stock which vest on October 12, 2022; 1,408 shares of restricted stock which vest in annual installments of 352 shares from August 13, 2022; and 500 shares which vest on August 13, 2022. Owned jointly with spouse. The 3,262 options vest on October 12, 2022. The options vest in four annual installments of 1,500 shares from August 13, 2022. Amended to reflect Options Disposed of (D) in Table II, Column 5. /s/ Lauren B. Messmore 2022-02-07