X0306 4 2021-12-28 0 0000883107 NANOPHASE TECHNOLOGIES Corp NANX 0001563513 Cureton Kevin 1319 MARQUETTE DRIVE ROMEOVILLE IL 60446 0 1 0 0 Chief Operating Officer Common Stock 50821 D Common Stock (right to purchase) 0.52 2015-02-13 2024-02-13 Common Stock 25000 25000 D Common Stock (right to purchase) 0.44 2016-02-18 2025-02-18 Common Stock 50000 50000 D Common Stock (right to purchase) 0.42 2017-02-23 2026-02-23 Common Stock 43500 43500 D Common Stock (right to purchase) 0.68 2018-02-21 2027-02-21 Common Stock 50000 50000 D Common Stock (right to purchase) 0.82 2019-05-23 2028-05-23 Common Stock 80000 80000 D Common Stock (right to purchase) 0.51 2020-05-22 2029-05-22 Common Stock 16500 16500 D Common Stock (right to purchase) 0.45 2021-06-18 2027-06-18 Common Stock 90000 90000 D Common Stock (right to purchase) 4.17 2021-12-28 4 A 0 90000 4.17 A 2022-12-28 2028-12-28 Common Stock 90000 90000 D Subject to certain restrictions, beginning on this date, options vest in three equal annual installments. Following the recently reported exercise of 12,393 shares (11/24/21), and the 2nd exercise of 12,607 shares (11/26/21, reported above) this line item represents the 3rd exercise, of 25,000 shares of the total initial grant of 75,000 shares, leaving a balance of 25,000 shares remaining relating to this grant. /s/ Jess Jankowski under UPA for Kevin Cureton 2021-12-30