Outstanding

Range of exercise

price per share

Expiration dates

Common stock warrants issued in 2017 related to Series A convertible preferred stock offering

903,870

$33.30

March 2022

Common stock warrants issued in 2018 related to the January 2018 Offering

1,181,421

$12.00

-

$15.00

January 2023

Common stock warrants issued related to the May 2019 Offering

1,382,913

$5.00

-

$6.11875

May and December 2024

Common stock warrants issued related to the November 2019 Offering

213,570

$0.35

November 2024

Common stock warrants issued related to the December 2019 Offering

313,339

$0.4335

-

$0.6981

December 2024 and June 2025

Common stock warrants issued related to the May 2020 Offering

571,429

$1.31

March 2025

Common stock warrants issued related to May 2020 Investor Warrant Exercise

250,000

$0.5938

November 2025

Common stock warrants issued related to the February 2021 Offering

1,682,927

$1.28

February 2026

6,499,469