#1 The Price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $4.63 to $4.88, inclusive. The reporting person undertakes to provide Psychemedics Corporation, any security holder of Psychemedics Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within such range.

#1 Represents shares withheld to cover tax liability with respect to stock unit awards granted in 2021 that vested on May 13, 2022.

#1 Represents restricted stock units that are to be settled solely in shares of Common Stock. The units vest with respect to 25% of the shares on the first anniversay date of the grant, and with respect to an additional 25% on each of the three anniversary dates thereafter, so long as the recipient remains in the continuous employ of the Issuer through each such respective vesting date,

#1 Represents shares withheld to cover tax liability with respect to stock unit awards granted in 2022 that vested on May 22, 2023.