X0206 3 2022-12-16 0 0001437226 Mastech Digital, Inc. MHH 0001701621 Singh Manoj P 675 HERMITAGE CIRCLE PALM BEACH GARDENS FL 33410 0 0 1 0 Common Stock 1850000 I Sunil Wadhwani 2020 Exempt Family Trust Manoj Singh is filing on behalf of the Sunil Wadhwani 2020 Exempt Family Trust, as the sole member of the Trust Protection Committee of the Sunil Wadhwani 2020 Exempt Family Trust. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein. /s/ James Barnes, Attorney-in-Fact 2022-12-23