X0306 4 2021-09-11 0 0001590955 Paycom Software, Inc. PAYC 0001594487 Richison Chad R. 7501 W. MEMORIAL ROAD OKLAHOMA CITY OK 73142 1 1 1 0 President and CEO Common Stock 2021-05-19 5 G 0 E 10000 0.00 D 4868177 D Common Stock 2021-05-20 5 G 0 E 10000 0.00 D 4858177 D Common Stock 2021-05-25 5 G 0 E 10000 0.00 D 4848177 D Common Stock 2021-08-10 5 G 0 E 75000 0.00 D 4773177 D Common Stock 2021-09-11 4 F 0 35702 475.63 D 4737475 D Common Stock 3670999 I By Ernest Group, Inc. Common Stock 56 I By Abrie R. Richison 2012 Irrevocable Trust U/T/A DTD 12/21/2012 Common Stock 90 I By Ava L. Richison 2012 Irrevocable Trust U/T/A DTD 12/21/2012 Common Stock 90 I By Ian D. Richison 2012 Irrevocable Trust U/T/A DTD 12/21/2012 Includes 1,711,500 unvested shares of restricted stock. Represents shares of common stock of Paycom Software, Inc. (the "Issuer") withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting of 80,500 shares of restricted stock granted to the reporting person on January 30, 2020. No shares were issued or sold in this transaction. Includes 1,631,000 unvested shares of restricted stock. Represents shares of common stock owned by Ernest Group, Inc. ("Ernest Group"). The reporting person is the sole director of Ernest Group and Ernest Group is wholly owned by the reporting person and certain trusts for the reporting person's children, for which the reporting person serves as trustee. The reporting person may be deemed to beneficially own the shares of common stock owned by Ernest Group. Represents shares of common stock owned by the Abrie R. Richison 2012 Irrevocable Trust U/T/A DTD 12/21/2012 (the "Abrie R. Richison 2012 Irrevocable Trust"). The reporting person is the settlor and sole trustee for the Abrie R. Richison 2012 Irrevocable Trust, which is for the benefit of the reporting person's child. The reporting person may be deemed to beneficially own the shares of common stock owned by the Abrie R. Richison 2012 Irrevocable Trust. Represents shares of common stock owned by the Ava L. Richison 2012 Irrevocable Trust U/T/A DTD 12/21/2012 (the "Ava L. Richison 2012 Irrevocable Trust"). The reporting person is the settlor and sole trustee for the Ava L. Richison 2012 Irrevocable Trust, which is for the benefit of the reporting person's child. The reporting person may be deemed to beneficially own the shares of common stock owned by the Ava L. Richison 2012 Irrevocable Trust. Represents shares of common stock owned by the Ian D. Richison 2012 Irrevocable Trust U/T/A DTD 12/21/2012 (the "Ian D. Richison 2012 Irrevocable Trust"). The reporting person is the settlor and sole trustee for the Ian D. Richison 2012 Irrevocable Trust, which is for the benefit of the reporting person's child. The reporting person may be deemed to beneficially own the shares of common stock owned by the Ian D. Richison 2012 Irrevocable Trust. /s/ Chad R. Richison 2021-09-14