X0306 4 2021-08-09 0 0001592058 Party City Holdco Inc. PRTY 0001829648 Thompson Sean C/O PARTY CITY HOLDCO INC. 80 GRASSLANDS ROAD ELMSFORD NY 10523 0 1 0 0 See Remarks Common Stock, par value $0.01 per share ("Common Stock") 2021-08-09 4 A 0 166415 0.00 A 847421 D The shares reported are restricted stock units granted to the Reporting Person under the Issuer's Amended and Restated 2012 Omnibus Equity Incentive Plan. Each stock units represents a contingent right to receive one share of Common Stock. The shares shall vest in full on August 9, 2024, subject to the Reporting Person's continued employment by the Issuer through the vesting date. 37,962 shares were automatically withheld to satisfy tax withholding obligations. Executive Vice President and Chief Commercial Officer /s/ Ian Heller, attorney-in-fact 2021-08-11