Exhibit 99.1 News Release ACCO BRANDS REPORTS FOURTH QUARTER AND FULL YEAR 2023 RESULTS AND PROVIDES OUTLOOK FOR 2024 Company Exceeds Full Year 2023 Outlook Full Year • Reported net sales of 1.833billion,withgrossmarginexpanding420basispoints•Operatingincomeof45 million; adjusted operating income grew 17% to 205million•Losspershareof(0.23); adjusted EPS of 1.09,abovetheCompany′soutlook•Netoperatingcashflowimproved51 million, generated adjusted free cash flow of $118 mill ...