Exhibit 99.1 TTEC Announces Fourth Quarter and Full Year 2023 Financial Results Full Year 2023 Revenue was 2.463Billion,up0.8PercentOperatingIncomewas118.0 Million or 4.8 Percent of Revenue (200.4Millionor8.1PercentofRevenueNon−GAAP)NetIncomewas18.3 Million or 0.7 Percent of Revenue (103.2Millionor4.2PercentofRevenueNon−GAAP)AdjustedEBITDAwas271.5 Million or 11.0 Percent of Revenue Fully Diluted EPS was 0.39,2.18 Non-GAAP Fourth Quarter 2023 Revenue was $626.2 Million, ...