Quest Diagnostics — Apr 21, 2026 release

Patients have engaged Quest AI Companion approximately 350,000 times since we rolled it out to users of our myQuest patient app earlier this quarter. • Advanced our planning and design work for Project Nova, our multi-year initiative to transform our order-to-cash processes and systems, with plans to implement our first wave of solutions in the fall of 2027. 1 Three Months Ended March 31, 2026 2025 Change (dollars in millions, except per share data) Reported: Net revenues $ 2,895  $ 2,652  9.2  % Diagnostic Information Services revenues $ 2,832  $ 2,589  9.4  % Revenue per requisition (1.3) % Requisition volume 10.9  %   Organic requisition volume 10.8  % Operating income (a) $ 399  $ 346  15.5  % Operating income as a percentage of net revenues (a) 13.8  % 13.0  % 0.8  % Net income attributable to Quest Diagnostics (a) $ 252  $ 220  14.4  % Diluted EPS (a) $ 2.24  $ 1.94  15.5  % Cash provided by operations $ 278  $ 314  (11.6) % Capital expenditures $ 114  $ 117  (1.8) % Adjusted (a): Operating income $ 447  $ 406  10.0  % Operating income as a percentage of net revenues 15.4  % 15.3  % 0.1  % Net income attributable to Quest Diagnostics $ 281  $ 251  12.1  % Diluted EPS $ 2.50  $ 2.21  13.1  % (a) For further details impacting the year-over-year comparisons related to operating income, operating income as a percentage of net revenues, net income attributable to Quest Diagnostics, and diluted EPS, see note 2 of the financial tables attached below. Updated Guidance for Full Year 2026 The company updates its full year 2026 guidance a