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Segment Information
 9 Months Ended
Sep. 30, 2025
Segment Reporting [Abstract]  
Segment Information Segment Information
The Company’s products and services are delivered through three reportable segments – Business and Technology Insights, or “Insights”, Conferences and Consulting, as described below.

•Insights equips executives and their teams from every function and across all industries with actionable, objective business and technology insights, guidance and tools. Our experienced experts deliver all this value informed by an unmatched combination of practitioner-sourced and data-driven research to help our clients address their mission critical priorities.

•Conferences provides executives and teams across an organization the opportunity to learn, share and network. From our Gartner Symposium/Xpo series, to industry-leading conferences focused on specific business roles and topics, to peer-driven sessions, our offerings enable attendees to experience the best of Gartner insights and guidance.

•Consulting serves senior executives leading technology-driven strategic initiatives leveraging the power of Gartner’s actionable, objective insights. Through custom analysis and on-the-ground support we enable optimized technology investments and stronger performance on our clients’ mission critical priorities.
The Company's Chief Executive Officer is its chief operating decision maker (CODM). The CODM evaluates segment performance and allocates resources based on gross contribution. Gross contribution, as presented in the tables below, is defined as operating income or loss excluding certain Cost of services and product development expenses, Selling, general and administrative expenses, Depreciation, Amortization of intangibles, Acquisition and integration charges, Goodwill impairment and Gain from sale of divested operation. Certain bonus and fringe benefit costs included in consolidated Cost of services and product development are not allocated to segment expense. The CODM uses gross contribution to allocate resources (including financial resources and employees) for each segment primarily in the Company's annual budgeting process. The CODM then monitors budgeted versus actual results regularly to assess segment operating performance, identify business trends, and modify resource allocations as needed. The accounting policies used by the reportable segments are the same as those used by the Company. There are no intersegment revenues. The Company does not identify or allocate assets, including capital expenditures, by reportable segment. Accordingly, assets are not reported by segment because the information is not available by segment and is not reviewed in the evaluation of segment performance or in making decisions regarding the allocation of resources.

The tables below present information about the Company’s reportable segments for the periods indicated (in thousands).

Three Months Ended September 30, 2025InsightsConferencesConsultingOther (1)Consolidated
Revenues$1,270,724 $74,554 $123,573 $55,221 $1,524,072 
Less:
Personnel expenses282,516 18,389 81,040 5,843 387,788 
Product and content delivery expenses8,102 25,533 3,588 28,738 65,961 
Other expenses (2)5,783 3,320 3,723 571 13,397 
Gross contribution974,323 27,312 35,222 20,069 1,056,926 
Cost of services and product development - unallocated (3)7,072 
Selling, general and administrative762,557 
Depreciation and amortization50,953 
Goodwill impairment 150,000 
Interest expenses and other, net16,862 
Income before income taxes$69,482 

Three Months Ended September 30, 2024InsightsConferencesConsultingOther (1)Consolidated
Revenues$1,209,524 $75,776 $127,622 $71,384 $1,484,306 
Less:
Personnel expenses271,718 16,621 78,406 11,682 378,427 
Product and content delivery expenses7,427 25,765 3,971 39,249 76,412 
Other expenses (2)6,607 2,901 3,728 799 14,035 
Gross contribution923,772 30,489 41,517 19,654 1,015,432 
Cost of services and product development - unallocated (3)6,468 
Selling, general and administrative711,729 
Depreciation and amortization51,252 
Acquisition and integration charges159 
Interest expenses and other, net18,952 
Gain on event cancellation insurance claims(300,000)
Income before income taxes$526,872 
Nine Months Ended September 30, 2025InsightsConferencesConsultingOther (1)Consolidated
Revenues$3,789,798 $358,558 $418,873 $177,427 $4,744,656 
Less:
Personnel expenses850,941 55,015 246,644 26,305 1,178,905 
Product and content delivery expenses19,429 114,901 10,902 96,886 242,118 
Other expenses (2)18,426 12,560 11,158 1,648 43,792 
Gross contribution2,901,002 176,082 150,169 52,588 3,279,841 
Cost of services and product development - unallocated (3)16,164 
Selling, general and administrative2,269,753 
Depreciation and amortization152,452 
Goodwill impairment150,000 
Interest expenses and other, net37,189 
Income before income taxes$654,283 

Nine Months Ended September 30, 2024InsightsConferencesConsultingOther (1)Consolidated
Revenues$3,582,238 $331,929 $405,291 $232,834 $4,552,292 
Less:
Personnel expenses804,736 48,844 233,800 35,409 1,122,789 
Product and content delivery expenses17,466 109,614 10,844 116,854 254,778 
Other expenses (2)17,325 11,615 11,124 2,166 42,230 
Gross contribution2,742,711 161,856 149,523 78,405 3,132,495 
Cost of services and product development - unallocated (3)28,300 
Selling, general and administrative2,113,633 
Depreciation and amortization151,093 
Acquisition and integration charges977 
Interest expenses and other, net52,766 
Gain on event cancellation insurance claims(300,000)
Income before income taxes$1,085,726 

(1)Other includes our Digital Markets operating segment.
(2)Other consists primarily of travel and entertainment and workplace expenses.
(3)The unallocated amounts consist of certain bonus and fringe costs recorded in consolidated Cost of services and product development that are not allocated to segment expense. The Company’s policy is to allocate bonuses to segments at 100% of a segment employee’s target bonus. Amounts above or below 100% are absorbed by corporate.