Business Overview and Business Strategy and Part II, Item 8. Note 17, Segment Information , in the Notes to the Consolidated Financial Statements included in this Annual Report on Form 10-K for more information.
Revenues for fiscal 2025 were $2,321.7 million, an increase of 5.4% from the comparable prior year. The growth in revenues was driven by a 4.4% increase in organic revenues, a 0.9% increase from acquisition-related revenues and a net increase of 0.1% from foreign currency exchange rate fluctuations. Revenues increased in all our segments, primarily in the Americas. Revenues increased primarily from workstations and to a lesser extent, CGS and front office solutions. Refer to Part II, Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations, Non-GAAP Financial Measures, of this Annual Report on Form 10-K for a definition of organic revenues and a reconciliation between revenues and organic revenues.
As of August 31, 2025, organic annual subscription value ("Organic ASV") totaled $2,370.9 million, an increase of 5.7% over the prior year. Organic ASV increased in all our segments, with the majority of the increase in the Americas. Organic ASV growth was mainly driven by workstations, data solutions and, to a lesser extent, CGS. Refer to Part II, Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations, Annual Subscription Value, of this Annual Report on Form 10-K for the definition of Organic ASV.
Operating margin was 32.2% for fiscal 2025, compared with 31.8% for fiscal 2024. This increase in operating margin was mainly due to growth in revenues and, when expressed as a percentage of revenues, charges related to the Sales Tax Dispute that were recorded in the prior year, partially offset by higher amortization of intangible assets in the current year. Refer to Part II, Item 8. Note 12, Commitments and Contingencies in the Notes to the Consolidated Financial Statements of this Annual Report on Form 10-K for more information on the Sales Tax Dispute.