Company: PAYX
Filing Date: 2025-04-09
Form Type: 424B2
Source: 0001193125-25-076822
Chunk: 9

Company: PAYCHEX INC
Filing Date: 2025-04-09
Form: 424B2
Chunk 9
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 employees increasingly become mobile, work remotely, and expect a user experience similar to consumer-oriented applications. We specialize in helping small- to medium-sizedbusinesses who do not have the resources or expertise to adapt to the constantly evolving environment. Paychex offers a full range of integrated HCM solutions from hire to retire for businesses and their employees that allows us to customize our offering to the client’s business, whether it is small or large, simple or complex. We believe that we have the breadth of solutions to cover the spectrum of the employee life cycle, but we also allow integrations with popular HR, accounting, point-of-sale,and productivity applications. The key features of our solutions are:

| • |     | Comprehensive cloud-based platform optimized to meet the HR and payroll needs of small- and medium-sized organizations; |

| • |     | Expertise in HR and payroll with our technology backed by approximately 250 compliance experts and over 650 HR 
 business professionals;                                                                                        |

| • |     | Streamlined workforce management that combines technology with flexible, tech-enabled support options; |

| • |     | Modern, mobile, and intuitive user experience with self-service capabilities; |

| • |     | Scalable and customizable platform that allows clients the ability to add services as they grow; |

| • |     | Software as a service, or “SaaS”, delivery model that reduces total cost of ownership for our clients; 
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| • |     | Advanced data analytics and artificial intelligence capabilities powered by large data sets. |

We market our solutions through a combination of direct and virtual sales forces and ecommerce solutions supported by various digital lead generation and multi-channel marketing initiatives. Over 50% of our revenues are from solutions other than payroll processing. We were incorporated in Delaware in 1979. Our principal executive offices are located at 911 Panorama Trail South, Rochester, New York 14625-2396 and our principal website address is www.paychex.com. Information on or accessible through our website is not incorporated into this prospectus supplement.

S-1

Proposed Acquisition of Paycor

On January 7, 2025, Paychex, Inc., Skyline Merger Sub., Inc., a Delaware corporation and an indirect wholly owned subsidiary of Paychex,
and Paycor entered into an Agreement and Plan of Merger (the “Merger Agreement”) to acquire Paycor (the “Acquisition”), a leading provider of HCM, payroll and talent software. The closing of the Acquisition is subject to certain