SEI Investments Co

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SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

(Name of Registrant as Specified In Its Charter) (Name of Person(s) Filing Proxy Statement, if other than the Registrant) Payment of Filing Fee (Check all boxes that apply): ☒ No fee required. ☐ Fee paid previously with preliminary materials. ☐ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.

Notice of Annual Meeting of Shareholders to be held May 27, 2026

With our core competency pillars of technology, operations, and asset management, the breadth of the markets we serve and capabilities across investment processing, investment operations, and investment management uniquely position us in the financial services industry. We deliver our services standalone or combine multiple capabilities into comprehensive solutions designed to meet the needs of each market we serve globally. Our clients include wealth managers, banks, investment advisors, asset managers, family offices, institutional investors, and ultra-high-net-worth investors.

5,000+ Global employees* $1.9T AUM/AUA* $8.1T Assets processed on our wealth management platforms* 8 & 43 Clients include 8 of top 20 U.S. banks and 43 of the top 100 Investment managers* * As of Dec. 31, 202 5

Technology and Operations • End-to-end platforms and technology infrastructure • Custody/sub-custody processing • Investment processing platforms in SaaS or PaaS models • Cybersecurity, regulatory, and compliance services

Asset Management • Suite of internally managed and third-party investment products • Manager research, asset allocation, and portfolio construction • Direct indexing, factor-based strategies, alternatives, and tax management • Discretionary investment management

Dear Stockholders, As I step into the role of Chairman, I would like to thank Al West for his 57‑year legacy as SEI's founder and Executive Chairman. We are grateful for his lasting influence and are pleased that he will continue to support SEI as Chairman Emeritus. Al's vision, values and commitment to innovation provide a strong foundation for SEI's continued growth and evolution. I have been impressed with how CEO Ryan Hicke and the leadership team at SEI have built upon this legacy of entrepreneurism and transformation to drive significant shareholder value over the past several years. Our 2025 performance reflects the strength of this foundation and the opportunities that lie ahead. SEI delivered another year of meaningful progress marked by broad-based revenue and margin expansion, reflecting a business that is positioned for sustainable long-term growth. These results were driven by the leadership team's focused execution of strategy and the commitment of our workforce to serving clients, strengthening our competitive advantages and creating shareholder value. I am proud of SEI's transformation towards our goal of a fully-integrated enterprise. Our achievements in 2025 are early signs of the power of our evolving horizontal operating model, which is central to our strategic ambitions. 2025 showed us the benefit of better aligned talent, technology and capital to pursue what we believe are the most compelling opportunities in our markets. While we evolve our operating model, we will continue to innovate in ways that deepen client relationships and enhance operational leverage. We are focused on investing with purpose in talent, AI, technology and capabilities to scale our advantages in outsourcing, advice and asset management, while maintaining a prudent approach to capital allocation and balance sheet management. SEI has a clear strategic direction and a business model built to adapt and scale. The Board remains enthusiastically engaged in overseeing execution, capital allocation and risk management, and we are excited for SEI's next phase of growth.

Notice of annual meeting of shareholders .

To elect three directors for a term expiring at our 2029 Annual Meeting of Shareholders;

To approve on an advisory basis the compensation of our named executive officers;

To ratify the appointment of KPMG LLP as independent registered public accountants to examine our consolidated financial statements for 2026 ; and

To transact such other business as may properly come before our 2026 Annual Meeting of Shareholders or any adjournments thereof.

Only shareholders of record at the close of business on March 12, 2026 will be entitled to receive notice of, and to vote at, our 2026 Annual Meeting of Shareholders and any adjournments thereof. Additional information regarding the rules and procedures for participating in and voting during the Annual Meeting will be set forth in our meeting rules of conduct, which shareholders will be able to view prior to or during the virtual meeting. Whether or not shareholders plan to attend our virtual-only 2026 Annual Meeting of Shareholders, SEI urges shareholders to vote and submit their proxies in advance of the meeting by one of the methods described in these proxy materials. By order of the Board of Directors,

Michael N. Peterson, Secretary April 15, 2026 Voting at the annual meeting This year's Annual Meeting will be virtual. You may vote during the meeting pursuant to the rules and procedures for participating in and voting during the meeting set forth in our meeting rules of conduct, which shareholders will be able to view prior to or during the meeting at www.virtualshareholdermeeting.com/SEIC2026 by entering the 16-digit voting control number found on your proxy card or voting instruction form and by following the instructions to vote.

Your vote is important Vote by 11:59 p.m. ET on May 26, 2026 for shares held directly and by 11:59 p.m. ET on May 22, 2026 for shares held in a Plan. Refer to the attached proxy materials or the information forwarded by your bank, broker, or other nominee to see which voting methods are available. Please read both this Proxy Statement and our Annual Report before you cast your vote. They are available free of charge on our website at seic.com/investor-relations .

Date and time Wednesday, May 27, 2026 9 a.m. ET

Location Virtual meeting Our 2026 Annual Meeting will be held in a virtual-only format. Shareholders will not be able to attend our 2026 Annual Meeting of Shareholders in person. Shareholders may attend our 2026 Annual Meeting of Shareholders virtually at www.virtualshareholdermeeting .com/SEIC2026 by entering the 16-digit voting control number found on your proxy card or in your voting instructions.

Internet Go to www.proxyvote.com and follow the instructions. You will need the control number from your proxy card or voting instruction form.

Telephone If your shares are held in the name of a broker, bank or other nominee, follow the telephone voting instructions provided. If your shares are registered in your name, call 1-800-690-6903 and follow the voice prompts. You will need the control number from your proxy card or voting instruction form.

Mail Complete, sign, date, and return the enclosed proxy card or voting instruction card in the postage pre- paid envelope provided.

Table of contents . Letter from the Chairman

Notice of annual meeting of shareholders

Nominees for election at our 2026 annual meeting of shareholders with terms expiring in 2029

Continuing directors with terms expiring in 2027

Continuing directors with terms expiring in 2028

Other governance principles and practices

Consideration of last year's say on pay vote

Base salary and incentive compensation targets

Employment arrangements of our named executive officers

Option exercises and stock awards vested table

Ratification of appointment of independent registered public accountants

Policy on audit committee pre-approval of audit and permissible non-audit services of independent registered public accountants

Nominations and proposals by shareholders for our 2027 annual meeting

Reconciliation of GAAP to non-GAAP measure

Reconciliation of diluted earnings per share to adjusted pre-tax earnings per share

Proxy statement . This Proxy Statement is furnished in connection with the solicitation by the Board of Directors (the "Board") of SEI Investments Company ("SEI," "the Company," "we,"or"our") of proxies for use at our 2026 Annual Meeting of Shareholders to be held on May 27, 2026 , and at any adjournments thereof (our " 2026 Annual Meeting"). 2026 Annual meeting of shareholders Action will be taken at our 2026 Annual Meeting to elect three directors with a term expiring at our 2029 Annual Meeting of Shareholders; to approve on an advisory basis the compensation of our named executive officers; to ratify the appointment of KPMG LLP as independent registered public accountants to examine our consolidated financial statements for 2026 ; and to consider such other business as may properly come before our 2026 Annual Meeting and any adjournments thereof. This Proxy Statement, the accompanying proxy card or voting instruction form and our Annual Report for 2025 will be sent, or otherwise made available, to our shareholders on or about April 15, 2026 . Our 2026 Annual Meeting will be held in a virtual-only format. Shareholders will not be able to attend our 2026 Annual Meeting in person. Shareholders may attend our 2026 Annual Meeting virtually at www.virtualshareholdermeeting.com/SEIC2026 by entering the16-digit voting control number found on your proxy card or your voting instruction form. Shareholders whose shares are held in the name of a broker, bank or other nominee and who need their 16-digit control number should contact their bank, broker or other nominee, and to ensure receipt of the control number in a timely fashion, should do so well in advance of the 2026 Annual Meeting of Shareholders. Voting at the meeting Only the holders of shares of our common stock, par value $.01 per share ("Shares"), of record at the close of business on March 12, 2026 ("Shareholders"), are entitled to vote at our 2026 Annual Meeting. On that date, there were 120,982,101 Shares outstanding and entitled to be voted at our 2026 Annual Meeting. Each Shareholder will have the right to one vote for each Share outstanding in his or her name on our books. See "Ownership of Shares" for information regarding the ownership of Shares by our directors, nominees, officers, and certain shareholders.

Quorum and required votes A majority of the Shares entitled to vote at the 2026 Annual Meeting, present either in person or by proxy, will constitute a quorum for all purposes of the 2026 Annual Meeting. Shares voted on any matter submitted to a vote at the Annual Meeting, under Pennsylvania law, will be considered present for all purposes of the meeting and will therefore be counted for purposes of calculating whether a quorum is present at the Annual Meeting. Under Pennsylvania law and our Articles and Bylaws, if a quorum is present at the meeting: • the three nominees for election as directors will be elected to the Board if the votes cast for each nominee exceed the votes cast against the nominee; • management's proposal to approve on an advisory basis the compensation of our named executive officers as disclosed in this Proxy Statement will be approved if the votes cast in favor of the proposal constitute a majority of the votes which all shareholders present in person or by proxy are entitled to cast; and • the ratification of the appointment of our independent public accountants will be approved if the votes cast in favor of the proposal constitute a majority of the votes which all shareholders present in person or by proxy are entitled to cast. Abstentions are considered votes entitled to be cast on a proposal, but not cast. Therefore, abstentions will have no effect on the election of directors, but will impact the other proposals as they will have the effect of a vote against the proposal. Broker non-votes, which occur solely with respect to "non-routine" matters such as the election of directors or the advisory vote on compensation, are considered not entitled to be cast on those matters. Thus, broker non-votes will have no effect on any of the proposals.

Other voting information Shares represented by each properly executed proxy card will be voted in the manner specified by the respective Shareholder. If instructions to the contrary are not given, such Shares will be voted FOR the election to our Board of the nominees listed herein; FOR management's proposal to approve on an advisory basis the compensation of our named executive officers; and FOR the ratification of the appointment of KPMG LLP as independent registered public accountants to examine our consolidated financial statements for 2026 . If any other matters are properly presented for action at the meeting, the proxy holders will vote the proxies (which confer discretionary authority to vote on such matters) in accordance with their best judgment. Brokers or other nominees who hold Shares for a beneficial owner have the discretion to vote on routine proposals when they have not received voting instructions from the beneficial owner at least ten days prior to the Annual Meeting. Your broker is not permitted to vote on your behalf on the election of directors or the advisory vote proposal on approval of compensation, as well as any other non-routine matters unless you provide specific instructions by completing and returning the proxy card or by following the instructions provided to you by your broker, trustee or nominee to vote your Shares via telephone or the Internet. We expect that brokers and nominees will determine that they have the discretion to vote the Shares held of record by them in the absence of voting instructions from the beneficial holder only on the ratification of the selection of our independent public accountants. As a result, it is important to understand that if you hold your Shares through a broker, you must give your broker specific instructions on how to vote your Shares for them to be counted as votes cast on a number of matters considered at the meeting and to affect the outcome of those votes. You may vote your Shares in one of several ways, depending upon how you own your Shares. If you own shares registered in the name of a bank, broker or other nominee, refer to your proxy card or voting instruction form to see which voting methods are available to you. If you own shares that are registered with our transfer agent in your own name, you may vote on the Internet, by telephone or mail as described on your ballot card or voting instruction form. This year's annual meeting will be virtual. You may vote during the meeting pursuant to the rules and procedures for participating in and voting during the Annual Meeting set forth in our meeting rules of conduct, which shareholders will be able to view prior to or during the meeting at www. virtualshareholdermeeting .com/SEIC2026 by entering the 16-digit voting control number found on your proxy card or your voting instruction form, and by following the instructions to vote. Any record Shareholder giving a proxy or other voting instruction has the right to revoke it by providing written notice of revocation to our Secretary at any time before the proxy or voting instruction is voted. Please read both this Proxy Statement and our Annual Report before you cast your vote.