SEI Investments Co

________________________________________ SEI INVESTMENTS COMPANY (Exact Name of Registrant as Specified in its Charter) ________________________________________ Pennsylvania 23-1707341 (State or Other Jurisdiction of Incorporation or Organization) (I.R.S. Employer Identification No.)

PART I - FINANCIAL INFORMATION Page Item 1. Financial Statements. 2 Consolidated Balance Sheets (Unaudited) -- June 30, 2026 and December 31, 2025 2 Consolidated Statements of Operations (Unaudited) -- For the Three and SIx Months Ended June 30, 2026 and 2025 4 Consolidated Statements of Comprehensive Income (Unaudited) -- For the Three and Six Months Ended June 30, 2026 and 2025 5 Consolidated Statements of Changes in Equity (Unaudited) -- For the Three and Six Months Ended June 30, 2026 and 2025 6 Consolidated Condensed Statements of Cash Flows (Unaudited) -- For the Six Months Ended June 30, 2026 and 2025 8 Notes to Consolidated Financial Statements 10 Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations. 35 Item 3. Quantitative and Qualitative Disclosures About Market Risk. 52 Item 4. Controls and Procedures. 52

PART II - OTHER INFORMATION Item 1. Legal Proceedings. 53 Item 1A. Risk Factors. 53 Item 2. Unregistered Sales of Equity Securities and Use of Proceeds. 53 Item 5. Other Information 53 Item 6. Exhibits. 54 Signatures 55

PART I - FINANCIAL INFORMATION Item 1. Financial Statements.

Consolidated Balance Sheets SEI Investments Company (unaudited) and Subsidiaries (Dollars in thousands, except per-share data)

June 30, 2026 December 31, 2025 Assets Current Assets: Cash and cash equivalents $ 395,664 $ 399,804 Receivables from investment products 60,535 63,317 Receivables, net of allowance for doubtful accounts of $ 1,746 and $ 1,916 783,400 709,748 Securities owned 25,532 33,777 Other current assets 78,095 66,691 Total Current Assets 1,343,226 1,273,337 Property and Equipment, net of accumulated depreciation of $ 481,673 and $ 468,700 151,885 150,434 Operating Lease Right-of-Use Assets 32,345 26,447 Capitalized Software, net of accumulated amortization of $ 688,085 and $ 669,896 227,215 234,272 Investments 318,909 428,004 Assets of Consolidated Variable Interest Entities 206,955 183,994 Goodwill 389,420 354,989 Intangible Assets, net of accumulated amortization of $ 68,666 and $ 49,534 470,524 368,272 Deferred Contract Costs 56,967 53,345 Deferred Income Taxes 8,183 8,048 Deposits Related to Acquisitions 36,210 118,606 Other Assets, net 82,499 60,096 Total Assets $ 3,324,338 $ 3,259,844

The accompanying notes are an integral part of these consolidated financial statements.

Consolidated Balance Sheets SEI Investments Company (unaudited) and Subsidiaries (Dollars in thousands, except per-share data)

June 30, 2026 December 31, 2025 Liabilities, Redeemable Non-controlling Interests and Equity Current Liabilities: Accounts payable $ 10,547 $ 5,404 Accrued liabilities 225,607 359,823 Current portion of long-term debt 3,487 - Current portion of long-term operating lease liabilities 10,169 8,677 Deferred revenue 15,718 13,307 Total Current Liabilities 265,528 387,211 Long-term Debt 29,483 - Liabilities of Consolidated Variable Interest Entities 121,300 108,504 Deferred Income Taxes 13,563 16,842 Long-term Operating Lease Liabilities 24,713 19,885 Other Long-term Liabilities 22,852 23,626 Total Liabilities 477,439 556,068 Commitments and Contingencies Redeemable Non-controlling Interests 311,027 243,959 Equity: Shareholders' Equity: Common stock, $ 0.01 par value, 750,000,000 shares authorized; 119,976,563 and 122,232,251 shares issued and outstanding 1,200 1,222 Capital in excess of par value 1,714,294 1,678,787 Retained earnings 813,820 792,280 Accumulated other comprehensive loss, net ( 29,616 ) ( 24,505 ) Total SEI Shareholders' Equity 2,499,698 2,447,784 Non-controlling interests 36,174 12,033 Total Equity 2,535,872 2,459,817 Total Liabilities, Redeemable Non-controlling Interests and Equity $ 3,324,338 $ 3,259,844

The accompanying notes are an integral part of these consolidated financial statements.

Consolidated Statements of Operations SEI Investments Company (unaudited) and Subsidiaries (Dollars in thousands, except per-share data)

Three Months Ended June 30, Six Months Ended June 30, 2026 2025 2026 2025 Revenues: Asset management, administration and distribution fees $ 513,482 $ 437,543 $ 1,011,466 $ 869,686 Information processing and software servicing fees 128,135 122,058 252,334 241,259 Total revenues 641,617 559,601 1,263,800 1,110,945 Expenses: Subadvisory, distribution and other asset management costs 59,980 49,709 116,726 97,241 Software royalties and other information processing costs 9,677 9,191 19,609 18,272 Compensation, benefits and other personnel 207,839 199,574 414,154 390,358 Stock-based compensation 16,313 13,891 30,809 28,029 Consulting, outsourcing and professional fees 56,269 56,942 110,672 112,943 Data processing and computer related 46,862 41,801 91,735 81,120 Facilities, supplies and other costs 21,453 21,744 41,775 40,499 Amortization 19,137 10,449 37,491 21,159 Depreciation 7,071 7,665 14,327 15,592 Total expenses 444,601 410,966 877,298 805,213 Income from operations 197,016 148,635 386,502 305,732 Net gain from investments 3,550 1,759 3,181 2,252 Interest and dividend income 7,012 9,283 14,174 19,504 Interest expense ( 562 ) ( 92 ) ( 1,035 ) ( 277 ) Gain on sale of business - 94,412 - 94,412 Other income - 4,500 450 4,500 Equity in earnings of unconsolidated affiliates 38,694 33,640 71,170 62,387 Net gain from consolidated variable i