SELECTIVE INSURANCE GROUP INC

We classify our business into four reportable segments:

•Standard Commercial Lines;

•Standard Personal Lines;

•Excess and Surplus Lines ("E&S Lines"); and

•Investments.

For more details about these segments, refer to Note 1. "Organization" and Note 12. "Segment Information" in Item 8. "Financial Statements and Supplementary Data." of this Form 10-K.

We write our Standard Commercial and Standard Personal Lines products and services through nine of our insurance subsidiaries, some of which participate in the federal government's National Flood Insurance Program's ("NFIP") Write Your Own Program ("WYO"). We write our E&S products through another subsidiary, Mesa Underwriters Specialty Insurance Company, a nationally-authorized non-admitted platform for customers who generally cannot obtain coverage in the standard marketplace. Collectively, we refer to our ten insurance subsidiaries as the "Insurance Subsidiaries."

The following is Management's Discussion and Analysis ("MD&A") of our consolidated financial condition and results of operations. Included in the MD&A is an evaluation of the amounts and certainty of cash flows from operations and outside sources, trends, and uncertainties that may have a material impact in future periods. The MD&A discusses and analyzes our 2023 results compared to 2022. Investors should read the MD&A in conjunction with Item 8. "Financial Statements and Supplementary Data." of this Form 10-K. For discussion and analysis of our 2022 results compared to 2021, refer to Item 7. "Management’s Discussion and Analysis of Financial Condition and Results of Operations." of our Annual Report on Form 10-K for the fiscal year ended December 31, 2022.

In the MD&A, we will discuss and analyze the following:

•Critical Accounting Policies and Estimates;

•Financial Highlights of Results for Years Ended December 31, 2023, 2022, and 2021;

•Results of Operations and Related Information by Segment;

•Federal Income Taxes; and

•Liquidity and Capital Resources.