INTEGRAL AD SCIENCE HOLDING CORP. 8-K

What Happened Integral Ad Science Holding Corp. (IAS) filed an 8-K on December 23, 2025 announcing the completion of the previously disclosed merger with Igloo Group. The Merger Agreement is dated September 24, 2025 and names Integral Ad Science Holding Corp., Igloo Group Parent, Inc., and Igloo Group Acquisition Company, Inc. as parties. The company attached a press release announcing the completion (Exhibit 99.1) and filed amended corporate charter and bylaws as exhibits.

Key Details

• Merger completion announced in an 8-K and press release dated December 23, 2025 (Exhibit 99.1).
• Merger Agreement dated September 24, 2025 among IAS, Igloo Group Parent, Inc., and Igloo Group Acquisition Company, Inc. (Exhibit 2.1, incorporated by reference).
• Amended and restated Certificate of Incorporation and Bylaws were filed as Exhibits 3.1 and 3.2.
• The filing reports related actions including entry into and termination of material agreements, creation of a direct financial obligation, change in control, director/officer changes, and potential listing/rights modifications (information incorporated by reference to the filing’s Introduction).

Why It Matters The filing confirms a completed change in corporate control and corresponding governance updates (new charter and bylaws), which can affect shareholder rights, board composition and corporate strategy going forward. Investors should read the attached press release and the amended charter/bylaws to understand any changes to voting rights, share structure, board membership or potential impacts on trading/listing status. The Merger Agreement and any omitted schedules/exhibits are available from the SEC upon request for more detail.