X0202 SCHEDULE 13G/A 0000820027 XXXXXXXX LIVE 2 Common Stock 05/31/2026 0001660280 Tenable Holdings, Inc. 88025T102 6100 Merriweather Drive Columbia MD 21044 Rule 13d-1(b) Ameriprise Financial, Inc. b DE 0 13536242 0 15063544 15063544 N 13.7 HC Columbia Management Investment Advisers, LLC b MN 0 13536242 0 14056072 14056072 N 12.7 IA Columbia Seligman Technology and Information Fund b MA 8878977 0 0 8878977 8878977 N 8.1 IV Tenable Holdings, Inc. 6100 Merriweather Drive, Columbia, MD 21044 (a) Ameriprise Financial, Inc. ("AFI") (b) Columbia Management Investment Advisers, LLC ("CMIA") (c) Columbia Seligman Technology and Information Fund ("Fund") (a) 145 Ameriprise Financial Center, Minneapolis, MN 55474 (b) 290 Congress Street, Boston, MA 02210 (c) 290 Congress Street, Boston, MA 02210 (a) Delaware (b) Minnesota (c) Massachusetts N HC Incorporated by reference to Items (5)-(9) and (11) of the cover page pertaining to each reporting person. CMIA and AFI do not directly own any shares of Common Stock of the issuer. As the investment adviser to the Fund and various other unregistered and registered investment companies and other managed accounts, CMIA may be deemed to beneficially own the shares reported herein by the Fund. Accordingly, the shares reported herein by CMIA include those shares separately reported herein by the Fund. As the parent holding company of CMIA, AFI may be deemed to beneficially own the shares reported herein by CMIA. Accordingly, the shares reported herein by AFI include those shares separately reported herein by CMIA. Each of AFI and CMIA, and the subsidiaries identified on the attached Exhibit I, disclaims beneficial ownership of any shares reported on this Schedule. The information required by Item 4(b) is set forth in Rows (5)-(9) and (11) of the cover page for each Reporting Person hereto and is incorporated herein by reference for each Reporting Person. The information required by Item 4(c) is set forth in Rows (5)-(9) and (11) of the cover page for each Reporting Person hereto and is incorporated herein by reference for each Reporting Person. The information required by Item 4(c) is set forth in Rows (5)-(9) and (11) of the cover page for each Reporting Person hereto and is incorporated herein by reference for each Reporting Person. The information required by Item 4(c) is set forth in Rows (5)-(9) and (11) of the cover page for each Reporting Person hereto and is incorporated herein by reference for each Reporting Person. The information required by Item 4(c) is set forth in Rows (5)-(9) and (11) of the cover page for each Reporting Person hereto and is incorporated herein by reference for each Reporting Person. Y N To the knowledge of AFI, CMIA and the Fund, no other persons besides AFI, CMIA and the Fund and those persons for whose shares of common stock CMIA and AFI report beneficial ownership have the right to receive or the power to direct the receipt of dividends from or the proceeds from the sale of the securities of the issuer reported herein. As of May 31, 2026, only the Fund owned more than 5% of the class of securities reported herein. Any remaining shares reported herein by CMIA are held by various other funds or accounts managed by CMIA which each have the right to receive any dividends paid by the issuer and could terminate their respective investment advisory relationship with CMIA and then subsequently direct the use of proceeds from the sale of the common stock owned by such fund or account. To CMIA's knowledge, none of these other funds or accounts own more than 5% of the outstanding shares of the issuer as of May 31, 2026. N AFI: See Exhibit I Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11. Exhibit Index Exhibit I Identification and Classification of the Subsidiary which Acquired the Security Being Reported on by the Parent Holding Company. Exhibit II Joint Filing Agreement Ameriprise Financial, Inc. /s/ Michael G. Clarke 06/05/2026 Columbia Management Investment Advisers, LLC /s/ Michael G. Clarke 06/05/2026 Columbia Seligman Technology and Information Fund /s/ Michael G. Clarke 06/05/2026 Contact Information Charles Chiesa VP Fund Treasurer Global Operations and Investor Services Telephone: 617-385-9593