0001660280 2026-02-27 2026-02-27 0001660280 1 2026-02-27 2026-02-27 0001660280 2 2026-02-27 2026-02-27 0001660280 2025-01-01 2025-12-31 shares iso4217:USD pure 0001660280 EX-FILING FEES N/A S-8 S-8 TENABLE HOLDINGS, INC. Equity false Common Stock, par value $0.01 per share,2018 Equity Incentive Plan true 5922499 18.08 107078781.92 0.0001381 0.0001381 14787.58 false Equity Common Stock, par value $0.01 per share,2018 Employee Stock Purchase Plan true 1776749 15.37 27308632.13 0.0001381 0.0001381 3771.33 134387414.05 18558.91 0 18558.91 <span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%;padding-left:7.02pt">Pursuant to Rule 416(a) promulgated under the Securities Act of 1933, as amended (the “</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-style:italic;font-weight:700;line-height:120%">Securities Act</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%">”), this Registration Statement shall also cover any additional shares of common stock of Tenable Holdings, Inc. (the “</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-style:italic;font-weight:700;line-height:120%">Registrant</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%">”) that become issuable under the plans set forth herein by reason of any stock dividend, stock split, recapitalization, or other similar transaction effected that results in an increase to the number of outstanding shares of Registrant’s common stock.</span><div style="margin-bottom:6pt;padding-left:18pt;text-align:justify;text-indent:-18pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%">(2)    Estimated in accordance with Rule 457(c) and (h) solely for purposes of calculating the registration fee on the basis of $18.08, the average of the high and low prices of the Registrant’s common stock as reported on the Nasdaq Global Select Market on February 24, 2026.</span></div><div style="margin-bottom:6pt;padding-left:18pt;text-align:justify;text-indent:-18pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%">(3)    Represents an automatic annual increase equal to 5% of the total number of shares of the Registrant’s capital stock outstanding on December 31</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:5.85pt;font-weight:400;line-height:120%;position:relative;top:-3.15pt;vertical-align:baseline">st</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%"> of the preceding calendar year to the aggregate number of shares of the Registrant’s common stock reserved for issuance under, and which annual increase is provided by, the Registrant’s 2018 Equity Incentive Plan.</span></div><div style="margin-bottom:6pt;padding-left:18pt;text-align:justify;text-indent:-18pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%">(4)    Estimated in accordance with Rule 457(c) and (h) solely for the purpose of calculating the registration fee on the basis of $15.37, the average of the high and low prices of the Registrant’s common stock as reported on the Nasdaq Global Select Market on February 24, 2026, multiplied by 85%, which is the percentage of the price per share applicable to purchases under the 2018 Employee Stock Purchase Plan (the “</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-style:italic;font-weight:700;line-height:120%">2018 ESPP</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%">”).</span></div><div style="margin-bottom:6pt;padding-left:18pt;text-align:justify;text-indent:-18pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%">(5)    Represents an automatic increase equal to 1.5% of the total number of shares of the Registrant’s capital stock outstanding on December 31</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:5.85pt;font-weight:400;line-height:120%;position:relative;top:-3.15pt;vertical-align:baseline">st</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%"> of the preceding calendar year to the aggregate number of shares of the Registrant’s common stock reserved for issuance under, and which annual increase is provided by, the 2018 ESPP.</span></div> <span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%;padding-left:7.02pt">Pursuant to Rule 416(a) promulgated under the Securities Act of 1933, as amended (the “</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-style:italic;font-weight:700;line-height:120%">Securities Act</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%">”), this Registration Statement shall also cover any additional shares of common stock of Tenable Holdings, Inc. (the “</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-style:italic;font-weight:700;line-height:120%">Registrant</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%">”) that become issuable under the plans set forth herein by reason of any stock dividend, stock split, recapitalization, or other similar transaction effected that results in an increase to the number of outstanding shares of Registrant’s common stock.</span><div style="margin-bottom:6pt;padding-left:18pt;text-align:justify;text-indent:-18pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%">(2)    Estimated in accordance with Rule 457(c) and (h) solely for purposes of calculating the registration fee on the basis of $18.08, the average of the high and low prices of the Registrant’s common stock as reported on the Nasdaq Global Select Market on February 24, 2026.</span></div><div style="margin-bottom:6pt;padding-left:18pt;text-align:justify;text-indent:-18pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%">(3)    Represents an automatic annual increase equal to 5% of the total number of shares of the Registrant’s capital stock outstanding on December 31</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:5.85pt;font-weight:400;line-height:120%;position:relative;top:-3.15pt;vertical-align:baseline">st</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%"> of the preceding calendar year to the aggregate number of shares of the Registrant’s common stock reserved for issuance under, and which annual increase is provided by, the Registrant’s 2018 Equity Incentive Plan.</span></div><div style="margin-bottom:6pt;padding-left:18pt;text-align:justify;text-indent:-18pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%">(4)    Estimated in accordance with Rule 457(c) and (h) solely for the purpose of calculating the registration fee on the basis of $15.37, the average of the high and low prices of the Registrant’s common stock as reported on the Nasdaq Global Select Market on February 24, 2026, multiplied by 85%, which is the percentage of the price per share applicable to purchases under the 2018 Employee Stock Purchase Plan (the “</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-style:italic;font-weight:700;line-height:120%">2018 ESPP</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%">”).</span></div><div style="margin-bottom:6pt;padding-left:18pt;text-align:justify;text-indent:-18pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%">(5)    Represents an automatic increase equal to 1.5% of the total number of shares of the Registrant’s capital stock outstanding on December 31</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:5.85pt;font-weight:400;line-height:120%;position:relative;top:-3.15pt;vertical-align:baseline">st</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%"> of the preceding calendar year to the aggregate number of shares of the Registrant’s common stock reserved for issuance under, and which annual increase is provided by, the 2018 ESPP.</span></div> 18.08 15.37