Tenable grants director Charles H. Bell 10,386 stock units

The award is scheduled to vest in three annual installments beginning October 5, 2027, subject to continued director service, with acceleration in specified circumstances.

Rhea-AI Filing Summary

Tenable Holdings, Inc. director Charles H. Bell received an award of 10,386 restricted stock units on October 5, 2026. Each RSU represents a contingent right to receive one share of common stock. One-third of the RSUs shall vest on each of October 5, 2027, October 5, 2028, and October 5, 2029, subject to his continued service as a director through the applicable vesting dates, with accelerated vesting in specified circumstances.

Insider Trade Summary

Grant/Award: 10,386 shares

Grant/Award 1 txn

Insider Bell Charles H

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Units F1, F2	10,386	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units — 10,386 contracts (Direct)

Footnotes (2)

1. F1. Each restricted stock unit ("RSU") represents a contingent right to receive one share of Issuer common stock.
2. F2. One third of the RSUs shall vest on each of October 5, 2027, October 5, 2028 and October 5, 2029, subject to the Reporting Person's continued service as a director through the applicable vesting dates and accelerated vesting in specified circumstances.

Key Figures

RSUs awarded: 10,386 restricted stock units Underlying common shares: 10,386 shares Vesting portion: One-third +3 more

6 metrics

RSUs awarded 10,386 restricted stock units Award to director Charles H. Bell on October 5, 2026

Underlying common shares 10,386 shares Each RSU represents a contingent right to receive one common share

Vesting portion One-third Vests on each of three stated dates

First vesting date October 5, 2027 One-third of the RSUs

Second vesting date October 5, 2028 One-third of the RSUs

Third vesting date October 5, 2029 One-third of the RSUs

Key Terms

restricted stock unit ("RSU"), contingent right, accelerated vesting

3 terms

restricted stock unit ("RSU") financial

"Each restricted stock unit ("RSU") represents a contingent right"

contingent right financial

"represents a contingent right to receive one share"

accelerated vesting financial

"and accelerated vesting in specified circumstances"

A contract feature that makes stock awards, options, or restricted shares become owned or exercisable earlier than the original schedule. It shortens or cancels the waiting period so recipients can sell, transfer, or exercise their equity sooner — think of a timed lock that is unlocked ahead of schedule. It matters to investors because it changes when shares enter the market, who controls them, and how much dilution or ownership concentration happens.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many RSUs did TENB director Charles H. Bell receive?

Charles H. Bell received an award of 10,386 restricted stock units on October 5, 2026. Each RSU represents a contingent right to receive one share of Tenable Holdings, Inc. common stock.

When do Charles H. Bell's TENB RSUs vest?

One-third of the RSUs shall vest on each of October 5, 2027, October 5, 2028, and October 5, 2029, subject to his continued service as a director through the applicable vesting dates, with accelerated vesting in specified circumstances.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/06/2026 - 04:10 PM Accepted by SEC EDGAR 10/06/2026 - 04:10 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Bell Charles H

(Last) (First) (Middle)

C/O TENABLE HOLDINGS, INC.

6100 MERRIWEATHER DRIVE

(Street)

COLUMBIA MARYLAND 21044

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Tenable Holdings, Inc. [ TENB ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/05/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Units	(1)	10/05/2026		A		10,386		(2)	(2)	Common Stock	10,386	$0	10,386	D

Explanation of Responses:

1. Each restricted stock unit ("RSU") represents a contingent right to receive one share of Issuer common stock.

2. One third of the RSUs shall vest on each of October 5, 2027, October 5, 2028 and October 5, 2029, subject to the Reporting Person's continued service as a director through the applicable vesting dates and accelerated vesting in specified circumstances.

Remarks:

	/s/ David Bartholomew, Attorney-in-Fact	10/06/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)