Tenable SC 13G/A Beneficial ownership report (amended)

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

(Rule 13d-102)

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1(b),

(c), AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2

(Amendment No. 1)*

TENABLE HOLDINGS, INC.

(Name of Issuer)

COMMON STOCK, $0.01 PAR VALUE PER SHARE

(Title of Class of Securities)

88025T102

(CUSIP Number)

December 31, 2019

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

◻ Rule 13d-1(b)

◻ Rule 13d-1(c)

⌧ Rule 13d-1(d)

*	The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP No. 88025T102				13G	Page 2 of 24 Pages

1.	NAMES OF REPORTING PERSONS Insight Venture Partners IX, L.P.
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☐
3.	SEC USE ONLY
4.	CITIZENSHIP OR PLACE OF ORGANIZATION Cayman Islands
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5.	SOLE VOTING POWER 0
		6.	SHARED VOTING POWER 8,122,926
		7.	SOLE DISPOSITIVE POWER 0
		8.	SHARED DISPOSITIVE POWER 8,122,926
9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 8,122,926
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 8.3%(1)
12.	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) PN

(1)	Calculations are based upon 98,187,608 shares of Common Stock of the Issuer outstanding as of November 8, 2019, as set forth in the Form 10-Q of the Issuer filed with the U.S. Securities and Exchange Commission on November 14, 2019.

CUSIP No. 88025T102				13G	Page 3 of 24 Pages

1.	NAMES OF REPORTING PERSONS Insight Venture Partners (Cayman) IX, L.P.
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☐
3.	SEC USE ONLY
4.	CITIZENSHIP OR PLACE OF ORGANIZATION Cayman Islands
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5.	SOLE VOTING POWER 0
		6.	SHARED VOTING POWER 4,036,084
		7.	SOLE DISPOSITIVE POWER 0
		8.	SHARED DISPOSITIVE POWER 4,036,084
9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,036,084
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 4.1%(1)
12.	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) PN

(1)	Calculations are based upon 98,187,608 shares of Common Stock of the Issuer outstanding as of November 8, 2019, as set forth in the Form 10-Q of the Issuer filed with the U.S. Securities and Exchange Commission on November 14, 2019.

CUSIP No. 88025T102				13G	Page 4 of 24 Pages

1.	NAMES OF REPORTING PERSONS Insight Venture Partners (Delaware) IX, L.P.
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☐
3.	SEC USE ONLY
4.	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5.	SOLE VOTING POWER 0
		6.	SHARED VOTING POWER 860,622
		7.	SOLE DISPOSITIVE POWER 0
		8.	SHARED DISPOSITIVE POWER 860,622
9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 860,622
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.9%(1)
12.	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) PN

(1)	Calculations are based upon 98,187,608 shares of Common Stock of the Issuer outstanding as of November 8, 2019, as set forth in the Form 10-Q of the Issuer filed with the U.S. Securities and Exchange Commission on November 14, 2019.

CUSIP No. 88025T102				13G	Page 5 of 24 Pages

1.	NAMES OF REPORTING PERSONS Insight Venture Partners IX (Co-Investors), L.P.
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☐
3.	SEC USE ONLY
4.	CITIZENSHIP OR PLACE OF ORGANIZATION Cayman Islands
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5.	SOLE VOTING POWER 0
		6.	SHARED VOTING POWER 162,141
		7.	SOLE DISPOSITIVE POWER 0
		8.	SHARED DISPOSITIVE POWER 162,141
9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 162,141
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.2%(1)
12.	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) PN

(1)	Calculations are based upon 98,187,608 shares of Common Stock of the Issuer outstanding as of November 8, 2019, as set forth in the Form 10-Q of the Issuer filed with the U.S. Securities and Exchange Commission on November 14, 2019.

CUSIP No. 88025T102				13G	Page 6 of 24 Pages

1.	NAMES OF REPORTING PERSONS Insight Venture Associates IX, L.P.
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☐
3.	SEC USE ONLY
4.	CITIZENSHIP OR PLACE OF ORGANIZATION Cayman Islands
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5.	SOLE VOTING POWER 0
		6.	SHARED VOTING POWER 13,181,773
		7.	SOLE DISPOSITIVE POWER 0
		8.	SHARED DISPOSITIVE POWER 13,181,773
9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 13,181,773
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 13.4%(1)
12.	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) PN

(1)	Calculations are based upon 98,187,608 shares of Common Stock of the Issuer outstanding as of November 8, 2019, as set forth in the Form 10-Q of the Issuer filed with the U.S. Securities and Exchange Commission on November 14, 2019.

CUSIP No. 88025T102				13G	Page 7 of 24 Pages

1.	NAMES OF REPORTING PERSONS Insight Venture Associates IX, Ltd.
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☐
3.	SEC USE ONLY
4.	CITIZENSHIP OR PLACE OF ORGANIZATION Cayman Islands
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5.	SOLE VOTING POWER 0
		6.	SHARED VOTING POWER 13,181,773
		7.	SOLE DISPOSITIVE POWER 0
		8.	SHARED DISPOSITIVE POWER 13,181,773
9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 13,181,773
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 13.4%(1)
12.	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) CO

(1)	Calculations are based upon 98,187,608 shares of Common Stock of the Issuer outstanding as of November 8, 2019, as set forth in the Form 10-Q of the Issuer filed with the U.S. Securities and Exchange Commission on November 14, 2019.

CUSIP No. 88025T102				13G	Page 8 of 24 Pages

1.	NAMES OF REPORTING PERSONS Insight Venture Partners Growth-Buyout Coinvestment Fund, L.P.
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☐
3.	SEC USE ONLY
4.	CITIZENSHIP OR PLACE OF ORGANIZATION Cayman Islands
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5.	SOLE VOTING POWER 0
		6.	SHARED VOTING POWER 3,817,885
		7.	SOLE DISPOSITIVE POWER 0
		8.	SHARED DISPOSITIVE POWER 3,817,885
9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,817,885
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 3.9%(1)
12.	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) PN

(1)	Calculations are based upon 98,187,608 shares of Common Stock of the Issuer outstanding as of November 8, 2019, as set forth in the Form 10-Q of the Issuer filed with the U.S. Securities and Exchange Commission on November 14, 2019.

CUSIP No. 88025T102				13G	Page 9 of 24 Pages

1.	NAMES OF REPORTING PERSONS Insight Venture Partners Growth-Buyout Coinvestment Fund (Cayman), L.P.
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☐
3.	SEC USE ONLY
4.	CITIZENSHIP OR PLACE OF ORGANIZATION Cayman Islands
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5.	SOLE VOTING POWER 0
		6.	SHARED VOTING POWER 3,069,356
		7.	SOLE DISPOSITIVE POWER 0
		8.	SHARED DISPOSITIVE POWER 3,069,356
9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,069,356
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 3.1%(1)
12.	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) PN

(1)	Calculations are based upon 98,187,608 shares of Common Stock of the Issuer outstanding as of November 8, 2019, as set forth in the Form 10-Q of the Issuer filed with the U.S. Securities and Exchange Commission on November 14, 2019.

CUSIP No. 88025T102				13G	Page 10 of 24 Pages

1.	NAMES OF REPORTING PERSONS Insight Venture Partners Growth-Buyout Coinvestment Fund (Delaware), L.P.
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☐
3.	SEC USE ONLY
4.	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5.	SOLE VOTING POWER 0
		6.	SHARED VOTING POWER 2,822,284
		7.	SOLE DISPOSITIVE POWER 0
		8.	SHARED DISPOSITIVE POWER 2,822,284
9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,822,284
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 2.9%(1)
12.	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) PN

(1)	Calculations are based upon 98,187,608 shares of Common Stock of the Issuer outstanding as of November 8, 2019, as set forth in the Form 10-Q of the Issuer filed with the U.S. Securities and Exchange Commission on November 14, 2019.

CUSIP No. 88025T102				13G	Page 11 of 24 Pages

1.	NAMES OF REPORTING PERSONS Insight Venture Partners Growth-Buyout Coinvestment Fund (B), L.P.
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☐
3.	SEC USE ONLY
4.	CITIZENSHIP OR PLACE OF ORGANIZATION Cayman Islands
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5.	SOLE VOTING POWER 0
		6.	SHARED VOTING POWER 3,473,579
		7.	SOLE DISPOSITIVE POWER 0
		8.	SHARED DISPOSITIVE POWER 3,473,579
9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,473,579
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 3.5%(1)
12.	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) PN

(1)	Calculations are based upon 98,187,608 shares of Common Stock of the Issuer outstanding as of November 8, 2019, as set forth in the Form 10-Q of the Issuer filed with the U.S. Securities and Exchange Commission on November 14, 2019.

CUSIP No. 88025T102				13G	Page 12 of 24 Pages

1.	NAMES OF REPORTING PERSONS Insight Venture Associates Growth-Buyout Coinvestment, L.P.
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☐
3.	SEC USE ONLY
4.	CITIZENSHIP OR PLACE OF ORGANIZATION Cayman Islands
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5.	SOLE VOTING POWER 0
		6.	SHARED VOTING POWER 13,183,104
		7.	SOLE DISPOSITIVE POWER 0
		8.	SHARED DISPOSITIVE POWER 13,183,104
9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 13,183,104
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 13.4%(1)
12.	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) PN

(1)	Calculations are based upon 98,187,608 shares of Common Stock of the Issuer outstanding as of November 8, 2019, as set forth in the Form 10-Q of the Issuer filed with the U.S. Securities and Exchange Commission on November 14, 2019.

CUSIP No. 88025T102				13G	Page 13 of 24 Pages

1.	NAMES OF REPORTING PERSONS Insight Venture Associates Growth-Buyout Coinvestment Ltd.
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☐
3.	SEC USE ONLY
4.	CITIZENSHIP OR PLACE OF ORGANIZATION Cayman Islands
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5.	SOLE VOTING POWER 0
		6.	SHARED VOTING POWER 13,183,104
		7.	SOLE DISPOSITIVE POWER 0
		8.	SHARED DISPOSITIVE POWER 13,183,104
9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 13,183,104
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 13.4%(1)
12.	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) CO

(1)	Calculations are based upon 98,187,608 shares of Common Stock of the Issuer outstanding as of November 8, 2019, as set forth in the Form 10-Q of the Issuer filed with the U.S. Securities and Exchange Commission on November 14, 2019.

CUSIP No. 88025T102				13G	Page 14 of 24 Pages

1.	NAMES OF REPORTING PERSONS IVP (Venice), L.P.
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☐
3.	SEC USE ONLY
4.	CITIZENSHIP OR PLACE OF ORGANIZATION Cayman Islands
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5.	SOLE VOTING POWER 0
		6.	SHARED VOTING POWER 25,699
		7.	SOLE DISPOSITIVE POWER 0
		8.	SHARED DISPOSITIVE POWER 25,699
9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 25,699
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.0%(1)
12.	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) PN

(1)	Calculations are based upon 98,187,608 shares of Common Stock of the Issuer outstanding as of November 8, 2019, as set forth in the Form 10-Q of the Issuer filed with the U.S. Securities and Exchange Commission on November 14, 2019.

CUSIP No. 88025T102				13G	Page 15 of 24 Pages

1.	NAMES OF REPORTING PERSONS IVP GP (Venice), LLC
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☐
3.	SEC USE ONLY
4.	CITIZENSHIP OR PLACE OF ORGANIZATION Cayman Islands
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5.	SOLE VOTING POWER 0
		6.	SHARED VOTING POWER 25,699
		7.	SOLE DISPOSITIVE POWER 0
		8.	SHARED DISPOSITIVE POWER 25,699
9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 25,699
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.0%(1)
12.	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) OO

(1)	Calculations are based upon 98,187,608 shares of Common Stock of the Issuer outstanding as of November 8, 2019, as set forth in the Form 10-Q of the Issuer filed with the U.S. Securities and Exchange Commission on November 14, 2019.

CUSIP No. 88025T102				13G	Page 16 of 24 Pages

1.	NAMES OF REPORTING PERSONS Insight Venture Associates X, Ltd.
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☐
3.	SEC USE ONLY
4.	CITIZENSHIP OR PLACE OF ORGANIZATION Cayman Islands
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5.	SOLE VOTING POWER 0
		6.	SHARED VOTING POWER 25,699
		7.	SOLE DISPOSITIVE POWER 0
		8.	SHARED DISPOSITIVE POWER 25,699
9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 25,699
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.0%(1)
12.	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) CO

(1)	Calculations are based upon 98,187,608 shares of Common Stock of the Issuer outstanding as of November 8, 2019, as set forth in the Form 10-Q of the Issuer filed with the U.S. Securities and Exchange Commission on November 14, 2019.

CUSIP No. 88025T102				13G	Page 17 of 24 Pages

1.	NAMES OF REPORTING PERSONS Insight Holdings Group, LLC
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☐
3.	SEC USE ONLY
4.	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5.	SOLE VOTING POWER 0
		6.	SHARED VOTING POWER 26,390,576
		7.	SOLE DISPOSITIVE POWER 0
		8.	SHARED DISPOSITIVE POWER 26,390,576
9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 26,390,576
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 26.9%(1)
12.	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) OO

(1)	Calculations are based upon 98,187,608 shares of Common Stock of the Issuer outstanding as of November 8, 2019, as set forth in the Form 10-Q of the Issuer filed with the U.S. Securities and Exchange Commission on November 14, 2019.

Item 1(a).

Name of Issuer:

Tenable Holdings, Inc. (the “Issuer”)

Item 1(b).

Address of Issuer’s Principal Executive Offices:

7021 Columbia Gateway Drive, Suite 500 Columbia, Maryland, 21046

Item 2(a).

Name of Person Filing:

This Statement is being filed by the following persons (each a “Reporting Person” and, collectively, the “Reporting Persons”): (i) Insight Venture Partners IX, L.P., a Cayman Islands exempted limited partnership (“IVP IX”), (ii) Insight Venture Partners (Cayman) IX, L.P., a Cayman Islands exempted limited partnership (“IVP Cayman IX”), (iii) Insight Venture Partners (Delaware) IX, L.P., a Delaware limited partnership (“IVP Delaware IX”), (iv) Insight Venture Partners IX (Co-Investors), L.P., a Cayman Islands exempted limited partnership (“IVP Co-Investors IX” and, together with IVP IX, IVP Cayman IX and IVP Delaware IX, the “IVP IX Funds”), (v) Insight Venture Associates IX, L.P., a Cayman Islands exempted limited partnership (“IVA IX”), (vi) Insight Venture Associates IX, Ltd., a Cayman Islands exempted company (“IVA IX Ltd”), (vii) Insight Venture Partners Growth-Buyout Coinvestment Fund, L.P., a Cayman Islands exempted limited partnership (“IVP Coinvestment”), (viii) Insight Venture Partners Growth-Buyout Coinvestment Fund (Cayman), L.P., a Cayman Islands exempted limited partnership (“IVP Coinvestment (Cayman)”), (ix) Insight Venture Partners Growth-Buyout Coinvestment Fund (Delaware), L.P., a Delaware limited partnership (“IVP Coinvestment (Delaware)”), (x) Insight Venture Partners Growth-Buyout Coinvestment Fund (B), L.P., a Cayman Islands exempted limited partnership (“IVP Coinvestment (B)” and, together with IVP Coinvestment, IVP Coinvestment (Cayman) and IVP Coinvestment (Delaware), the “IVP Coinvestment Funds”), (xi) Insight Venture Associates Growth-Buyout Coinvestment, L.P., a Cayman Islands exempted limited partnership (“IVA Coinvestment”), (xii) Insight Venture Associates Growth-Buyout Coinvestment Ltd., a Cayman Islands exempted company (“IVA Coinvestment Ltd”), (xiii) IVP (Venice), L.P., a Cayman Islands exempted limited partnership (“IVP Venice”), (xiv) IVP GP (Venice), LLC, a Cayman Islands limited liability company (“IVP GP Venice”), (xv) Insight Venture Associates X, Ltd., a Cayman Islands exempted company (“IVA X”), and (xvi) Insight Holdings Group, LLC, a Delaware limited liability company (“Holdings”).

The general partner of each of the IVP IX Funds is IVA IX, whose general partner is IVA IX Ltd. The general partner of each of the IVP Coinvestment Funds is IVA Coinvestment, whose general partner is IVA Coinvestment Ltd. The sole shareholder of IVA IX Ltd and IVA Coinvestment Ltd is Holdings. The amount listed as owned by IVP Venice may be deemed attributable to Holdings because Holdings is the sole shareholder of IVA X, which is the general partner of IVP GP Venice, which in turn is the manager of IVP Venice.

Item 2(b).

Address of Principal Business Office or, if None, Residence:

The address of the principal business and principal office of each of the Reporting Persons is c/o Insight Venture Partners, 1114 Avenue of the Americas, 36th Floor, New York, New York 10036.

Item 2(c).

Citizenship:

See Item 2(a).

Item 2(d).

Title of Class of Securities:

Common Stock, par value $0.01 per share (“Common Stock”)

Item 2(e).

CUSIP Number:

88025T102

Item 3.

If this statement is filed pursuant to Rule 13d-1(b) or Rule 13d-2(b) or (c), check whether the person filing is a:

(a) ◻

Broker or dealer registered under Section 15 of the Exchange Act.

(b) ◻

Bank as defined in Section 3(a)(6) of the Exchange Act.

Insurance company as defined in Section 3(a)(19) of the Exchange Act.

(d) ◻

Investment company registered under Section 8 of the Investment Company Act.

(e) ◻

An investment adviser in accordance with Rule 13d-1(b)(1)(ii)(E);

(f) ◻

An employee benefit plan or endowment fund in accordance with Rule 13d-1(b)(1)(ii)(F);

(g) ◻

A parent holding company or control person in accordance with Rule 13d-1(b)(1)(ii)(G);

(h) ◻

A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act;

	(i) ◻	A church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act;

	(j) ◻	Group, in accordance with Rule 13d-1(b)(1)(ii)(J).

Not applicable.

Item 4.

Ownership.

The information required by Items 4(a)-(c) is set forth in Rows 5-11 of the cover pages hereto for each Reporting Person and is incorporated herein by reference for each such Reporting Person.

Item 5.

Ownership of Five Percent or Less of a Class.

Not applicable.

Item 6.

Ownership of More than Five Percent on Behalf of Another Person.

As the general partner of the Insight IVP IX Funds, IVA IX may be deemed to beneficially own all 13,181,773 shares of Common Stock held directly by the IVP IX Funds. As the general partner of IVA IX, IVA IX Ltd may be deemed to beneficially own all 13,181,773 shares of Common Stock held directly by the IVP IX Funds. As the general partner of each of the IVP Coinvestment Funds, IVA Coinvestment may be deemed to beneficially own all 13,183,104 shares of Common Stock held directly by the IVP Coinvestment Funds. As the general partner of IVA Coinvestment, IVA Coinvestment Ltd may be deemed to beneficially own all 13,183,104 shares of Common Stock held directly by the IVP Coinvestment Funds. As the sole shareholder of IVA IX Ltd and IVA Coinvestment Ltd., Holdings may be deemed to beneficially own all 13,181,773 shares of Common Stock held directly by the IVP IX Funds and all 13,183,104 shares of Common Stock held directly by the IVP Coinvestment Funds. The amount listed as owned by IVP Venice may be deemed attributable to Holdings because Holdings is the sole shareholder of IVA X, which is the general partner of IVP GP Venice, which in turn is the manager of IVP Venice. The foregoing is not an admission by IVA IX, IVA IX Ltd, IVA Coinvestment, IVA Coinvestment Ltd, IVP GP Venice, IVA X or Holdings that it is the beneficial owner of the shares held of record by the IVP IX Funds, the IVP Coinvestment Funds or IVP Venice, nor is it an admission by any of IVP IX Funds, the IVP Coinvestment Funds or IVP Venice that it is the beneficial owner of any shares of Common Stock held by the other of the IVP IX Funds, the IVP Coinvestment Funds or IVP Venice.

Item 7.

Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company.

Not applicable.

Item 8.

Identification and Classification of Members of the Group.

The Reporting Persons are making this single, joint filing because they may be deemed to constitute a “group” within the meaning of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). The agreement among the Reporting Persons to file jointly in accordance with Rule 13d-1(k) of the Exchange Act is attached hereto as Exhibit 99.1. The Reporting Persons disclaim membership in a group and this report shall not be deemed an admission by any of the Reporting Persons that they are or may be members of a “group” for purposes of Rule 13d-5 or for any other purpose.

Item 9.

Notice of Dissolution of Group.

Not applicable.

Item 10.

Certification.

Not applicable.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Date: February 12, 2020

	INSIGHT HOLDINGS GROUP, LLC


	By:	/s/ Blair Flicker
	Name:	Blair Flicker
	Title:	Attorney-in-Fact


	INSIGHT VENTURE PARTNERS IX, L.P.
	By:	Insight Venture Associates IX, L.P., its general partner
	By:	Insight Venture Associates IX, Ltd., its general partner


	By:	/s/ Blair Flicker
	Name:	Blair Flicker
	Title:	Authorized Officer


	INSIGHT VENTURE PARTNERS (CAYMAN) IX, L.P.
	By:	Insight Venture Associates IX, L.P., its general partner
	By:	Insight Venture Associates IX, Ltd., its general partner


	By:	/s/ Blair Flicker
	Name:	Blair Flicker
	Title:	Authorized Officer


	INSIGHT VENTURE PARTNERS (DELAWARE) IX, L.P.
	By:	Insight Venture Associates IX, L.P., its general partner
	By:	Insight Venture Associates IX, Ltd., its general partner


	By:	/s/ Blair Flicker
	Name:	Blair Flicker
	Title:	Authorized Officer


	INSIGHT VENTURE PARTNERS IX (CO-INVESTORS), L.P.
	By:	Insight Venture Associates IX, L.P., its general partner
	By:	Insight Venture Associates IX, Ltd., its general partner


	By:	/s/ Blair Flicker
	Name:	Blair Flicker
	Title:	Authorized Officer

[Signature Page to Schedule 13G]

	INSIGHT VENTURE ASSOCIATES IX, L.P.
	By:	Insight Venture Associates IX, Ltd., its general partner


	By:	/s/ Blair Flicker
	Name:	Blair Flicker
	Title:	Authorized Officer


	INSIGHT VENTURE ASSOCIATES IX, LTD.


	By:	/s/ Blair Flicker
	Name:	Blair Flicker
	Title:	Authorized Officer


	INSIGHT VENTURE PARTNERS GROWTH-BUYOUT COINVESTMENT FUND, L.P.
	By:	Insight Venture Associates Growth-Buyout Coinvestment, L.P., its general partner
	By:	Insight Venture Associates Growth-Buyout Coinvestment, Ltd., its general partner


	By:	/s/ Blair Flicker
	Name:	Blair Flicker
	Title:	Authorized Officer


	INSIGHT VENTURE PARTNERS GROWTH-BUYOUT COINVESTMENT FUND (CAYMAN), L.P.
	By:	Insight Venture Associates Growth-Buyout Coinvestment, L.P., its general partner
	By:	Insight Venture Associates Growth-Buyout Coinvestment, Ltd., its general partner


	By:	/s/ Blair Flicker
	Name:	Blair Flicker
	Title:	Authorized Officer


	INSIGHT VENTURE PARTNERS GROWTH-BUYOUT COINVESTMENT FUND (DELAWARE), L.P.
	By:	Insight Venture Associates Growth-Buyout Coinvestment, L.P., its general partner
	By:	Insight Venture Associates Growth-Buyout Coinvestment, Ltd., its general partner


	By:	/s/ Blair Flicker
	Name:	Blair Flicker
	Title:	Authorized Officer


	INSIGHT VENTURE PARTNERS GROWTH-BUYOUT COINVESTMENT FUND (B), L.P.
	By:	Insight Venture Associates Growth-Buyout Coinvestment, L.P., its general partner
	By:	Insight Venture Associates Growth-Buyout Coinvestment, Ltd., its general partner


	By:	/s/ Blair Flicker
	Name:	Blair Flicker
	Title:	Authorized Officer

[Signature Page to Schedule 13G]

	INSIGHT VENTURE ASSOCIATES GROWTH-BUYOUT COINVESTMENT, L.P.
	By:	Insight Venture Associates Growth-Buyout Coinvestment, Ltd., its general partner


	By:	/s/ Blair Flicker
	Name:	Blair Flicker
	Title:	Authorized Officer


	INSIGHT VENTURE ASSOCIATES GROWTH-BUYOUT COINVESTMENT, LTD.


	By:	/s/ Blair Flicker
	Name:	Blair Flicker
	Title:	Authorized Officer


	IVP (VENICE), L.P.


	By:	/s/ Blair Flicker
	Name:	Blair Flicker
	Title:	Authorized Officer



	IVP GP (VENICE), LLC


	By:	/s/ Blair Flicker
	Name:	Blair Flicker
	Title:	Authorized Officer


	INSIGHT VENTURE ASSOCIATES X, LTD.


	By:	/s/ Blair Flicker
	Name:	Blair Flicker
	Title:	Authorized Officer

[Signature Page to Schedule 13G]

EXHIBIT INDEX


Exhibit 99.1		Joint Filing Agreement, as required by Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended

Tenable (TENB) SC 13G/ABeneficial ownership report (amended)