XOOMAR

Tenable Holdings (TENB)

Tenable Holdings on one page: short interest, daily short volume, fails to deliver, planned sales, large holders, 13F holders, financials, earnings dates and insider trades. Listed on Nasdaq, classified by the SEC as services-prepackaged software.

Download CSV

15.6M

Short interest

settlement 2026-09-30

4.5

Days to cover

+1.4 days vs prior

46.8%

Short share of volume

2026-10-09

28,908

Fails to deliver

settlement 2026-09-14

Wed 28 Oct

Next earnings

estimated date

-$207K

Insider flow, 90 days

0 buys, 6 sells

As of 2026-10-09.

Short interest

FINRA, twice a month. The newest 24 settlements in the table, 48 in the chart. JSON

As of 30 September 2026, short interest in TENB is 15,633,932 shares, up 450,314 shares over the last month. Over the last 48 readings it ranged from 3,472,436 shares (13 December 2024) to 18,181,258 shares (15 September 2026). At the reported average volume of 3.5M shares a day that is 4.5 days to cover.

Embed this chart.The embed keeps its attribution line.
<iframe src="https://xoomar.com/embed/stocks/tenb" width="100%" height="440" style="border:0;max-width:100%" loading="lazy" title="XOOMAR chart"></iframe>
PreviewDark previewAdd ?theme=dark to the src for a dark chart.
SettlementShares shortChangeAvg daily volumeDays to cover
2026-09-3015,633,932-14.0%3,495,6994.47
2026-09-1518,181,258+19.7%6,010,1623.03
2026-08-3115,183,618+44.6%4,604,8733.30
2026-08-1410,500,225+3.0%2,891,0253.63
2026-07-3110,193,657-4.1%3,807,2992.68
2026-07-1510,628,539-4.3%3,840,6852.77
2026-06-3011,100,510-3.6%3,438,5833.23
2026-06-1511,519,977-5.0%3,414,3633.37
2026-05-2912,130,763-22.2%4,230,8382.87
2026-05-1515,586,136+9.7%3,130,0264.98
2026-04-3014,208,246-13.3%3,492,1534.07
2026-04-1516,389,959+11.4%3,581,4164.58
2026-03-3114,707,099+56.6%3,098,1574.75
2026-03-139,391,464+37.3%2,292,7734.10
2026-02-276,838,523+14.9%2,945,5032.32
2026-02-135,952,389-12.1%4,218,9811.41
2026-01-306,773,714+22.4%1,889,7343.58
2026-01-155,532,222+11.7%1,517,5833.65
2025-12-314,953,821-6.1%1,620,3543.06
2025-12-155,275,479-6.7%1,299,3774.06
2025-11-285,652,403+4.1%1,010,7395.59
2025-11-145,432,073+4.6%1,174,1424.63
2025-10-315,193,490+0.3%1,242,1964.18
2025-10-155,178,544+5.4%1,198,3164.32

Daily short volume

FINRA Reg SHO, the last 30 sessions. JSON

As of 9 October 2026, the short share of TENB volume is 46.8%, down 2.7 points over the last five sessions. Over the last 30 readings it ranged from 46.8% (9 October 2026) to 82.3% (9 September 2026). The latest reading sits at the bottom of that range. The latest reading is 19.6 points below the 30-session average of 66.5%, on 2.9M shares reported.

DateShort volumeTotal volumeShort shareExempt
2026-10-091.3M2.9M46.8%1
2026-10-081.0M1.6M65.1%400
2026-10-07977K1.5M66.8%13
2026-10-06858K1.6M54.4%200
2026-10-051.0M1.5M69.8%77
2026-10-02358K723K49.5%137
2026-10-01609K1.1M56.3%1,268
2026-09-301.1M2.2M48.6%136
2026-09-29581K861K67.5%62
2026-09-281.5M1.8M79.4%134
2026-09-25579K971K59.7%2
2026-09-24370K626K59.0%0
2026-09-23720K1.1M64.9%2
2026-09-22639K1.3M50.3%206
2026-09-21761K1.1M69.2%349
2026-09-181.5M1.8M80.6%327
2026-09-171.1M1.6M67.8%9
2026-09-162.4M3.0M79.9%1,545
2026-09-152.2M3.4M63.2%21,015
2026-09-143.8M6.5M57.5%54,886
2026-09-115.3M6.9M76.5%1,668
2026-09-101.2M1.7M74.8%1,418
2026-09-092.0M2.4M82.3%0
2026-09-08961K1.3M75.9%110
2026-09-04481K613K78.4%18
2026-09-03775K1.1M71.5%500
2026-09-021.1M1.5M74.1%1,000
2026-09-01884K1.2M71.7%255
2026-08-31696K1.1M64.7%18
2026-08-283.1M4.6M67.3%1,270

Fails to deliver

SEC, the last 30 settlement dates with a fail. JSON

As of 14 September 2026, the fails-to-deliver balance in TENB is 28,908 shares, up 14,881 shares over the last settlement date. Over the last 30 readings it ranged from 6 shares (13 July 2026) to 78,000 shares (6 August 2026).

SettlementShares failedPriceValue
2026-09-1428,908$30.11$870K
2026-09-1114,027$32.03$449K
2026-09-1018,626$33.67$627K
2026-09-0424,062$34.49$830K
2026-09-039,943$34.24$340K
2026-09-02234$35.47$8K
2026-08-3172$37.67$3K
2026-08-2581$33.94$3K
2026-08-241,120$34.38$39K
2026-08-2034,100$35.28$1.2M
2026-08-1314,106$37.00$522K
2026-08-10186$36.38$7K
2026-08-0714,191$36.17$513K
2026-08-0678,000$36.00$2.8M
2026-07-232,989$32.83$98K
2026-07-204,971$39.88$198K
2026-07-176,610$39.77$263K
2026-07-136$39.78$239
2026-07-1045$41.37$2K
2026-07-01538$36.88$20K
2026-06-2416,681$27.26$455K
2026-06-181,107$26.88$30K
2026-06-15133$26.80$4K
2026-05-285,822$24.45$142K
2026-05-275,584$25.82$144K
2026-05-26830$25.45$21K
2026-05-22609$25.17$15K
2026-05-196,092$23.12$141K
2026-04-3039$21.47$837
2026-04-291,875$20.44$38K

Insider trades

SEC Form 4, newest first, 50 of 100 shown. JSON

Insiders at TENB reported 6 open-market sells worth $207K in the last 90 days and no open-market buys. Latest filing: Thurmond Mark C. (Co-Chief Executive Officer) on 2026-08-24.

DateInsiderTitleTypeSharesPriceValueOwned after
2026-08-24Thurmond Mark C.Co-Chief Executive OfficerTax withholding2K$33.94$72K195K
2026-08-24Thurmond Mark C.Co-Chief Executive OfficerOption exercise4K$0.00$0197K
2026-08-24Thurmond Mark C.Co-Chief Executive OfficerTax withholding4K$33.94$127K193K
2026-08-24Thurmond Mark C.Co-Chief Executive OfficerOption exercise8K$0.00$0197K
2026-08-24Thurmond Mark C.Co-Chief Executive OfficerTax withholding2K$33.94$61K189K
2026-08-24Thurmond Mark C.Co-Chief Executive OfficerOption exercise4K$0.00$0191K
2026-08-24Thurmond Mark C.Co-Chief Executive OfficerTax withholding3K$33.94$100K187K
2026-08-24Thurmond Mark C.Co-Chief Executive OfficerOption exercise6K$0.00$0190K
2026-08-24Thurmond Mark C.Co-Chief Executive OfficerTax withholding1K$33.94$37K184K
2026-08-24Thurmond Mark C.Co-Chief Executive OfficerOption exercise2K$0.00$0185K
2026-08-24Thurmond Mark C.Co-Chief Executive OfficerTax withholding562$33.94$19K183K
2026-08-24Thurmond Mark C.Co-Chief Executive OfficerOption exercise1K$0.00$0183K
2026-08-24Vintz Stephen ACo-Chief Executive OfficerTax withholding2K$33.94$73K625K
2026-08-24Vintz Stephen ACo-Chief Executive OfficerOption exercise5K$0.00$0627K
2026-08-24Vintz Stephen ACo-Chief Executive OfficerTax withholding4K$33.94$126K622K
2026-08-24Vintz Stephen ACo-Chief Executive OfficerOption exercise8K$0.00$0626K
2026-08-24Vintz Stephen ACo-Chief Executive OfficerTax withholding2K$33.94$83K618K
2026-08-24Vintz Stephen ACo-Chief Executive OfficerOption exercise5K$0.00$0621K
2026-08-24Vintz Stephen ACo-Chief Executive OfficerTax withholding3K$33.94$99K616K
2026-08-24Vintz Stephen ACo-Chief Executive OfficerOption exercise6K$0.00$0619K
2026-08-24Vintz Stephen ACo-Chief Executive OfficerTax withholding1K$33.94$38K613K
2026-08-24Vintz Stephen ACo-Chief Executive OfficerOption exercise2K$0.00$0614K
2026-08-24Vintz Stephen ACo-Chief Executive OfficerTax withholding764$33.94$26K611K
2026-08-24Vintz Stephen ACo-Chief Executive OfficerOption exercise2K$0.00$0612K
2026-08-24Anschutz BarronChief Accounting OfficerTax withholding780$33.94$26K76K
2026-08-24Anschutz BarronChief Accounting OfficerOption exercise2K$0.00$077K
2026-08-24Anschutz BarronChief Accounting OfficerTax withholding602$33.94$20K75K
2026-08-24Anschutz BarronChief Accounting OfficerOption exercise1K$0.00$076K
2026-08-24Anschutz BarronChief Accounting OfficerTax withholding640$33.94$22K75K
2026-08-24Anschutz BarronChief Accounting OfficerOption exercise1K$0.00$075K
2026-08-21Brown Matthew CharlesChief Financial OfficerTax withholding7K$34.38$254K47K
2026-08-21Brown Matthew CharlesChief Financial OfficerOption exercise15K$0.00$054K
2026-08-19Zecher Linda KayDirectorSell690$35.76$25K7K
2026-08-18Zecher Linda KayDirectorSell700$35.46$25K8K
2026-08-07Vicks Raymond Jr.DirectorSell2K$35.94$65K21K
2026-08-07Zecher Linda KayDirectorSell550$36.50$20K8K
2026-08-05Vintz Stephen ACo-Chief Executive OfficerTax withholding301K$36.48$11.0M611K
2026-08-05Vintz Stephen ACo-Chief Executive OfficerOption exercise423K$16.21$6.9M911K
2026-08-04Zecher Linda KayDirectorSell600$36.00$22K9K
2026-08-03Zecher Linda KayDirectorSell1K$34.00$50K10K
2026-06-15KEANE MARGARET MDirectorOption exercise3K$0.00$020K
2026-05-22Thurmond Mark C.Co-Chief Executive OfficerTax withholding2K$25.45$54K182K
2026-05-22Thurmond Mark C.Co-Chief Executive OfficerOption exercise4K$0.00$0184K
2026-05-22Thurmond Mark C.Co-Chief Executive OfficerTax withholding4K$25.45$96K180K
2026-05-22Thurmond Mark C.Co-Chief Executive OfficerOption exercise8K$0.00$0184K
2026-05-22Thurmond Mark C.Co-Chief Executive OfficerTax withholding2K$25.45$46K176K
2026-05-22Thurmond Mark C.Co-Chief Executive OfficerOption exercise4K$0.00$0178K
2026-05-22Thurmond Mark C.Co-Chief Executive OfficerTax withholding3K$25.45$75K174K
2026-05-22Thurmond Mark C.Co-Chief Executive OfficerOption exercise6K$0.00$0177K
2026-05-22Thurmond Mark C.Co-Chief Executive OfficerTax withholding1K$25.45$28K171K

Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are rarer.

Planned sales (Form 144)

Newest first. JSON

3 Form 144 notices on file for TENB worth $2.9M at the prices reported; 1 in the last 90 days worth $65K. Latest: Vicks Raymond Jr. filed on 2026-08-07 to sell 1,819 shares ($65K) from 2026-08-07.

FiledSellerSharesMarket valueOf outstandingSale fromBroker
2026-08-07Vicks Raymond Jr.Director2K$65K0.002%2026-08-07Fidelity Brokerage Services LLC
2025-12-15SEAWELL A BROOKEDirector115K$2.9M0.096%2025-12-15Fidelity Brokerage Services LLC
2025-10-17Anschutz BarronOfficer976$28K0.001%2025-10-17Fidelity Brokerage Services LLC

Large holders (13D and 13G)

One row per reporting person with its latest filing, newest first. JSON

6 holders report 5% or more of TENB in their latest filing, all on Schedule 13G (passive). The largest reported stake is BlackRock, Inc. at 17.5% of the class (19,326,921 shares), filed 2026-09-04 for an event on 2026-08-31.

FiledFormHolderSharesOf classEvent
2026-09-0413G/Ano. 1Vanguard Portfolio Managementinvestment adviser11.2M10.2%2026-08-31
2026-09-0413G/Ano. 3BlackRock, Inc.parent holding company19.3M17.5%2026-08-31
2026-06-0513G/Ano. 2Ameriprise Financial, Inc.parent holding company15.1M13.7%2026-05-31
2026-06-0513G/Ano. 2Columbia Management Investment Advisers, LLCinvestment adviser14.1M12.7%2026-05-31
2026-06-0513G/Ano. 2Columbia Seligman Technology and Information Fundinvestment company8.9M8.1%2026-05-31
2026-04-3013GVanguard Capital Managementinvestment adviser6.3M5.4%2026-03-31
2026-03-2713G/Ano. 5The Vanguard Groupinvestment adviser00.0%2026-03-13

13F holders

Tracked managers holding TENB at their latest 13F. JSON

7 of the 30 tracked managers held TENB at their latest 13F, $199.8M in total at quarter-end prices. AQR Capital Management is the largest at $66.3M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 3 added shares and 4 cut.

FundQuarterSharesValueOf portfolioChange in shares
AQR Capital Management2026-06-301.8M$66.3M0.02%+214K
Millennium Management2026-06-30973K$35.9M0.01%+400K
Renaissance Technologies2026-06-30971K$35.8M0.05%-289K
Two Sigma Investments2026-06-30597K$22.0M0.02%-657K
Point72 Asset Management2026-06-30568K$20.9M0.02%+459K
Citadel Advisors2026-06-30461K$17.0M0.00%-291K
D. E. Shaw & Co.2026-06-3051K$1.9M0.00%-234K

Only the 30 tracked managers on the funds hub; a 13F reports long positions in US listed stock at quarter end, 45 days late, and says nothing about shorts or positions sold since.

Financials

SEC XBRL, as filed. JSON

In Q2 FY 2026 (quarter ended 2026-06-30) Tenable Holdings reported revenue of $268.5M, up 8.6% from the same quarter a year earlier, and net income of $3.8M (0.03 diluted EPS). In FY 2025 it generated $266.8M of operating cash flow and spent $247.5M on buybacks.

Cash
$125.4M
Equity
$198.4M
Total assets
$1.57B
Shares outstanding
110,139,983

Quarterly, last 8 quarters

QuarterPeriod endRevenueNet incomeMarginDiluted EPS
Q2 FY 20262026-06-30$268.5M$3.8M1.4%0.03
Q1 FY 20262026-03-31$262.1M$1.4M0.5%0.01
Q4 FY 2025derived2025-12-31$260.5M-$737K-0.3%n/a
Q3 FY 20252025-09-30$252.4M$2.3M0.9%0.02
Q2 FY 20252025-06-30$247.3M-$14.7M-5.9%-0.12
Q1 FY 20252025-03-31$239.1M-$22.9M-9.6%-0.19
Q4 FY 2024derived2024-12-31$235.7M$1.9M0.8%n/a
Q3 FY 20242024-09-30$227.1M-$9.2M-4.1%-0.08

Fiscal years, with buybacks and dividends

Fiscal yearEndsRevenueNet incomeOperating cash flowCapexBuybacksDividends
FY 20252025-12-31$999.4M-$36.1M$266.8M$12.1M$247.5Mn/a
FY 20242024-12-31$900.0M-$36.3M$217.5M$4.2M$100.0Mn/a
FY 20232023-12-31$798.7M-$78.3M$149.9M$1.7M$14.9Mn/a
FY 20222022-12-31$683.2M-$92.2M$131.2M$9.4M$0n/a
FY 20212021-12-31$541.1M-$46.7M$96.8M$3.9M$0n/a

Quarters are the three-month figures the company reports; a fourth quarter marked derived is the fiscal year less the three reported quarters, since companies report it only inside the 10-K. Fiscal years are the annual figures. Buybacks are the cash the company paid to repurchase its common stock in the year, not the amount authorized. Balance sheet lines are as of 2026-06-30; shares outstanding as of 2026-07-31 from the cover page.

What this page is

Tenable Holdings in the regulatory record

Regulators publish company data in separate files that never sit next to each other: FINRA's twice-monthly short interest, its daily short sale volume, the SEC's fails-to-deliver counts, and each insider's Form 4. A company page puts those series for one ticker on one URL, with planned sales, large holders, 13F holders and financials beside them, so the short position, the daily flow, the settlement fails and what insiders are doing can be read together.

Each section has its own history table, a one-line summary of the latest figures and its own JSON and CSV links, and says when its source last updated.

This page follows Tenable Holdings (TENB), SEC CIK 1660280, listed on Nasdaq, classified by the SEC as services-prepackaged software. The cross-market tables live on the short interest and insider transactions hubs.

Source and updates

Short interest
FINRA consolidated short interestSource: FINRA.Twice a month, about eight business days after settlement. Latest 2026-09-30.JSON and CSV
Daily short volume
FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-10-09.JSON and CSV
Fails to deliver
SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-09-14.JSON and CSV
Planned sales
SEC EDGAR Form 144Source: SEC.New notices appear shortly after the SEC posts them; a notice is filed on or before the sale. Latest 2026-08-07.JSON and CSV
Large holders
SEC EDGAR Schedule 13D and 13GSource: SEC.New filings appear shortly after the SEC posts them. A 13D is due within five business days of crossing 5%; a 13G follows the passive schedule. Latest 2026-09-04.JSON and CSV
13F holders
SEC EDGAR Form 13F-HRSource: SEC.Quarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
Financials
SEC EDGAR 10-K and 10-Q filingsSource: SEC.Weekly; values are as filed in the 10-Q and 10-K. Latest 2026-06-30.JSON and CSV
Earnings dates
SEC EDGAR 8-K filings (Item 2.02)Source: SEC.Twice a day. Reported dates come from the company's 8-K filings; the next date is marked as an estimate until the 8-K arrives. Latest 2026-07-29.JSON and CSV
Insider trades
SEC EDGAR Form 4Source: SEC.New filings appear shortly after the SEC posts them; they're due two business days after the trade. Latest 2026-08-24.JSON and CSV
Company record
EDGAR filing index for CIK 1660280Ticker, name and exchange from the SEC's company list, refreshed weekly.
Rate limits
10 requests a minute without a key, 30 with a free key from a free account.

How to read it

  • Read the position against the flow: rising short interest with a high daily short share is new shorting; rising short interest with a normal short share is old shorts holding on.
  • Insider buys next to a large short position are rare and stand out; insider sells next to one are common and mean little.
  • Fails to deliver matter relative to the float, not in absolute shares; a million failed shares in a mega cap is noise.

Analysis of what the data shows, not advice. XOOMAR does not recommend buying, selling or holding anything.

Datasets

Frequently Asked Questions

How much of TENB is sold short?
15,633,932 shares were held short at the 2026-09-30 settlement, 4.5 days of average volume. FINRA publishes the next count about eight business days after the 15th and the last business day of the month.
What is TENB's daily short volume?
On 2026-10-09, 1,347,412 of the 2,876,764 TENB shares reported to FINRA were sold short, 46.8% of the day's reported volume. Short volume is a flow for one day, not a position.
Does TENB have fails to deliver?
The SEC's latest file shows 28,908 TENB shares failed to deliver at settlement 2026-09-14. Fails are reported per settlement date and published twice a month with a lag.
Are TENB insiders buying or selling?
Insiders at TENB reported 6 open-market sells worth $207K in the last 90 days and no open-market buys. Latest filing: Thurmond Mark C. (Co-Chief Executive Officer) on 2026-08-24.
Have TENB insiders filed to sell?
3 Form 144 notices on file for TENB worth $2.9M at the prices reported; 1 in the last 90 days worth $65K. Latest: Vicks Raymond Jr. filed on 2026-08-07 to sell 1,819 shares ($65K) from 2026-08-07.
Who owns 5% or more of TENB?
6 holders report 5% or more of TENB in their latest filing, all on Schedule 13G (passive). The largest reported stake is BlackRock, Inc. at 17.5% of the class (19,326,921 shares), filed 2026-09-04 for an event on 2026-08-31.
What did TENB report last quarter?
In Q2 FY 2026 (quarter ended 2026-06-30) Tenable Holdings reported revenue of $268.5M, up 8.6% from the same quarter a year earlier, and net income of $3.8M (0.03 diluted EPS). In FY 2025 it generated $266.8M of operating cash flow and spent $247.5M on buybacks.
Which tracked 13F managers own TENB?
7 of the 30 tracked 13F managers held TENB shares at their latest filing, $199.8M in all. The largest: Cliff Asness's AQR Capital Management (1.8M shares, $66.3M), Izzy Englander's Millennium Management (973K shares, $35.9M), Renaissance Technologies (971K shares, $35.8M), Two Sigma Investments (597K shares, $22.0M), Steve Cohen's Point72 Asset Management (568K shares, $20.9M), Ken Griffin's Citadel Advisors (461K shares, $17.0M). The table above lists all 7.

Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.