Tenable Holdings, Inc.
US ˙ NasdaqGS ˙ US88025T1025

SecurityTENB / Tenable Holdings, Inc.
InstitutionSei Investments Co
Latest Disclosed Ownership101,416 shares
Latest Disclosed Value $ 2,386,319
Sei Investments Co reports 11.07% decrease in ownership of TENB / Tenable Holdings, Inc.

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 101,416 shares of Tenable Holdings, Inc. (US:TENB) valued at $2,386,318 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 114,038 shares of Tenable Holdings, Inc.. This represents a change in shares of -11.07% during the quarter. The current value of the position is $2,824,436 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-02-13 2025-12-31 13F TENABLE HLDGS COM 88025T102 101,416 -12,622 -11.07 2,386 -28.24 0.0024
2025-11-13 2025-09-30 13F TENABLE HLDGS COM 88025T102 114,038 60,343 112.38 3,325 83.40 0.0036
2025-08-14 2025-06-30 13F TENABLE HLDGS COM 88025T102 53,695 19,169 55.52 1,814 50.21 0.0021
2025-05-14 2025-03-31 13F/A-1 TENABLE HLDGS COM 88025T102 34,526 10,156 41.67 1,208 25.86 0.0016
2025-05-13 2025-03-31 13F TENABLE HLDGS COM 88025T102 24,541 171 962 0.0010
2025-02-11 2024-12-31 13F TENABLE HLDGS COM 88025T102 24,370 91 0.37 960 -2.44 0.0012
2024-11-12 2024-09-30 13F TENABLE HLDGS COM 88025T102 24,279 -1,129 -4.44 984 -11.20 0.0013
2024-08-13 2024-06-30 13F TENABLE HLDGS COM 88025T102 25,408 7,884 44.99 1,107 27.83 0.0016
2024-05-07 2024-03-31 13F TENABLE HLDGS COM 88025T102 17,524 -9,319 -34.72 866 -29.94 0.0013
2024-02-14 2023-12-31 13F TENABLE HLDGS COM 88025T102 26,843 -9,417 -25.97 1,236 -23.89 0.0020
2023-11-14 2023-09-30 13F TENABLE HLDGS COM 88025T102 36,260 -7,875 -17.84 1,624 -15.50 0.0029
2023-08-11 2023-06-30 13F TENABLE HLDGS COM 88025T102 44,135 1,996 4.74 1,922 -4.00 0.0034
2023-05-12 2023-03-31 13F TENABLE HLDGS COM 88025T102 42,139 15,309 57.06 2,002 95.70 0.0037
2023-02-10 2022-12-31 13F TENABLE HLDGS COM 88025T102 26,830 3,003 12.60 1,024 23.25 0.0023
2022-11-14 2022-09-30 13F TENABLE HLDGS COM 88025T102 23,827 -19,870 -45.47 830 -58.04 0.0019
2022-08-15 2022-06-30 13F TENABLE HLDGS COM 88025T102 43,697 32,288 283.00 1,978 200.15 0.0043
2022-05-13 2022-03-31 13F TENABLE HLDGS COM 88025T102 11,409 11,409 659 0.0013
2021-08-06 2021-06-30 13F TENABLE HLDGS COM 88025T102 0 -16,831 -100.00 0 -100.00
2021-05-12 2021-03-31 13F TENABLE HLDGS COM 88025T102 16,831 -9,821 -36.85 609 -56.28 0.0015
2021-02-08 2020-12-31 13F TENABLE HLDGS COM 88025T102 26,652 -37,581 -58.51 1,393 -42.56 0.0036
2020-12-04 2020-09-30 13F/A-1 TENABLE HLDGS COM 88025T102 64,233 64,233 2,425 0.0070
2020-11-06 2020-09-30 13F TENABLE HLDGS COM 88025T102 64,233 64,233 2,425 5,838.8608
2020-08-17 2020-06-30 13F/A-1 TENABLE HLDGS COM 88025T102 0 -21,901 -100.00 0 -100.00
2020-05-14 2020-03-31 13F TENABLE HLDGS COM 88025T102 21,901 -11,123 -33.68 479 -39.44 0.0018
2020-02-06 2019-12-31 13F TENABLE HLDGS COM 88025T102 33,024 17,511 112.88 791 127.95 0.0024
2019-11-12 2019-09-30 13F TENABLE HLDGS COM 88025T102 15,513 2,848 22.49 347 -3.88 0.0009
2019-08-14 2019-06-30 13F TENABLE HLDGS COM 88025T102 12,665 12,665 361 0.0012
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.