Tenable Holdings, Inc.
US ˙ NasdaqGS ˙ US88025T1025

SecurityTENB / Tenable Holdings, Inc.
InstitutionDiversified Trust Co
Latest Disclosed Ownership28,288 shares
Latest Disclosed Value $ 478,491
Diversified Trust Co reports 231.79% increase in ownership of TENB / Tenable Holdings, Inc.

On April 16, 2026 - Diversified Trust Co filed a 13F-HR form disclosing ownership of 28,288 shares of Tenable Holdings, Inc. (US:TENB) valued at $478,492 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 9, 2026 disclosing 8,526 shares of Tenable Holdings, Inc.. This represents a change in shares of 231.79% during the quarter. The current value of the position is $839,871 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-04-16 2026-03-31 13F TENABLE HLDGS COM 88025T102 28,288 19,762 231.79 478 139.00 0.0059
2026-01-09 2025-12-31 13F TENABLE HLDGS COM 88025T102 8,526 -12,826 -60.07 201 -67.85 0.0037
2025-10-20 2025-09-30 13F TENABLE HLDGS COM 88025T102 21,352 -3,524 -14.17 623 -25.95 0.0124
2025-07-11 2025-06-30 13F TENABLE HLDGS COM 88025T102 24,876 -59 -0.24 840 -3.67 0.0186
2025-04-24 2025-03-31 13F TENABLE HLDGS COM 88025T102 24,935 14 0.06 872 -11.11 0.0216
2025-01-07 2024-12-31 13F TENABLE HLDGS COM 88025T102 24,921 -1,659 -6.24 981 -8.91 0.0239
2024-10-07 2024-09-30 13F TENABLE HLDGS COM 88025T102 26,580 9,262 53.48 1,077 42.84 0.0271
2024-07-16 2024-06-30 13F TENABLE HLDGS COM 88025T102 17,318 4,552 35.66 755 19.49 0.0213
2024-04-18 2024-03-31 13F TENABLE HLDGS COM 88025T102 12,766 5,865 84.99 631 99.05 0.0190
2024-01-08 2023-12-31 13F TENABLE HLDGS COM 88025T102 6,901 361 5.52 318 8.56 0.0107
2023-11-17 2023-09-30 13F TENABLE HLDGS COM 88025T102 6,540 -18,364 -73.74 293 -73.06 0.0111
2023-07-18 2023-06-30 13F TENABLE HLDGS COM 88025T102 24,904 135 0.55 1,085 -7.82 0.0396
2023-04-07 2023-03-31 13F TENABLE HLDGS COM 88025T102 24,769 578 2.39 1,177 27.41 0.0458
2023-01-17 2022-12-31 13F TENABLE HLDGS COM 88025T102 24,191 2,399 11.01 1 -100.00 0.0384
2022-10-14 2022-09-30 13F TENABLE HLDGS COM 88025T102 21,792 -2,853 -11.58 758 -32.26 0.0343
2022-07-12 2022-06-30 13F TENABLE HLDGS COM 88025T102 24,645 -524 -2.08 1,119 -23.09 0.0469
2022-04-07 2022-03-31 13F TENABLE HLDGS COM 88025T102 25,169 154 0.62 1,455 5.59 0.0508
2022-01-13 2021-12-31 13F TENABLE HLDGS COM 88025T102 25,015 -2,572 -9.32 1,378 8.25 0.0454
2022-01-13 2021-09-30 13F TENABLE HLDGS COM 88025T102 27,587 3,681 15.40 1,273 28.72 0.0458
2021-07-20 2021-06-30 13F TENABLE HLDGS COM 88025T102 23,906 -2,353 -8.96 989 4.11 0.0357
2021-05-10 2021-03-31 13F TENABLE HLDGS COM 88025T102 26,259 2,473 10.40 950 -23.57 0.0366
2021-01-08 2020-12-31 13F TENABLE HLDGS COM 88025T102 23,786 -1,828 -7.14 1,243 28.54 0.0504
2020-10-15 2020-09-30 13F TENABLE HLDGS COM 88025T102 25,614 -1,023 -3.84 967 21.79 0.0446
2020-07-07 2020-06-30 13F TENABLE HLDGS COM 88025T102 26,637 7,637 40.19 794 91.33 0.0401
2020-04-10 2020-03-31 13F TENABLE HLDGS COM 88025T102 19,000 2,815 17.39 415 6.96 0.0243
2020-01-09 2019-12-31 13F TENABLE HLDGS COM 88025T102 16,185 7,010 76.40 388 89.27 0.0174
2019-10-09 2019-09-30 13F TENABLE HLDGS COM 88025T102 9,175 9,175 205 0.0096
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.