Tenable Holdings, Inc.
US ˙ NasdaqGS ˙ US88025T1025

SecurityTENB / Tenable Holdings, Inc.
InstitutionMackenzie Financial Corp
Latest Disclosed Ownership2,477,616 shares
Latest Disclosed Value $ 41,908,875
Mackenzie Financial Corp reports 3.39% decrease in ownership of TENB / Tenable Holdings, Inc.

On May 13, 2026 - Mackenzie Financial Corp filed a 13F-HR form disclosing ownership of 2,477,616 shares of Tenable Holdings, Inc. (US:TENB) valued at $41,908,875 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 18, 2026 disclosing 2,564,595 shares of Tenable Holdings, Inc.. This represents a change in shares of -3.39% during the quarter. The current value of the position is $72,569,373 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)
2026-05-13 2026-03-31 13F TENABLE HLDGS COM 88025T102 2,477,616 -86,979 -3.39 41,909 -31.26 0.0503
2026-02-18 2025-12-31 13F TENABLE HLDGS COM 88025T102 2,564,595 58,325 2.33 60,968 -16.58 0.0722
2025-11-13 2025-09-30 13F TENABLE HLDGS COM 88025T102 2,506,270 -183,768 -6.83 73,083 -19.57 0.0885
2025-08-13 2025-06-30 13F TENABLE HLDGS COM 88025T102 2,690,038 -1,057,747 -28.22 90,869 -30.69 0.1177
2025-05-07 2025-03-31 13F TENABLE HLDGS COM 88025T102 3,747,785 -135,182 -3.48 131,098 -14.27 0.1864
2025-05-02 2024-12-31 13F/A-2 TENABLE HLDGS COM 88025T102 3,882,967 -295,702 -7.08 152,911 -9.69 0.2084
2025-02-20 2024-12-31 13F/A-1 TENABLE HLDGS COM 88025T102 3,882,967 -295,702 152,911 0.1987
2025-02-14 2024-12-31 13F Tenable Holdings Common Stock 88025T102 3,882,967 -295,702 129,419 0.1858
2024-11-13 2024-09-30 13F TENABLE HLDGS COM 88025T102 4,178,669 -13,266 -0.32 169,320 -7.32 0.2356
2024-08-14 2024-06-30 13F TENABLE HLDGS COM 88025T102 4,191,935 471,126 12.66 182,685 -0.67 0.2714
2024-05-10 2024-03-31 13F TENABLE HLDGS COM 88025T102 3,720,809 682,657 22.47 183,920 31.43 0.2650
2024-01-30 2023-12-31 13F TENABLE HLDGS COM 88025T102 3,038,152 16,515 0.55 139,937 6.05 0.2110
2023-10-25 2023-09-30 13F TENABLE HLDGS COM 88025T102 3,021,637 27,875 0.93 131,955 3.18 0.2218
2023-08-03 2023-06-30 13F TENABLE HLDGS COM 88025T102 2,993,762 231,570 8.38 127,894 -2.54 0.1940
2023-04-24 2023-03-31 13F TENABLE HLDGS COM 88025T102 2,762,192 -24,023 -0.86 131,232 23.46 0.2027
2023-02-14 2022-12-31 13F TENABLE HLDGS COM 88025T102 2,786,215 30,535 1.11 106,294 10.84 0.1775
2022-10-07 2022-09-30 13F Tenable Holdings Common Stock 88025T102 2,755,680 -27,912 -1.00 95,898 -24.13 0.1649
2022-08-10 2022-06-30 13F TENABLE HLDGS COM 88025T102 2,783,592 -244,734 -8.08 126,403 -27.77 0.2025
2022-05-13 2022-03-31 13F TENABLE HLDGS COM 88025T102 3,028,326 38,358 1.28 175,007 6.29 0.2346
2022-02-14 2021-12-31 13F TENABLE HLDGS COM 88025T102 2,989,968 -458,588 -13.30 164,658 3.48 0.2218
2021-11-08 2021-09-30 13F TENABLE HLDGS COM 88025T102 3,448,556 -43,935 -1.26 159,116 10.18 0.2256
2021-08-11 2021-06-30 13F TENABLE HLDGS COM 88025T102 3,492,491 40,788 1.18 144,415 15.62 0.2008
2021-05-14 2021-03-31 13F TENABLE HLDGS COM 88025T102 3,451,703 454,685 15.17 124,900 -20.25 0.1904
2021-02-10 2020-12-31 13F TENABLE HLDGS COM 88025T102 2,997,018 -1,323,233 -30.63 156,624 -3.96 0.3382
2020-11-13 2020-09-30 13F TENABLE HLDGS COM 88025T102 4,320,251 -102,806 -2.32 163,089 23.69 0.4051
2020-08-13 2020-06-30 13F TENABLE HLDGS COM 88025T102 4,423,057 129,474 3.02 131,851 40.48 0.3529
2020-05-14 2020-03-31 13F TENABLE HLDGS COM 88025T102 4,293,583 960,650 28.82 93,858 17.53 0.3018
2020-02-13 2019-12-31 13F TENABLE HLDGS COM 88025T102 3,332,933 999,156 42.81 79,857 52.89 0.1964
2019-11-14 2019-09-30 13F TENABLE HLDGS COM 88025T102 2,333,777 1,878,728 412.86 52,230 302.17 0.1373
2019-08-23 2019-06-30 13F/A-1 TENABLE HLDGS COM 88025T102 455,049 455,049 12,987 0.0335
2019-08-14 2019-06-30 13F TENABLE HLDGS COM 88025T102 455,049 12,987 0.0335
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.