Tenable Holdings, Inc.
US ˙ NasdaqGS ˙ US88025T1025

SecurityTENB / Tenable Holdings, Inc.
InstitutionMorgan Stanley
Latest Disclosed Ownership2,207,280 shares
Latest Disclosed Value $ 37,336,166
Morgan Stanley reports 19.10% decrease in ownership of TENB / Tenable Holdings, Inc.

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 2,207,280 shares of Tenable Holdings, Inc. (US:TENB) valued at $37,336,141 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 2,728,338 shares of Tenable Holdings, Inc.. This represents a change in shares of -19.10% during the quarter. The current value of the position is $65,534,143 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)
2026-05-15 2026-03-31 13F TENABLE HLDGS COM 88025T102 2,207,280 -521,058 -19.10 37,336 -41.84 0.0022
2026-05-27 2025-12-31 13F/A-1 TENABLE HLDGS COM 88025T102 2,728,338 413,419 17.86 64,198 -4.90 0.0038
2026-02-13 2025-12-31 13F TENABLE HLDGS COM 88025T102 2,728,338 413,419 64,198 0.0038
2026-05-27 2025-09-30 13F/A-1 TENABLE HLDGS COM 88025T102 2,314,919 -1,905,694 -45.15 67,503 -52.65 0.0041
2025-11-14 2025-09-30 13F TENABLE HLDGS COM 88025T102 2,314,919 -1,905,694 67,503 0.0041
2025-08-15 2025-06-30 13F TENABLE HLDGS COM 88025T102 4,220,613 3,022,671 252.32 142,572 240.23 0.0093
2025-05-15 2025-03-31 13F TENABLE HLDGS COM 88025T102 1,197,942 -419,902 -25.95 41,904 -34.23 0.0030
2025-05-15 2024-12-31 13F/A-1 TENABLE HLDGS COM 88025T102 1,617,844 140,508 9.51 63,711 6.43 0.0045
2025-02-14 2024-12-31 13F TENABLE HLDGS COM 88025T102 1,617,844 140,508 63,711 0.0045
2025-05-14 2024-09-30 13F/A-2 TENABLE HLDGS COM 88025T102 1,477,336 52,699 3.70 59,862 -3.58 0.0043
2025-02-14 2024-09-30 13F/A-1 TENABLE HLDGS COM 88025T102 1,477,336 52,699 59,862 0.0043
2024-11-14 2024-09-30 13F TENABLE HLDGS COM 88025T102 1,477,336 52,699 59,862 0.0005
2025-05-14 2024-06-30 13F/A-2 TENABLE HLDGS COM 88025T102 1,424,637 115,174 8.80 62,086 -4.08 0.0048
2024-10-17 2024-06-30 13F/A-1 TENABLE HLDGS COM 88025T102 1,424,637 115,174 62,086 0.0048
2024-08-14 2024-06-30 13F TENABLE HLDGS COM 88025T102 1,424,637 115,174 62,086 0.0048
2024-10-17 2024-03-31 13F/A-2 TENABLE HLDGS COM 88025T102 1,309,463 184,034 16.35 64,727 24.86 0.0052
2024-08-16 2024-03-31 13F/A-1 TENABLE HLDGS COM 88025T102 1,309,463 184,034 64,727 0.0006
2024-05-15 2024-03-31 13F TENABLE HLDGS COM 88025T102 1,309,463 184,034 64,727 0.0052
2024-08-16 2023-12-31 13F/A-1 TENABLE HLDGS COM 88025T102 1,125,429 144,864 14.77 51,837 18.00 0.0046
2024-02-13 2023-12-31 13F TENABLE HLDGS COM 88025T102 1,125,429 144,864 51,837 0.0046
2023-11-15 2023-09-30 13F TENABLE HLDGS COM 88025T102 980,565 -11,169 -1.13 43,929 1.71 0.0045
2023-08-14 2023-06-30 13F TENABLE HLDGS COM 88025T102 991,734 68,304 7.40 43,190 -1.55 0.0043
2023-05-15 2023-03-31 13F TENABLE HLDGS COM 88025T102 923,430 -48,310 -4.97 43,872 18.35 0.0047
2023-02-14 2022-12-31 13F TENABLE HLDGS COM 88025T102 971,740 468,985 93.28 37,072 111.87 0.0042
2022-11-14 2022-09-30 13F TENABLE HLDGS COM 88025T102 502,755 -134,818 -21.15 17,497 -39.56 0.0024
2022-10-27 2022-06-30 13F/A-1 TENABLE HLDGS COM 88025T102 637,573 50,106 8.53 28,951 -14.72 0.0038
2022-08-15 2022-06-30 13F TENABLE HLDGS COM 88025T102 637,573 50,106 28,951 0.0038
2022-10-27 2022-03-31 13F/A-1 TENABLE HLDGS COM 88025T102 587,467 -11,405 -1.90 33,949 2.94 0.0046
2022-05-13 2022-03-31 13F TENABLE HLDGS COM 88025T102 587,467 -11,405 33,949 0.0046
2022-02-14 2021-12-31 13F TENABLE HLDGS COM 88025T102 598,872 -96,144 -13.83 32,981 2.84 0.0041
2021-11-15 2021-09-30 13F TENABLE HLDGS COM 88025T102 695,016 -375,701 -35.09 32,069 -27.56 0.0043
2021-08-23 2021-06-30 13F/A-1 TENABLE HLDGS COM 88025T102 1,070,717 240,686 29.00 44,272 47.40 0.0058
2021-08-16 2021-06-30 13F TENABLE HLDGS COM 88025T102 1,070,717 240,686 44,272 0.0012
2021-05-17 2021-03-31 13F TENABLE HLDGS COM 88025T102 830,031 420,169 102.51 30,035 40.22 0.0044
2021-02-16 2020-12-31 13F TENABLE HLDGS COM 88025T102 409,862 167,364 69.02 21,420 134.00 0.0033
2020-11-13 2020-09-30 13F TENABLE HLDGS COM 88025T102 242,498 139,599 135.67 9,154 198.37 0.0018
2020-08-14 2020-06-30 13F TENABLE HLDGS COM 88025T102 102,899 23,207 29.12 3,068 76.12 0.0007
2020-05-26 2020-03-31 13F/A-1 TENABLE HLDGS COM 88025T102 79,692 -254,427 -76.15 1,742 -78.24 0.0005
2020-05-15 2020-03-31 13F TENABLE HLDGS COM 88025T102 79,692 -254,427 1,742 133.8219
2020-02-14 2019-12-31 13F TENABLE HLDGS COM 88025T102 334,119 149,818 81.29 8,006 94.08 0.0019
2019-11-14 2019-09-30 13F TENABLE HLDGS COM 88025T102 184,301 -5,982 -3.14 4,125 -24.05 0.0011
2019-08-14 2019-06-30 13F TENABLE HLDGS COM 88025T102 190,283 -2,367,106 -92.56 5,431 -93.29 0.0014
2019-05-15 2019-03-31 13F TENABLE HLDGS COM 88025T102 2,557,389 2,482,351 3,308.13 80,967 4,762.88 0.0229
2019-02-14 2018-12-31 13F TENABLE HLDGS COM 88025T102 75,038 -51,752 -40.82 1,665 -66.23 0.0005
2019-04-23 2018-09-30 13F/A-2 TENABLE HLDGS COM 88025T102 126,790 126,790 4,930 0.0012
2018-11-20 2018-09-30 13F/A-1 TENABLE HLDGS COM 88025T102 126,790 0 4,930 0.0012
2018-11-14 2018-09-30 13F TENABLE HLDGS COM 88025T102 126,790 4,930 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.