NetScout Systems, Inc.
US ˙ NasdaqGS ˙ US64115T1043

SecurityNTCT / NetScout Systems, Inc.
InstitutionSei Investments Co
Latest Disclosed Ownership282,289 shares
Latest Disclosed Value $ 7,638,604
Sei Investments Co reports 35.42% increase in ownership of NTCT / NetScout Systems, Inc.

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 282,289 shares of NetScout Systems, Inc. (US:NTCT) valued at $7,638,740 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 208,462 shares of NetScout Systems, Inc.. This represents a change in shares of 35.42% during the quarter. The current value of the position is $11,940,825 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 NETSCOUT SYS COM 64115T104 282,289 73,827 35.42 7,639 41.86 0.0075
2025-11-13 2025-09-30 13F NETSCOUT SYS COM 64115T104 208,462 -25,691 -10.97 5,384 -7.32 0.0058
2025-08-14 2025-06-30 13F NETSCOUT SYS COM 64115T104 234,153 21,886 10.31 5,810 30.28 0.0067
2025-05-14 2025-03-31 13F/A-1 NETSCOUT SYS COM 64115T104 212,267 -4,598 -2.12 4,460 -5.07 0.0057
2025-05-13 2025-03-31 13F NETSCOUT SYS COM 64115T104 217,560 695 4,709 0.0051
2025-02-11 2024-12-31 13F NETSCOUT SYS COM 64115T104 216,865 71,815 49.51 4,697 48.92 0.0060
2024-11-12 2024-09-30 13F NETSCOUT SYS COM 64115T104 145,050 92,208 174.50 3,155 226.50 0.0041
2024-08-13 2024-06-30 13F NETSCOUT SYS COM 64115T104 52,842 52,842 966 0.0014
2023-11-14 2023-09-30 13F NETSCOUT SYS COM 64115T104 0 -6,776 -100.00 0 -100.00
2023-08-11 2023-06-30 13F NETSCOUT SYS COM 64115T104 6,776 6,776 210 0.0004
2023-02-10 2022-12-31 13F NETSCOUT SYS COM 64115T104 0 -18,631 -100.00 0 -100.00
2022-11-14 2022-09-30 13F NETSCOUT SYS COM 64115T104 18,631 -17,894 -48.99 584 -52.09 0.0013
2022-08-15 2022-06-30 13F NETSCOUT SYS COM 64115T104 36,525 28,956 382.56 1,219 444.20 0.0026
2022-05-13 2022-03-31 13F NETSCOUT SYS COM 64115T104 7,569 7,569 224 0.0005
2020-08-17 2020-06-30 13F/A-1 NETSCOUT SYS COM 64115T104 0 -39,000 -100.00 0 -100.00
2020-08-11 2020-06-30 13F NETSCOUT SYS COM 64115T104 0 0
2020-05-14 2020-03-31 13F NETSCOUT SYS COM 64115T104 39,000 14,511 59.26 893 62.07 0.0033
2020-02-06 2019-12-31 13F NETSCOUT SYS COM 64115T104 24,489 24,489 551 0.0016
2018-11-08 2018-09-30 13F NETSCOUT SYS COM 64115T104 0 -245 -100.00 0 -100.00
2018-08-03 2018-06-30 13F NETSCOUT SYS COM 64115T104 245 65 36.11 7 40.00 0.0000
2018-05-11 2018-03-31 13F NETSCOUT SYS COM 64115T104 180 -4,615 -96.25 5 -96.58 0.0000
2018-02-08 2017-12-31 13F NETSCOUT SYS COM 64115T104 4,795 4,777 26,538.89 146 14,500.00 0.0005
2017-11-06 2017-09-30 13F NETSCOUT SYS COM 64115T104 18 0 0.00 1 0.00 0.0000
2017-07-31 2017-06-30 13F NETSCOUT SYS COM 64115T104 18 -7,277 -99.75 1 -99.64 0.0000
2017-05-05 2017-03-31 13F NETSCOUT SYS COM 64115T104 7,295 -22,589 -75.59 277 -70.56 0.0012
2017-02-02 2016-12-31 13F NETSCOUT SYS COM 64115T104 29,884 24,085 415.33 941 453.53 0.0046
2016-11-04 2016-09-30 13F NETSCOUT SYS COM 64115T104 5,799 212 3.79 170 37.10 0.0009
2016-08-11 2016-06-30 13F NETSCOUT SYS COM 64115T104 5,587 3,840 219.81 124 210.00 0.0007
2016-05-10 2016-03-31 13F/A-1 NETSCOUT SYS COM 64115T104 1,747 78 4.67 40 -21.57 0.0002
2016-02-03 2015-12-31 13F NETSCOUT SYS COM 64115T104 1,669 0 0.00 51 -13.56 0.0003
2015-11-02 2015-09-30 13F/A-1 NETSCOUT SYS COM 64115T104 1,669 1,669 59 0.0005
2015-10-30 2015-09-30 13F DIREXION SHS ETF TR COM 64115T104 1,669 59
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.