Napco Security Technologies, Inc.
US ˙ NasdaqGS ˙ US6304021057

SecurityNSSC / Napco Security Technologies, Inc.
InstitutionState Street Corp
Latest Disclosed Ownership1,431,503 shares
Latest Disclosed Value $ 56,519,754
State Street Corp reports 59.71% increase in ownership of NSSC / Napco Security Technologies, Inc.

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 1,431,503 shares of Napco Security Technologies, Inc. (US:NSSC) valued at $56,386,903 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 896,315 shares of Napco Security Technologies, Inc.. This represents a change in shares of 59.71% during the quarter. The current value of the position is $51,204,862 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 NAPCO SEC TECHNOLOGIES COM 630402105 1,431,503 535,188 59.71 56,520 50.79 0.0020
2026-02-13 2025-12-31 13F NAPCO SEC TECHNOLOGIES COM 630402105 896,315 112,495 14.35 37,484 10.98 0.0013
2025-11-14 2025-09-30 13F NAPCO SEC TECHNOLOGIES COM 630402105 783,820 -29,844 -3.67 33,775 39.17 0.0012
2025-08-14 2025-06-30 13F NAPCO SEC TECHNOLOGIES COM 630402105 813,664 -777 -0.10 24,269 28.75 0.0009
2025-05-15 2025-03-31 13F NAPCO SEC TECHNOLOGIES COM 630402105 814,441 -12,109 -1.47 18,849 -36.09 0.0008
2025-02-14 2024-12-31 13F NAPCO SEC TECHNOLOGIES COM 630402105 826,550 43,223 5.52 29,493 -7.22 0.0012
2024-11-14 2024-09-30 13F NAPCO SEC TECHNOLOGIES COM 630402105 783,327 16,931 2.21 31,790 -20.16 0.0013
2024-08-14 2024-06-30 13F NAPCO SEC TECHNOLOGIES COM 630402105 766,396 39,491 5.43 39,814 36.39 0.0017
2024-05-15 2024-03-31 13F NAPCO SEC TECHNOLOGIES COM 630402105 726,905 30,829 4.43 29,193 22.45 0.0013
2024-02-14 2023-12-31 13F NAPCO SEC TECHNOLOGIES COM 630402105 696,076 53,807 8.38 23,841 66.83 0.0012
2023-11-14 2023-09-30 13F NAPCO SEC TECHNOLOGIES COM 630402105 642,269 7,666 1.21 14,290 -35.01 0.0008
2023-08-14 2023-06-30 13F NAPCO SEC TECHNOLOGIES COM 630402105 634,603 7,342 1.17 21,989 -6.72 0.0012
2023-05-15 2023-03-31 13F NAPCO SEC TECHNOLOGIES COM 630402105 627,261 58,963 10.38 23,572 50.95 0.0013
2023-05-15 2022-12-31 13F/A-99 NAPCO SEC TECHNOLOGIES COM 630402105 568,298 15,064 2.72 15,617 -2.93 0.0009
2023-05-15 2022-12-31 13F NAPCO SEC TECHNOLOGIES COM 630402105 568,298 15,064 15,617 0.0009
2022-11-15 2022-09-30 13F NAPCO SEC TECHNOLOGIES COM 630402105 553,234 1,810 0.33 16,088 41.69 0.0010
2022-08-15 2022-06-30 13F NAPCO SEC TECHNOLOGIES COM 630402105 551,424 4,216 0.77 11,354 1.11 0.0007
2022-05-16 2022-03-31 13F NAPCO SEC TECHNOLOGIES COM 630402105 547,208 288,327 111.37 11,229 -13.22 0.0006
2022-02-14 2021-12-31 13F NAPCO SEC TECHNOLOGIES COM 630402105 258,881 12,579 5.11 12,939 21.94 0.0006
2021-11-15 2021-09-30 13F NAPCO SEC TECHNOLOGIES COM 630402105 246,302 5,087 2.11 10,611 20.95 0.0006
2021-08-16 2021-06-30 13F NAPCO SEC TECHNOLOGIES COM 630402105 241,215 19,628 8.86 8,773 13.67 0.0005
2021-07-09 2021-03-31 13F/A-1 NAPCO SEC TECHNOLOGIES COM 630402105 221,587 2,877 1.32 7,718 34.58 0.0004
2021-05-17 2021-03-31 13F NAPCO SEC TECHNOLOGIES COM 630402105 221,587 2,877 7,718 0.0004
2021-02-16 2020-12-31 13F NAPCO SEC TECHNOLOGIES COM 630402105 218,710 -13,340 -5.75 5,735 5.17 0.0004
2020-11-10 2020-09-30 13F NAPCO SEC TECHNOLOGIES COM 630402105 232,050 -1,107 -0.47 5,453 -0.02 0.0004
2020-08-14 2020-06-30 13F NAPCO SEC TECHNOLOGIES COM 630402105 233,157 6,206 2.73 5,454 58.41 0.0004
2020-06-19 2020-03-31 13F/A-1 NAPCO SEC TECHNOLOGIES COM 630402105 226,951 -7,275 -3.11 3,443 -49.99 0.0003
2020-05-11 2020-03-31 13F NAPCO SEC TECHNOLOGIES COM 630402105 226,951 -7,275 3,443 302.3647
2020-02-06 2019-12-31 13F NAPCO SEC TECHNOLOGIES COM 630402105 234,226 12,551 5.66 6,884 21.69 0.0005
2019-11-14 2019-09-30 13F NAPCO SEC TECHNOLOGIES COM 630402105 221,675 847 0.38 5,657 -13.69 0.0004
2019-08-14 2019-06-30 13F NAPCO SEC TECHNOLOGIES COM 630402105 220,828 13,698 6.61 6,554 52.56 0.0005
2019-05-15 2019-03-31 13F NAPCO SEC TECHNOLOGIES COM 630402105 207,130 17,243 9.08 4,296 43.63 0.0003
2019-02-12 2018-12-31 13F NAPCO SEC TECHNOLOGIES COM 630402105 189,887 -3,001 -1.56 2,991 3.78 0.0003
2018-11-09 2018-09-30 13F NAPCO SECURITY TECH Common equity shares 630402105 192,888 13,770 7.69 2,882 9.87 0.0002
2018-08-14 2018-06-30 13F NAPCO SECURITY TECH Common equity shares 630402105 179,118 1,462 0.82 2,623 26.11 0.0002
2018-05-15 2018-03-31 13F NAPCO SECURITY TECH Common equity shares 630402105 177,656 35,005 24.54 2,080 66.93 0.0002
2018-02-14 2017-12-31 13F NAPCO SECURITY TECH Common equity shares 630402105 142,651 22,253 18.48 1,246 6.68 0.0001
2017-11-14 2017-09-30 13F NAPCO SECURITY TECH Common equity shares 630402105 120,398 4,648 4.02 1,168 7.25 0.0001
2017-08-14 2017-06-30 13F NAPCO SECURITY TECH Common equity shares 630402105 115,750 104,950 971.76 1,089 890.00 0.0001
2017-05-15 2017-03-31 13F NAPCO SECURITY TECH Common equity shares 630402105 10,800 0 0.00 110 19.57 0.0000
2017-02-09 2016-12-31 13F NAPCO SECURITY TECH Common equity shares 630402105 10,800 0 0.00 92 17.95 0.0000
2017-01-13 2016-09-30 13F/A-1 NAPCO SECURITY TECH Common equity shares 630402105 10,800 0 0.00 78 14.71 0.0000
2016-11-14 2016-09-30 13F NAPCO SECURITY TECH Common equity shares 630402105 10,800 78
2016-08-12 2016-06-30 13F NAPCO SECURITY TECH Common equity shares 630402105 10,800 0 0.00 68 1.49 0.0000
2016-05-20 2016-03-31 13F/A-1 NAPCO SECURITY TECH Common equity shares 630402105 10,800 0 0.00 67 4.69 0.0000
2016-05-12 2016-03-31 13F NAPCO SECURITY TECH Common equity shares 630402105 10,800 67
2016-02-16 2015-12-31 13F NAPCO SECURITY TECH Common equity shares 630402105 10,800 0 0.00 64 -3.03 0.0000
2015-11-16 2015-09-30 13F NAPCO SECURITY TECH Common equity shares 630402105 10,800 0 0.00 66 6.45 0.0000
2015-08-13 2015-06-30 13F NAPCO SECURITY TECH Common equity shares 630402105 10,800 0 0.00 62 0.00 0.0000
2015-05-15 2015-03-31 13F NAPCO SECURITY TECH Common equity shares 630402105 10,800 0 0.00 62 24.00 0.0000
2015-02-11 2014-12-31 13F NAPCO SECURITY TECH Common equity shares 630402105 10,800 -1,300 -10.74 50 -10.71 0.0000
2014-11-12 2014-09-30 13F/A-1 NAPCO SECURITY TECH Common equity shares 630402105 12,100 0 0.00 56 -15.15 0.0000
2014-11-10 2014-09-30 13F NAPCO SECURITY TECH Common equity shares 630402105 12,100 56
2014-08-12 2014-06-30 13F NAPCO SECURITY TECH Common equity shares 630402105 12,100 0 0.00 66 -17.50 0.0000
2014-05-15 2014-03-31 13F/A-1 NAPCO SECURITY TECH Common equity shares 630402105 12,100 0 0.00 80 5.26 0.0000
2014-05-13 2014-03-31 13F NAPCO SECURITY TECH Common equity shares 630402105 12,100 80
2014-02-06 2013-12-31 13F/A-1 NAPCO SECURITY TECH Common equity shares 630402105 12,100 0 0.00 76 18.75 0.0000
2014-02-06 2013-12-31 13F NAPCO SECURITY TECH Common equity shares 630402105 12,100 44
2013-11-12 2013-09-30 13F NAPCO SECURITY TECH Common equity shares 630402105 12,100 0 0.00 64 10.34 0.0000
2013-08-08 2013-06-30 13F NAPCO SECURITY TECH Common equity shares 630402105 12,100 12,100 58 0.0000
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.