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NSSC in the 13F filings

Napco Security Systems Inc · CUSIP 630402105

Sector · Technology hardware and equipment
Quarter
Q2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023Q3 2023
Quarter end
31 Dec 2025
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 5 Feb 2026
Managers listing it
31
at least, of 95 tracked, among listed positions
Comparable managers
92
filed both Q3 2025 and Q4 2025; 4 listed it in both
Shares listed
5,915,023
combined, among listed positions
Reported value
$247m
combined, at the quarter end

Among the 92 comparable managers: 16 buyers (opened or added shares) and 15 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +7,928.

Managers listing NSSC in Q4 2025

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q3 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

31 of 31 holders

ActionFiling
Janus Henderson Group Ltd1,569,363$65munder 0.1%Added+45,09317 Feb 2026 (the filing on sec.gov)
Wellington Management Group LLP879,298$37munder 0.1%Trimmed-129,55917 Feb 2026 (the filing on sec.gov)
Arrowstreet Capital LP864,022$36munder 0.1%Added+2,88113 Feb 2026 (the filing on sec.gov)
Renaissance Technologies LLC333,200$14munder 0.1%Added+18,10012 Feb 2026 (the filing on sec.gov)
AQR Capital Management LLC297,027$12munder 0.1%Trimmed-34,47917 Feb 2026 (the filing on sec.gov)
Point72 Asset Management LP257,840$11munder 0.1%Added+130,59917 Feb 2026 (the filing on sec.gov)
Tudor Investment Corp200,489$8.4munder 0.1%Added+111,27717 Feb 2026 (the filing on sec.gov)
GAMCO Investors Inc188,400$7.9m0.08%Trimmed-9,6005 Feb 2026 (the filing on sec.gov)
Voloridge Investment Management LLC185,645$7.7munder 0.1%Trimmed-12,04617 Feb 2026 (the filing on sec.gov)
Citadel Advisors LLC142,545$5.9munder 0.1%Trimmed-20,25017 Feb 2026 (the filing on sec.gov)
PDT Partners LLC124,614$5.2m0.34%Held017 Feb 2026 (the filing on sec.gov)
Man Group PLC119,324$5.0munder 0.1%Added+28,05517 Feb 2026 (the filing on sec.gov)
Marshall Wace LLP98,006$4.1munder 0.1%Added+4,30813 Feb 2026 (the filing on sec.gov)
D. E. Shaw & Co.75,362$3.1munder 0.1%Trimmed-88,53417 Feb 2026 (the filing on sec.gov)
Millennium Management LLC73,487$3.1munder 0.1%Trimmed-49,31117 Feb 2026 (the filing on sec.gov)
Verition Fund Management LLC63,535$2.6munder 0.1%Trimmed-18,30313 Feb 2026 (the filing on sec.gov)
Acadian Asset Management LLC61,117$2.5munder 0.1%Added+41,08310 Feb 2026 (the filing on sec.gov)
Walleye Capital LLC60,108$2.5munder 0.1%Newnew13 Feb 2026 (the filing on sec.gov)
Invesco Ltd49,109$2.0munder 0.1%Added+6,79819 Feb 2026 (the filing on sec.gov)
AllianceBernstein LP41,777$1.7munder 0.1%Added+4,95117 Feb 2026 (the filing on sec.gov)
Jane Street Group LLC35,912$1.5munder 0.1%Newnew12 Feb 2026 (the filing on sec.gov)
Susquehanna International Group LLP29,323$1.2munder 0.1%Trimmed-10,04917 Feb 2026 (the filing on sec.gov)
Two Sigma Advisers LP27,700$1.2munder 0.1%Added+15,70017 Feb 2026 (the filing on sec.gov)
Two Sigma Investments LP26,600$1.1munder 0.1%Newnew17 Feb 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc25,291$1.1munder 0.1%Added+98517 Feb 2026 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q3 2025 to Q4 2025, among managers that listed it in both quarters or opened it.

Increases

Reductions

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (4)

Exited (2)

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.
3 in Q3 2024 to 4 in Q2 2026

Tracked managers listing it, at least.

012342023202420252026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
NSSC by quarter
QuarterHoldersReported valueBuyersSellers
Q2 20221$36mn.a.n.a.
Q3 20221$50mn.a.n.a.
Q4 20221$43mn.a.n.a.
Q1 20232$47mn.a.n.a.
Q2 20231$32mn.a.n.a.
Q3 20231$3.9mn.a.n.a.
Q4 20232$39m20
Q1 20243$49m21
Q2 20244$75m13
Q3 20243$43m11
Q4 20244$64m21
Q1 20252$7.7m20
Q2 20254$55m31
Q3 20254$80m21
Q4 20254$79m1615
Q1 20264$69m1220
Q2 20264$75m1015

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

NSSC and AAPL →NSSC and SNDK →NSSC and CSCO →Choose a stock to compare with NSSC →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own NSSC, latest filings →Back to the 13F Explorer →