Company · Ownership research

NAPCO SECURITY TECHNOLOGIES, INC NSSC

CIK 0000069633 · CUSIP 630402105

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 630402105 (NSSC), not CUSIP 630402905 (NSSC), CUSIP 630402955 (NSSC), and does not merge CUSIPs.

This page lists the top 20 of 262 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	BlackRock, Inc. CIK 2012383 · View history	$132.90M 3,284,676 shares	0.00%	—	SEC filing ↗ Nov 13, 2024	▾
02	VANGUARD GROUP INC CIK 102909 · View history	$113.98M 2,817,169 shares	0.00%	+134.26K(+5.00%)Added	SEC filing ↗ Nov 13, 2024	▾
03	FMR LLC CIK 315066 · View history	$85.07M 2,102,688 shares	0.01%	+494.99K(+30.80%)Added	SEC filing ↗ Nov 13, 2024	▾
04	FIL Ltd CIK 318989 · View history	$59.41M 1,468,328 shares	0.05%	0(0.00%)Unchanged	SEC filing ↗ Nov 13, 2024	▾
05	Copeland Capital Management, LLC CIK 1541743 · View history	$42.00M 1,038,128 shares	0.73%	+540.44K(+108.60%)Added	SEC filing ↗ Oct 21, 2024	▾
06	DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history	$41.11M 1,016,042 shares	0.01%	-54.29K(-5.10%)Reduced	SEC filing ↗ Nov 7, 2024	▾
07	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$38.81M 959,035 shares	0.00%	+120.30K(+14.30%)Added	SEC filing ↗ Nov 12, 2024	▾
08	Alyeska Investment Group, L.P. CIK 1453072 · View history	$33.40M 825,608 shares	0.17%	+825.61KNew	SEC filing ↗ Nov 14, 2024	▾
09	JANUS HENDERSON GROUP PLC CIK 1274173 · View history	$33.03M 816,264 shares	0.02%	-96.99K(-10.60%)Reduced	SEC filing ↗ Nov 14, 2024	▾
10	STATE STREET CORP CIK 93751 · View history	$31.79M 783,327 shares	0.00%	+16.93K(+2.20%)Added	SEC filing ↗ Nov 14, 2024	▾
11	MORGAN STANLEY CIK 895421 · Amended · View history	$29.01M 717,060 shares	0.00%	+463.52K(+182.80%)Added	SEC filing ↗ May 14, 2025	▾
12	Doma Perpetual Capital Management LLC CIK 1962221 · View history	$28.61M 707,036 shares	14.45%	+507.52K(+254.40%)Added	SEC filing ↗ Nov 14, 2024	▾
13	NORTHERN TRUST CORP CIK 73124 · View history	$27.51M 679,930 shares	0.00%	+93.11K(+15.90%)Added	SEC filing ↗ Nov 13, 2024	▾
14	Aberdeen Group plc CIK 1716774 · View history	$27.11M 670,012 shares	0.05%	-137.93K(-17.10%)Reduced	SEC filing ↗ Oct 25, 2024	▾
15	ROYAL BANK OF CANADA CIK 1000275 · View history	$23.74M 586,774 shares	0.01%	+28.50K(+5.10%)Added	SEC filing ↗ Nov 14, 2024	▾
16	Granite Investment Partners, LLC CIK 1542266 · View history	$22.24M 549,561 shares	0.95%	-43.58K(-7.30%)Reduced	SEC filing ↗ Nov 12, 2024	▾
17	EMERALD ADVISERS, LLC CIK 1015083 · View history	$20.56M 508,257 shares	0.80%	+19.67K(+4.00%)Added	SEC filing ↗ Oct 29, 2024	▾
18	ENVESTNET ASSET MANAGEMENT INC CIK 1407543 · View history	$20.09M 496,547 shares	0.01%	+111.19K(+28.90%)Added	SEC filing ↗ Nov 7, 2024	▾
19	GW&K Investment Management, LLC CIK 1082917 · View history	$18.06M 446,466 shares	0.15%	-371.35K(-45.40%)Reduced	SEC filing ↗ Nov 7, 2024	▾
20	JACOBS LEVY EQUITY MANAGEMENT, INC CIK 884414 · View history	$17.78M 439,421 shares	0.07%	+114.35K(+35.20%)Added	SEC filing ↗ Nov 14, 2024	▾

Showing 20 / 262 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

262

Cancelled or null records excluded

Disclosed shares

33,644,793

Not deduplicated across managers

Disclosed value

$1.36B

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

NAPCO SECURITY TECHNOLOGIES, INC · Q3 2024

Explore all 262 reporting institutions.

This page includes 20 of 262 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.

Download CSV
Earlier quarters
Advanced screening & filtering
API & AI access

Already have an account?

＋ New accounts get free API credits to explore data beyond ownership filings.

For AI agents & developers

The initial HTML of this page carries its exact data as script#research-data (JSON): values, units, scope, preview limits and SEC sources. Read it directly, no script or API key needed; script#research-access says what needs an account. This page lists 20 of 262 reporting institutions; totals use the complete disclosed data.

Without an account: the last 3 years, with the row caps stated on the page. A free account opens all history on file on these pages and the CSV of what a page shows. Rows beyond the caps and bulk retrieval go through the authenticated API / MCP / CLI.

MCP  https://api.akkrudata.ai/mcp

akkru_institutional_holdings
{"action":"holders","cusip":"630402105","quarter":"2024Q3","type":"positions","page_size":100}

Connect to MCP with OAuth and follow the returned pagination. Credits and usage limits depend on the account.

MCP endpoint: https://api.akkrudata.ai/mcp
API / MCP / CLI documentation: /documents
llms.txt: /llms.txt

Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.