Napco Security Technologies, Inc.
Napco Security Technologies, Inc. (NSSC) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · NSSC · as of Sep 30, 2025
Ownership Breakdown
246
Institutional Holders
▲ 20 vs Q2
$1.37B
Total Inst. Value
▲ $406.45M vs Q2
35.73M
Shares Outstanding
freeFloat 96.27%
31.83M
13F Shares Held
▼ 523,323 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
NSSC largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
BLACKROCK, INC. communications equipment, nec | 2.88M | 7.95% | 7.95% | $123.86B | Nov 12, 2025 | ▼ 114.7K |
VANGUARD GROUP INC communications equipment, nec | 2.85M | 7.85% | 7.85% | $122.43B | Nov 7, 2025 | ▼ 9.0K |
FUNDSMITH LLP communications equipment, nec | 1.78M | 4.90% | 4.90% | $76.44B | Nov 14, 2025 | ▲ 824.9K |
JANUS HENDERSON GROUP PLC communications equipment, nec | 1.52M | 4.20% | 4.20% | $65.47B | Nov 14, 2025 | ▲ 55.6K |
COPELAND CAPITAL MANAGEMENT, LLC communications equipment, nec | 1.50M | 4.13% | 4.13% | $64.32B | Oct 17, 2025 | ▼ 88.2K |
DOMA PERPETUAL CAPITAL MANAGEMENT LLC communications equipment, nec | 1.17M | 3.21% | 3.21% | $50.05B | Nov 14, 2025 | ▼ 10.3K |
GEODE CAPITAL MANAGEMENT, LLC communications equipment, nec | 1.02M | 2.82% | 2.82% | $44.01B | Nov 12, 2025 | ▼ 7.0K |
WELLINGTON MANAGEMENT GROUP LLP communications equipment, nec | 1.01M | 2.78% | 2.78% | $43.33B | Nov 14, 2025 | ▼ 30.4K |
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP communications equipment, nec | 861.1K | 2.37% | 2.37% | $36.99B | Nov 13, 2025 | ▲ 749.1K |
STATE STREET CORP communications equipment, nec | 783.8K | 2.16% | 2.16% | $33.78B | Nov 14, 2025 | ▼ 29.8K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
14
Increased
+2.83M shares2
New Positions
first time holders32
Decreased
−2.26M shares0
Sold Out
fully exitedNet shares change (top 50)
+575.0K
+2.83M / −2.26M
Net new holders
-16
2 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
NSSC insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
6
Buy transactions
6
Sell transactions
1.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Spinelli Stephen M Senior Vice President of Sales | Mar 17, 2026 | Tax Withhold | 3,212 | $43.59 | $140.0K | 11.7K | Form 4 ↗ |
SOLOWAY RICHARD CEO, Chairman of Board, Secy | Mar 2, 2026 | Sale | 129,682 | $44.99 | $5.83M | 1.15M | Form 4 ↗ |
SOLOWAY RICHARD CEO, Chairman of Board, Secy | Mar 3, 2026 | Sale | 55,318 | $43.22 | $2.39M | 1.10M | Form 4 ↗ |
CARRIERI MICHAEL Executive VP of Engineering | Feb 26, 2026 | Tax Withhold | 6,651 | $47.23 | $314.1K | 26.6K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Napco Security Technologies, Inc. (NSSC) is primarily owned by institutional investors, who hold approximately 89.1% of total shares outstanding. Company insiders own approximately 3.73%, while retail and public investors account for the remaining 7.19%.
The largest institutional shareholder of Napco Security Technologies, Inc. is BLACKROCK, INC., holding approximately 2.88 million shares — equal to 7.95% of outstanding shares — as of September 30, 2025.
A total of 246 institutional investors currently hold NSSC stock, with a combined institutional value of approximately $1.37 billion as of the most recent 13F filing period.
Frequently asked questions
NSSC ownershipNapco Security Technologies, Inc. (NSSC) is primarily owned by institutional investors, who hold approximately 89.1% of shares. The largest shareholder is BLACKROCK, INC. with a 7.95% stake. Company insiders hold 3.73%. Data sourced from SEC Form 13F as of September 30, 2025.