Who owns Napco Security Technologies (NSSC)
Which tracked institutional funds hold NSSC, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See NSSC company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
45 tracked funds added or opened NSSC while 68 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
NSSC’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes NSSC more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in NSSC divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 236 tracked filers holding NSSC, 125 increased or opened the position and 144 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in NSSC between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 6
- Jupiter Topco LLC$64M
- CAPITAL FUND MANAGEMENT S.A.$1M
- DARK FOREST CAPITAL MANAGEMENT LP$917K
- Illinois Municipal Retirement Fund$761K
- Jain Global LLC$736K
- Jacobs Equity LLC$537K
Full exits 30
- JANUS HENDERSON GROUP PLC$56M
- BESSEMER GROUP INC$12M
- Qube Research & Technologies Ltd$7M
- HighTower Advisors, LLC$5M
- Uniplan Investment Counsel, Inc.$4M
- Walleye Capital LLC$4M
Largest adds
- BlackRock, Inc.$62M
- FIRST TRUST ADVISORS LP$23M
- MORGAN STANLEY$18M
- DEPRINCE RACE & ZOLLO INC$11M
- Fundsmith LLP$8M
- HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND$7M
Largest trims
- PRUDENTIAL FINANCIAL INC$19M
- JACOBS LEVY EQUITY MANAGEMENT, INC$9M
- ALGERT GLOBAL LLC$8M
- Man Group plc$7M
- ARROWSTREET CAPITAL, LIMITED PARTNERSHIP$7M
- Point72 Asset Management, L.P.$5M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 5,632,646 | $214M | 16.6% | 2026-Q2 |
| Copeland Capital Management, LLC added | 2,016,873 | $77M | 5.9% | 2026-Q2 |
| Jupiter Topco LLC new | 1,682,208 | $64M | 4.9% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 1,526,818 | $58M | 4.5% | 2026-Q2 |
| STATE STREET CORP added | 1,504,759 | $57M | 4.4% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 1,494,431 | $57M | 4.4% | 2026-Q2 |
| FIRST TRUST ADVISORS LP added | 1,304,074 | $50M | 3.8% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 1,196,951 | $45M | 3.5% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP added | 1,102,280 | $42M | 3.2% | 2026-Q2 |
| MORGAN STANLEY added | 959,777 | $36M | 2.8% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 725,550 | $28M | 2.1% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP trimmed | 697,937 | $27M | 2.1% | 2026-Q2 |
| Doma Perpetual Capital Management LLC | 627,931 | $24M | 1.8% | 2026-Q2 |
| NORTHERN TRUST CORP added | 610,616 | $23M | 1.8% | 2026-Q2 |
| Fundsmith LLP added | 606,974 | $23M | 1.8% | 2026-Q2 |
| DEPRINCE RACE & ZOLLO INC added | 408,632 | $16M | 1.2% | 2026-Q2 |
| ROYAL BANK OF CANADA trimmed | 406,408 | $15M | 1.2% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 406,200 | $15M | 1.2% | 2026-Q2 |
| Point72 Asset Management, L.P. trimmed | 379,686 | $14M | 1.1% | 2026-Q2 |
| ENVESTNET ASSET MANAGEMENT INC added | 378,803 | $14M | 1.1% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 369,290 | $14M | 1.1% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 354,531 | $13M | 1.0% | 2026-Q2 |
| Bank of New York Mellon Corp added | 311,009 | $12M | 0.9% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 295,923 | $11M | 0.9% | 2026-Q2 |
| CONGRESS ASSET MANAGEMENT CO added | 285,462 | $11M | 0.8% | 2026-Q2 |
| CAPTRUST FINANCIAL ADVISORS added | 278,678 | $11M | 0.8% | 2026-Q2 |
| FEDERATED HERMES, INC. added | 277,694 | $11M | 0.8% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC trimmed | 274,820 | $10M | 0.8% | 2026-Q2 |
| LOS ANGELES CAPITAL MANAGEMENT LLC added | 274,050 | $10M | 0.8% | 2026-Q2 |
| Granite Investment Partners, LLC trimmed | 266,069 | $10M | 0.8% | 2026-Q2 |
| Visionary Wealth Advisors trimmed | 262,368 | $10M | 0.8% | 2026-Q2 |
| Trexquant Investment LP added | 261,334 | $10M | 0.8% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 256,442 | $10M | 0.8% | 2026-Q2 |
| Nuveen, LLC added | 255,569 | $10M | 0.8% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 254,169 | $10M | 0.7% | 2026-Q2 |
| WASATCH ADVISORS LP | 242,585 | $9M | 0.7% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC added | 230,017 | $9M | 0.7% | 2026-Q2 |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND added | 224,298 | $9M | 0.7% | 2026-Q2 |
| CRAWFORD INVESTMENT COUNSEL INC added | 223,794 | $8M | 0.7% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 214,871 | $8M | 0.6% | 2026-Q2 |
| JACOBS LEVY EQUITY MANAGEMENT, INC trimmed | 201,670 | $8M | 0.6% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 196,242 | $7M | 0.6% | 2026-Q2 |
| Invesco Ltd. added | 190,854 | $7M | 0.6% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND added | 186,274 | $7M | 0.5% | 2026-Q2 |
| GAMCO INVESTORS, INC. ET AL | 178,900 | $7M | 0.5% | 2026-Q2 |
| Rockefeller Capital Management L.P. added | 178,187 | $7M | 0.5% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP added | 172,667 | $7M | 0.5% | 2026-Q2 |
| SG Capital Management LLC added | 170,793 | $6M | 0.5% | 2026-Q2 |
| KORNITZER CAPITAL MANAGEMENT INC /KS trimmed | 168,717 | $6M | 0.5% | 2026-Q2 |
| UBS Group AG added | 167,284 | $6M | 0.5% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 158,484 | $6M | 0.5% | 2026-Q2 |
| RICE HALL JAMES & ASSOCIATES, LLC added | 153,577 | $6M | 0.5% | 2026-Q2 |
| Public Sector Pension Investment Board added | 153,239 | $6M | 0.5% | 2026-Q2 |
| SEI INVESTMENTS CO added | 134,961 | $5M | 0.4% | 2026-Q2 |
| ISTHMUS PARTNERS, LLC added | 117,950 | $4M | 0.3% | 2026-Q2 |
| Redmond Asset Management, LLC trimmed | 117,784 | $4M | 0.3% | 2026-Q2 |
| ALTA CAPITAL MANAGEMENT LLC/ trimmed | 109,200 | $4M | 0.3% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 97,700 | $4M | 0.3% | 2026-Q2 |
| Vest Financial, LLC added | 96,069 | $4M | 0.3% | 2026-Q2 |
| PDT Partners, LLC trimmed | 93,227 | $4M | 0.3% | 2026-Q2 |
| STIFEL FINANCIAL CORP trimmed | 93,156 | $4M | 0.3% | 2026-Q2 |
| Legal & General Group Plc added | 84,279 | $3M | 0.2% | 2026-Q2 |
| Bridge City Capital, LLC added | 84,131 | $3M | 0.2% | 2026-Q2 |
| RHUMBLINE ADVISERS trimmed | 83,395 | $3M | 0.2% | 2026-Q2 |
| Linden Thomas Advisory Services, LLC added | 80,539 | $3M | 0.2% | 2026-Q2 |
| CANADA PENSION PLAN INVESTMENT BOARD trimmed | 71,300 | $3M | 0.2% | 2026-Q2 |
| Swiss National Bank trimmed | 70,000 | $3M | 0.2% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC added | 66,266 | $3M | 0.2% | 2026-Q2 |
| Allianz Asset Management GmbH | 60,650 | $2M | 0.2% | 2026-Q2 |
| Vident Advisory, LLC added | 60,130 | $2M | 0.2% | 2026-Q2 |
| Quantinno Capital Management LP added | 58,972 | $2M | 0.2% | 2026-Q2 |
| VICTORY CAPITAL MANAGEMENT INC added | 58,024 | $2M | 0.2% | 2026-Q2 |
| Engineers Gate Manager LP added | 55,530 | $2M | 0.2% | 2026-Q2 |
| Divisadero Street Capital Management, LP | 50,799 | $2M | 0.1% | 2026-Q2 |
| Corient Private Wealth LP added | 48,739 | $2M | 0.1% | 2026-Q2 |
| SEIZERT CAPITAL PARTNERS, LLC added | 48,631 | $2M | 0.1% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC added | 48,084 | $2M | 0.1% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 41,503 | $2M | 0.1% | 2026-Q2 |
| VIRGINIA RETIREMENT SYSTEMS ET Al added | 40,948 | $2M | 0.1% | 2026-Q2 |
| FIRST NATIONAL BANK OF OMAHA trimmed | 40,823 | $2M | 0.1% | 2026-Q2 |
| First National Advisers, LLC trimmed | 39,698 | $2M | 0.1% | 2026-Q2 |
| Gotham Asset Management, LLC trimmed | 39,438 | $1M | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 39,313 | $1M | 0.1% | 2026-Q2 |
| Hennion & Walsh Asset Management, Inc. added | 39,026 | $1M | 0.1% | 2026-Q2 |
| ALGERT GLOBAL LLC trimmed | 39,018 | $1M | 0.1% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 37,232 | $1M | 0.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. trimmed | 36,250 | $1M | 0.1% | 2026-Q2 |
| WINTON GROUP Ltd added | 34,239 | $1M | 0.1% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 34,030 | $1M | 0.1% | 2026-Q2 |
| CAPITAL FUND MANAGEMENT S.A. added | 33,487 | $1M | 0.1% | 2026-Q2 |
| BARCLAYS PLC added | 31,044 | $1M | 0.1% | 2026-Q2 |
| Zurcher Kantonalbank (Zurich Cantonalbank) added | 30,449 | $1M | 0.1% | 2026-Q2 |
| Creative Planning trimmed | 30,383 | $1M | 0.1% | 2026-Q2 |
| Magnetar Financial LLC added | 29,415 | $1M | 0.1% | 2026-Q2 |
| LPL Financial LLC trimmed | 27,686 | $1M | 0.1% | 2026-Q2 |
| Financiere des Professionnels - Fonds d'investissement inc. added | 27,528 | $1M | 0.1% | 2026-Q2 |
| Y-Intercept (Hong Kong) Ltd trimmed | 26,442 | $1M | 0.1% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 25,659 | $975K | 0.1% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd | 24,999 | $949K | 0.1% | 2026-Q2 |
| State of Tennessee, Department of Treasury added | 24,722 | $939K | 0.1% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.