Security & Protection Services Stocks in the US

The largest Security & Protection Services stocks in the US by market value are Allegion plc ($16.2B), ADT Inc. ($7.2B) and MSA Safety Incorporated ($6.8B), at prices of 4 Nov 2026.

• Allegion plc: $192.69 | market value $16.2B | P/E 18.9
• ADT Inc.: $9.90 | market value $7.2B | P/E 8.4
• MSA Safety Incorporated: $177.60 | market value $6.8B | P/E 21.5
• The Brink's Company: $113.02 | market value $4.7B | P/E 21.5
• Brady Corporation: $82.84 | market value $3.9B | P/E 21.7
• The GEO Group, Inc.: $27.53 | market value $3.6B | P/E 13.3
• CoreCivic, Inc.: $30.52 | market value $3.0B | P/E 23.5
• Napco Security Technologies, Inc.: $31.75 | market value $1.1B | P/E 31.5
• Evolv Technologies Holdings, Inc.: $4.81 | market value $871M
• Mistras Group, Inc.: $20.23 | market value $645M | P/E 20.6

The other 4 Security & Protection Services companies are in the full list below.

Share price | market value | P/E, biggest first. Prices and market values as of 4 Nov 2026; ratios as in the score list below.

Ranked by the 4-Factor Sector Score (growth & earnings 35, capital efficiency 25, valuation 20, relative strength 20). Prices as of 4 Nov 2026.

All 14 listed US Security & Protection Services companies are named here, largest first. Every figure is equal-weighted across those companies and carries its own as-of date. One large company cannot set the reading.

1. Allegion plc$16.2B
2. ADT Inc.$7.2B
3. MSA Safety Incorporated$6.8B
4. The Brink's Company$4.7B
5. Brady Corporation$3.9B
6. The GEO Group, Inc.$3.6B
7. CoreCivic, Inc.$3.0B
8. Napco Security Technologies, Inc.$1.1B
9. Evolv Technologies Holdings, Inc.$871M
10. Mistras Group, Inc.$645M
11. CompX International Inc.$458M
12. NLI Holdings, Inc.$360M
13. Bridger Aerospace Group Holdings, Inc.$97M
14. Concorde International Group Ltd.$94M

12 Security & Protection Services companies in the Security & Protection Services industry group (every listed company) have a page on Sector Alpha, by market value as of 4 November 2026, and all 12 are listed below, largest first. The largest is Allegion plc ($16.2 billion) and the smallest with a market value is NLI Holdings, Inc.

Download all 12 Security & Protection Services companies (CSV)

The line below covers up to 5.2 years and opens on the 5Y view; the buttons cut it shorter. Over the last two years (104 weeks) this industry is 4% ahead of S&P 500. Earnings across its companies grew 10% on average over the last four reported quarters. It has been ahead of S&P 500 on a rolling three-month view for 19 weeks running.

5 of the 12 companies with a long enough price record ahead of S&P 500 by 5% or more over three months.

Ahead of S&P 500 on the three-month view for 19 weeks running; 8 of the 12 companies in the industry index above their 200-day average (1 more than four weeks earlier); 5 of those 12 ahead of S&P 500 by 5% or more over three months (1 more than four weeks earlier); earnings rising at 10 of the 12 that report earnings.

Ahead of S&P 500 for 19 weeks running and +13.3% over a year, with 4 → 5 of 12 stocks participating. Earnings confirming, 10 of 12 members have higher trailing twelve-month earnings than a year ago.

Both lines start at 200 in the same week, so the gap between them tells the story: the industry line is an equal-weighted index of 12 of its 14 companies (the 2 with too short a price record are ranked in the scorecard but cannot sit in this line). The bars underneath are trailing 12-month earnings per share, one bar per reported quarter, each member set to 100 at the start and the industry taking the middle value, so a price line pulling away from flat bars means the market is paying more for the same earnings. A bar turns grey when that figure is lower than the quarter before. The rules are fixed and the same everywhere on this site: ahead by 5% or more over three months, or behind by 20% or more over a year while earnings grew 20% or more. Hover or tap any point to read both values and the gap.

Security & Protection Services has done better than the S&P 500 by 5.5% over the last 52 weeks. Over 13 weeks the gap is a lead of 2.8%. CompX International Inc. is the strongest against the sector itself at +23.9%.

Security & Protection Services has done better than the S&P 500 by 5.5% over 52 weeks and by 2.8% over 13 weeks. 7 of 14 companies we track are beating the S&P 500 on relative strength (how a share price has done against the index over recent months) (2 have no relative-strength reading yet), and 7 of the 12 with a long enough price history are ahead of the industry itself.

A score that ranks each company against the others in its industry. The four parts shown always add up to the total: Growth & earnings (35), Capital efficiency (25), Valuation (20), and Relative strength (20). Missing or old evidence affects only its own part, never as a hidden adjustment.

CompX International Inc. has the strongest current balance of earnings trajectory, business quality, valuation and price confirmation, with 81.1% evidence confidence.

Ranked last: too little evidence (2 companies)

Under 60% of the evidence behind these scores is available, so they rank after every company above, whatever the score.

The GEO Group, Inc. has the strongest one-year price move in Security & Protection Services at +82.0%. CompX International Inc. leads on relative strength against the S&P 500, at +29.7%. 7 of 14 companies we track are ahead of the index on that measure (2 have no relative-strength reading yet). Every line covers 314 weekly closes through 4 November 2026.

Price and relative strength

Price · same starting point: Every company, the sector's own index and S&P 500 all start level on the left edge of the window, so only the distance between the lines counts: the highest line has risen the most since then, and the chart at the top of this page is drawn the same way. It opens on one year; the buttons beside it stretch that to three or five.

RS vs S&P 500: How far ahead of or behind S&P 500 each company has been running, measured against its own recent average of that comparison, so the flat line at zero IS S&P 500: above it the company is beating the market, below it the market is beating the company. It opens on one year.

RS vs sector: The same measure taken against Security & Protection Services itself instead of the whole market, so the flat line at zero is the sector: above it the company is beating its own peers, which is the sharper test of the two. It opens on one year.

Biggest one-year moves

Strongest against S&P 500

Strongest against the sector itself

The Brink's Company has the highest Revenue among the 14 Security & Protection Services companies compared here, at $5,481 million. ADT Inc. is next at $5,165 million. Evolv Technologies Holdings, Inc. has the highest Revenue growth at 42.1%, so level and change sit with different companies. 13 of 14 companies report a comparable reading, the latest through Jun 2026.

What the numbers say: The Brink's Company is the largest at $5,481 million, 6.1% ahead of ADT Inc. Evolv Technologies Holdings, Inc.'s growth is 42.1% from a $172 million base, with 19 reported quarters out of the last 20. Fast growth from a smaller base is not yet the same as proven size.

What this means: The Brink's Company is the size to compare against; Evolv Technologies Holdings, Inc. is the one growing fastest. The faster grower has to keep that growth and turn it into margin and returns before it counts as more than a fast start.

This conclusion weakens if: The Brink's Company's growth falls below Evolv Technologies Holdings, Inc.'s for two consecutive comparable reports while operating margin also compresses.

Revenue is compared on a common reported-currency basis. Growth is year-on-year, so seasonality does not masquerade as progress.

Revenue · company comparison

Revenue · largest

Revenue growth · fastest growers

All-company data · latest reported quarter

In every all-company table on this page, each figure is the company’s latest single reported quarter. The rankings above them use trailing-twelve-month or current-market values, so a company can legitimately show a different number in each.

Revenue shows both size and speed. A large company can absorb shocks and pay for wide distribution; faster growth can mean market-share gains, new capacity or stronger demand. The best sign is usually growth that lasts without hurting margins and returns.

Napco Security Technologies, Inc. has the highest OPM among the 14 Security & Protection Services companies compared here, at 32.2%. MSA Safety Incorporated is next at 24.6%. Evolv Technologies Holdings, Inc. has the highest Margin change at +12.8 percentage points, so level and change sit with different companies. Its OPM series carries 19 reported observations across the 20-quarter window.

What the numbers say: Napco Security Technologies, Inc. leads opm at 32.2%; Evolv Technologies Holdings, Inc. leads margin change at +12.8 percentage points.

What this means: Napco Security Technologies, Inc. sets the level to compare against; the company improving fastest needs another report to confirm the change.

This conclusion weakens if: The next two comparable reports reverse the current margin change signal.

Operating margin compares operating profit with revenue. Improvement is measured in percentage points, not percentage growth.

Operating margin · company comparison

OPM · highest

Margin change · fastest expanders

All-company data · latest reported quarter

Allegion plc has the highest Net profit among the 14 Security & Protection Services companies compared here, at $692 million. ADT Inc. is next at $612 million. The GEO Group, Inc. has the highest Profit growth at the 100% top of the scoring scale, so level and change sit with different companies.

What the numbers say: Allegion plc earns the most, $692 million of profit over the last 12 months, 13.1% above ADT Inc. The GEO Group, Inc. shows at least 100% on the scoring scale (224.4% in full) growth from a profit base of $292 million. A fast rate from a small base matters less than a large profit that keeps coming.

What this means: Allegion plc sets the level to compare against; the company improving fastest needs another report to confirm the change.

This conclusion weakens if: The next two comparable reports reverse the current profit growth signal.

Net profit is the residual after operating costs, interest and tax. Growth off a loss or near-zero base is excluded from the fastest-grower rank.

Net profit · company comparison

Net profit · largest

Profit growth · fastest growers

All-company data · latest reported quarter

Napco Security Technologies, Inc. has the highest ROCE among the 14 Security & Protection Services companies compared here, at 31.2%. Allegion plc is next at 20.6%. Evolv Technologies Holdings, Inc. has the highest ROCE change at +18.3 percentage points, so level and change sit with different companies. 14 of 14 companies report a comparable reading, the latest through Jun 2026.

What the numbers say: Napco Security Technologies, Inc. leads ROCE at 31.2%, 10.6 percentage points above Allegion plc. A high return reported once may be one good year; a high return reported year after year shows a lasting business.

What this means: Napco Security Technologies, Inc. sets the level to compare against; the company improving fastest needs another report to confirm the change.

This conclusion weakens if: The next two comparable reports reverse the current roce change signal.

ROCE asks how much operating return the business earns on the capital employed. Direction matters, but a single exceptional year should not be mistaken for durability.

Return on capital · company comparison

ROCE · highest

ROCE change · fastest improvers

All-company data · latest reported quarter

The GEO Group, Inc. has the lowest PEG among the 14 Security & Protection Services companies compared here, at 0.17×. Mistras Group, Inc. is next at 0.4×. Evolv Technologies Holdings, Inc. has the lowest P/E at −37.7×, so level and change sit with different companies. 10 of 14 companies report a comparable reading, the latest through Jun 2026.

What the numbers say: The GEO Group, Inc. has the lowest comparable PEG at 0.17×, 57.5% below Mistras Group, Inc. That would need today's multiple, the company's own history and steady growth to agree.

What this means: A low valuation is a reason to look closer at the business, not a conclusion on its own.

This conclusion weakens if: The next two comparable reports reverse the current p/e signal.

PEG is shown only when earnings are positive and three-year EPS growth is between 5% and 60%. It is worked out the same way every time, as the P/E on the last 12 months of reported earnings divided by that growth rate, never on expected earnings. On Indian companies it is shown only where the two data feeds agreed. Where any of that fails the ratio is left out rather than printed: a P/E divided by a loss, or by growth measured off a tiny base, is a number that looks precise and means nothing.

Valuation · company comparison

PEG · lowest PEG

P/E · lowest P/E

All-company data · latest reported quarter

This Security & Protection Services comparison names 5 specific ways its own evidence can mislead, all listed below. 1 of the 14 companies reports on an older date than the sector's freshest reporters, so its rank is marked stale. A high growth rate can still come from a very small starting figure.

Keep these limits visible

• A high growth rate can come from a very small starting figure. The page keeps level and change separate for that reason.
• A high ROCE can be temporary, or look high because the capital base is small. It is best read beside margin, cash flow and how much is spent back on the business.
• The 4-Factor Sector Score ranks published data only. Management quality, upcoming events and risks are not part of it.
• An “all companies” line chart preserves completeness, but rank changes should be checked against reporting dates before drawing a conclusion.
• 1 company has an older fundamental reporting date than the sector’s freshest reporters; its rank carries a stale marker.

This comparison is built from the reported filings of 14 Security & Protection Services companies, normalized to a common $ scale and a shared quarter axis of up to 20 quarters each. Fundamentals run through Sep 2026 and market data through 4 November 2026.

These 22 answers restate the Security & Protection Services comparison above in question form. Every one is computed from the same 14 companies and the same reported filings as the rankings and charts, current through Sep 2026. Price and relative-strength answers run through 4 November 2026. Nothing here is estimated, and none of it is a recommendation.