Marvin Stock Watch guide

Top 15 Electrical Equipment & Parts Stocks

Marvin's rules rank 15 electrical equipment & parts stocks above about $300 million in size by Overall score. American Superconductor, AMETEK and Vertiv lead, while the lowest-ranked names show losses or heavy debt.

Updated 2026-10-22 · 15 stocks · Scores are Marvin's own

Electrical equipment & parts companies make the gear that generates, stores, controls and delivers power. That includes batteries, switchgear, lighting, connectors, cooling systems and fuel cells. This list shows the 15 companies in that industry that Marvin's rules rank highest.

The group is mixed. Some companies earn high margins and carry little debt, while others are young, growing fast and still losing money. Read each pick's figures, not just its rank, and pay attention to the caution attached to each one.

Scores here describe how a company compares with others in its industry today. They are not forecasts and not advice to buy or sell.

The list

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How Marvin ranked these stocks

Marvin included companies above about $300 million in size and ranked them by Marvin scores, which run from 0 to 100. The list covers the Electrical Equipment & Parts industry, with the highest Overall score first. Each score is relative to the company's own industry, so a high score means a company looks strong compared with its industry peers, not compared with every stock in the market.

Companies above about $300 million in size, ranked by Marvin scores (0-100, relative to each company's own industry). The Electrical Equipment & Parts industry, highest Overall score first.

The stocks, one by one

American Superconductor Corporation AMSC

Industrials · Electrical Equipment & Parts
Overall 95 Business 85 Opportunity 91

American Superconductor has an overall score of 95 and grew revenue 34.3% in the last fiscal year, a fast pace. Caution: its operating margin of 4.9% is thin, so profits are small compared with sales, and debt-to-equity data is not available.

AMETEK, Inc. AME

Industrials · Electrical Equipment & Parts
Overall 93 Business 97 Opportunity 55

AMETEK pairs a quality score of 97 with an operating margin of 25.9% and a free cash flow margin of 23.2%, pointing to strong profitability. Debt is low, with debt-to-equity of 0.21. Caution: revenue growth of 6.6% is modest.

Vertiv Holdings Co VRT

Industrials · Electrical Equipment & Parts
Overall 91 Business 91 Opportunity 73

Vertiv shows revenue growth of 27.7%, an operating margin of 18.9% and return on equity of 36.4%, a mix of quick expansion and solid profitability. Caution: debt-to-equity of 0.64 is higher than AMETEK's 0.21.

EnerSys ENS

Industrials · Electrical Equipment & Parts
Overall 86 Business 82 Opportunity 81

EnerSys has a free cash flow margin of 18.9% and an operating margin of 13.0%, suggesting healthy cash generation. Debt-to-equity of 0.53 is moderate. Caution: revenue growth of 3.7% was slow in the last fiscal year.

Acuity Brands, Inc. AYI

Industrials · Electrical Equipment & Parts
Overall 84 Business 94 Opportunity 61

Acuity Brands has a high quality score of 94 and a gross margin of 49.3%, so it keeps a large share of each sale after direct costs. Debt is low, with debt-to-equity of 0.28. Caution: its opportunity score of 61 is only middling.

Hubbell Incorporated HUBB

Industrials · Electrical Equipment & Parts
Overall 82 Business 89 Opportunity 50

Hubbell offers an operating margin of 20.7% and return on equity of 24.0%, signs of a profitable business, plus a quality score of 89. Caution: revenue growth of 3.8% is slow, and its opportunity score is just 50.

LSI Industries Inc. LYTS

Industrials · Electrical Equipment & Parts
Overall 79 Business 75 Opportunity 70

LSI Industries grew revenue 20.2% in the last fiscal year and has an opportunity score of 70. Caution: its operating margin of 5.6% and return on equity of 6.3% are low, so profitability is thin.

Powell Industries, Inc. POWL

Industrials · Electrical Equipment & Parts
Overall 77 Business 80 Opportunity 59

Powell Industries pairs an operating margin of 19.7% with a free cash flow margin of 21.1% and return on equity of 25.2%, all strong profitability signs. Caution: growth of 9.1% is moderate, and debt-to-equity data is not available.

Hayward Holdings, Inc. HAYW

Industrials · Electrical Equipment & Parts
Overall 75 Business 87 Opportunity 48

Hayward has a gross margin of 48.1% and an operating margin of 21.1%, both healthy. Caution: its free cash flow margin of 7.0% and return on equity of 10.0% are noticeably weaker, so less of its profit turns into cash or shareholder returns.

ERock, Inc. EROC

Industrials · Electrical Equipment & Parts
Overall 88 Business 78 Opportunity 86

ERock has an overall score of 88, a quality score of 78 and low debt, with debt-to-equity of 0.12. Caution: Marvin has no growth, margin or return figures for this company, so the picture is incomplete and the scores deserve extra care.

Preformed Line Products Company PLPC

Industrials · Electrical Equipment & Parts
Overall 73 Business 73 Opportunity 66

Preformed Line Products carries very little debt, with debt-to-equity of 0.10, and grew revenue 12.7% in the last fiscal year. Caution: its operating margin of 9.0% and free cash flow margin of 4.7% are modest.

Bloom Energy Corporation BE

Industrials · Electrical Equipment & Parts
Overall 70 Business 68 Opportunity 75

Bloom Energy grew revenue 37.3% and has an opportunity score of 75. Caution: its operating margin of 0.5% is close to break-even, return on equity is only 1.1%, and debt-to-equity of 2.97 is high.

Energizer Holdings, Inc. ENR

Industrials · Electrical Equipment & Parts
Overall 66 Business 61 Opportunity 77

Energizer reports return on equity of 40.1% and a gross margin of 36.8%. Caution: debt-to-equity of 16.97 is very high, which can inflate return on equity, revenue growth of 2.3% is slow, and no operating margin figure is available.

T1 Energy Inc TE

Industrials · Electrical Equipment & Parts
Overall 64 Business 52 Opportunity 93

TE shows revenue growth of 25572.8%, an extreme figure to read with care, and an opportunity score of 93. Caution: its operating margin of -22.4% and free cash flow margin of -18.5% are negative, and debt-to-equity is 3.86.

Energy Vault Holdings, Inc. NRGV

Industrials · Electrical Equipment & Parts
Overall 57 Business 45 Opportunity 89

Energy Vault grew revenue 340.9% and has an opportunity score of 89. Caution: its operating margin of -32.8% and free cash flow margin of -64.1% are deeply negative, and debt-to-equity of 38.82 is very high.

Common questions

What does an electrical equipment & parts company do?

These companies make products used to generate, store, control and deliver electricity. Examples include batteries, power-distribution gear, lighting, connectors, cooling systems for power equipment and fuel cells.

Why do some stocks on this list have negative margins?

A negative operating margin means a company spent more than it earned from its core business in the last fiscal year. This is common among young, fast-growing companies. In this list, TE and NRGV show negative margins, so they carry more risk than the profitable names.

Does a high Marvin score mean a stock is a good investment?

No. Marvin's scores only show how a company compares with others in its industry today. They do not predict future returns or say whether a stock's price is fair, so use them as a starting point for your own research.

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Marvin's scores (0-100) compare each company with others in its industry today. Growth and margin figures come from SEC filings. This is general information, not personal investment advice or a recommendation to buy or sell anything. Do your own research.