Marvin Stock Watch guide

Top 15 Auto Parts Stocks Ranked by Marvin Scores

Gentex, Standard Motor Products and XPEL lead Marvin's ranking of 15 auto parts stocks. The list is ordered by Overall score, which compares each company with others in the Auto - Parts industry today.

Updated 2026-10-25 · 15 stocks · Scores are Marvin's own

Auto parts companies make the components that go into new vehicles or that keep existing ones running. Some sell mainly to carmakers, while others sell replacement parts to repair shops and drivers. Their results can look quite different depending on which side of the business they lean on.

This list shows the 15 Auto - Parts stocks that Marvin's rules ranked highest by Overall score. Each entry gives a few figures, such as growth, margins and debt, so you can see what sits behind the score. A margin shows how much of each sales dollar a company keeps. Debt-to-equity shows how much a company borrows compared with what its owners have invested.

Keep in mind that the scores describe how a company compares with other auto parts companies today. They are not forecasts, and a high score does not mean a stock will rise. Some figures are missing for certain companies, and we point that out where it matters.

The list

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How Marvin ranked these stocks

Marvin included companies above a minimum size and ranked them by Overall score, with the highest first. Every score is relative to the company's own industry, so each stock here is compared only with other Auto - Parts companies, not with the whole market. The Overall score blends Marvin's quality and opportunity scores, which are also shown where useful.

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

The stocks, one by one

Gentex Corporation GNTX

Consumer Cyclical · Auto - Parts
Overall 95 Business 96 Opportunity 89

Gentex leads with an Overall score of 95 and a quality score of 96. An operating margin of 19.3% and a free cash flow margin of 18.9% suggest strong profitability. Growth of 9.6% is steady rather than fast, and debt data is not available.

Standard Motor Products, Inc. SMP

Consumer Cyclical · Auto - Parts
Overall 92 Business 83 Opportunity 96

Standard Motor Products grew revenue by 22.4% in its last fiscal year, the fastest pace among the leaders. Debt-to-equity of 0.97 is moderate. The caution is that its operating margin of 8.4% and free cash flow margin of 4.7% are fairly thin.

XPEL, Inc. XPEL

Consumer Cyclical · Auto - Parts
Overall 89 Business 93 Opportunity 79

XPEL combines a gross margin of 42.9% with growth of 13.3% and low debt, with a debt-to-equity ratio of 0.21. The caution is its free cash flow margin of -0.6%, which means it did not produce spare cash over the last fiscal year.

Garrett Motion Inc. GTX

Consumer Cyclical · Auto - Parts
Overall 86 Business 77 Opportunity 92

Garrett Motion has an Overall score of 86 and turns a good share of sales into free cash, with a free cash flow margin of 10.3%. Growth of 3.1% is slow, and figures for operating margin, return on equity and debt are missing.

Lear Corporation LEA

Consumer Cyclical · Auto - Parts
Overall 83 Business 74 Opportunity 86

Lear has an Overall score of 83, helped by an opportunity score of 86. Debt-to-equity of 0.68 is moderate. The caution is its thin profitability: a gross margin of 6.9%, an operating margin of 3.7%, and revenue growth of -0.2%.

Allison Transmission Holdings, Inc. ALSN

Consumer Cyclical · Auto - Parts
Overall 80 Business 86 Opportunity 70

Allison Transmission is highly profitable, with an operating margin of 19.6% and a return on equity of 26.7%. The cautions are that revenue changed by -6.7% last fiscal year, a decline, and that debt-to-equity of 2.13 is the higher side.

PHINIA Inc. PHIN

Consumer Cyclical · Auto - Parts
Overall 77 Business 71 Opportunity 82

PHINIA turns sales into cash fairly evenly, with an operating margin of 7.0% and a free cash flow margin of 6.9%. Debt-to-equity of 0.69 is moderate. The caution is modest growth of 2.4% and a return on equity of only 8.8%.

Dorman Products, Inc. DORM

Consumer Cyclical · Auto - Parts
Overall 71 Business 89 Opportunity 61

Dorman Products has a quality score of 89, backed by a gross margin of 42.3%, an operating margin of 14.5% and low debt-to-equity of 0.35. The caution is a lower opportunity score of 61, which pulls its Overall score down.

Atmus Filtration Technologies Inc. ATMU

Consumer Cyclical · Auto - Parts
Overall 74 Business 80 Opportunity 67

Atmus Filtration Technologies reports a return on equity of 47.3% and an operating margin of 17.2%, both strong. The caution is debt: its debt-to-equity ratio of 2.33 is high, and heavy borrowing can inflate return on equity. Growth was 5.7%.

LKQ Corporation LKQ

Consumer Cyclical · Auto - Parts
Overall 65 Business 53 Opportunity 76

LKQ has a gross margin of 38.3%, but much less of that reaches the bottom line, with an operating margin of 6.3%. The caution is that revenue changed by -1.2% last fiscal year, a small decline, and debt data is not available.

BorgWarner Inc. BWA

Consumer Cyclical · Auto - Parts
Overall 68 Business 68 Opportunity 73

BorgWarner has an Overall score of 68, with debt-to-equity of 0.72 and growth of 1.6%. The caution is its operating margin of 5.0% and return on equity of 7.4%, both modest. Free cash flow margin data is missing.

Visteon Corporation VC

Consumer Cyclical · Auto - Parts
Overall 59 Business 62 Opportunity 55

Visteon has a quality score of 62 and low debt, with a debt-to-equity ratio of 0.27. The cautions are that revenue changed by -2.5% last fiscal year, a decline, return on equity is only 8.9%, and margin figures are not available.

Miller Industries, Inc. MLR

Consumer Cyclical · Auto - Parts
Overall 55 Business 59 Opportunity 31

Miller Industries carries almost no debt, with a debt-to-equity ratio of 0.01, and a free cash flow margin of 14.6%. The big caution is that revenue changed by -37.2% last fiscal year, a sharp drop, and its opportunity score is only 31.

Genuine Parts Company GPC

Consumer Cyclical · Auto - Parts
Overall 52 Business 56 Opportunity 10

Genuine Parts has a gross margin of 36.9% and growth of 3.5%. The cautions are a return on equity of just 0.7%, debt-to-equity of 1.62, and a very low opportunity score of 10. Its operating margin is not available.

Gentherm Incorporated THRM

Consumer Cyclical · Auto - Parts
Overall 49 Business 50 Opportunity 19

Gentherm closes the list with an Overall score of 49 and low debt-to-equity of 0.45. The caution is thin profitability: an operating margin of 4.0%, a free cash flow margin of 2.6%, and an opportunity score of only 19.

Common questions

What does Marvin's Overall score mean?

It is a summary score that blends Marvin's quality and opportunity scores. A higher number means the company compares well with other companies in its own industry today. It is not a prediction of future performance.

Why are some figures missing for certain stocks?

Marvin only shows a figure when the underlying data is available. If a company did not report a number in a usable form, that figure is left out instead of guessed, so a few stocks here have gaps in margins or debt.

Does a high score mean I should buy the stock?

No. The scores only describe how a company compares with its industry peers right now. They do not say whether a stock will rise or fall, and they are not advice. Many investors also look at the business, the price and their own goals.

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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.