Auto Parts Stocks in the US

The largest Auto Parts stocks in the US by market value are O'Reilly Automotive, Inc. ($74.3B), AutoZone, Inc. ($53.6B) and Magna International Inc. ($17.4B), at prices of 4 Nov 2026.

• O'Reilly Automotive, Inc.: $92.30 | market value $74.3B | P/E 28.8
• AutoZone, Inc.: $3,328.50 | market value $53.6B | P/E 18.8
• Magna International Inc.: $65.63 | market value $17.4B | P/E 23.5
• Genuine Parts Company: $126.40 | market value $17.4B | P/E 558.4
• BorgWarner Inc.: $50.40 | market value $10.1B | P/E 32.8
• Allison Transmission Holdings, Inc.: $120.52 | market value $10.0B | P/E 17.7
• Autoliv, Inc.: $125.68 | market value $9.1B | P/E 13.2
• Aptiv PLC: $43.26 | market value $8.8B | P/E 59
• Aurora Innovation, Inc.: $4.08 | market value $8.2B
• Lear Corporation: $118.70 | market value $5.7B | P/E 11.8

The other 19 Auto Parts 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.

The largest 15 of 29 listed US Auto Parts companies are named here; all 29 are ranked in the scorecard. Every figure is equal-weighted across those companies and carries its own as-of date. One large company cannot set the reading.

1. O'Reilly Automotive, Inc.$74.3B
2. AutoZone, Inc.$53.6B
3. Magna International Inc.$17.4B
4. Genuine Parts Company$17.4B
5. BorgWarner Inc.$10.1B
6. Allison Transmission Holdings, Inc.$10.0B
7. Autoliv, Inc.$9.1B
8. Aptiv PLC$8.8B
9. Aurora Innovation, Inc.$8.2B
10. Lear Corporation$5.7B
11. LKQ Corporation$5.3B
12. Modine Manufacturing Company$5.2B
13. Mobileye Global Inc.$4.5B
14. Gentex Corporation$4.4B
15. Dorman Products, Inc.$4.2B

The remaining 14 Auto Parts companies are named and ranked in the scorecard.

43 Auto Parts companies in the Auto Parts industry group (every listed company) have a page on Sector Alpha, by market value as of 4 November 2026, and all 43 are listed below, largest first. The largest is O'Reilly Automotive, Inc. ($74.3 billion) and the smallest with a market value is Stoneridge, Inc.

Download all 43 Auto Parts 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 2% behind S&P 500. Earnings across its companies fell 12% on average over the last four reported quarters.

3 of 42 companies ahead of S&P 500 by 5% or more over three months. 1 is 20% or more behind over a year while earnings grew 20% or more.

Not ahead of S&P 500 on the three-month view this week; 10 of the 42 companies in the industry index above their 200-day average (3 more than four weeks earlier); 3 of those 42 ahead of S&P 500 by 5% or more over three months (2 more than four weeks earlier); earnings rising at 21 of the 40 that report earnings.

Not ahead of S&P 500 yet, but 2 more stocks joined in four weeks, 1 → 3 of 42. Earnings mixed, 21 of 40 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 its 42 companies. 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.

Auto Parts has done worse than the S&P 500 by 16.9% over the last 52 weeks. Over 13 weeks the gap is a shortfall of 14.6%. Standard Motor Products, Inc. is the strongest against the sector itself at +31.2%.

Auto Parts has done worse than the S&P 500 by 16.9% over 52 weeks and by 14.6% over 13 weeks. 3 of 29 companies we track are beating the S&P 500 on relative strength (how a share price has done against the index over recent months) (1 has no relative-strength reading yet), and 13 of the 28 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.

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

Allison Transmission Holdings, Inc. scores well on valuation against its peers or its own history, but its earnings have not yet improved enough to back that up.

Ranked last: too little evidence (3 companies)

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

Allison Transmission Holdings, Inc. has the strongest one-year price move in Auto Parts at +47.1%. Standard Motor Products, Inc. leads on relative strength against the S&P 500, at +11.3%. 3 of 29 companies we track are ahead of the index on that measure (1 has 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 Auto Parts 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

Magna International Inc. has the highest Revenue among the 29 Auto Parts companies compared here, at $42,671 million. Genuine Parts Company is next at $25,332 million. Dauch Corporation has the highest Revenue growth at 41%, so level and change sit with different companies. 26 of 29 companies report a comparable reading, the latest through Jun 2026.

What the numbers say: Magna International Inc. is the largest at $42,671 million, 68.4% ahead of Genuine Parts Company. Dauch Corporation's growth is 41% from a $8,224 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: Magna International Inc. is the size to compare against; Dauch Corporation 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: Magna International Inc.'s growth falls below Dauch Corporation'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.

Dorman Products, Inc. has the highest OPM among the 29 Auto Parts companies compared here, at 23.6%. O'Reilly Automotive, Inc. is next at 20.2%. Aurora Innovation, Inc. has the highest Margin change at +9700 percentage points, so level and change sit with different companies. 27 of 29 companies report a comparable reading, the latest through Jun 2026.

What the numbers say: Dorman Products, Inc. leads opm at 23.6%; Aurora Innovation, Inc. leads margin change at +9700 percentage points.

What this means: Dorman Products, 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

O'Reilly Automotive, Inc. has the highest Net profit among the 29 Auto Parts companies compared here, at $2,650 million. AutoZone, Inc. is next at $2,573 million. BorgWarner Inc. has the highest Profit growth at 81.1%, so level and change sit with different companies. 27 of 29 companies report a comparable reading, the latest through Jun 2026.

What the numbers say: O'Reilly Automotive, Inc. earns the most, $2,650 million of profit over the last 12 months, 3% above AutoZone, Inc. BorgWarner Inc. shows 81.1% growth from a profit base of $478 million. A fast rate from a small base matters less than a large profit that keeps coming.

What this means: O'Reilly Automotive, 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 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

Garrett Motion Inc. has the highest ROCE among the 29 Auto Parts companies compared here, at 54.3%. O'Reilly Automotive, Inc. is next at 46.5%. The same company also has the highest ROCE change, at +9.4 percentage points. 29 of 29 companies report a comparable reading, the latest through Jun 2026.

What the numbers say: Garrett Motion Inc. leads ROCE at 54.3%, 7.8 percentage points above O'Reilly Automotive, Inc. A high return reported once may be one good year; a high return reported year after year shows a lasting business.

What this means: Garrett Motion 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

Magna International Inc. has the lowest PEG among the 29 Auto Parts companies compared here, at 0.38×. Standard Motor Products, Inc. is next at 0.59×. Mobileye Global Inc. has the lowest P/E at −1292.6×, so level and change sit with different companies. 17 of 29 companies report a comparable reading, the latest through Jun 2026.

What the numbers say: Magna International Inc. has the lowest comparable PEG at 0.38×, 35.6% below Standard Motor Products, 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