For BYD investors, growing vehicle sales are a great sign, especially considering management has targeted overtaking Toyota as the world's top-selling automaker. But finding customers outside a fiercely competitive home market might be even more important.

The automaker's September vehicle sales increased approximately 17% year over year. That figure pales in comparison to its overseas shipments of passenger vehicles and pickups, however, which soared roughly 154%. That's a massive difference. One business is jogging along, while the other apparently found a pile of ice cold energy drinks.

For long-term investors, the overseas growth story deserves attention beyond another impressive sales headline.

The export growth story

BYD sold 463,561 vehicles globally during September. Overseas passenger-vehicle and pickup shipments reached 179,877, according to Reuters. At home, the picture is less rosy. BYD's domestic vehicle sales declined approximately 12.4% year over year during the third quarter, even as its global sales increased 18.8%. That makes overseas expansion more than a nice bonus for shareholders – it's helping pick up the slack.

In other words, those overseas shipments represented approximately 39% of its total vehicle sales. The categories differ slightly because total sales also include commercial vehicles, but the scale is clear: international business is already a major part of BYD's story.

The latest quarterly results reinforce that point. BYD's global vehicle sales increased 18.8% year over year to more than 1.32 million during the third quarter. Overseas shipments more than doubled, helping offset weaker sales in China. That difference matters greatly considering that BYD's home market, China, is still engulfed in a nasty price war that has previously pressured industry profitability.

International expansion gives BYD another source of customers when its domestic business struggles. Investors don't need China's market to cooperate perfectly for the company to find growth, but if and when BYD's home market turns around, the electric vehicle (EV) maker will really be firing on all cylinders – maybe that's a poor analogy considering it only sells EVs, oh well.

However, that also makes overseas execution increasingly important. What once might have looked like an additional growth opportunity is becoming a crucial part of keeping the broader business moving forward.

The growth is reaching earnings

BYD's third-quarter financial results, released Thursday, offered some positive takeaways for investors. Revenue increased 13.6% year over year to roughly 221.5 billion yuan, while net profit attributable to shareholders rose 28.1% to roughly 10 billion yuan. Those are company-wide results, so investors shouldn't credit overseas expansion for every improvement.

That said, growing international shipments alongside improving revenue and earnings is a far more appealing combination than sales records accompanied by deteriorating profits.

There is a catch, though. Building an international business requires money before shareholders can celebrate the payoff. BYD's inventory increased approximately 60% from the end of 2025 through September, while trade receivables rose roughly 53%. The company attributed those increases primarily to its growing overseas automotive business, including additional inventory preparation.

That doesn't automatically mean something is wrong. It does mean investors should watch whether expanding overseas sales ultimately turn into cash, rather than simply leaving more money tied up in vehicle inventory and payments owed to BYD.

What it all means

BYD's overseas growth gives shareholders a reason to look beyond the challenges in China. The company is finding enough international demand to make a meaningful difference to its overall sales trajectory. But overseas markets won't provide a permanent escape from the increasing competition in its home market. Other automakers want those customers too, and I've previously noted Tesla having much success with its exports to Europe as well.

The encouraging development is that BYD already has a sizable international business growing much faster than its overall vehicle sales. The next step is proving that expansion can support lasting earnings and healthy cash flow. Going forward, investors should keep an eye on overseas shipments alongside profitability, inventory, and receivables. Selling more vehicles around the world is impressive but bringing the money home is what makes the investment story more compelling.

Daniel Miller has no position in any of the stocks mentioned. The Motley Fool recommends BYD Company. The Motley Fool has a disclosure policy.

Disclaimer:This article represents the opinion of the author only. It does not represent the opinion of Webull, nor should it be viewed as an indication that Webull either agrees with or confirms the truthfulness or accuracy of the information. It should not be considered as investment advice from Webull or anyone else, nor should it be used as the basis of any investment decision.