Shares of CATL plunged 10% on its Bangkok-listed depositary receipts after the world's largest EV battery maker delivered a third quarter that grew fast on the top line but stumbled where it counts most: the bottom line. Net income rose just 15% year-on-year to 21.25 billion yuan ($3.2 billion), badly missing the 26 billion yuan average analyst estimate compiled by Bloomberg.

Revenue climbed 58.6% to 165.2 billion yuan but still undershot forecasts calling for a 60.2% increase. The gap between surging sales and sluggish earnings tells a clear story: CATL is selling more batteries than ever, but each one is making less money.

  • Costs Are Growing Faster Than Sales — And That's a Problem

Cost of sales rose 61.6% in the first nine months, outpacing revenue growth of 56.2%.

Gross margin — the share of each dollar kept after production costs — fell to 22.7% from 25.3% a year ago. For shareholders, this means the massive volume push is coming at the expense of profitability. Net profit per watt-hour of batteries shipped dropped from roughly ¥0.097 in Q2 to about ¥0.082 in Q3 , a decline that signals pricing pressure across the industry is squeezing per-unit economics.

  • China Market Share Is Slipping Even as Global Share Rises

CATL's share of China's power battery installations fell to 40.9% in September from 49.8% in January, while rival BYD climbed to 21.1% from 17.4%. Globally, however, CATL still commanded 39.4% of worldwide EV battery usage through August, up from 37.7% a year earlier. The domestic erosion matters because China is CATL's largest and most profitable market — losing ground at home pressures pricing power everywhere.

  • The Profit Slowdown Is the Worst in Two Years

Q3's 14.5% profit growth follows a 36.5% rise in Q2 and marks the slowest expansion in nearly two years , coming as China's domestic auto market extended a 12-month sales downturn. Sequentially, net profit actually fell 5.8% from Q2 , undermining the narrative that seasonal demand lifts would help.

  • New Products Can't Paper Over Pricing Realities CATL unveiled next-generation truck batteries and battery-swapping network plans alongside earnings, but these forward-looking initiatives do little to address the immediate margin squeeze. R&D spending rose 22.9% to 18.5 billion yuan through nine months — necessary for competitiveness, but another headwind for near-term earnings. With the stock down 24% over the past year, investors are asking a fundamental question: is CATL becoming a high-volume, low-margin commodity business?