How did Ambarella's revenue and expenses trend in Q4 2025?

**Ambarella's revenue and expenses in Q4 2025 showed notable increases in revenue with a slight rise in expenses**:

1. **Revenue Trend**: Ambarella's revenue for the fourth quarter of fiscal 2025 was $84.0 million. This represents a significant increase of 62.8% compared to the same period in fiscal 2024, where revenue was $51.6 million. The fiscal year ended January 31, 2025, saw a total revenue of $284.9 million, marking a 25.8% increase from the previous fiscal year's $226.5 million.

|code|Ticker|Name|Date|Selling, General, and Administrative Expenses|R&D Expenses|Advertising and Marketing Expenses|market_code|
|---|---|---|---|---|---|---|---|
|AMBA|AMBA.O|Ambarella|2025 Q1|1.8468E7|5.4137E7||185|
|AMBA|AMBA.O|Ambarella|2025 Q2|1.8268E7|5.676E7||185|
|AMBA|AMBA.O|Ambarella|2025 Q3|1.7169E7|5.8389E7||185|
|AMBA|AMBA.O|Ambarella|2025 Q4|1.8911E7|5.6823E7||185|

2. **Expense Trend**: The company's gross margin under GAAP for the fourth quarter of fiscal 2025 was 60.0%, an increase from the 59.8% recorded in the same period of fiscal 2024. For the fiscal year ended January 31, 2025, the GAAP gross margin was 60.5%, up from 60.4% in the previous fiscal year.
3. **Net Loss**: Ambarella reported a GAAP net loss of $20.2 million for the fourth quarter of fiscal 2025, resulting in a loss per diluted ordinary share of $0.48. This compares favorably to the net loss of $60.6 million, or loss per diluted ordinary share of $1.50, in the same period of fiscal 2024. For the fiscal year ended January 31, 2025, the GAAP net loss was $117.1 million, or loss per diluted ordinary share of $2.84, improved from the fiscal year ended January 31, 2024, where the net loss was $169.4 million, or loss per diluted ordinary share of $4.25.
4. **Non-GAAP Performance**: On a non-GAAP basis, Ambarella's gross margin for the fourth quarter of fiscal 2025 was 62.0%, slightly lower than the 62.5% recorded in the same period of fiscal 2024. For the fiscal year ended January 31, 2025, the non-GAAP gross margin was 62.7%, down from 63.3% in the previous fiscal year. The non-GAAP net profit for the fourth quarter was $4.8 million, or earnings per diluted ordinary share of $0.11, compared to a non-GAAP net loss of $9.8 million, or loss per diluted ordinary share of $0.24, in the same period of fiscal 2024.

In conclusion, Ambarella experienced robust revenue growth in Q4 2025, accompanied by improved gross margins and a significant reduction in net losses compared to the previous year's fourth quarter. However, certain expenses, particularly R&D costs, continued to be substantial, indicating the company's ongoing investment in innovation and product development.