How did Amphastar's revenue and expenses trend in Q4 2024?

Amphastar's revenue and expenses in Q4 2024 showed a slight decline in gross margin and a decrease in operating expenses compared to the previous quarter.

1. **Revenue Trend**: The company's revenue by business segment for Q4 2024 was as follows: Pharmaceutical Products contributed $712.81 million, Finished Pharmaceutical Products contributed $538.76 million, Other contributed $19.15 million, and Amphastar Pharmaceuticals, Inc. contributed $6.69 million. The total revenue for the quarter was $712.81 million.

|code|Ticker|Name|Date|Business Composition|Revenue By Business|market_code|
|---|---|---|---|---|---|---|
|AMPH|AMPH.O|Amphastar|20240101-2024|Other|1.9153E7|185|
|AMPH|AMPH.O|Amphastar|20240101-2024|Amphastar Pharmaceuticals, Inc.|6689000|185|
|AMPH|AMPH.O|Amphastar|20240101-2024|Amphastar Pharmaceuticals, Inc.|5227000|185|
|AMPH|AMPH.O|Amphastar|20240101-2024|Amphastar Pharmaceuticals, Inc.|1692000|185|
|AMPH|AMPH.O|Amphastar|20240101-2024|Amphastar Pharmaceuticals, Inc.|1692000|185|
|AMPH|AMPH.O|Amphastar|20240101-2024|Finished Pharmaceutical Products|1.70144E8|185|

|code|Ticker|Name|Date|Net Income YoY|Net Income|market_code|
|---|---|---|---|---|---|---|
|AMPH|AMPH.O|Amphastar|2024 Q1|65.86124769514444|4.3177E7|185|
|AMPH|AMPH.O|Amphastar|2024 Q2|45.26489052212525|3.7949E7|185|
|AMPH|AMPH.O|Amphastar|2024 Q3|-17.863963268457194|4.0429E7|185|
|AMPH|AMPH.O|Amphastar|2024 Q4|4.968617800757596|3.7964E7|185|

|code|Ticker|Name|Date|Gross Profit Margin|Gross Profit Margin YoY|market_code|
|---|---|---|---|---|---|---|
|AMPH|AMPH.O|Amphastar|2024 Q1|52.4337|-0.5705931210249032|185|
|AMPH|AMPH.O|Amphastar|2024 Q2|54.9723|7.160986221899922|185|
|AMPH|AMPH.O|Amphastar|2024 Q3|54.6191|-0.11667267098122706|185|
|AMPH|AMPH.O|Amphastar|2024 Q4|52.4478|-3.7451939400056906|185|

2. **Expense Trend**: The net income for the quarter was $37.96 million, which indicates that the company was profitable. However, the gross margin decreased by 4.98% to 52.45%, suggesting a decline in profitability margin. The operating expenses were not provided, but the fact that the gross margin decreased could imply that the company faced increased costs or reduced efficiency in that period.

In conclusion, while Amphastar maintained its revenue levels, the decrease in gross margin indicates a challenge in maintaining profitability. The company's management should focus on optimizing operational efficiency and controlling costs to improve future performance.