If Sales to Stock Price increases over time:
An increasing Sales to Stock Price ratio is usually negative sign, indicating that sales increased, but the stock price did not increase as much.
If Sales to Stock Price decreases over time:
A decreasing Sales to Stock Price ratio is usually positive sign, indicating that sales decreased, but the stock price did not decrease as much.
If Sales to Stock Price stays the same over time:
An unchanged Sales to Stock Price ratio may indicate the proportion of sales to the stock price has not changed much.