StockStory warns against investing in Asana (ASAN) due to low billings growth, customer retention issues, and software integration hurdles. Trading at $13.20 per share, it may not be a wise investment at 3.8x forward price-to-sales.

Clean Harbors (CLH) falls short with organic revenue growth, estimated sales growth, and lagging earnings per share. Trading at $205.12 per share with a 26.1x forward P/E, investors should be cautious before adding it to their portfolio.

Knowles (KN) faces challenges with declining sales, a smaller revenue base, and a low return on capital. With a risky outlook due to these factors, investors should carefully consider the potential risks before investing in this company.

Read more at Yahoo Finance: 3 Cash-Producing Stocks with Warning Signs