One who or that which underperforms, having performance that is below average or below expectations; often specifically a company or stock

plural of underperformer

To underachieve; to fail to reach standards or expectations, especially with respect to a financial investment.

present participle of underperform

That performs less well than required.

Third-person singular simple present indicative form of underperform

simple past tense and past participle of underperform

The state or quality of underperforming

plural of underperformance