AAON Inc's stock experienced a significant pre-market decline of 5.88% on Monday, as investors positioned themselves ahead of the company's scheduled quarterly earnings release.

The heating and cooling equipment manufacturer is set to report its fourth-quarter financial results before the market opens. According to earnings previews, analysts forecast AAON's fourth-quarter EPS at 43 cents, compared with 30 cents in the prior-year period, with an adjusted EPS forecast of 45 cents.

Pre-market trading often sees heightened volatility around earnings announcements as traders react to expectations and any early indications of performance. The sharp decline suggests some market participants may have concerns or are taking a cautious stance ahead of the official results.