Is Spirit AeroSystems Holdings, Inc. overvalued or undervalued?

As of 4 August 2020, the valuation grade for Spirit AeroSystems Holdings, Inc. moved from very attractive to risky, indicating a significant deterioration in its valuation outlook. The company appears to be overvalued given its negative P/E ratio, a price-to-book value of -1.88, and an EV to EBITDA of -6.62, which are concerning indicators of its financial health and performance.
In comparison to its peers, Spirit AeroSystems' valuation metrics are notably weaker; for instance, AeroVironment, Inc. has a P/E of 180.12, while Moog, Inc. has a fair valuation with a P/E of 40.73. Additionally, the company's recent stock performance has lagged behind the S&P 500, particularly over the 3-year and 5-year periods, where it returned 49.61% and 84.25% compared to the S&P 500's 70.41% and 96.61%, respectively. This underperformance reinforces the notion that Spirit AeroSystems is currently overvalued.