The full exercise of the $100M option to purchase additional notes by Parsons Corporation indicates a strong investor interest and confidence in the company's financial health and future prospects. This move could potentially enhance the company's financial flexibility and support its strategic growth initiatives, which might be viewed positively by the market. However, the impact on the stock price would also depend on the market's perception of the company's future debt servicing capabilities and the dilutive effect of the convertible notes.