Instacart's involvement in this partnership could positively impact its brand image and market position by showcasing its commitment to social responsibility and leveraging its technology for a significant cause. This move might attract positive attention from investors and customers, potentially leading to a short-term positive impact on its stock price.

This partnership could enhance Quest Diagnostics' corporate image and potentially open new revenue streams through Pack Health. The focus on underserved communities aligns with increasing corporate responsibility trends, likely positively impacting investor perception and possibly the stock price in the short term.