On November 5, 2025, Microsoft and OpenAI announced a new agreement strengthening their partnership, with Microsoft holding a $135 billion investment in OpenAI Group PBC and securing extended exclusive IP rights and Azure API exclusivity until Artificial General Intelligence is achieved[1]. The deal also includes OpenAI contracting to purchase an incremental $250 billion of Azure services, and allows both companies more flexibility in pursuing AI development independently or with third parties. Despite this major AI partnership news, Microsoft shares traded lower, with the stock at $508.91 (-1.05%) as of 12:55 PM EST. The decline comes even as broader markets are up, suggesting investors may be taking profits or expressing caution after recent gains.