Business Insider·2025-12-22 16:52Core Insights - The Magnificent Seven, comprising Apple, Microsoft, Alphabet, Amazon, Nvidia, Meta, and Tesla, collectively hold a market value exceeding $20 trillion, marking them as some of the most powerful companies in history [1] - The Big Four accounting firms—PwC, Deloitte, EY, and KPMG—are responsible for auditing these companies, ensuring financial accountability and compliance with regulations [2] Company Summaries - Microsoft: Audited by Deloitte since its IPO in 1986, Microsoft paid $78.4 million for audit and other services in its 2025 fiscal year, with a current valuation of $3.61 trillion and a 15% stock increase year-to-date [4][5] - Apple: EY has been Apple's auditor since 2009, with audit fees rising from $25 million to $30 million in 2024. Apple is valued at approximately $4 trillion, with a 9% stock increase year-to-date [6] - Alphabet: Also audited by EY, Alphabet's audit fees decreased from $41 million to $6.5 million in 2024. The company is valued at $3.7 trillion, with a significant 62% stock increase year-to-date [7] - Amazon: EY has served as Amazon's auditor since 1996, with audit fees of $51 million for the 2024 fiscal year. Amazon's current valuation is $2.43 trillion, although its stock performance has lagged behind its peers [8][9] - Nvidia: Audited by PwC since 2004, Nvidia reported $10 million in audit fees for its 2025 fiscal year. The company reached a market cap of $4 trillion in 2025 [10] - Meta: EY has been Meta's auditor since 2007, with audit fees of $36.3 million for the 2024 fiscal year. Meta is valued at $1.66 trillion, with a 12.5% stock increase year-to-date [11][12] - Tesla: Audited by PwC since 2005, Tesla's stock has rebounded to a valuation of $1.6 trillion, with a 19% increase year-to-date despite facing challenges earlier in the year [13][14]