Seven of India's top ten most-valued companies experienced a substantial collective drop in their market capitalization (M-Cap) by ₹3,63,412.18 crore, or ₹3.63 trillion, over the last week. This significant erosion was largely driven by a broader sell-off in the Indian equities market. Reliance Industries emerged as the biggest laggard, with its market valuation tumbling by ₹1.58 trillion to ₹19.96 trillion. Other major contributors to the M-Cap decline included India's largest private sector lender, HDFC Bank, which saw its valuation erode by ₹96,153.61 crore. Bharti Airtel's M-Cap also fell by ₹45,274.72 crore. Tata Consultancy Services (TCS), Infosys, Bajaj Finance, and Larsen & Toubro (L&T) were among the other key firms that witnessed a reduction in their market valuations. The downturn was primarily attributed to renewed US tariff concerns, anticipation surrounding the upcoming Q3 results season, and persistent foreign capital outflows. The benchmark BSE Sensex consequently declined by 2,185.77 points, or 2.54 percent, during the week, reflecting weak investor sentiment. While most top firms faced losses, some companies managed to buck the trend. ICICI Bank's valuation jumped by ₹34,901.81 crore, Hindustan Unilever added ₹6,097.19 crore, and State Bank of India's M-Cap rose by ₹599.99 crore. Despite the weekly losses, Reliance Industries maintained its position as India's most valued company. This market movement highlights the sensitivity of Indian equities to global economic signals and domestic earnings expectations.