In 2015, the United States stock market experienced a remarkable surge, with its total market capitalization reaching unprecedented heights. This article delves into the factors that contributed to this growth and provides a comprehensive overview of the US stock market's capitalization in 2015.
Economic Factors Driving the Market
Several economic factors played a crucial role in the growth of the US stock market in 2015. One of the primary drivers was the Federal Reserve's decision to raise interest rates, signaling a recovering economy. This move encouraged investors to shift their focus from bonds to stocks, boosting market capitalization.
Corporate Earnings and Stock Buybacks
Another significant factor was the strong performance of corporate earnings. Many companies reported record-breaking profits, attributing to their ability to innovate and expand their market share. Additionally, companies engaged in substantial stock buybacks, further increasing the demand for their shares and driving up market capitalization.

Sector Performance
In 2015, certain sectors outperformed others, contributing to the overall growth of the market. The technology sector, in particular, experienced significant growth, driven by companies like Apple, Google, and Facebook. The energy sector, however, faced challenges due to falling oil prices, which impacted the market capitalization of major oil companies.
Key Market Indices
The performance of key market indices in 2015 reflected the overall growth of the US stock market. The S&P 500, for instance, reached an all-time high, with its total market capitalization exceeding $20 trillion. The NASDAQ Composite also saw substantial growth, driven by the technology sector.
Case Study: Apple Inc.
One notable case study is Apple Inc., which played a significant role in the growth of the US stock market in 2015. The company reported record-breaking profits and engaged in substantial stock buybacks, which contributed to its market capitalization reaching an all-time high of approximately $700 billion.
Conclusion
In conclusion, the total US stock market capitalization in 2015 reached unprecedented levels, driven by a combination of economic factors, corporate earnings, and sector performance. The growth of the market was a testament to the resilience and innovation of the US economy. As investors continue to monitor the market, it will be interesting to see how these factors evolve and impact the future of the US stock market.
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