--- title: "Southern Takes Over #103 Spot From Comcast" type: "News" locale: "en" url: "https://longbridge.com/en/news/279848553.md" description: "Southern Company (SO) has surpassed Comcast Corp (CMCSA) to claim the #103 position in the S&P 500 based on market capitalization, now valued at $106.30 billion compared to Comcast's $102.52 billion. Market capitalization is crucial for investors as it provides a true comparison of company values, influencing mutual fund and ETF investments. On the trading day, SO's stock fell by 0.3%, while CMCSA's rose by 1.4%." datetime: "2026-03-19T21:05:33.000Z" locales: - [zh-CN](https://longbridge.com/zh-CN/news/279848553.md) - [en](https://longbridge.com/en/news/279848553.md) - [zh-HK](https://longbridge.com/zh-HK/news/279848553.md) --- # Southern Takes Over #103 Spot From Comcast In the latest look at the underlying components of the S&P 500 ordered by largest market capitalization, Southern Company (Symbol: SO) has taken over the #103 spot from Comcast Corp (Symbol: CMCSA), according to The Online Investor. Market capitalization is an important data point for investors to keep an eye on, for various reasons. The most basic reason is that it gives a true comparison of the value attributed by the stock market to a given company's stock. Many beginning investors look at one stock trading at $10 and another trading at $20 and mistakenly think the latter company is worth twice as much — that of course is a completely meaningless comparison without knowing how many shares of each company exist. But comparing market capitalization (factoring in those share counts) creates a true "apples-to-apples" comparison of the value of two stocks. In the case of Southern Company (Symbol: SO), the market cap is now $106.30 billion, versus Comcast Corp (Symbol: CMCSA) at $102.52 billion. Below is a chart of Southern Company versus Comcast Corp plotting their respective size rank within the S&P 500 over time (SO plotted in blue; CMCSA plotted in green): Below is a three month price history chart comparing the stock performance of SO vs. CMCSA: Another reason market capitalization is important is where it places a company in terms of its size tier in relation to peers — much like the way a mid-size sedan is typically compared to other mid-size sedans (and not SUV's). This can have a direct impact on which mutual funds and ETFs are willing to own the stock. For instance, a mutual fund that is focused solely on Large Cap stocks may for example only be interested in those companies sized $10 billion or larger. Another illustrative example is the S&P MidCap index which essentially takes the S&P 500 index and "tosses out" the biggest 100 companies so as to focus solely on the 400 smaller "up-and-comers" (which in the right environment can outperform their larger rivals). So a company's market cap, especially in relation to other companies, carries great importance, and for this reason we at The Online Investor find value to putting together these rankings daily. Examine the full SO market cap history vs. the full CMCSA market cap history. At the closing bell, SO is down about 0.3%, while CMCSA is up about 1.4% on the day Thursday. The 20 Largest U.S. Companies By Market Capitalization » ##### Also see: • Top Stocks Held By Victor Mashaal • Funds Holding AREN • Top Stocks Held By Chase Coleman The views and opinions expressed herein are the views and opinions of the author and do not necessarily reflect those of Nasdaq, Inc. ### Related Stocks - [CMCSA.US](https://longbridge.com/en/quote/CMCSA.US.md) - [IVV.US](https://longbridge.com/en/quote/IVV.US.md) - [IXP.US](https://longbridge.com/en/quote/IXP.US.md) - [.SPX.US](https://longbridge.com/en/quote/.SPX.US.md) - [XTL.US](https://longbridge.com/en/quote/XTL.US.md) - [XLU.US](https://longbridge.com/en/quote/XLU.US.md) - [IYZ.US](https://longbridge.com/en/quote/IYZ.US.md) - [XLC.US](https://longbridge.com/en/quote/XLC.US.md) - [SO.US](https://longbridge.com/en/quote/SO.US.md) - [UTSL.US](https://longbridge.com/en/quote/UTSL.US.md) - [VOX.US](https://longbridge.com/en/quote/VOX.US.md) - [SPY.US](https://longbridge.com/en/quote/SPY.US.md) - [VOO.US](https://longbridge.com/en/quote/VOO.US.md) - [JXI.US](https://longbridge.com/en/quote/JXI.US.md) ## Related News & Research - [Comcast Trades at Just 8 Times Earnings After Losing 711,000 Broadband Subs Last Year](https://longbridge.com/en/news/283393576.md) - [Comcast Business Unveils Innovation Lab, Collaborating with Global Technology Leaders to Scale Next-Gen Enterprise Solutions | CMCSA Stock News](https://longbridge.com/en/news/283041767.md) - [Comcast expands Xfinity broadband to Adrian, Archie and Butler, Missouri](https://longbridge.com/en/news/283506312.md) - [Xfinity Data Breach Settled, Comcast Stock (NASDAQ:CMCSA) Gains in Response](https://longbridge.com/en/news/282725403.md) - [$117.5M Comcast settlement offers payouts after 2023 data breach: What to know](https://longbridge.com/en/news/282877170.md)