The Trillion-Dollar Market Cap Club

 | Jan 28, 2020 02:35PM ET

There are a handful of stocks in which institutions and individual investors have recently piled into. This behavior is emblematic of all bull markets once they begin to hit the manic phase. Wall Street falls in love with a few high-growth darlings and takes their valuations up to the thermosphere.

If you add up the market capitalizations of just four stocks – Google (NASDAQ:Alphabet ), Apple (NASDAQ:AAPL), Microsoft (NASDAQ:MSFT) and Amazon (NASDAQ:AMZN) – their combined worth exceeds $5 trillion. If you throw in Facebook (NASDAQ:FB), you get the top-5 biggest firms by market capitalization and they compose an amazing 18% of the S&P 500. Another way of looking at this is that the market cap of a full 282 companies in the S&P 500 now equals the same as the top 5 behemoths.

Again, this is not dissimilar to what has occurred in past blow-off tops. Recall the NASDAQ internet craze in the late '90s and the Nifty Fifty bubble mania of the late '60s and early '70s. In the 694 days between January 11th, 1973, and December 6, 1974, the Dow Jones Industrial Average lost over 45% of its value, but many stocks in the Nifty Fifty fared much worse. The Dot.com disaster was even more dramatic. It caused 5 trillion dollars of equity to vanish and wiped-out nearly 80% of market value.

The Nifty 50 stocks were the fastest-growing companies on the planet in the latter half of the 1960s and became known as "one-decision" stocks. These were viable companies with real business models but became extremely over-priced and over-owned. Investors were lulled into the belief they could buy and hold this group of stocks forever. By 1972, the overall S&P 500 Index's P/E stood at 19. However, the Nifty Fifty's average P/E at that time was more than twice that at 42. When the inevitable crash arrived, stocks that were part of the Nifty Fifty fell much more than the overall market. For example, by the end of '74, Xerox (NYSE:XRX) fell 71 percent, while Avon and Polaroid plunged by 86 percent and 91 percent, respectively.

The years 1994 to 2000 marked a period of massive growth in the adoption of the internet, leading to a massive bubble in equities surrounding this technological revolution. This fostered an environment where investors overlooked traditional metrics, such as the price-earnings ratio. During this period, the Nasdaq Composite Index rose 400%, as its PE ratio soared to 200.

It's always the same story: near the end of a massive bull market, a relatively small number of stocks get taken to incredible heights by a public that is thirsty for some story to justify such lofty valuations that are far above fundamentals. This can be clearly proved by viewing the Market capitalization of the Wilshire 5000 as a percentage of GDP. Stock valuations have now reached at an all-time high. In fact, they are nearly twice as high as the historical average and even higher than the NASDAQ bubble peak!