Why Amazon could be the next black swan for the market

Amazon appears untouchable.

It's rallied 37 percent this year, outperforming the market nearly fourfold. And a stunning quarter, reported last month, prompted nearly two dozen firms to up their price targets on the e-commerce giant; a handful of those newly minted price targets place the company north of the $1 trillion threshold.

But at this juncture, I suspect a black swan has taken flight. Just consider the stock's presence in so many passive vehicles.

An overwhelming passive presence

Amazon is a top holding in over 140 exchange-traded funds. A liquidity event for Amazon shares — perhaps triggered by issues related to the Trump administration's ordered review of the company's impact on the U.S. Postal Service — would create uncontrollable selling, in our view.

Zooming in further, around 40 ETFs hold Amazon within the top 5 percent. Look out below: This is a colossal failure of common sense.

A passive overdose

Investors have been stuffing themselves on a Thanksgiving feast full of technology stocks. Today, tech sector equities comprise nearly 30 percent of all large-cap mutual fund portfolios; this is an accident waiting to happen.

This represents the largest "overweight" relative to traditional benchmarks, relative to other large-cap sectors, in two decades. This represents, too, nothing more than a passive overdose on big tech, setting up large downside risk.

This development causes me to hearken back a decade.

Of course, who could possibly forget the great gorging on the financial sector heading into the crisis? Leading into 2007, banks and insurance companies comprised nearly 24 percent of the S&P 500. Today, the tech sector's large market weighing puts it up near 26 percent of the market's total capitalization.

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Trading Nation is a multimedia financial news program that shows investors and traders how to use the news of the day to their advantage. This is where experts from across the financial world – including macro strategists, technical analysts, stock-pickers, and traders who specialize in options, currencies, and fixed income – come together to find the best ways to capitalize on recent developments in the market. Trading Nation: Where headlines become opportunities.

Michael Santoli

Michael Santoli joined CNBC in October 2015 as a Senior Markets Commentator, based at the network's Global Headquarters in Englewood Cliffs, N.J.  Santoli brings his extensive markets expertise to CNBC's Business Day programming, with a regular appearance on CNBC's “Closing Bell (M-F, 3PM-5PM ET).   In addition, he contributes to CNBCand CNBC PRO, writing regular articles and creating original digital videos.

Previously, Santoli was a Senior Columnist at Yahoo Finance, where he wrote analysis and commentary on the stock market, corporate news and the economy. He also appeared on Yahoo Finance video programs, where he offered insights on the most important business stories of the day, and was a regular contributor to CNBC and other networks.

Follow Michael Santoli on Twitter @michaelsantoli

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