The Invesco QQQ Trust (NASDAQ: QQQ) is one of the most popular exchange-traded funds (ETFs). It aims to track the Nasdaq 100 index, which includes the 100 largest non-financial companies listed on the Nasdaq exchange. It contains a who's who of the technology sector, counting Microsoft, Apple, Nvidia, and Amazon among its top holdings. 

The Invesco QQQ Trust has many endearing features. However, there are two big reasons investors shouldn't buy this leading ETF right now.

Like the Nasdaq 100, the Invesco QQQ Trust holds 100 stocks (101 to be exact because Alphabet has two share classes). However, despite the appearances of diversification, the fund has a high concentration among its top holdings:

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Source Fool.com