Although most stocks made forward progress in January, a few of them bucked the bigger trend for understandable reasons.

The Invesco QQQ Trust ( QQQ -1.26%) tracks the Nasdaq-100, and it's a popular exchange-traded fund (ETF) for many ...

The Nasdaq-100 should not be confused with the Nasdaq Composite® Index. The Nasdaq Composite Index represents every company ...

In early trading on Tuesday, shares of Palantir Technologies topped the list of the day's best performing components of the Nasdaq 100 index, trading up 24.7%. Year to date, Palantir Technologies ...

In early trading on Monday, shares of Idexx Laboratories, topped the list of the day's best performing components of the Nasdaq 100 index, trading up 10.3%. Year to date, Idexx Laboratories ...

Try it Now The Nasdaq-100 in 100 video series provides insights into the Nasdaq-100 Index® and its constituents, all in 100 seconds or less. Sign up for our newsletter to get the latest on the ...

In early trading on Thursday, shares of AstraZeneca topped the list of the day's best performing components of the Nasdaq 100 index, trading up 4.4%. Year to date, AstraZeneca registers a 13.0% gain.

In early trading on Friday, shares of Atlassian topped the list of the day's best performing components of the Nasdaq 100 index, trading up 18.0%. Year to date, Atlassian registers a 29.4% gain.

In early trading on Wednesday, shares of T-Mobile topped the list of the day's best performing components of the Nasdaq 100 index, trading up 6.8%. Year to date, T-Mobile registers a 6.9% gain.

But that wasn't the case for all of them. While the Nasdaq-100 index advanced 2.2% in January, a handful of its constituents (including a market favorite) lost quite a bit of ground. Here they are ...

An even more exclusive club is in the Nasdaq-100 index, which includes the largest nonfinancial stocks on the exchange. The Invesco QQQ Trust (NASDAQ: QQQ) tracks the Nasdaq-100, and it's a ...