Stock price when the opinion was issued
Basically the NASDAQ 100. Acts as a benchmark for a lot of people like himself. Extremely liquid. Trade, rather than invest. Top was around $550, and he thinks it will probably take out those highs before the end of the year.
Based on the look of the chart, he'd write calls against it with a strike of around $530-540. This way, you collect some premiums. If you don't want to get taken out, just keep rolling the strike price up.
In order, this basket holds Apple, Microsoft, Amazon, Nvidia and Meta as its top five holdings. All have outperformed in 2023, especially Nvidia. QQQ pays a dividend of 0.57%, but charges only a 0.2% MER. True to the stocks this basket holds, QQQ is no income name, but an ETF to trade when tech peaks and slides. On that note, consider this when the market declines a few more percentage points.