Key Highlights

● Alphabet, Amazon, Nvidia and Tesla each saw over 1 million Options contracts on Thursday.

● Alphabet closed at $283.82, erasing roughly $500 billion of market value.

● Amazon slid after-hours as EPS of $1.89 missed the $1.97 estimate.

● The VIX ticked up only to around 17.20, suggesting stock-specific focus.

Four of the market's most-watched stocks drew outsized action in the options pits on Thursday, as traders positioned around a historic Alphabet (NASDAQ:GOOGL) selloff, an Amazon (NASDAQ:AMZN) Earnings report and a broader debate over AI spending.

Four names, one crowded market

Options Volume told a story of its own on Thursday, October 29. Alphabet, Amazon, Nvidia (NASDAQ:NVDA) and Tesla (NASDAQ:TSLA) each saw more than 1 million options contracts change hands, according to market data. Options give traders the right to trade a stock at a set price, and they are used both to hedge existing positions and to make leveraged bets on big moves.

Each of the four had a different reason to attract that attention.

Alphabet: the epicenter

Alphabet was the obvious magnet. The Google parent closed at $283.82 from $324.89 a day earlier in its worst session since its 2004 IPO, erasing roughly $500 billion of market value. Its third-quarter Revenue of $127.58 billion and adjusted EPS of $2.67 both missed forecasts, and free Cash Flow turned negative at $9.07 billion.

One report noted that the stock would have needed to close near $274.75 to surpass Nvidia's record one-day loss of market value. It stopped short of that mark, but the swing still triggered heavy options activity as traders hedged and repositioned. Analyst reactions added fuel: one brokerage downgraded the stock to Market Perform, while another reiterated its Overweight rating, according to market data.

Amazon: the earnings bet

Amazon drew attention for a different reason: it was due to report after the bell. Event traders often use options to bet on the size of a post-earnings move. The stock slid to $243.79 in the regular session, then fell further in after-hours trading after its EPS of $1.89 missed the $1.97 estimate and its fourth-quarter sales guidance midpoint came in below consensus. AWS revenue of $46.0 billion, however, beat expectations.

Nvidia: the AI bellwether

Nvidia edged lower to close at $213.66. As the most prominent AI chip supplier, it sits at the heart of the debate over whether the big tech companies' spending will keep paying off. Another report also noted a Justice Department inquiry into its $12.93 billion Hugging Face acquisition. Semiconductors broadly slid, with the PHLX Semiconductor index ending a four-day winning streak.

Tesla: active without a catalyst

Tesla rounded out the group, though no company-specific news was found for the electric vehicle maker on Thursday. Its presence on the list reflects its long-standing popularity with active options traders rather than any single event, and it appeared to trade with the broad market.

What the volume says

Heavy single-stock options trading contrasted with calm elsewhere. The VIX, which reflects options on the S&P 500 as a whole, ticked up only to around 17.20, according to a market data snapshot, and stock market volume ran right at its 20-day average of about 17.09 billion shares. That suggests traders were focused on specific mega-caps rather than bracing for a broad market decline. More than 400 S&P 500 members rose on the day.

What to watch

Options activity in Amazon is likely to stay heavy as traders react to its report in Friday's regular session. Intel (NASDAQ:INTC), which plunged after hours on a weak fourth-quarter outlook, could join the most-active list. Friday is also the last trading day of October, a session when monthly positioning and the Employment Cost Index could add fresh crosscurrents for options traders.