Among the underlying components of the Russell 3000 index, we saw noteworthy options trading volume today in ACELYRIN Inc (SLRN), where a total of 12,646 contracts have traded so far, representing approximately 1.3 million underlying shares. That amounts to about 120.4% of SLRN's average daily trading volume over the past month of 1.1 million shares. Especially high volume was seen for the $7.50 strike put option expiring March 15, 2024, with 8,128 contracts trading so far today, representing approximately 812,800 underlying shares of SLRN. Below is a chart showing SLRN's trailing twelve month trading history, with the $7.50 strike highlighted in orange:

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Today's Most Active Call & Put Options of the S&P 500 »

Universal Display Corp (OLED) saw options trading volume of 3,327 contracts, representing approximately 332,700 underlying shares or approximately 102% of OLED's average daily trading volume over the past month, of 326,220 shares. Especially high volume was seen for the $240 strike call option expiring September 20, 2024, with 2,000 contracts trading so far today, representing approximately 200,000 underlying shares of OLED. Below is a chart showing OLED's trailing twelve month trading history, with the $240 strike highlighted in orange:

And Ambac Financial Group, Inc. (AMBC) options are showing a volume of 4,847 contracts thus far today. That number of contracts represents approximately 484,700 underlying shares, working out to a sizeable 101% of AMBC's average daily trading volume over the past month, of 479,890 shares. Especially high volume was seen for the $15 strike put option expiring March 15, 2024, with 2,686 contracts trading so far today, representing approximately 268,600 underlying shares of AMBC. Below is a chart showing AMBC's trailing twelve month trading history, with the $15 strike highlighted in orange: