Notable Friday Option Activity: ILMN, TWTR, WDC

Among the underlying components of the S&P 500 index, we saw noteworthy options trading volume today in Illumina Inc (NASDAQ:ILMN), where a total of 3,953 contracts have traded so far, representing approximately 395,300 underlying shares. That amounts to about 49.6% of ILMN's average daily trading volume over the past month of 796,825 shares. Particularly high volume was seen for the $315 strike put option expiring June 25, 2021, with 1,000 contracts trading so far today, representing approximately 100,000 underlying shares of ILMN. Below is a chart showing ILMN's trailing twelve month trading history, with the $315 strike highlighted in orange:

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

Twitter Inc (TWTR) saw options trading volume of 108,060 contracts, representing approximately 10.8 million underlying shares or approximately 49.3% of TWTR's average daily trading volume over the past month, of 21.9 million shares. Especially high volume was seen for the $54 strike call option expiring May 14, 2021, with 6,956 contracts trading so far today, representing approximately 695,600 underlying shares of TWTR. Below is a chart showing TWTR's trailing twelve month trading history, with the $54 strike highlighted in orange:

And Western Digital Corp (NASDAQ:WDC) options are showing a volume of 18,094 contracts thus far today. That number of contracts represents approximately 1.8 million underlying shares, working out to a sizeable 43% of WDC's average daily trading volume over the past month, of 4.2 million shares. Particularly high volume was seen for the $74 strike call option expiring May 21, 2021, with 1,823 contracts trading so far today, representing approximately 182,300 underlying shares of WDC. Below is a chart showing WDC's trailing twelve month trading history, with the $74 strike highlighted in orange:

For the various different available expirations for ILMN options, TWTR options, or WDC options, visit StockOptionsChannel.com.