It's been a busy day for the market so far. Let's go over some of the biggest movers as of Thursday afternoon.

Kroger

Kroger Co. (KR - Get Report) has been soaring after posting a hugely successful earnings.

Shares jumped some 9% to $28.59 shortly after 2 p.m. ET after the grocery giant posted fiscal first-quarter sales of $37.5 billion, up 3.4% from a year earlier. Adjusted earnings were 73 cents a share, 10 cents ahead of analysts' estimates. KR also raised the low end of its guidance for the fiscal year. 

Darden

Darden Restaurants Co. (DRI - Get Report) , the popular owner of Olive Garden, the Capital Grille and other eatery chains, Darden was up more than 13% at around $105 after the company posted killer earnings.

Adjusted fourth-quarter earnings totaled $1.39 a share, topping FactSet analysts' expectations of $1.35 and up 17% from a year earlier. Revenue came in at $2.13 billion, in line with expectations, but ahead of the $1.93 billion reported in the same period a year earlier.

For the full fiscal year ended May 31, Darden tallied earnings of $4.81 a share, up nearly 20% from a year ago and slightly topping analysts' estimates. Revenue was $8.1 billion, up 12.7% from a year earlier and in line with expectations.

Operating profit margins rose at Olive Garden, which is Darden's largest chain, with 856 locations. Snagging sales that grow faster than operating costs is typically difficult to do when seeing inflation and offering steep discounts, a practice for which Olive Garden has long been known.

Darden shares have gained 8.6% year to date and shares some 23.8% in the last three months.

Stitchfix 

Stitchfix Inc. (SFIX - Get Report) was looking strong for the second day in a row, was up 7% to $29 a share in afternoon trading.

The news that Oprah Winfrey was interested in investing in the clothing service shot shares up on Wednesday.

Overstock.com

Overstock.com Inc. (OSTK - Get Report) was down nearly 7% to $36.30 after the U.S. Supreme Court ruled that online retailers have to collect state sales tax

In a case involving furniture online retailer Wayfair but likely applicable across the industry, the court ruled 5-4 that online vendors must collect these taxes on online purchases made through their Web sites.

Sirius XM 

Sirius XM Holdings Inc. (XM dropped more than 5% to $7.11 after Goldman Sachs lowered its rating on the streaming-radio company to a "Sell." 

Intel

Intel Corp. (INTC - Get Report) is down more than 2% to $52.29 after CEO Brian Krzanich resigned after word emerged that he had a previous romantic relationship with a staffer.  Once Intel's board found out, it quickly pushed Krzanich to resign.