With half a day of trading left in the week, the S&P/ASX 200 Index (ASX: XJO) is up 0.7% since last Friday's close, with three ASX 200 stocks doing more than their fair share to contribute to those gains.

Which outperforming shares am I talking about?

Read on.

ASX 200 stocks smashing the benchmark this week

The first company having a smashing run this week is SGH Ltd (ASX: SGH), which you may know as Seven Group Holdings.

SGH shares closed last Friday trading for $49.10 apiece. At the time of writing today, shares are changing hands for $54.46 each, up 10.9% for the week. This sees the SGH share price up 39.8% in a year. The ASX 200 stock also trades on a fully franked dividend yield (part trailing, part pending) of 1.1%.

Investors reacted positively this week to Seven Group's half-year results, which were released on Tuesday.

Highlights from the diversified operating company included revenue of $5.5 billion, up 2% year on year. And earnings before interest and tax (EBIT) surged 10% to $843 million. SGH also pleased passive income investors with a 30% boost of its interim dividend to 30 cents per share.

"The result was driven by our disciplined focus on customer service, execution and operating leverage, ultimately delivering overall revenue, margin and earnings growth in the period," SGH CEO Ryan Stokes said on the day.

Also shooting the lights out this week is Nine Entertainment Co. Holdings Ltd (ASX: NEC).

The ASX 200 stock closed last week at $1.29 a share. At the time of writing, shares are trading for $1.51 apiece, putting the Nine Entertainment share price up 17.1% for the week.

Longer term, shares remain down 21.1% over a year. Nine Entertainment stock also trades on a fully franked 5.6% trailing dividend yield.

There was no fresh price-sensitive news from the multi-media company this week, but the stock looks to have caught some welcome tailwinds from the half-year results delivered by Seven West Media Ltd (ASX: SWM) on Tuesday.

As the Motley Fool's James Mickleboro pointed out on the day, "Investors appear to have gained enough knowledge from Seven West Media's results to predict that Nine Entertainment is likely to deliver a better than forecast result later this month."

Leaping ahead of the pack

Which brings us to the top-performing ASX 200 stock on our list for the week, Computershare Ltd (ASX: CPU).

The Computershare share price closed last Friday at $35.22 and is currently at $42.81, up a whopping 21.6% for the week.

This sees the Computershare share price up 62.8% in 12 months and trading at all-time highs. Shares in the financial administration company also trade on a 2.0% unfranked trailing dividend yield.

The ASX 200 stock received a huge boost following Wednesday's release of its half-year results, with shares closing up 15.5% on the day.

Highlights included a 6.4% year-on-year increase in management revenue to $1.5 billion.

Computershare's interim dividend of 45 cents per share was up 12.5% from the prior interim payout.