It hasn't been a very pleasant day for the S&P/ASX 200 Index (ASX: XJO) as a whole this Wednesday. At the time of writing, the ASX 200 is nursing a significant 0.47% loss, putting the index at around 8,450 points. But not all ASX 200 shares are feeling this sting today.

In fact, we've seen a flurry of new highs on the markets, despite the index's miserly performance, with no fewer than ten ASX 200 shares hitting new 52-week highs today. Many of these ten have even hit new all-time, record highs.

Let's get into them.

10 ASX 200 shares at new highs this Wednesday

Here are the ten ASX 200 shares that have seen a new high hit this session:

*at the time of writing

Some big ASX names there. Of these ten stocks, seven have just hit all-time highs, as well as new 52-week highs. They are REA Group, Xero, Computershare, Pro Medicus, News Corp, Life360 and TechnologyOne.

What's interesting with all ten of these shares is that most are moving higher despite any fresh news from the companies themselves.

Why are these ASX 200 shares at new highs today?

Pro Medicus is a particularly interesting example. It has hit its new record high today despite news that its two co-founders have just collectively offloaded $513.5 million worth of shares. It seems that nothing can dampen investors' seemingly insatiable demand for this high-flying ASX 200 share.

Life360 and REA Group are two ASX 200 shares that have been powering relentlessly higher in recent weeks. Both Life360 and REA Group received favourable broker reviews this week, so this could be a factor behind today's new highs.

Xero and TechnologyOne have cemented their status as market darlings in 2024. Although there's been no fresh news out of either company in the past week, both have seen strong buyer interest since their respective earnings reports in 2024 (TechnologyOne's came just last month).

AMP is another interesting case. This ASX 200 stalwart was under $1 a share this time last year. But today's new 52-week high marks a return to levels last seen in late 2020. The company's positive quarterly update from October seems to be helping investors regain their confidence.

So a big day for many ASX 200 shares this Wednesday, despite the performance of the ASX 200 Index itself. Let's see what happens with these stocks over the rest of the trading week.