It's been a rough Wednesday session for the stock market and many S&P/ASX 200 Index (ASX: XJO) shares so far this hump day.

After minting a fresh new record high yesterday, investors seem to be in a reflective mood at present. At the time of writing, the ASX 200 has dropped by 0.37%. But that hasn't stopped at least three ASX 200 shares from smashing new 52-week highs today.

Let's check them out.

Three ASX 200 shares pushing new 52-week highs this Wednesday

HMC Capital Ltd (ASX: HMC)

First up is property stock and fund manager HMC Capital. HMC shares are happily buckling the market today, currently up a healthy 0.47% at $11.74 each. Earlier this morning, though, those shares pushed as high as $11.83, which is both a new 52-week and all-time record high for the company.

There hasn't been any specific ASX news from HMC today that might easily explain this company's new record. However, it's worth noting that investors have been piling into HMC stock for the past month or so, thanks to the company's plans to open a new real estate investment trust (REIT) specialising in data centres and associated digital infrastructure. Since that initial announcement back in late October, this company has now put on a pleasing 28.3%.

Alcoa Corporation (ASX: AAI)

Next up, we have ASX 200 aluminium share Alcoa. This company's shares are also having a decent time of it this Wednesday. The company is currently enjoying a 0.39% boost up to $70.05 a share. But earlier this morning, the shares rose as high as $70.66 each. That's a new 52-week high for Alcoa, as well as being the highest this CDI (CHESS Depositary Interest) has traded at since its ASX debut back in July.

Again, it's not quite clear what is sparking this investor optimism. However, Alcoa's US-listed stock jumped dramatically overnight, surging 3.68% up to US$45.60 per share. This may have been sparked by rising commodity prices, or perhaps investor optimism over President-elect Donald Trump's tariff plans. It's this jump in Alcoa's primary American listing that probably explains its ASX 200 shares' outperformance today.

Block Inc (ASX: SQ2)

Finally, we have another ASX 200 share and CDI in Afterpay-owner Block. Block is the best performer so far, with its shares savouring a 1.81% lift at the time of writing to $141.51. Earlier this afternoon, Block reached as high as $141.95, which is a new 52-week high for the company.

Again, there isn't much ASX news from Block today. However, this company's primary US listing swelled in the early hours of this morning. Block's American stock rose by 1.8% to US$92.42 a share after touching its own new 52-week high of US$93 during the Wall Street session.

As such, it's not too surprising to see its ASX 200 shares follow the leader.