These 3 ASX 200 shares are the most actively traded today

The S&P/ASX 200 Index (ASX: XJO) has slipped today after a strong initial push into positive territory. At the time of writing, the ASX 200 is down 0.25% to 7,274.5 points.

Let's take a look at some of the ASX 200 shares that are being the most heavily traded today:

3 ASX shares that are the ASX 200's biggest movers today

Whitehaven Coal Ltd (ASX: WHC)

Coal miner Whitehaven is one of the most active ASX 200 shares on the markets today, with 14 million shares having traded hands so far at the time of writing. That can probably be explained by Whitehaven's strong 5.72% jump today to $1.94 a share, which we looked at earlier. Whitehaven has also had a very strong month of performance, with the shares up close to 54% since early May. Investors can likely thank galloping coal prices for this situation.

Coda Minerals Ltd (ASX: COD)

Coda Minerals shares are also finding their way around the ASX boards today, with a hefty 23.5 million shares changing hands so far today. One look at the current Coda share price gives away the probable cause here. Coda shares are currently up a whopping 162% today to 93 cents a share. A promising ASX update this morning, which flagged a significant discovery at one of Coda's copper mines, has seemingly gotten investors very excited over the company's future.

Imugene Limited (ASX: IMU)

Imugene was the most traded ASX 200 share yesterday and has scored a double today, with the company topping ASX 200 trading with a substantial 52 million shares bouncing around the ASX boards. There have been no major news or announcements that might have sparked such a move. However, this company's trading today has been volatile. Imugene shares were up close to 7% in early trading this morning, but have since given up those gains, and are now down 3.12% to 32 cents a share at the time of writing. With such volatility, it's no real surprise to see such a large number of shares swapping hands today. Even so, Imugene shares are still up more than 19% over the past month, and 675% over the past year.