S&P/ASX 200 Index (ASX: XJO) shares are rebounding, currently up 1.4% to 7,449.1 points at the time of writing.

Today's rebound follows a horror day on the market yesterday.

ASX 200 shares fell to their lowest point since December 2023 yesterday, closing 4.23% lower at 7,343.3 points.

Overnight, the S&P 500 Index (SP: .INX) closed 0.23% lower, and the Dow Jones Industrial Average Index (DJX: .DJI) fell 0.91%.

Today's ASX 200 rebound suggests some investors are taking advantage of the market weakness caused by the new US reciprocal tariffs.

Many appear to be buying the dip and/or dollar-cost averaging some of their ASX 200 shares for longer-term gains.

Here are the 10 stocks rising fastest on the market today.

10 ASX 200 shares leading the rebound

According to the ASX, these shares are rising fastest in today's market rebound.

Block, Inc. (ASX: XYZ)

Block shares are up 11.1% to $85.415 at the time of writing.

There is no company news for this ASX 200 financial share today.

Liontown Resources Limited (ASX: LTR)

The Liontown share price is up 10.3% to 48 cents.

There is no company news for this ASX 200 lithium share today.

Zip Co Limited (ASX: ZIP)

The Zip share price is up 10% to $1.31.

The buy now, pay later company announced an on-market share buyback of up to $50 million today.

The buyback will commence around 23 April and run for up to 12 months.

Zip CEO Cynthia Scott said:

The buy-back program we have announced today is consistent with our capital management framework and focuses on maximising shareholder returns. Zip will maintain a strong balance sheet following completion of the buy-back with ongoing flexibility to pursue future growth opportunities.

Life360 Inc. (ASX: 360)

Life 360 shares are 9.4% higher at $18.31.

There is no company news for this ASX 200 tech share on Tuesday.

PolyNovo Limited (ASX: PNV)

The PolyNovo share price is up 7.4% to $1.05.

The skin regenerative medicine company has not released any news today.

Whitehaven Coal Limited (ASX: WHC)

This ASX 200 coal share is 7.4% higher at $4.67.

There is no company news from Whitehaven today.

Mesoblast Limited (ASX: MSB)

The Mesoblast share price is up 6.8% to $1.725.

The ASX 200 biotech company has not released any news today.

Amotiv Limited (ASX: AOV)

Amotiv shares are up 6.6% to $7.28 apiece.

The auto parts retailer released a presentation relating to its manufacturing facility in Thailand today.

Capstone Copper Corp (ASX: CSC)

This ASX 200 copper stock is trading 6.57% higher at $6.81.

The company announced it will release its 1Q FY25 results on Thursday, 1 May, after the market close.

Pro Medicus Limited (ASX: PME)

This ASX 200 healthcare share is up 6.5% to $188.44.

The ASX 200 healthcare company has not released any news on Tuesday.