In afternoon trade, the S&P/ASX 200 Index (ASX: XJO) is on course to record a small gain. At the time of writing, the benchmark index is up 0.25% to 8,214.7 points.

Four ASX share that are rising more than most today are listed below. Here's why they are storming higher:

Catapult Group International Ltd (ASX: CAT)

The Catapult Group share price is up 9% to $2.87. Investors have been buying the sports technology solutions company's shares after responding positively to the release of its half year results. Catapult delivered a strong six months, reporting a 20% constant currency increase in annualised contract value (ACV) to a record of US$96.8 million (A$143 million). Also impressing the market was the company's free cash flow (FCF) generation of US$4.8 million (A$7 million). This is more than it generated in the whole of FY 2024. CEO Will Lopes said: "Our Performance & Health vertical delivered another predictable and reliable performance, and we're continuing to see increased adoption of our New Video Solutions in our Tactics & Coaching vertical."

Flight Centre Travel Group Ltd (ASX: FLT)

The Flight Centre share price is up 4% to $17.32. This follows the release of a trading update at the travel agent giant's annual general meeting. Commenting on recent trading in the second quarter, CEO Graham Turner said he was "heartened by a marked recovery in October across our key metrics of TTV, profit and profit margin." This is a big positive given its "patchy first quarter." The market appears to believe its half year results may not be as bad as feared now.

Nufarm Ltd (ASX: NUF)

The Nufarm share price is up 6% to $3.89. Investors have been buying this crop protection and seed technology solutions company's shares following the release of its full year results. Nufarm reported underlying EBITDA of $313 million, which was in the middle of its guidance range. Looking ahead, management appears to believe that it is over the worst now. The company said: "We are seeing solid end use demand and stable active ingredient prices for crop protection products. As a result, we do not expect to see the same deflationary impact from falling active ingredient prices that we saw in FY24."

Xero Ltd (ASX: XRO)

The Xero share price is up 6% to $171.16. The catalyst for this has been the release of the cloud accounting platform provider's half year results. Xero's shares hit a record high after impressing with a 25% increase in half-year operating revenue to NZ$995.9 million and a 76% jump in net profit after tax to NZ$95.1 million. Xero's CEO, Sukhinder Singh Cassidy, said: "This result reinforces our ability to deliver on our strategy. We have delivered a solid performance across the board this half including continued strong revenue growth, and a greater than Rule of 40 outcome for the second period running. We're executing our strategy with focus and purpose, through disciplined investment aligned to our strategic priorities."