The S&P/ASX 200 Index (ASX: XJO) is ending the week on a positive note. In afternoon trade, the benchmark index is up 0.65% to 8.278,6 points.

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

Catapult Group International Ltd (ASX: CAT)

The Catapult Group share price is up a further 3% to $2.95. Investors have been buying the sports technology solutions company's shares since the release of its half year results. Catapult posted a 20% constant currency increase in annualised contract value (ACV) to a record of US$96.8 million (A$143 million) and free cash flow (FCF) of US$4.8 million (A$7 million). Analysts at Bell Potter were impressed, noting that the company delivered "beats across the board." The broker said: "1HFY25 revenue grew 16% to US$57.8m and was 2% above our forecast of US$56.9m. The beat was driven by higher Tactics & Coaching (T&C) revenue than we forecast (US$19.5m vs BPe US$19.0m) and importantly this division grew by mid teens rather than the low teens we were forecasting."

De Grey Mining Limited (ASX: DEG)

The De Grey Mining share price is up 4% to $1.39. This may also have been driven by a broker note out of Bell Potter. It was pleased with the company's mineral resource update and continues to believe the gold developer could be a takeover target. It said: "DEG remains a likely takeover target in our view, with Gold Road (GOR, Buy, TP$2.40/sh) not in a position to become active on DEG. We expect its 17% shareholding is becoming non-core and the first port-of-call for a potential acquiror of DEG. We update our exploration valuation and apply our latest (higher) gold price forecasts to our risk-adjusted NPV-based valuation of the HGP. Our valuation lifts 18%, to $2.15/sh. We retain our Speculative Buy recommendation."

Domino's Pizza Enterprises Ltd (ASX: DMP)

The Domino's share price is up 4% to $29.60. Investors have been buying the pizza chain operator's shares amid news that Warren Buffett has been loading up on the shares of its US parent company.

Nufarm Ltd (ASX: NUF)

The Nufarm share price is up 3% to $3.99. This crop protection and seed technology solutions company's shares have been pushing higher since the release of its full year results. Morgans was somewhat disappointed with the result but believes the worst is likely over now. As a result, this morning it upgraded Nufarm's shares to an add rating with an improved price target of $4.53.