The S&P/ASX 200 Index (ASX: XJO) is having a positive session on Thursday. In afternoon trade, the benchmark index is up 0.35% to 8,425.1 points.

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

Champion Iron Ltd (ASX: CIA)

The Champion Iron share price is up 2% to $4.34. Investors have been buying this iron ore miner's shares following the release of its four quarter and full year results. In respect to its fourth quarter, Champion Iron revealed production of 3.2M wmt, record sales of 3.5M dmt, revenue of C$425 million, and EBITDA of C$127 million. The latter was a 44% increase on the prior quarter and a 50% lift on the same period last year. Champion's CEO, David Cataford, said: "Despite seasonal challenges that typically impact transportation logistics, we achieved record quarterly sales of high-purity iron ore concentrate."

Clarity Pharmaceuticals Ltd (ASX: CU6)

The Clarity Pharmaceuticals share price is up 2% to $2.20. This morning, the clinical-stage radiopharmaceutical company revealed that it has imaged the first patient in its pivotal Phase III AMPLIFY trial for 64Cu-SAR-bisPSMA. The AMPLIFY trial is aiming to gather enough data to support a New Drug Application (NDA) with the U.S. Food and Drug Administration (FDA). Executive chair, Dr Alan Taylor, said: "We are excited to have imaged the first patient in the AMPLIFY trial and look forward to further progressing recruitment and opening clinical sites across the United States (US) and Australia, providing access to 64Cu-SAR-bisPSMA in both countries as part of this trial."

St Barbara Ltd (ASX: SBM)

The St Barbara share price is up almost 2.5% to 31.2 cents. This has been driven by the release of positive results from a study looking at the integration of the Cochrane Hill Project with a 15-Mile Processing Hub. The study found that the optimal development is a 3 Mtpa processing plant at 15-Mile with mill feed from Beaver Dam and Cochrane Hill transported by road. This is expected to deliver average gold production of approximately 106,000 ozpa over an 11 year mine life with a low ASIC of US$1,197 per ounce.

Woodside Energy Group Ltd (ASX: WDS)

The Woodside share price is up 3% to $22.80. This energy producer's shares are lifting today after the Federal Government gave the thumbs up the North West Shelf Project extension. Woodside's chief operating officer of Australia, Liz Westcott, said: "This proposed approval will secure the ongoing operation of the North West Shelf and the thousands of direct and indirect jobs that it supports."