US AI chip giant, Nvidia is rapidly propelling its stock to record highs

It's become the first company in the world to reach a market value of five trillion dollars.

Its share price rose nearly five percent at the open of trading on Wall Street, pushing its market capitalisation past a new threshold.

Tech expert Paul Stenhouse says Nvidia only hit four trillion three months ago.

He says it's now 8.3 percent of the S&P 500.