Looking at the movers and shakers on the ASX200 today.

GrainCorp is leading the stock rockets today, up 5.8% today this session so far in the aftermath of the company upgrading its 2022 financial year guidance on Friday.

Regis Resources is trading 4.7% higher.

And IGO rounds out the top three stock rockets today, up 3.9% after lunchtime after the company announced that it has agreed to amend the scheme of arrangement with Western Areas for IGO to acquire 100% of WSA shares for a cash consideration of $3.87 per share.

On the losing front, Paladin Energy leads the losers today, down almost 4% during the session so far.

Tyro Payments is trading down 3.2% today despite the payments provider releasing a trading update for last week showing transaction value increased last week by 53% on the same week last year.

And A2 Milk is also trading 3.2% lower today despite no price sensitive news released by the premium dairy and infant formula company today.