PENDING corporate actions

What is a PENDING corporate action and how does it affects stocks ?

*** I heard PENDING corporate actions have a negative impact. Is that true? If yes, why?

Look up on business standard or economic times
Corporate actions are stuff like stock splits, announcing results, bonus issue, share buyback etc

Some are +ve, some are -ve,

Depends on the company/situation/market direction

No rule that its always -ve

Not all corporate actions have a negative impact on the price of a stocks. Check this module on varsity to understand the impact of corporate actions on stock prices.