Few stocks have been able to wrangle their way into the S&P/ASX 20 over the past few years, earning themselves a place among the bourses biggest as their market caps swelled. 

In 2020 alone, Amcor lost its place in the top 20 to Aristocrat Leisure, while a few months later Coles and Fortescue earned their stripes among the ASX all-stars - with Scentre Group and Suncorp receiving the boot. By the end of the year, it was all over for Insurance Australia Group, with Afterpay kicking the multinational conglomerate out of the mix. 

But, as they say, what goes up - must come down. 

In this episode of Buy Hold Sell, Livewire's Bella Kidman sits down with WaveStone Capital's Catherine Allfrey and Elston's Bruce Williams for a look at some of the mid-cap stocks that could be inching their way up to the lofty top 20. Plus, they'll also share two stocks that they believe could be on their way out. 

Note: This episode was filmed on 9 June 2021.