"I understand from when BRN entered the ASX300 in Mar 2021, it allowed superannuation funds to increase their exposure to the stock. Is this a similar pattern we can expect to see when it enters the ASX200 - assuming by March it is still eligible? What exactly happens and what benefits/negatives are there?"
If you are genuinely interested, there is a good discussion contained in the link above. They explore how companies should get ready to enter an index and take advantage of the momentum and publicity generated by this event.
It is interesting you are focusing on the market cap (which is what entering the ASX 200 is about) in this post, and not on the merits of the underlying business itself. In my view the recent share price action is almost totally divorced from the underlying business itself.
As I have posted several times, in my view, the recent price action has been largely drive by FOMO as well as a frenzied reaction by gullible and vulnerable people to the wild speculation posted on BrainChip Facebook groups, reddit, HotCopper posts, Telegram groups etc etc that this is their ticket to untold wealth.
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