A range of studies suggest that relaxing the UK’s rules on premium listings carry little risk to investors.

First, look at staggered boards, which reduce the ability of shareholders to kick them out when quarterly results disappoint and allow managers to focus on the long-term.
One study, which looked at 34 years of data of board staggering and destaggerings, found that staggered boards are “associated with a statistically and economically significant increase in firm value”. https://papers.ssrn.com/sol3/papers.cfm?abstract_id=2674679
This study isn't an outlier by the way.

More independent boards seem to make business more valuable. https://twitter.com/bswud/status/778619696593661952
What about small floats? Again, a study to be published in the Journal of Banking and Finance finds that companies that float less than 20% of their shares outperform the market over the long term.

https://papers.ssrn.com/sol3/papers.cfm?abstract_id=2359323
For context, to get a premium listing in the UK you need float at least 25% of your shares. https://www.pwc.com/mn/en/capital-markets/assets/mn_successful_listing_in_london_eng.pdf
The status quo is in some ways, the worst of both worlds. The researchers find that while small floats do best, big floats also perform well. It’s the inbetweeners selling between 20% and 40% that perform worst.
SEC commissioner Robert Jackson Jr analysed 157 dual-class IPOs form the past 15 years and found that businesses that had sunset provisions on their dual-class shares performed better over the medium to long term.

https://www.sec.gov/news/speech/perpetual-dual-class-stock-case-against-corporate-royalty#_ftn6
As he puts it, some "companies are asking shareholders to trust management’s business judgment—not just for five years, or 10 years, or even 50 years. Forever.”

Sunset clauses for premium listings seem to make sense and are likely to be demanded by index providers anyway.
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