Gamma Communications plc GAMA

This firm provide phone, data and broadband services to the UK business market. Operating since 2006, Gamma has seen strong, organic growth in the business.

Anyone know if this means someone is selling a load of shares, buying them, being allocated them in some way, or something else?

https://www.investegate.co.uk/gamma-communications--gama-/rns/holding-s--in-company/202109151205058845L/

As per point 7 on the form, the “resulting situation” is lower than the “previous situation” so the company mentioned has sold a portion of their holding.