That sounds quite plausable @TycoonTerry - as I was wondering why there hadn't been any "Change in substantial holding..." notices lodged by whoever was selling down, if they are a "Sub" and if they have been selling for almost 4 weeks now - 2 assumptions there which may or may not be true - because they would have to lodge one within 48 hours (or two business days) of any change of 1% or greater (up or down), while they remain over the 5% threshold (for substantial holders).
However, WMI are NOT substantial shareholders, despite listing RUL as one of their top 20 positions - and RUL was in their top 20 list in their January report. Will be interesting to see if it's still there when they release their report for February - which should be in about a week (WMI's January-2023-Investment-Update.PDF was released on Feb 14th). WAM Microcap (WMI) is only a $332 million fund, so they could hold RUL as a top 20 position and still be below 5% of RUL's share register, as RUL has a very similar market cap - currently $328m.
For example, if WMI is trading at an aprox. 15% premium to their NTA (which it looks like they are), then their NTA is probably around $289m, and if WMI's top 20 positions represented 80% of that $289m, then that's $231m (rounded to the nearest mil.). We don't know their weightings - as they list their top 20 in alphabetical order, not weighting order, so if we assume that they have an even amount invested in all 20 companies (which they don't but just looking for a ballpark number here), that means their RUL investment could be worth circa $11 to $12 million - roughly - which would be around 3.3% to 3.7% of RUL's shares on issue. Less than 5% means they're not a "Sub" so do not need to lodge any notices at all about their holdings, unless and until they go over 5%.
If they were selling down, or somebody like them who holds less than 5%, that would make a lot of sense.