P/E ratios of trusts and funds15 Aug 2021 21:42
Posting this info second hand to Steph about 10 months late as I did not understand it myself but knew P/E ratios listed are not truthfull for any trust or fund:
The portfolio P/E is the harmonic mean of the individual stocks' P/Es, not the simple average.
- The portfolio earnings yield (the inverse of its P/E ratio) IS the simple average of the constituent stocks' earnings yields.
- The correctly-calculated portfolio P/E will never exceed the simple average P/E of the constituent stocks.
- Low P/E stocks influence the portfolio's overall P/E ratio more than high P/E stocks.
To illustrate the last point, an equal-weight portfolio consisting of a 10 P/E stock and a 190 P/E stock has a simple average of (10 + 190) / 2, suggesting a P/E of 100, but the correct P/E is actually 19.
Doesn't help with the limitations of P/E as a measure, but corrected some of my thinking about portfolio and fund-level P/E.