There’s no doubt that Warren Buffett’s annual letters are a worthwhile read for any keen private investor. But personally, one of my favourite missives comes from a fund manager who operates on this side of the Atlantic – albeit with a penchant for holding US stocks.

Terry Smith’s 2023 letter was published a few days ago and offers the usual mix of pithy opinion, investing insight and Fundsmith performance metrics.

Starting with the latter, Fundsmith’s flagship Equity Fund gained 12.4% last year, underperforming its benchmark the MSCI World Index, which returned 16.8%.

I don’t think this is too bad a result, for a year in which a big chunk of global equity returns were driven by the so-called Magnificent Seven, of which Smith owns some but not all. (The Magnificent Seven are Alphabet (NSQ:GOOGL), Amazon.com (NSQ:AMZN), Apple (NSQ:AAPL), Meta Platforms (NSQ:META), Microsoft (NSQ:MSFT), NVIDIA (NSQ:NVDA) and Tesla (NSQ:TSLA))

Importantly, Fundsmith remains ahead on a long-term view, with an annualised return of 15.3% since inception in 2010, versus 11.5% for the MSCI World Index.

Smith’s secret sauce (and my top metric)

I think that some of Fundsmith’s outperformance has been driven by significant multiple expansion over the last decade or so, in addition to good stock selection.

But I’m in no doubt that much of his success is due to his disciplined focus on an investing ratio I would bill as the most important metric in long-term investing – return on capital employed.

Smith never fails to emphasise this in his writing and sure enough, ROCE gets a mention in this year’s newsletter:

Consistently high returns on capital are one sign we look for when seeking companies to invest in. 

There is a caveat, of course:

Another is a source of growth — high returns are not much use if the business is not able to grow and deploy more capital at these high rates.

I think the significance of these two requirements and their real-world impact can best be illustrated with an example.

Compare the share price performance of FTSE 100 members Tesco (LON:TSCO) and Unilever (LON:ULVR) over the last 20 years:

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In general terms,…

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