One quick investing lesson from a mistake I made recently

Learn from my mistakes with Fortescue Metals Group Limited (ASX:FMG).

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Legendary fund manager Peter Lynch said that investors often act as though they are losing money when a stock that they don't own soars. "I can't believe I didn't buy XYZ at $3, it's up 700%".  We've all done it.

Lynch says that then investors usually compound a costless error (not buying the stock) with a potentially high-cost error (going all-in on the stock after it's soared) and lose a lot of money. That is true, and is something you want to avoid. However, I also believe it is useful for investors to revisit why they didn't buy the stock – especially on the ones that skyrocket.

Sometimes, but not always, there's some sort of information or indicator that you didn't pay enough attention to, that could have tipped you to a possible winner.

Enter…Me

I made that error with Fortescue Metals Group Limited (ASX: FMG) about 18 months ago, when shares were at around $1.60 and the company issued bonds at double-digit interest rates. I thought the company was going down the toilet. I had this chart in the back of my mind, thinking that China's reduced demand for steel would see iron ore prices headed back to the bad old days:

Iron ore monthly prices over the past 20 years (source: IndexMundi and The Steel Index)

Iron ore prices fell to US$40 a tonne and I thought the floor was in the mid US$20s as this would make, at a guesstimate, half of the world's mines unprofitable. I figured Fortescue would wither away in mediocrity with minimal profits, paying 11% interest on its bonds, and struggle to pay its debt back by the due date. You know what happened next, and if you'd bought and held Fortescue shares at $1.60, you're now sitting on something like a 20% – yes, twenty percent – annual dividend (based on your purchase price) and a 300% share price rise.

Where I went wrong: 

There were 2 primary errors, and the 3rd and 4th error below were really just a product of the first ones.

  1. I closed my mind to the company. I believe that a low enough share price will make most companies a buy, but despite Fortescue's share price cratering I did not revisit my earlier thinking.
  2. I did not consider situations in which I could be wrong. The Chinese decision to spend on infrastructure and the subsequent Trump election, which promised spending on infrastructure, were two such occasions. Fortescue's corporate culture was another one; a colleague actually told me this at the time and I did not give much weight to the company's determination to cut costs.
  3. Because I had closed my mind to the company, I was not open-minded enough to consider that a small recovery in the iron ore price would lead to a big recovery in profits, and I already knew that Fortescue had some breathing space on its debt.
  4. Because I did not revisit my thinking, I did not value Fortescue to consider what might have happened if ore prices recovered. Had I done that, I might have realised that the company share price could multiply if prices recovered, and that Fortescue could have made for a small but interesting bet for part of my portfolio.

One Australian fund manager did exactly the opposite of what I did with South32 Ltd (ASX: S32) and Whitehaven Coal Ltd (ASX: WHC), and generated very respectable returns for their shareholders.

You can see here how closed-mindedness saw me miss a big winner. Is it just the perfection of hindsight? Possibly. Maybe I would have considered the possible upside and still decided the company was too risky. Mercifully, I didn't lose any money on this one, and I won't compound the error by diving blindly into Fortescue shares before having a good look at them.

Motley Fool contributor Sean O'Neill has no position in any stocks mentioned. The Motley Fool Australia has no position in any of the stocks mentioned. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy. This article contains general investment advice only (under AFSL 400691). Authorised by Bruce Jackson.

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