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My top 4 investment mistakes & 4 more mistakes investors make

Last Updated on January 30, 2022 by Mr. FightToFIRE
Investor jumping over pitfalls others have fallen in.
Try to prevent making the same investment mistakes others have made.

I screwed up more than once. Ever since I was allowed to hold an investment or trading account, I fell and got back up. I started in 2008 with Forex, and I moved to stocks over time. In this decade of trading both stocks and Forex, some of the mistakes I made happened more than once and cost me a pretty penny. Today, I want to share my 4 most significant lapses of judgment based on these experiences.

You will most likely think something along the lines of: “how could you make such stupid mistakes?” while reading. You are right. I should know better, of course, but alas, hindsight is 20/20. At least I can share my mistakes, so you don’t make them as well. Some, if not all of these, might not be new to you and are tackled by others, but when it comes to learning from one’s own mistakes, you can never repeat them enough.

So, without further ado, these are the mistakes I have made ever since I traded in both the stock and forex market.
Some of them caused more financial damage than others, but they all impacted me overall.

Being a worrywart

In other words, being too concerned about my investments. In general, I’m not too concerned with them (hence it’s “only” my number 4) but nonetheless, from time to time I doubt myself and create needless worry in my mind.

I’m highlighting this as a mistake because it makes you unconsciously assess investments riskier than they actually are while at the same time making you less tolerant of those perceived risks. By creating your risk profile (this can be with a bank but also online), you can gain a more objective view of your sense of risk and quantify this concern.

Green 4
Green 3

Seeking confirmation

Seeking confirmation is a mistake I made a lot when I was still trading in the forex market and luckily have less of a problem with stocks. Whenever I had doubts about the entry of a currency pair (mainly EURUSD) I would seek out other traders on sites such as tradingview to find confirmation of the direction I traded. I caught myself more than once filtering through ideas of others searching for confirmation.
It’s an error that a lot of investors often make. You cling on to an opinion (of a share) regardless of the (negative) news.

Suppose you buy a Twitter share because you believe this little bird will take off big time. Once you have it in your portfolio, you risk seeing all information about Twitter in a positive light. This means you will magnify the financial impact of positive news and minimize or even ignore negative news. You will unconsciously look for information that confirms your positive opinion.

You're biased!

This behavioral abnormality called “confirmation bias” and threatens to cost you a lot if you ignore important negative news and absolutely stick to your Twitter share.
As the market price of your share drops (as it did for Twitter in January 2014) you might buy more shares based on your wrong positive attitude and increase the loss even more.
It is therefore quite important to look at all the information about a company without prejudice. Ask yourself these questions:

  • What is the impact of this (positive or negative) information?
  • Will the original reason why I bought the share stay?

These are important questions you should ask before you (re)purchase your favorite shares.

Losing track of the costs

Entry fees, brokerage fees, management fees, taxes, you name it. Anyone who invests their money knows that there are a lot of costs involved in investing which can become quite big if you don’t pay attention.
For Euroepeans at least, from this year on, the costs of your investments may no longer contain any secrets for you. Thanks to MiFID II – the European directive that lays down the rules for the sale of financial products and services – your bank is obliged to provide you with a global overview of all costs you paid last year.
Some of these charges are communicated transparently throughout the year, but there are also some “hidden” charges that are not immediately mentioned. These hidden are even present when you buy an ETF.

What must remain hidden

Overview of the total cost of ownership for an ETF. Original image by
The total cost of ownership for an ETF investment. Copyright

These invisible costs include:

  • Operational costs of a fund
  • Marketing and distribution costs
  • Administrative and accounting costs.
  • For ETFs:
    • Rebalancing costs
    • Spread
    • Securities lending
    • Brokerage fees
    • (local) Taxes.

The above costs are paid by the profits from the investments.

Besides these costs – yes there is more – (active) funds bought through your bank coming from an external asset manager also had hidden commissions that flow back to the bank in the form of “kickbacks”.
Fortunately, this has been tightened up with MiFID II and your bank is no longer allowed to receive these commissions.
However, there are still several loopholes that can be used. If your bank can prove that it serves to offer a better service (IT platform to keep track of your purchases) they may still charge for this, although this must be clearly stated in the statement of charges. Names given to this are:

  • Distribution Fees
  • Retrocessions
  • Inducements
Green 2
Green 1

Herd mentality

This is one pitfall I, unfortunately, fell into one too many times. In times of bitcoin madness, this is particularly relevant as I jumped in on it at the beginning of 2018 like many people. Investors who follow each other are of course not new, but that is precisely why it is important to underline this mistake. I continue to make this mistake.

Herd behavior occurs among both private and professional investors. Even fund managers regularly follow each other to the flavor of the day. It is much more comfortable to be all wrong than to be the only one right. Until the market proves you correct, you are under immense pressure to change your opinion and follow the masses, especially if the masses are ultimately right.

I already mentioned bitcoin and my other recent “herd purchase” (although to a lesser extent) was because of bitcoin as well: Nvidia.
While the company itself is solid, its price got heavily inflated because of the bitcoin craze. While I didn’t purchase the stock right away and thus not at its peak, I entered pretty late and I now own Nvidia at an average purchase value of about 200 USD.

And 4 more mistakes investors make


When we buy a share as investors, we open a mental account for this share. Very important is the anchor point that we create for this account. Often that is the purchase price or a recent record price. Under this anchor point we will not like to sell. That often leads us to spend a long time with “losers”. Anchoring also changes our perception of a share; when ING dropped from more than 30 to 20 EUR at the beginning of 2000, we were often told how cheap ING had become. Then it dropped even further below EUR 10 before recovering to EUR 20. Then we were told how expensive ING had become. So the same end result (20 EUR) was interpreted differently in terms of where it came from.

It just doesn't care

The problem is that the stock market does not care about these anchor points. The price moves independently of our purchase price. It is only the performance of the company and the sentiment of the stock market that will determine whether the stock market price rises again to our purchase price or to a historical top.
Sometimes it is better to sell a share at a loss because the prospects are not good and the chance is very small that the price will recover. But that’s something that few investors get off their chest.

Newest information

Investors attach most importance to the latest information. Although that may seem logical somewhere, it is not always the best basis for assessing a company.
Perhaps in the past quarter exceptional elements played a role that blew up profits. Just think of the crypto madness that $NVDA didn’t do any harm in 2018, but it did break them up afterward.
It is therefore very important to always keep an eye on the long-term trend. The same advice applies to the choice of investment funds. Investors are too much guided by the most recent fund performance. However, these say little or nothing about the future.

Fairy tales

Whether it’s in the pub, during the elections or when choosing shares, apparently we all love nice stories. What’s more: we’re more likely to be convinced by a beautiful story than by an objective analysis full of facts and figures. Even when the story is invalidated by a ‘dry’ analysis, we prefer to believe the anecdotal ‘evidence’. Once we believe a story, confirmation bias occurs. We minimize or ignore all information that does not fit in our stand.


Analyzing companies and choosing the right results for your portfolio is no easy task. There is a risk that you will be representing yourself in this. Investors base their decisions on superficial characteristics or facts instead of in-depth analysis. A well-known statement is that “a good company is never a bad investment”. Investors assume that the share of a profitable company -regardless of how expensive it is- will eventually be a good investment. However, it is the super investor Warren Buffer who once said that “buying a good company at an expensive price is a bad investment”. So it takes a lot more to choose a stock than just that the company is ‘good’. An extreme example of representation we saw during the dotcom bubble. every company ending on ‘.com’ in its name immediately took off into the air was catapulted. Recently we saw this again in companies that were linked to bitcoin. In the meantime, that is already over of course.

Declining results

Better safe than sorry

Knowing which mistakes you shouldn’t make is one thing, but what should you do then? Well, here are 7 tips to stay rational:

  1. Diversify your portfolio so that you limit the weight of one individual stock. Do note when you diversify through funds, both active and passive, that you don’t lose track of your costs.
  2. Never, ever let yourself get dragged into hypes. They usually end up in tears for the vast majority.
  3. Know what you get yourselves into: what are the risks and which return can I reasonably expect?
  4. Don’t let yourself get influenced by your emotions and especially not those of others.
  5. Don’t try to time the market. Rather invest periodically and consistent over time. If you have 10K to invest, spread it out over 10 months rather than 1 big purchase. Of course, this does mean you will have multiple one-time costs, but these only take a small percentage of your final total costs.
  6. Don’t chase the recent market return. Look at the past and try to educate yourself on the performance of the company or fund you are interested in.
  7. Keep (running) costs in check. Don’t over-trade as this will inevitably result in more expenses that you can’t recover. Also, don’t pay more than you have to. This holds especially true for funds, even passive ones. Take IEMA & EIMI for example. The prior has a running cost of 0.68% while the later has one of 0.18%. EIMI is a solid 73.53% cheaper and does the same thing.

More mistakes!

These mistakes are one of the most made ones, but there are still a few more that investors make. has a good list as well that is worth checking out. Even the SEC (Securities and Exchange Commission) has a ten-pointer list.

What are your 4 biggest (financial or emotional) investment mistakes?

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Do you have other pointers that you wish to share? Please leave a comment below and help others in their investment adventure.

I'm a developer for a major financial institution in Belgium that is present in over 40 countries. I have over 8 years of working experience in the development of customer applications focussing on all aspects of banking. This helped me gain a deep understanding of the inner workings of a commercial bank. All of this experience in both banking and life culminates in this blog about personal finance and my fight towards FIRE.

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Is it me or EMIM and EIMI are the same now?

B at Fire The Boss

For me the biggest mistakes are looking at your portfolio every day (I still do this most days). It makes you unnecessary conscious of what’s happening in the short term but truth is it doesn’t matter.

So make a plan (an investor policy statement as I’ve written about) and stick to it. Just execute execute execute.

Nick @

This is exactly why I don’t do stocks – I simply do not have the stomach to NOT look at my portfolio every day. If I did go into stocks, I would most likely turn to day-trading, and while I believe it can be a fine strategy, I would go bananas looking at numbers and Graphs multiple times per day.

Slow and steady wins the race – or so people keep telling me. The problem is, I appear to be more a “Fast’N’Loud” kind of guy 😛

So my advice would be to know yourself – are you the anxious kind, then you should gravitate towards the least volatile assets…

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