Stocks and Shares ISA in the red? Here’s how I’d react

After seeing the value of some holdings in his Stocks and Shares ISA crash, our writer reflects on how he could react as a long-term investor.

The content of this article was relevant at the time of publishing. Circumstances change continuously and caution should therefore be exercised when relying upon any content contained within this article.

You’re reading a free article with opinions that may differ from The Motley Fool’s Premium Investing Services. Become a Motley Fool member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn More.

Mindful young woman breathing out with closed eyes, calming down in stressful situation, working on computer in modern kitchen.

Image source: Getty Images

It can be alarming to invest money hoping to see it increase only to see it disappear. That happens to most investors at some point, as markets go down as well as up. Sometimes, looking at my Stocks and Shares ISA, I see its value is in the red. That could be alarming – so here is what I do.

Understand paper losses

Stock markets move up and down, as do individual shares. The valuation of a portfolio, such as that held in a Stocks and Shares ISA, is usually a snapshot of the money I would expect to get if I sold the shares today. But if I do not sell, a negative valuation is only what is known as a paper loss.

As the name suggests, it exists on paper (or a screen). If I sold at the current price, I would make a loss. But I can keep owning the shares and doing nothing. If they move up in price, my ISA may move into the black again. Then again, they might not recover. Shares that fall can keep falling.

A valuation is a summary of what the whole universe of investors thinks my portfolio is worth right now. I actually think that is valuable information for me to have even if it makes for difficult reading. Indeed, it might lead me to re-evaluate some of my investment decisions. Crucially though, the paper loss does not mean I have actually lost money — unless I sell the shares at such a price.

Revisiting investment cases

But imagine that a share in my ISA is showing a huge loss – maybe it is 50%, 70% or even 90% lower in price than when I bought it.

Although that does not mean I have actually lost money if I have not sold any shares, it certainly would grab my attention. Imagine a share fell 90%? Sadly I do not need to imagine this, as the past year has seen the share price of my holding Renalytix tumble 89%. So basically, if the market reckons a share is worth just one tenth of what I paid for it, what does that tell me about its valuation?

Reshaping my Stocks and Shares ISA

Either I have overvalued it, or the market overall is undervaluing it. We cannot both be right.

Therefore, a large fall could be a trigger for me to revisit the investment case for a particular stock. If things have changed that affect how I value a share, such as a worse profit outlook, maybe I will think the price drop is justified. In that case I may decide whether I want to keep holding the shares, or act on the changed investment case and sell at a loss. Doing the latter can be painful, but less costly than selling at an even bigger loss further down the line.

What if I think nothing fundamental has changed in the investment case but the shares are now much cheaper than they were? In that case, I may decide to use the price drop as a buying opportunity to add to my position, while never letting any one single share become too dominant in my ISA.

Christopher Ruane owns shares in Renalytix. The Motley Fool UK has no position in any of the shares mentioned. Views expressed on the companies mentioned in this article are those of the writer and therefore may differ from the official recommendations we make in our subscription services such as Share Advisor, Hidden Winners and Pro. Here at The Motley Fool we believe that considering a diverse range of insights makes us better investors.

More on Investing Articles

Investing Articles

Should I dump my Lloyds shares before markets crash?

Lloyds shares have held reasonably steady during the recent bout of stock market volatility but some investors may be wondering…

Read more »

Warren Buffett at a Berkshire Hathaway AGM
Investing Articles

Amid a volatile US stock market, here’s Warren Buffett’s advice

US stock market sentiment looks increasingly fragile, our writer reckons. So he's trying to learn from Warren Buffett and get…

Read more »

Woman riding her old fashioned bicycle along the Beach Esplanade at Aberdeen, Scotland.
Investing Articles

Up to 8.6% dividend yield! 2 cheap stocks to consider for a £1,540 passive income

Cheap income stocks can unlock fantastic yields for investors. And today, are shares of this financial duo just what income-hungry…

Read more »

Middle aged businesswoman using laptop while working from home
Investing Articles

A 7.2% yield but down 49%! Is it time for me to buy this FTSE REIT to earn passive income

With this REIT approaching a critical recovery inflexion point, is now a last chance to lock in a 7.2% dividend…

Read more »

Rainbow foil balloon of the number two on pink background
Investing Articles

With 6%+ yields, are these two of the best stocks to consider buying for passive income?

There are loads of incredible dividend shares around. But stocks offering generous levels of passive income could be value traps.…

Read more »

Rear view image depicting a senior man in his 70s sitting on a bench leading down to the iconic Seven Sisters cliffs on the coastline of East Sussex, UK. The man is wearing casual clothing - blue denim jeans, a red checked shirt, navy blue gilet. The man is having a rest from hiking and his hiking pole is leaning up against the bench.
Investing Articles

How much do you need in a SIPP to aim for a £5,000 monthly retirement income?

Zaven Boyrazian explains how to start building a long-term passive income with a SIPP to unlock a comfortable retirement of…

Read more »

Three signposts pointing in different directions, with 'Buy' 'Sell' and 'Hold' on
Investing Articles

What are the ‘best’ stocks to buy with £500 in 2026?

Zaven Boyrazian explores 21 UK shares that the analyst team at Peel Hunt has highlighted as potentially the best growth…

Read more »

Friends at the bay near the village of Diabaig on the side of Loch Torridon in Wester Ross, Scotland. They are taking a break from their bike ride to relax and chat. They are laughing together.
Investing Articles

How much should a 40-year-old put in an ISA to earn a £2k monthly passive income at 65? 

Keen to build a lifelong passive income from a portfolio of FTSE 100 shares, entirely free of tax? Harvey Jones…

Read more »