Bullish 4basebio Insider Buying Worth UK£1.43m Yet To Pay Off

Simply Wall St

Insiders who bought UK£1.43m worth of 4basebio PLC's (LON:4BB) stock at an average buy price of UK£13.19 over the last year may be disappointed by the recent 14% decrease in the stock. Insiders invest with the hopes of seeing their money grow in value over time. However, as a result of recent losses, their initial investment is now only worth UK£781.6k, which is not what they expected.

While we would never suggest that investors should base their decisions solely on what the directors of a company have been doing, we would consider it foolish to ignore insider transactions altogether.

4basebio Insider Transactions Over The Last Year

In the last twelve months, the biggest single purchase by an insider was when CEO, Chief Scientific Officer & Executive Director Heikki Lanckriet bought UK£1.2m worth of shares at a price of UK£13.25 per share. That means that even when the share price was higher than UK£7.20 (the recent price), an insider wanted to purchase shares. It's very possible they regret the purchase, but it's more likely they are bullish about the company. To us, it's very important to consider the price insiders pay for shares. Generally speaking, it catches our eye when insiders have purchased shares at above current prices, as it suggests they believed the shares were worth buying, even at a higher price. Notably Heikki Lanckriet was also the biggest seller.

Happily, we note that in the last year insiders paid UK£1.4m for 108.55k shares. But insiders sold 93.00k shares worth UK£1.2m. In total, 4basebio insiders bought more than they sold over the last year. You can see a visual depiction of insider transactions (by companies and individuals) over the last 12 months, below. If you click on the chart, you can see all the individual transactions, including the share price, individual, and the date!

Check out our latest analysis for 4basebio

AIM:4BB Insider Trading Volume September 23rd 2025

There are plenty of other companies that have insiders buying up shares. You probably do not want to miss this free list of undervalued small cap companies that insiders are buying.

Insider Ownership

I like to look at how many shares insiders own in a company, to help inform my view of how aligned they are with insiders. I reckon it's a good sign if insiders own a significant number of shares in the company. Insiders own 15% of 4basebio shares, worth about UK£16m. This level of insider ownership is good but just short of being particularly stand-out. It certainly does suggest a reasonable degree of alignment.

So What Do The 4basebio Insider Transactions Indicate?

There haven't been any insider transactions in the last three months -- that doesn't mean much. However, our analysis of transactions over the last year is heartening. Insiders own shares in 4basebio and we see no evidence to suggest they are worried about the future. While it's good to be aware of what's going on with the insider's ownership and transactions, we make sure to also consider what risks are facing a stock before making any investment decision. To that end, you should learn about the 4 warning signs we've spotted with 4basebio (including 1 which makes us a bit uncomfortable).

Of course 4basebio may not be the best stock to buy. So you may wish to see this free collection of high quality companies.

For the purposes of this article, insiders are those individuals who report their transactions to the relevant regulatory body. We currently account for open market transactions and private dispositions of direct interests only, but not derivative transactions or indirect interests.

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.