Stock Analysis

ABIONYX Pharma SA (EPA:ABNX) surges 32%; retail investors who own 55% shares profited along with insiders

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Key Insights

  • ABIONYX Pharma's significant retail investors ownership suggests that the key decisions are influenced by shareholders from the larger public
  • A total of 9 investors have a majority stake in the company with 45% ownership
  • 33% of ABIONYX Pharma is held by insiders

To get a sense of who is truly in control of ABIONYX Pharma SA (EPA:ABNX), it is important to understand the ownership structure of the business. The group holding the most number of shares in the company, around 55% to be precise, is retail investors. In other words, the group stands to gain the most (or lose the most) from their investment into the company.

While retail investors were the group that reaped the most benefits after last week’s 32% price gain, insiders also received a 33% cut.

In the chart below, we zoom in on the different ownership groups of ABIONYX Pharma.

View our latest analysis for ABIONYX Pharma

ownership-breakdown
ENXTPA:ABNX Ownership Breakdown October 28th 2025

What Does The Institutional Ownership Tell Us About ABIONYX Pharma?

Many institutions measure their performance against an index that approximates the local market. So they usually pay more attention to companies that are included in major indices.

Less than 5% of ABIONYX Pharma is held by institutional investors. This suggests that some funds have the company in their sights, but many have not yet bought shares in it. If the company is growing earnings, that may indicate that it is just beginning to catch the attention of these deep-pocketed investors. It is not uncommon to see a big share price rise if multiple institutional investors are trying to buy into a stock at the same time. So check out the historic earnings trajectory, below, but keep in mind it's the future that counts most.

earnings-and-revenue-growth
ENXTPA:ABNX Earnings and Revenue Growth October 28th 2025

Hedge funds don't have many shares in ABIONYX Pharma. The company's largest shareholder is Emmanuel Huynh, with ownership of 13%. With 6.7% and 6.0% of the shares outstanding respectively, Orsay 53 SAS and Sadok Belmokhtar are the second and third largest shareholders. In addition, we found that Cyrille Tupin, the CEO has 4.6% of the shares allocated to their name.

Our studies suggest that the top 9 shareholders collectively control less than half of the company's shares, meaning that the company's shares are widely disseminated and there is no dominant shareholder.

While it makes sense to study institutional ownership data for a company, it also makes sense to study analyst sentiments to know which way the wind is blowing. While there is some analyst coverage, the company is probably not widely covered. So it could gain more attention, down the track.

Insider Ownership Of ABIONYX Pharma

The definition of company insiders can be subjective and does vary between jurisdictions. Our data reflects individual insiders, capturing board members at the very least. Company management run the business, but the CEO will answer to the board, even if he or she is a member of it.

Insider ownership is positive when it signals leadership are thinking like the true owners of the company. However, high insider ownership can also give immense power to a small group within the company. This can be negative in some circumstances.

It seems insiders own a significant proportion of ABIONYX Pharma SA. Insiders have a €50m stake in this €154m business. It is great to see insiders so invested in the business. It might be worth checking if those insiders have been buying recently.

General Public Ownership

The general public -- including retail investors -- own 55% of ABIONYX Pharma. With this amount of ownership, retail investors can collectively play a role in decisions that affect shareholder returns, such as dividend policies and the appointment of directors. They can also exercise the power to vote on acquisitions or mergers that may not improve profitability.

Private Company Ownership

It seems that Private Companies own 6.7%, of the ABIONYX Pharma stock. It might be worth looking deeper into this. If related parties, such as insiders, have an interest in one of these private companies, that should be disclosed in the annual report. Private companies may also have a strategic interest in the company.

Next Steps:

I find it very interesting to look at who exactly owns a company. But to truly gain insight, we need to consider other information, too. Like risks, for instance. Every company has them, and we've spotted 4 warning signs for ABIONYX Pharma (of which 3 don't sit too well with us!) you should know about.

If you are like me, you may want to think about whether this company will grow or shrink. Luckily, you can check this free report showing analyst forecasts for its future.

NB: Figures in this article are calculated using data from the last twelve months, which refer to the 12-month period ending on the last date of the month the financial statement is dated. This may not be consistent with full year annual report figures.

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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.