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AC Immune SA's (NASDAQ:ACIU) stock price dropped 11% last week; retail investors would not be happy

Simply Wall St·12/10/2025 10:11:29
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Key Insights

  • Significant control over AC Immune by retail investors implies that the general public has more power to influence management and governance-related decisions
  • A total of 4 investors have a majority stake in the company with 55% ownership
  • Using data from analyst forecasts alongside ownership research, one can better assess the future performance of a company

If you want to know who really controls AC Immune SA (NASDAQ:ACIU), then you'll have to look at the makeup of its share registry. With 37% stake, retail investors possess the maximum shares in the company. Put another way, the group faces the maximum upside potential (or downside risk).

And last week, retail investors endured the biggest losses as the stock fell by 11%.

Let's take a closer look to see what the different types of shareholders can tell us about AC Immune.

Check out our latest analysis for AC Immune

ownership-breakdown
NasdaqGM:ACIU Ownership Breakdown December 10th 2025

What Does The Institutional Ownership Tell Us About AC Immune?

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.

As you can see, institutional investors have a fair amount of stake in AC Immune. This can indicate that the company has a certain degree of credibility in the investment community. However, it is best to be wary of relying on the supposed validation that comes with institutional investors. They too, get it wrong sometimes. It is not uncommon to see a big share price drop if two large institutional investors try to sell out of a stock at the same time. So it is worth checking the past earnings trajectory of AC Immune, (below). Of course, keep in mind that there are other factors to consider, too.

earnings-and-revenue-growth
NasdaqGM:ACIU Earnings and Revenue Growth December 10th 2025

It looks like hedge funds own 20% of AC Immune shares. That catches my attention because hedge funds sometimes try to influence management, or bring about changes that will create near term value for shareholders. BVF Partners L.P. is currently the company's largest shareholder with 20% of shares outstanding. In comparison, the second and third largest shareholders hold about 16% and 12% of the stock. Additionally, the company's CEO Andrea Pfeifer directly holds 3.0% of the total shares outstanding.

To make our study more interesting, we found that the top 4 shareholders control more than half of the company which implies that this group has considerable sway over the company's decision-making.

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. There are a reasonable number of analysts covering the stock, so it might be useful to find out their aggregate view on the future.

Insider Ownership Of AC Immune

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. Management ultimately answers to the board. However, it is not uncommon for managers to be executive board members, especially if they are a founder or the CEO.

Most consider insider ownership a positive because it can indicate the board is well aligned with other shareholders. However, on some occasions too much power is concentrated within this group.

We can report that insiders do own shares in AC Immune SA. As individuals, the insiders collectively own US$7.5m worth of the US$251m company. This shows at least some alignment. You can click here to see if those insiders have been buying or selling.

General Public Ownership

The general public, who are usually individual investors, hold a 37% stake in AC Immune. This size of ownership, while considerable, may not be enough to change company policy if the decision is not in sync with other large shareholders.

Private Equity Ownership

Private equity firms hold a 29% stake in AC Immune. This suggests they can be influential in key policy decisions. Some investors might be encouraged by this, since private equity are sometimes able to encourage strategies that help the market see the value in the company. Alternatively, those holders might be exiting the investment after taking it public.

Private Company Ownership

It seems that Private Companies own 6.5%, of the AC Immune stock. It's hard to draw any conclusions from this fact alone, so its worth looking into who owns those private companies. Sometimes insiders or other related parties have an interest in shares in a public company through a separate private 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. Consider risks, for instance. Every company has them, and we've spotted 1 warning sign for AC Immune you should know about.

But ultimately it is the future, not the past, that will determine how well the owners of this business will do. Therefore we think it advisable to take a look at this free report showing whether analysts are predicting a brighter 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.