Private equity firms invested in Sionna Therapeutics, Inc. (NASDAQ:SION) copped the brunt of last week's US$56m market cap decline

Simply Wall St

Key Insights

  • Sionna Therapeutics' significant private equity firms ownership suggests that the key decisions are influenced by shareholders from the larger public
  • A total of 4 investors have a majority stake in the company with 56% ownership
  • 10% of Sionna Therapeutics is held by Institutions

To get a sense of who is truly in control of Sionna Therapeutics, Inc. (NASDAQ:SION), it is important to understand the ownership structure of the business. With 56% stake, private equity firms possess the maximum shares in the company. That is, the group stands to benefit the most if the stock rises (or lose the most if there is a downturn).

As market cap fell to US$555m last week, private equity firms would have faced the highest losses than any other shareholder groups of the company.

Let's delve deeper into each type of owner of Sionna Therapeutics, beginning with the chart below.

See our latest analysis for Sionna Therapeutics

NasdaqGM:SION Ownership Breakdown May 10th 2025

What Does The Institutional Ownership Tell Us About Sionna Therapeutics?

Institutions typically measure themselves against a benchmark when reporting to their own investors, so they often become more enthusiastic about a stock once it's included in a major index. We would expect most companies to have some institutions on the register, especially if they are growing.

Sionna Therapeutics already has institutions on the share registry. Indeed, they own a respectable stake in the company. This suggests some credibility amongst professional investors. But we can't rely on that fact alone since institutions make bad investments sometimes, just like everyone does. If multiple institutions change their view on a stock at the same time, you could see the share price drop fast. It's therefore worth looking at Sionna Therapeutics' earnings history below. Of course, the future is what really matters.

NasdaqGM:SION Earnings and Revenue Growth May 10th 2025

It looks like hedge funds own 6.7% of Sionna Therapeutics 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. RA Capital Management, L.P. is currently the largest shareholder, with 24% of shares outstanding. For context, the second largest shareholder holds about 15% of the shares outstanding, followed by an ownership of 8.4% by the third-largest shareholder. In addition, we found that Michael Cloonan, the CEO has 1.2% of the shares allocated to their name.

Our research also brought to light the fact that roughly 56% of the company is controlled by the top 4 shareholders suggesting that these owners wield significant influence on the business.

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 plenty of analysts covering the stock, so it might be worth seeing what they are forecasting, too.

Insider Ownership Of Sionna Therapeutics

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. The company management answer to the board and the latter should represent the interests of shareholders. Notably, sometimes top-level managers are on the board themselves.

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 Sionna Therapeutics, Inc.. As individuals, the insiders collectively own US$8.8m worth of the US$555m company. It is good to see some investment by insiders, but it might be worth checking if those insiders have been buying.

General Public Ownership

The general public-- including retail investors -- own 26% stake in the company, and hence can't easily be ignored. While this group can't necessarily call the shots, it can certainly have a real influence on how the company is run.

Private Equity Ownership

With an ownership of 56%, private equity firms are in a position to play a role in shaping corporate strategy with a focus on value creation. Some might like this, because private equity are sometimes activists who hold management accountable. But other times, private equity is selling out, having taking the company public.

Next Steps:

It's always worth thinking about the different groups who own shares in a company. But to understand Sionna Therapeutics better, we need to consider many other factors. For instance, we've identified 4 warning signs for Sionna Therapeutics (2 don't sit too well with us) that you should be aware of.

Ultimately the future is most important. You can access this free report on analyst forecasts for the company.

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.