Sionna Therapeutics, Inc.

NasdaqGM:SION Stock Report

Market Cap: US$2.1b

Sionna Therapeutics Ownership

Who are the major shareholders and have insiders been buying or selling?

Recent Insider Transactions

NasdaqGM:SION Recent Insider Transactions by Companies or Individuals
DateValueNameEntityRoleSharesMax Price
17 Apr 26SellUS$2,341,098OrbiMed Advisors LLCCompany52,397US$44.68
03 Feb 26SellUS$1,379,866OrbiMed Advisors LLCCompany30,953US$44.58
22 Jan 26SellUS$10,000,000TPG Capital, L.P.Company250,000US$40.00
24 Dec 25SellUS$1,486,010OrbiMed Advisors LLCCompany33,356US$44.55
19 Dec 25SellUS$83,428OrbiMed Advisors LLCCompany1,875US$44.50
26 Nov 25SellUS$4,814,205OrbiMed Advisors LLCCompany108,073US$44.60
21 Nov 25SellUS$1,200,704RA Capital Management, L.P.Company30,316US$40.50
19 Nov 25SellUS$5,498,899RA Capital Management, L.P.Company136,320US$42.10
19 Nov 25SellUS$1,259RA Capital Management, L.P.Company31US$40.61
28 Oct 25SellUS$14,762,604RA Capital Management, L.P.Company373,610US$39.58
21 Oct 25SellUS$153,251Atlas Venture Advisors, Inc.Company4,688US$32.69
20 Oct 25SellUS$515,091Atlas Venture Advisors, Inc.Company16,071US$33.47
10 Oct 25SellUS$105,260Atlas Venture Advisors, Inc.Company3,511US$29.98
03 Oct 25SellUS$196,440Atlas Venture Advisors, Inc.Company6,548US$30.00
29 Sep 25SellUS$345,072Atlas Venture Advisors, Inc.Company11,468US$30.09

Insider Trading Volume

Insider Buying: Insufficient data to determine if insiders have bought more shares than they have sold in the past 3 months.

Ownership Breakdown

What is the ownership structure of SION?
Owner TypeNumber of SharesOwnership Percentage
Individual Insiders647,5551.35%
Private Companies2,478,0305.17%
Hedge Funds2,952,7546.16%
Institutions19,513,86740.7%
VC/PE Firms22,311,11346.6%

Dilution of Shares: Shareholders have not been meaningfully diluted in the past year.

Top Shareholders

Top 25 shareholders own 95.21% of the company
OwnershipNameSharesCurrent ValueChange %Portfolio %
22.3%
RA Capital Management, L.P.
10,071,712US$474.7m1.68%4.87%
14.8%
TPG Capital, L.P.
6,684,962US$315.1m2.93%1.38%
6.83%
Atlas Venture Advisors, Inc.
3,084,480US$145.4m2.97%17.86%
6.54%
Viking Global Investors LP
2,952,754US$139.2m-7.59%0.35%
5.49%
Enavate Sciences
2,478,030US$116.8m0%no data
5.47%
OrbiMed Advisors LLC
2,469,959US$116.4m-30%1.63%
4.47%
Qatar Holding LLC
2,020,258US$95.2m-8.58%0.11%
3.21%
Jennison Associates LLC
1,451,220US$68.4m30.1%0.04%
3.18%
JP Morgan Asset Management
1,433,908US$67.6m20.2%0.01%
2.87%
BlackRock, Inc.
1,295,867US$61.1m0.33%no data
2.58%
Citadel Advisors LLC
1,166,931US$55.0m7.32%0.04%
2.28%
Vanguard Capital Management, LLC
1,029,497US$48.5m0%no data
2.15%
Deerfield Management Company, L.P.
970,590US$45.7m0%0.79%
1.68%
T. Rowe Price Group, Inc.
756,376US$35.6m-9.02%no data
1.67%
State Street Global Advisors, Inc.
756,227US$35.6m9.06%no data
1.46%
Perceptive Advisors LLC
658,439US$31.0m-44.2%0.55%
1.43%
Eventide Asset Management, LLC
645,530US$30.4m1.01%0.41%
1.25%
Aberdeen Group Plc
564,175US$26.6m-32.8%0.01%
1.21%
Michael Cloonan
547,343US$25.8m0%no data
0.89%
Baker Bros. Advisors LP
400,000US$18.9m0%0.09%
0.86%
Geode Capital Management, LLC
389,872US$18.4m2.59%no data
0.66%
Artal Group S.A.
300,000US$14.1m0%0.22%
0.65%
Sio Capital Management, LLC
294,340US$13.9m0%1.63%
0.65%
Soleus Capital Management, L.P.
293,500US$13.8m9.31%0.43%
0.6%
Norges Bank Investment Management
270,343US$12.7m0%no data

Company Analysis and Financial Data Status

DataLast Updated (UTC time)
Company Analysis2026/08/01 14:48
End of Day Share Price 2026/07/31 00:00
Earnings2026/03/31
Annual Earnings2025/12/31

Data Sources

The data used in our company analysis is from S&P Global Market Intelligence LLC. The following data is used in our analysis model to generate this report. Data is normalised which can introduce a delay from the source being available.

PackageDataTimeframeExample US Source *
Company Financials10 years
  • Income statement
  • Cash flow statement
  • Balance sheet
Analyst Consensus Estimates+3 years
  • Forecast financials
  • Analyst price targets
Market Prices30 years
  • Stock prices
  • Dividends, Splits and Actions
Ownership10 years
  • Top shareholders
  • Insider trading
Management10 years
  • Leadership team
  • Board of directors
Key Developments10 years
  • Company announcements

* Example for US securities, for non-US equivalent regulatory forms and sources are used.

Unless specified all financial data is based on a yearly period but updated quarterly. This is known as Trailing Twelve Month (TTM) or Last Twelve Month (LTM) Data. Learn more.

Analysis Model and Snowflake

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Learn about the world class team who designed and built the Simply Wall St analysis model.

Industry and Sector Metrics

Our industry and section metrics are calculated every 6 hours by Simply Wall St, details of our process are available on Github.

Analyst Sources

Sionna Therapeutics, Inc. is covered by 12 analysts. 10 of those analysts submitted the estimates of revenue or earnings used as inputs to our report. Analysts submissions are updated throughout the day.

AnalystInstitution
Kambiz YazdiBTIG
Jonathan WollebenCitizens JMP Securities, LLC
Ilya ZubkovFreedom Broker