Sionna Therapeutics Inc (SION)

CUSIP: 829401108 | NYSE | Healthcare · Biotechnology | Small Cap | 195 institutional holders

Compare Detailed Historical Funds Options 13D/13G Peers Targeting Trading Summary Profile

Beneficial Ownership — 13D / 13G

5%+ stakes reported outside the quarterly cycle. A 13D is due within five business days of the event below, so these figures lead the holders table until the filer's next 13F catches up to them.

Holder	Shares	% of Class	Change	Event Date	vs 13F
13D/A RA Capital Management, L.P. with RA Capital Healthcare Fund, L.P., RA Capital Nexus Fund III, L.P.	6,476,193	14.3%	−3,595,519	Sep 17, 2026	9,905,045 sh (Jun 30, 2026)
13D/A Atlas Venture Associates XI, LLC

Institutional Holders — Q3 2026

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Y-Intercept (Hong Kong) Ltd1,056,885

0.1% of portfolio$5.6M

Citigroup Inc133,964

0.0% of portfolio$704.7K

Caitong International Asset Management Co., Ltd88,580

0.0% of portfolio$465.9K

Alps Advisors Inc59,475

0.0% of portfolio$312.8K

Dimensional Fund Advisors LP51,954

0.0% of portfolio$273.3K

Bank of New York Mellon Corp46,271

0.0% of portfolio$243.4K

Barclays PLC46,005

0.0% of portfolio$242.0K

Creative Planning43,381

0.0% of portfolio$228.2K

State of Alaska, Department of Revenue20,000

0.0% of portfolio$105

Simplex Trading, LLC13,194

0.0% of portfolio$69.4K

Principal Financial Group Inc11,267

0.0% of portfolio$59.3K

Chicago Partners Investment Group LLC10,699

0.0% of portfolio$38.5K

China Universal Asset Management Co., Ltd.8,249

0.0% of portfolio$42.5K

GF Fund Management Co. Ltd.6,667

0.0% of portfolio$35.1K

Strs Ohio4,900

0.0% of portfolio$25.8K

Mirae Asset Global Investments Co., Ltd.2,310

0.0% of portfolio$12.2K

Pinnacle Wealth Planning Services, Inc.1,350

0.0% of portfolio$7.1K

Mitsubishi UFJ Asset Management Co., Ltd.1,000

0.0% of portfolio$5.3K

Gamma Investing LLC925

0.0% of portfolio$4.9K

Farther Finance Advisors, LLC716

0.0% of portfolio$3.8K

US Bancorp \de\638

0.0% of portfolio$3.4K

Sterling Capital Management LLC605

0.0% of portfolio$3.2K

SJS Investment Consulting Inc.416

0.0% of portfolio$2.2K

PNC Financial Services Group, Inc.388

0.0% of portfolio$2.0K

EverSource Wealth Advisors, LLC387

0.0% of portfolio$2.0K

Nisa Investment Advisors, LLC342

0.0% of portfolio$1.8K

Essential Partners LLC326

0.0% of portfolio$1.7K

State of Wyoming262

0.0% of portfolio$1.4K

Signaturefd, LLC226

0.0% of portfolio$1.2K

Bare Financial Services, Inc224

0.0% of portfolio$1.2K

True Wealth Design, LLC165

0.0% of portfolio$868

Owl Creek Wealth Partners LLC160

0.0% of portfolio$842

Provenance Wealth Advisors, LLC116

0.0% of portfolio$610

Root Financial Partners, LLC80

0.0% of portfolio$421

Physician Wealth Advisors, Inc.70

0.0% of portfolio$369

Clearstead Advisors, LLC33

0.0% of portfolio$174

IFP Advisors, Inc18

0.0% of portfolio$95

Ascentis Wealth Management, LLC10

0.0% of portfolio$52

Covestor Ltd7

0.0% of portfolio$0

Contravisory Investment Management, Inc.6

0.0% of portfolio$32

				Style	Turnover	Location	Filed
Y-Intercept (Hong Kong) Ltd	1,056,885	$5.6M	0.1%	Value	Very High	Hong Kong, South Korea	2026-10-16
Citigroup Inc	133,964	$704.7K	0.0%	Core	Medium	New York, NY	2026-11-04
Caitong International Asset Management Co., Ltd	88,580	$465.9K	0.0%	Growth	Very High	Hong Kong, South Korea	2026-10-29
Alps Advisors Inc	59,475	$312.8K	0.0%	Yield	Low	Denver, CO	2026-11-03
Dimensional Fund Advisors LP	51,954	$273.3K	0.0%	Index	Low	Austin, TX	2026-11-04
Bank of New York Mellon Corp	46,271	$243.4K	0.0%	Core	Low	New York, NY	2026-11-05
Barclays PLC	46,005	$242.0K	0.0%	Core	Medium	London, United Kingdom	2026-11-06
Creative Planning	43,381	$228.2K	0.0%	Index	Very Low	Overland Park, KS	2026-11-02
State of Alaska, Department of Revenue	20,000	$105	0.0%	Core	Very Low	Juneau, AK	2026-10-15
Simplex Trading, LLC	13,194	$69.4K	0.0%	Core	Very High	Chicago, IL	2026-11-04
Principal Financial Group Inc	11,267	$59.3K	0.0%	Core	Low	Des Moines, IA	2026-11-02
Chicago Partners Investment Group LLC	10,699	$38.5K	0.0%	GARP	Low	Chicago, IL	2026-10-27
China Universal Asset Management Co., Ltd.	8,249	$42.5K	0.0%	Growth	Medium	Shanghai, France	2026-10-28
GF Fund Management Co. Ltd.	6,667	$35.1K	0.0%	Agg Growth	Medium	Guangzhou, France	2026-10-26
Strs Ohio	4,900	$25.8K	0.0%	Core	Medium	Columbus, OH	2026-10-30
Mirae Asset Global Investments Co., Ltd.	2,310	$12.2K	0.0%	Growth	Low	Seoul, Malaysia	2026-11-03
Pinnacle Wealth Planning Services, Inc.	1,350	$7.1K	0.0%	GARP	Low	Mansfield, OH	2026-10-27
Mitsubishi UFJ Asset Management Co., Ltd.	1,000	$5.3K	0.0%	Index	Very Low	Tokyo, Mexico	2026-11-05
Gamma Investing LLC	925	$4.9K	0.0%	Index	Very Low	Foster City, CA	2026-10-08
Farther Finance Advisors, LLC	716	$3.8K	0.0%	Index	Low	San Francisco, CA	2026-10-08
US Bancorp \de\	638	$3.4K	0.0%	Index	Low	Minneapolis, MN	2026-11-05
Sterling Capital Management LLC	605	$3.2K	0.0%	GARP	Medium	Charlotte, NC	2026-10-22
SJS Investment Consulting Inc.	416	$2.2K	0.0%	ETF	Very Low	Sylvania, OH	2026-10-26
PNC Financial Services Group, Inc.	388	$2.0K	0.0%	Growth	Very Low	Pittsburgh, PA	2026-11-06
EverSource Wealth Advisors, LLC	387	$2.0K	0.0%	Core	Medium	Birmingham, AL	2026-11-04
Nisa Investment Advisors, LLC	342	$1.8K	0.0%	Index	Very Low	St. Louis, MO	2026-10-20
Essential Partners LLC	326	$1.7K	0.0%	Value	Medium	Rancho Santa Fe, CA	2026-10-14
State of Wyoming	262	$1.4K	0.0%	Value	High	Cheyenne, WY	2026-10-28
Signaturefd, LLC	226	$1.2K	0.0%	Index	Low	Atlanta, GA	2026-10-23
Bare Financial Services, Inc	224	$1.2K	0.0%	ETF	Very Low	Gap, PA	2026-11-04
True Wealth Design, LLC	165	$868	0.0%	ETF	Medium	Akron, OH	2026-10-13
Owl Creek Wealth Partners LLC	160	$842	0.0%	Index	Low	Greenwood Village, CO	2026-10-20
Provenance Wealth Advisors, LLC	116	$610	0.0%	ETF	Low	Fort Lauderdale, FL	2026-10-30
Root Financial Partners, LLC	80	$421	0.0%	ETF	Medium	Encinitas, CA	2026-10-21
Physician Wealth Advisors, Inc.	70	$369	0.0%	ETF	Medium	Midvale, UT	2026-10-20
Clearstead Advisors, LLC	33	$174	0.0%	ETF	Low	Cleveland, OH	2026-11-06
IFP Advisors, Inc	18	$95	0.0%	Growth	Low	Tampa, FL	2026-10-16
Ascentis Wealth Management, LLC	10	$52	0.0%	Agg Growth	Low	Dallas, TX	2026-11-03
Covestor Ltd	7	$0	0.0%	Value	High	London, United Kingdom	2026-10-30
Contravisory Investment Management, Inc.	6	$32	0.0%	Momentum	High	Norwell, MA	2026-10-13