SION· Sionna Therapeutics Inc.

CUSIP 829401108·Sector Healthcare →·

·Investor Relations ↗

Current price

$44.23

Market cap

$2.0B

52w low

$11.77

52w high

$46.46

Whale holders

Aggregate held

$133M

Net flow (Q/Q)

$38M

Insider buys/sells · last 6 mo · open market only

	Transactions	Total $
Buys	0	$0
Sells	11	$51M

Whale	% of portfolio	Recent activity	Δ shares	Value
Viking Global Investors LP	0.3%	Hold	0	$131M
Polen Capital Management LLC	0.0%	Hold	0	$1M

Held alongside SION

Top stocks SION's whales also own — ranked by holder overlap

MSFTMicrosoft Corp.· 2 shared AMZNAmazon Com Inc.· 2 shared VVisa, Inc.· 2 shared TSMTaiwan Semiconductor Mfg Ltd.· 2 shared BBIOBridgebio Pharma Inc.· 2 shared AONAon Plc· 2 shared GOOGLAlphabet Inc.· 2 shared TSLATesla Inc.· 2 shared BSXBoston Scientific Corp.· 2 shared ADPTAdaptive Biotechnologies Cor· 2 shared

Quarterly ownership history

Last 4 quarters

Quarter	Whales	Aggregate	Buying	Selling	Net flow
2025-12-31	2	$133M	2 · $38M	0 · $0	$38M
2025-09-30	2	$95M	2 · $39M	0 · $0	$39M
2025-06-30	2	$56M	2 · $25M	0 · $0	$25M
2025-03-31	1	$31M	1 · $31M	0 · $0	$31M

SION Financials

Live via yfinance — refreshed daily.

Valuation

Market capitalization$2.0B

Enterprise value$1.8B

EV / EBITDA (TTM)-19.96

P/E ratio (TTM)—

Forward P/E-17.52

P/S ratio—

P/B ratio6.45

PEG ratio—

Cash Flow

Operating cash flow (TTM)-$66M

Free cash flow (TTM)-$44M

Total cash$236M

Total debt$9M

Debt / equity2.83

Current ratio20.61

Income Statement

Total revenue (TTM)—

Revenue per share (TTM)—

Gross profit (TTM)—

EBITDA (TTM)-$88M

Net income (TTM)-$75M

EPS diluted (TTM)-1.88

Shares outstanding45,142,330

Float shares16,441,846

Profitability

Gross margin0.00%

Operating margin0.00%

EBITDA margin0.00%

Net margin0.00%

Efficiency

Return on assets (TTM)-21.74%

Return on equity (TTM)-31.79%

Price History

Current price$44.23

52 Week high$46.46

52 Week low$11.77

50 day average$38.70

200 day average$34.66

Average volume (10 day)395,750

1-year beta—

1-year price target$50.60

Dividends

Dividend yield—

Dividend rate (annual)—

Payout ratio0.00%

Fundamentals are sourced from yfinance and refreshed daily. Last updated May 10, 2026, 5:41 PM. Empty cells (—) mean yfinance doesn't have that field for this ticker (common for ADRs, recent IPOs, or non-applicable ratios).

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