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Sionna Therapeutics, Inc. (SION)

Healthcare | Biotechnology | Waltham, United States | NasdaqGM
3.89 USD -0.19 (-4.657%) ⇩ (Oct. 16, 2026, 4 p.m. EDT)
After hours: 3.87 -0.02 (-0.020%) ⇩ (Oct. 16, 2026, 7:17 p.m. EDT)

Short-term:★★⯪☆☆Long-term:★★⯪☆☆Dividends:☆☆☆☆☆
Hot Take ↕ | Oct. 10, 2026, 1:13 a.m. EDT

The investment case for Sionna Therapeutics is currently paralyzed by a stark disconnect between its clinical potential and its financial reality. While the company boasts a fortress-like balance sheet with a current ratio of 20 and negligible debt, allowing it to weather the storm of R&D without immediate distress, the stock is fundamentally broken by years of value destruction. The price has collapsed from nearly $55 to under $5, reflecting a market verdict that the current pipeline execution or commercialization timeline is insufficient to justify a premium valuation. This is not a classic value trap where the business is great but the price is low; rather, the multi-year trajectory indicates a structural failure in the market's assessment of the company's ability to deliver on its cystic fibrosis promises. The short-term outlook remains murky due to this structural uncertainty. Despite recent headlines of breakouts and analyst initiations, the technical picture shows the stock trading well below its 50-day and 200-day averages, indicating persistent selling pressure. The statistical forecasting models offer no directional guidance, citing very low reliability, which aligns with the chaotic nature of biotech price action driven by binary clinical events. Without a confirmed catalyst that can reverse the multi-year decline, the stock lacks the momentum required for a high-conviction entry. Regarding income, there is no dividend to speak of. The company is burning cash, with negative free cash flow and negative returns on equity, meaning capital is being deployed entirely into growth rather than returned to shareholders. The options market confirms this tension: while some traders are hedging against a further collapse with deep puts, others are buying distant calls hoping for a miraculous turnaround, creating a volatile environment unsuitable for steady investors. Until the company demonstrates sustained revenue growth or a definitive shift in the market's perception of its asset value, the long-term rating remains neutral, as the fundamental risks of clinical failure or delayed commercialization still outweigh the safety of the balance sheet.

Model Selection — Backtest MAE (log-scale, lower is better)
ModelMAE
AutoETS ✓0.183443
AutoARIMA0.183445
MSTL0.200127
AutoTheta0.255036

Forecast horizon: 45 days | Selected: AutoETS

Forecast Reliability
Score 26%
H-stat 10.69
Ljung-Box p 0.000
Jarque-Bera p 0.649
Excess Kurtosis -0.66
Attribute Value
Sector Healthcare
Debt to Equity Ratio 3.036
Market Cap 175,876,240
Forward P/E -1.74
Website https://www.sionnatx.com

As of Oct. 10, 2026, 1:13 a.m. EDT: Speculators are aggressively betting on a massive downside event, evidenced by heavy volume and open interest in deep out-of-the-money puts (strikes $30-$40) expiring in late 2026, which dwarf any call activity at those levels. Conversely, there is significant call open interest at strikes far above the current price ($17.50, $55.00), suggesting a 'long gamma' or lottery-ticket strategy where traders are willing to pay for a massive upside move to offset their put exposure, creating a volatile environment with asymmetric risk.


Info Dump

Attribute Value
52 Week Change -0.87919253
Address1 21 Hickory Drive
Address2 Suite 500
All Time High 54.97
All Time Low 3.775
Ask 64.74
Ask Size 2
Audit Risk 7
Average Daily Volume10 Day 1,019,610
Average Daily Volume3 Month 2,223,743
Average Volume 2,223,743
Average Volume10Days 1,019,610
Bid 35.98
Bid Size 2
Board Risk 5
Book Value 5.885
City Waltham
Compensation As Of Epoch Date 1,767,139,200
Compensation Risk 9
Country United States
Crypto Tradeable 0
Currency USD
Current Price 3.89
Current Ratio 20.045
Custom Price Alert Confidence HIGH
Date Short Interest 1,790,726,400
Day High 4.06
Day Low 3.775
Debt To Equity 3.036
Display Name Sionna Therapeutics
Dividend Yield 0.0
Earnings Timestamp 1,786,019,400
Earnings Timestamp End 1,793,881,800
Earnings Timestamp Start 1,793,881,800
Ebitda -108,836,000
Ebitda Margins 0.0
Enterprise To Ebitda 0.249
Enterprise Value -27,085,768
Eps Current Year -2.446
Eps Forward -2.231
Eps Trailing Twelve Months -2.16
Esg Populated 0
Exchange NGM
Exchange Data Delayed By 15
Exchange Timezone Name America/New_York
Exchange Timezone Short Name EDT
Fifty Day Average 6.7384
Fifty Day Average Change -2.8483999
Fifty Day Average Change Percent -0.4227116
Fifty Two Week Change Percent -87.91925
Fifty Two Week High 54.97
Fifty Two Week High Change -51.08
Fifty Two Week High Change Percent -0.92923415
Fifty Two Week Low 3.775
Fifty Two Week Low Change 0.11500001
Fifty Two Week Low Change Percent 0.030463578
Fifty Two Week Range 3.775 - 54.97
Financial Currency USD
First Trade Date Milliseconds 1,738,938,600,000
Float Shares 20,474,887
Forward Eps -2.231
Forward P E -1.7436128
Free Cashflow -45,443,752
Full Exchange Name NasdaqGM
Full Time Employees 59
Fullday Change -0.21000004
Fullday Change Percent -5.14706
Fullday Price 3.89
Gmt Off Set Milliseconds -14,400,000
Governance Epoch Date 1,790,812,800
Gross Margins 0.0
Has Pre Post Market Data 1
Held Percent Insiders 0.07877
Held Percent Institutions 1.01604
Implied Shares Outstanding 45,212,399
Industry Biotechnology
Industry Disp Biotechnology
Industry Key biotechnology
Ipo Expected Date 2,025-02-07
Is Earnings Date Estimate 1
Language en-US
Last Fiscal Year End 1,767,139,200
Long Business Summary Sionna Therapeutics, Inc., a clinical-stage biopharmaceutical company, researches and develops medicines for the treatment of cystic fibrosis (CF). It develops galicaftor (SION-2222), a transmembrane domain 1 (TMD1)-directed cystic fibrosis transmembrane conductance regulator (CFTR) that has completed Phase 2 trial; navocaftor (SION-3067), a potentiator that has completed Phase 2 trial; SION-109, an intracellular loop 4 directed CFTR corrector that has completed Phase 1 trial; SION-2851, a TMD1-directed CFTR corrector that has completed Phase 1 trial; SION-451, which is nucleotide-binding domain 1 stabilizer in Phase 1 trial; and SION-719, which is nucleotide-binding domain 1 stabilizer in Phase 2a proof-of-concept trial. The company was formerly known as Sling Therapeutics, Inc. and changed its name to Sionna Therapeutics, Inc. in July 2021. Sionna Therapeutics, Inc. was incorporated in 2019 and is headquartered in Waltham, Massachusetts.
Long Name Sionna Therapeutics, Inc.
Market us_market
Market Cap 175,876,240
Market State CLOSED
Max Age 86,400
Message Board Id finmb_1779769831
Most Recent Quarter 1,782,777,600
Net Income To Common -97,383,000
Next Fiscal Year End 1,798,675,200
Non Diluted Market Cap 248,668,194
Number Of Analyst Opinions 7
Open 4.06
Operating Cashflow -75,916,000
Operating Margins 0.0
Overall Risk 7
Phone 617 819 2020
Post Market Change -0.02000022
Post Market Change Percent -0.5141444
Post Market Price 3.87
Post Market Time 1,792,192,623
Previous Close 4.08
Price Eps Current Year -1.5903516
Price Hint 4
Price To Book 0.6610025
Profit Margins 0.0
Quick Ratio 19.573
Quote Source Name Nasdaq Real Time Price
Quote Type EQUITY
Recommendation Key none
Region US
Regular Market Change -0.19
Regular Market Change Percent -4.65686
Regular Market Day High 4.06
Regular Market Day Low 3.775
Regular Market Day Range 3.775 - 4.06
Regular Market Open 4.06
Regular Market Previous Close 4.08
Regular Market Price 3.89
Regular Market Time 1,792,180,800
Regular Market Volume 1,483,533
Return On Assets -0.21542
Return On Equity -0.32342
Sand P52 Week Change 0.13723719
Sector Healthcare
Sector Disp Healthcare
Sector Key healthcare
Share Holder Rights Risk 8
Shares Outstanding 45,212,399
Shares Percent Shares Out 0.084
Shares Short 3,797,732
Shares Short Previous Month Date 1,788,134,400
Shares Short Prior Month 4,298,665
Short Name Sionna Therapeutics, Inc.
Short Percent Of Float 0.1363
Short Ratio 2.55
Source Interval 15
State MA
Symbol SION
Target High Price 63.0
Target Low Price 5.0
Target Mean Price 21.0
Target Median Price 6.0
Total Cash 211,031,008
Total Cash Per Share 4.668
Total Debt 8,069,000
Tradeable 0
Trailing Annual Dividend Rate 0.0
Trailing Annual Dividend Yield 0.0
Trailing Eps -2.16
Trailing Peg Ratio None
Triggerable 1
Two Hundred Day Average 31.87025
Two Hundred Day Average Change -27.980251
Two Hundred Day Average Change Percent -0.8779426
Type Disp Equity
Volume 1,483,533
Website https://www.sionnatx.com
Zip 2,451