# Sionna Therapeutics, Inc. Common Stock (SION.US)

Canonical: https://gigainvestors.com/s/SION

Analysis as of: 2026-10-16T07:31:54.666Z. 

Listing currency: USD. Reporting currency: USD.

## Verdict

Not enough history yet

Quality tests for Buy: not passed (profit record: fail; earnings resilience is evidence only). Published buy qualification: no.

Share price: $4.08 per share; close as of 2026-10-15.

## Checklist

### understandable: na

### moat: na

### economics: na

### management: na

### accounting: na

## Holders

- [Andreas Halvorsen](https://gigainvestors.com/vg): tracked 13F investor; follow the investor page for holding quarter and amounts.

## Price story

Down 91% since Jul 2026 · "SION to Cut Workforce by Nearly Half After CF Study Failure, Stock Down" (finance.yahoo.com, Sep 2026)

Story as of 2026-10-16T09:59:35.010Z; price observation 2026-10-15.

- 2026-09-16: SION to Cut Workforce by Nearly Half After CF Study Failure, Stock Down ([finance.yahoo.com](https://finance.yahoo.com/healthcare/articles/sion-cut-workforce-nearly-half-152600291.html))

## Owner memo

Memo as of 2026-10-16T08:06:05.509Z.

### Where the cash goes

Paid no dividends in 1 year.

- Source: https://eodhd.com/financial-apis/stock-etfs-fundamental-data-feeds/ (filed 2026-03-02); Dividend observations: [[2025,0]]. Zero only counted when supported by a complete cash-flow statement.

### What the price says

The price is 0.5 times net assets; cash earnings are negative.

- Source: https://eodhd.com/financial-apis/stock-etfs-fundamental-data-feeds/ (filed 2026-03-02); Closing price 4.08 USD; reporting-to-trading FX 1; FY2025 net assets per share 7.678087895292355; price multiple 0.5313822992963599. FY2025 cash earnings/share -1.8767252413238993. Closing-price date 2026-10-15.

## Monthly share-price history (USD per share)

- 2025-02: $13.77 per share

- 2025-03: $10.46 per share

- 2025-04: $12.03 per share

- 2025-05: $13.69 per share

- 2025-06: $17.35 per share

- 2025-07: $16.76 per share

- 2025-08: $24.62 per share

- 2025-09: $29.41 per share

- 2025-10: $38.21 per share

- 2025-11: $43.57 per share

- 2025-12: $41.14 per share

- 2026-01: $42.26 per share

- 2026-02: $36.54 per share

- 2026-03: $40.09 per share

- 2026-04: $38.70 per share

- 2026-05: $42.82 per share

- 2026-06: $43.99 per share

- 2026-07: $47.13 per share

- 2026-08: $6.03 per share

- 2026-09: $5.26 per share

- 2026-10: $4.08 per share

## Annual estimated value (USD per share)

Historical values use today's bond yield for every fiscal year

Historical values use today's FX rate into trading currency for every fiscal year

Historical values use current restated fundamentals and current commodity classification; they are not point-in-time estimates

## Sources

[Original 10-K filing](https://www.sec.gov/Archives/edgar/data/2036042/000162828026012996/sionna-20251231.htm); period 2025-12-31, filed 2026-03-02.

Estimates depend on assumptions and are not guarantees or investment advice. Underlying data remains subject to its source licenses; public reading does not grant bulk redistribution rights.

## Reported holder observations

- [Andreas Halvorsen](https://gigainvestors.com/vg): 3,195,181 SION shares; USD 140,556,000 reported position value; 0.4% of portfolio; hold; quarter 2026 Q2.

# SION — Sionna Therapeutics Inc

Held by 1 investor · USD 140,556,000 total · 2026 Q2 · reported price USD 43.99 (split-adjusted).
Page: https://gigainvestors.com/s/SION

## Holders (2026 Q2)

| Investor | Value | % of their portfolio | This quarter |
|---|---:|---:|---|
| Andreas Halvorsen (https://gigainvestors.com/vg) | USD 140,556,000 | 0.4% | hold |

## Total held by quarter

- 2025 Q1: USD 30,885,807 · 1 holder · USD 10.46
- 2025 Q2: USD 55,436,390 · 1 holder · USD 17.35
- 2025 Q3: USD 93,970,273 · 1 holder · USD 29.41
- 2025 Q4: USD 131,449,746 · 1 holder · USD 41.14
- 2026 Q1: USD 128,094,806 · 1 holder · USD 40.09
- 2026 Q2: USD 140,556,000 · 1 holder · USD 43.99