Sionna Therapeutics, Inc. (SION) insider trading

{
  "status": "OK",
  "results": [
    {
      "tickers": [
        "SION"
      ],
      "issuer_cik": "0002036042",
      "owner_cik": "0001619841",
      "accession_number": "0001231919-26-001201",
      "form_type": "4",
      "filing_date": "2026-09-21",
      "period_of_report": "2026-09-17",
      "issuer_name": "Sionna Therapeutics, Inc.",
      "issuer_trading_symbol": "SION",
      "owner_name": "Shah Rajeev M.",
      "is_director": true,
      "is_officer": false,
      "is_ten_percent_owner": true,
      "is_other": false,
      "security_type": "non_derivative",
      "record_type": "transaction",
      "security_title": "Common Stock",
      "transaction_timeliness": "O",
      "aff_10b5_one": false,
      "transaction_date": "2026-09-17",
      "transaction_code": "S",
      "equity_swap_involved": false,
      "transaction_shares": 33800,
      "transaction_price_per_share": 7.46,
      "transaction_acquired_disposed": "D",
      "shares_owned_following_transaction": 3448812,
      "transaction_value": 252148,
      "direct_or_indirect": "I",
      "nature_of_ownership": "See footnotes",
      "footnotes": [
        {
          "id": "F3",
          "description": "The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $7.30 to $7.68 inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."
        },
        {
          "id": "F1",
          "description": "RA Capital Management, L.P. (the \"Adviser\") is the investment manager for RA Capital Healthcare Fund, L.P. (the \"Fund\"), RA Capital Nexus Fund, L.P. (the \"Nexus Fund\"), RA Capital Nexus III Fund, L.P. (the \"Nexus Fund III\"), and a separately managed account (the \"Account\"). The general partner of the Adviser is RA Capital Management GP, LLC (the \"Adviser GP\"), of which Dr. Peter Kolchinsky and Mr. Rajeev Shah are the managing members. The Adviser, the Adviser GP, the Fund, the Nexus Fund, the Nexus Fund III, Dr. Kolchinsky and Mr. Shah disclaim beneficial ownership of any of the reported securities, except to the extent of their pecuniary interest therein."
        },
        {
          "id": "F2",
          "description": "Held directly by the Fund."
        }
      ],
      "remarks": "Dr. Joshua Resnick, a Partner of the Adviser, serves on the Issuer's board of directors."
    },
    {
      "tickers": [
        "SION"
      ],
      "issuer_cik": "0002036042",
      "owner_cik": "0001315082",
      "accession_number": "0001231919-26-001201",
      "form_type": "4",
      "filing_date": "2026-09-21",
      "period_of_report": "2026-09-17",
      "issuer_name": "Sionna Therapeutics, Inc.",
      "issuer_trading_symbol": "SION",
      "owner_name": "RA Capital Healthcare Fund LP",
      "is_director": true,
      "is_officer": false,
      "is_ten_percent_owner": false,
      "is_other": false,
      "security_type": "non_derivative",
      "record_type": "transaction",
      "security_title": "Common Stock",
      "transaction_timeliness": "O",
      "aff_10b5_one": false,
      "transaction_date": "2026-09-17",
      "transaction_code": "S",
      "equity_swap_involved": false,
      "transaction_shares": 3415011,
      "transaction_price_per_share": 6.32,
      "transaction_acquired_disposed": "D",
      "shares_owned_following_transaction": 3482612,
      "transaction_value": 21582869.52,
      "direct_or_indirect": "I",
      "nature_of_ownership": "See footnotes",
      "footnotes": [
        {
          "id": "F1",
          "description": "RA Capital Management, L.P. (the \"Adviser\") is the investment manager for RA Capital Healthcare Fund, L.P. (the \"Fund\"), RA Capital Nexus Fund, L.P. (the \"Nexus Fund\"), RA Capital Nexus III Fund, L.P. (the \"Nexus Fund III\"), and a separately managed account (the \"Account\"). The general partner of the Adviser is RA Capital Management GP, LLC (the \"Adviser GP\"), of which Dr. Peter Kolchinsky and Mr. Rajeev Shah are the managing members. The Adviser, the Adviser GP, the Fund, the Nexus Fund, the Nexus Fund III, Dr. Kolchinsky and Mr. Shah disclaim beneficial ownership of any of the reported securities, except to the extent of their pecuniary interest therein."
        },
        {
          "id": "F2",
          "description": "Held directly by the Fund."
        }
      ],
      "remarks": "Dr. Joshua Resnick, a Partner of the Adviser, serves on the Issuer's board of directors."
    }
  ]
}

// trimmed to 2 results

The response includes every Form 4 record; this page keeps open-market purchases and sales on common stock and removes duplicate joint-filer rows.