Michael Cloonan, President and CEO of Sionna Therapeutics, Inc. ($SION), sold about $6.3 million in company shares across 12 open market transactions over the last year. His most recent sale occurred on October 21, 2025. These sales rank him 1,625th among 11,678 insiders by total value sold, below the average of $8.6 million per insider and 6.4 transactions. Cloonan made no open market purchases during this period.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan. 2, 2026 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | A | Non-Qualified Stock Option (right to buy) | 436100 | $0.00 | 436,100.0000 | 44,628,788 | 9999.99% | 0.98% |
| Oct. 21, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | M | Non-Qualified Stock Option (right to buy) | 33532 | $0.00 | 53,142.0000 | 0 | 38.69% | 0.00% |
| Oct. 21, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | M | Non-Qualified Stock Option (right to buy) | 22895 | $0.00 | 86,674.0000 | 0 | 20.90% | 0.00% |
| Oct. 21, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | M | Non-Qualified Stock Option (right to buy) | 30049 | $0.00 | 109,569.0000 | 0 | 21.52% | 0.00% |
| Oct. 21, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | M | Non-Qualified Stock Option (right to buy) | 13324 | $0.00 | 139,618.0000 | 0 | 8.71% | 0.00% |
| Oct. 21, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | S | Common Stock | 33532 | $37.31 | 547,343.0000 | 0 | 5.77% | 0.00% |
| Oct. 21, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | M | Common Stock | 33532 | $6.11 | 580,875.0000 | 0 | 6.13% | 0.00% |
| Oct. 21, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | S | Common Stock | 22895 | $36.60 | 547,343.0000 | 0 | 4.01% | 0.00% |
| Oct. 21, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | M | Common Stock | 22895 | $6.11 | 570,238.0000 | 0 | 4.18% | 0.00% |
| Oct. 21, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | S | Common Stock | 30049 | $35.63 | 547,343.0000 | 0 | 5.20% | 0.00% |
| Oct. 21, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | M | Common Stock | 30049 | $6.11 | 577,392.0000 | 0 | 5.49% | 0.00% |
| Oct. 21, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | M | Common Stock | 13324 | $6.11 | 560,667.0000 | 0 | 2.43% | 0.00% |
| Oct. 21, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | S | Common Stock | 13324 | $34.44 | 547,343.0000 | 0 | 2.38% | 0.00% |
| Oct. 16, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | S | Common Stock | 10225 | $31.46 | 547,343.0000 | 0 | 1.83% | 0.00% |
| Oct. 15, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | M | Common Stock | 14775 | $6.11 | 562,118.0000 | 0 | 2.70% | 0.00% |
| Oct. 15, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | S | Common Stock | 14775 | $31.11 | 547,343.0000 | 0 | 2.63% | 0.00% |
| Oct. 16, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | M | Common Stock | 10225 | $6.11 | 557,568.0000 | 0 | 1.87% | 0.00% |
| Oct. 16, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | M | Common Stock | 200 | $6.11 | 547,543.0000 | 0 | 0.04% | 0.00% |
| Oct. 16, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | S | Common Stock | 200 | $34.00 | 547,343.0000 | 0 | 0.04% | 0.00% |
| Oct. 15, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | M | Non-Qualified Stock Option (right to buy) | 14775 | $0.00 | 163,367.0000 | 0 | 8.29% | 0.00% |
| Oct. 16, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | M | Non-Qualified Stock Option (right to buy) | 10225 | $0.00 | 153,142.0000 | 0 | 6.26% | 0.00% |
| Oct. 16, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | M | Non-Qualified Stock Option (right to buy) | 200 | $0.00 | 152,942.0000 | 0 | 0.13% | 0.00% |
| Sept. 26, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | M | Common Stock | 17207 | $6.11 | 564,550.0000 | 0 | 3.14% | 0.00% |
| Sept. 29, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | M | Non-Qualified Stock Option (right to buy) | 7793 | $0.00 | 178,142.0000 | 0 | 4.19% | 0.00% |
| Sept. 26, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | M | Non-Qualified Stock Option (right to buy) | 17207 | $0.00 | 185,935.0000 | 0 | 8.47% | 0.00% |
| Sept. 29, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | S | Common Stock | 7793 | $29.70 | 547,343.0000 | 0 | 1.40% | 0.00% |
| Sept. 29, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | M | Common Stock | 7793 | $6.11 | 555,136.0000 | 0 | 1.42% | 0.00% |
| Sept. 26, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | S | Common Stock | 17207 | $28.85 | 547,343.0000 | 0 | 3.05% | 0.00% |
| Aug. 26, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | M | Common Stock | 17574 | $6.11 | 564,917.0000 | 0 | 3.21% | 0.00% |
| Aug. 27, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | M | Non-Qualified Stock Option (right to buy) | 7426 | $0.00 | 203,142.0000 | 0 | 3.53% | 0.00% |
| Aug. 26, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | M | Non-Qualified Stock Option (right to buy) | 17574 | $0.00 | 210,568.0000 | 0 | 7.70% | 0.00% |
| Aug. 27, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | S | Common Stock | 7426 | $25.01 | 547,343.0000 | 0 | 1.34% | 0.00% |
| Aug. 27, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | M | Common Stock | 7426 | $6.11 | 554,769.0000 | 0 | 1.36% | 0.00% |
| Aug. 26, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | S | Common Stock | 17574 | $24.96 | 547,343.0000 | 0 | 3.11% | 0.00% |
| Aug. 20, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | S | Common Stock | 25000 | $22.75 | 547,343.0000 | 0 | 4.37% | 0.00% |
| Aug. 20, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | M | Non-Qualified Stock Option (right to buy) | 25000 | $0.00 | 228,142.0000 | 0 | 9.88% | 0.00% |
| Aug. 20, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | M | Common Stock | 25000 | $6.11 | 572,343.0000 | 0 | 4.57% | 0.00% |
| Feb. 6, 2025 | Sionna Therapeutics, Inc. | $SION | Cloonan Michael | President & CEO | A | Stock Option (Right to Buy) | 450252 | $0.00 | 450,252.0000 | 0 | 9999.99% | 0.00% |