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SIONNA THERAPEUTICS INC (SION) Stock Ownership and Short Interest

USA - Nasdaq - NASDAQ:SION - US8294011080 - Common Stock

41.14 USD
-0.25 (-0.6%)
Last: 12/31/2025, 8:00:02 PM
41.14 USD
0 (0%)
After Hours: 12/31/2025, 8:00:02 PM
SION Ownership Chart.SION Ownership Chart: showing Insider, Institutional ownership and shares available to the public.SION Ownership.InsiderInstitutionalPublic



Shares Outstanding44.63M
Float29.91M
Float Short Interest Percentage9.62%
Owners (insider)1.38%
Owners (institutional)67.38%
Owners (insider) change-2.43%
Owners (institutional) change-1.32%
SION Institutional Ownership HistorySION Institutional Ownership HistorySION Institutional Ownership History Mar 2025 Jun 2025 Sep 2025 10M 20M 30M 40M
SION Historical Insider Transactions ChartSION Historical Insider Buy and Sell Transactions ChartSION Historical Insider Transactions Feb 2025 Mar 2025 Apr 2025 May 2025 Jun 2025 Jul 2025 Aug 2025 Sep 2025 Oct 2025 Nov 2025 Dec 2025 Jan 2026 0 20M 40M 60M 80M 100M
Date Name Type Shares Price Amount
Dec 24, 2025 ORBIMED ADVISORS LLC Open Market Sale 33356 44.55 $ 1,486,009.80
Dec 24, 2025 OrbiMed Capital GP VIII LLC Open Market Sale 33356 44.55 $ 1,486,009.80
Dec 24, 2025 Thompson Peter A. Open Market Sale 33356 44.55 $ 1,486,009.80
Dec 17, 2025 ORBIMED ADVISORS LLC Open Market Sale 1875 44.49 $ 83,427.75
Dec 17, 2025 OrbiMed Capital GP VIII LLC Open Market Sale 1875 44.49 $ 83,427.75
Dec 17, 2025 Thompson Peter A. Open Market Sale 1875 44.49 $ 83,427.75
Dec 5, 2025 Fitzpatrick Jennifer Option Excercise 10250 6.11 $ 62,627.50
Dec 5, 2025 Fitzpatrick Jennifer Open Market Sale 10250 40.52 $ 415,330.00
Nov 20, 2025 RA CAPITAL MANAGEMENT, LLC Open Market Sale 30316 39.61 $ 1,200,703.87
Nov 20, 2025 RA Capital Healthcare Fund LP Open Market Sale 30316 39.61 $ 1,200,703.87
Nov 20, 2025 RA Capital Nexus Fund, L.P. Open Market Sale 30316 39.61 $ 1,200,703.87
Nov 20, 2025 RA Capital Nexus Fund III, L.P. Open Market Sale 30316 39.61 $ 1,200,703.87
Nov 20, 2025 Kolchinsky Peter Open Market Sale 30316 39.61 $ 1,200,703.87
Nov 20, 2025 Shah Rajeev M. Open Market Sale 30316 39.61 $ 1,200,703.87
Nov 17, 2025 RA CAPITAL MANAGEMENT, LLC Open Market Sale 136351 40.34 $ 5,500,158.01
Nov 17, 2025 RA Capital Healthcare Fund LP Open Market Sale 136351 40.34 $ 5,500,158.01
Nov 17, 2025 RA Capital Nexus Fund, L.P. Open Market Sale 136351 40.34 $ 5,500,158.01
Nov 17, 2025 RA Capital Nexus Fund III, L.P. Open Market Sale 136351 40.34 $ 5,500,158.01
Nov 17, 2025 Kolchinsky Peter Open Market Sale 136351 40.34 $ 5,500,158.01
Nov 17, 2025 Shah Rajeev M. Open Market Sale 136351 40.34 $ 5,500,158.01
Oct 24, 2025 RA CAPITAL MANAGEMENT, LLC Open Market Sale 373610 39.51 $ 14,762,603.80
Oct 24, 2025 RA Capital Healthcare Fund LP Open Market Sale 373610 39.51 $ 14,762,603.80
Oct 24, 2025 RA Capital Nexus Fund, L.P. Open Market Sale 373610 39.51 $ 14,762,603.80
Oct 24, 2025 RA Capital Nexus Fund III, L.P. Open Market Sale 373610 39.51 $ 14,762,603.80
Oct 24, 2025 Kolchinsky Peter Open Market Sale 373610 39.51 $ 14,762,603.80
Oct 24, 2025 Shah Rajeev M. Open Market Sale 373610 39.51 $ 14,762,603.80
Oct 21, 2025 Booth Bruce Open Market Sale 88878 34.22 $ 3,041,683.18
Oct 21, 2025 Cloonan Michael Option Excercise 99800 6.11 $ 609,778.00
Oct 21, 2025 Cloonan Michael Open Market Sale 99800 36.26 $ 3,618,560.35
Oct 16, 2025 Booth Bruce Open Market Sale 286369 32.30 $ 9,251,102.06
Oct 15, 2025 Cloonan Michael Option Excercise 25200 6.11 $ 153,972.00
Oct 15, 2025 Cloonan Michael Open Market Sale 25200 31.28 $ 788,152.84
Oct 10, 2025 Booth Bruce Open Market Sale 194932 30.47 $ 5,939,783.84
Oct 3, 2025 Booth Bruce Open Market Sale 49546 29.99 $ 1,485,790.00
Sep 29, 2025 Booth Bruce Open Market Sale 78693 30.08 $ 2,367,472.73
Sep 26, 2025 Cloonan Michael Option Excercise 25000 6.11 $ 152,750.00
Sep 26, 2025 Cloonan Michael Open Market Sale 25000 29.11 $ 727,797.56
Sep 4, 2025 Fitzpatrick Jennifer Option Excercise 10250 6.11 $ 62,627.50
Sep 4, 2025 Fitzpatrick Jennifer Open Market Sale 10250 23.12 $ 236,980.00
Aug 29, 2025 Ridloff Elena Open Market Sale 9584 25.09 $ 240,441.52
Aug 26, 2025 Cloonan Michael Option Excercise 25000 6.11 $ 152,750.00
Aug 26, 2025 Cloonan Michael Open Market Sale 25000 24.97 $ 624,360.90
Aug 26, 2025 Ridloff Elena Open Market Sale 23416 25.70 $ 601,857.86
Aug 20, 2025 Cloonan Michael Option Excercise 25000 6.11 $ 152,750.00
Aug 20, 2025 Cloonan Michael Open Market Sale 25000 22.75 $ 568,750.00
Aug 19, 2025 Ridloff Elena Open Market Sale 52000 21.62 $ 1,124,335.00
Jun 27, 2025 TPG GP A, LLC Open Market Purchase 60000 15.84 $ 950,400.00
Jun 27, 2025 COULTER JAMES G Open Market Purchase 60000 15.84 $ 950,400.00
Jun 27, 2025 WINKELRIED JON Open Market Purchase 60000 15.84 $ 950,400.00
Feb 10, 2025 Shah Rajeev M. Other Aquisition 7951493 $ 0.00
Feb 10, 2025 RA CAPITAL MANAGEMENT, LLC Open Market Purchase 1125000 18.00 $ 20,250,000.00
Feb 10, 2025 RA Capital Healthcare Fund LP Open Market Purchase 1125000 18.00 $ 20,250,000.00
Feb 10, 2025 RA Capital Nexus Fund, L.P. Open Market Purchase 1125000 18.00 $ 20,250,000.00
Feb 10, 2025 RA Capital Nexus Fund III, L.P. Open Market Purchase 1125000 18.00 $ 20,250,000.00
Feb 10, 2025 Kolchinsky Peter Open Market Purchase 1125000 18.00 $ 20,250,000.00
Feb 10, 2025 Shah Rajeev M. Open Market Purchase 1125000 18.00 $ 20,250,000.00
Feb 10, 2025 TPG GP A, LLC Other Aquisition 4875547 $ 0.00
Feb 10, 2025 COULTER JAMES G Other Aquisition 4875547 $ 0.00
Feb 10, 2025 WINKELRIED JON Other Aquisition 4875547 $ 0.00
Feb 10, 2025 TPG GP A, LLC Open Market Purchase 1125000 18.00 $ 20,250,000.00
Feb 10, 2025 COULTER JAMES G Open Market Purchase 1125000 18.00 $ 20,250,000.00
Feb 10, 2025 Thompson Peter A. Other Aquisition 3154959 $ 0.00
Feb 10, 2025 WINKELRIED JON Open Market Purchase 1125000 18.00 $ 20,250,000.00
Feb 10, 2025 Thompson Peter A. Open Market Purchase 550000 18.00 $ 9,900,000.00
Feb 10, 2025 Booth Bruce Other Aquisition 3634020 $ 0.00
Feb 10, 2025 Booth Bruce Open Market Purchase 60000 18.00 $ 1,080,000.00
Feb 10, 2025 Atlas Venture Fund XI, L.P. Other Aquisition 3634020 $ 0.00
Feb 10, 2025 Atlas Venture Associates XI, L.P. Other Aquisition 3634020 $ 0.00
Feb 10, 2025 Atlas Venture Associates XI, LLC Other Aquisition 3634020 $ 0.00
Feb 10, 2025 Atlas Venture Opportunity Fund II, L.P. Other Aquisition 3634020 $ 0.00
Feb 10, 2025 Atlas Venture Associates Opportunity II, LP Other Aquisition 3634020 $ 0.00
Feb 10, 2025 Atlas Venture Associates Opportunity II, LLC Other Aquisition 3634020 $ 0.00
Feb 10, 2025 Atlas Venture Fund XI, L.P. Open Market Purchase 60000 18.00 $ 1,080,000.00
Feb 10, 2025 Atlas Venture Associates XI, L.P. Open Market Purchase 60000 18.00 $ 1,080,000.00
Feb 10, 2025 Atlas Venture Associates XI, LLC Open Market Purchase 60000 18.00 $ 1,080,000.00
Feb 10, 2025 Atlas Venture Opportunity Fund II, L.P. Open Market Purchase 60000 18.00 $ 1,080,000.00
Feb 10, 2025 Atlas Venture Associates Opportunity II, LP Open Market Purchase 60000 18.00 $ 1,080,000.00
Feb 10, 2025 Atlas Venture Associates Opportunity II, LLC Open Market Purchase 60000 18.00 $ 1,080,000.00
Feb 10, 2025 RA CAPITAL MANAGEMENT, LLC Other Aquisition 7951493 $ 0.00
Feb 10, 2025 RA Capital Healthcare Fund LP Other Aquisition 7951493 $ 0.00
Feb 10, 2025 RA Capital Nexus Fund, L.P. Other Aquisition 7951493 $ 0.00
Feb 10, 2025 RA Capital Nexus Fund III, L.P. Other Aquisition 7951493 $ 0.00
Feb 10, 2025 Kolchinsky Peter Other Aquisition 7951493 $ 0.00