SION
SIONNA THER (SION)
NASDAQ
$7.85-$0.005 (-0.06%)
Price as of Sep 11, 2026 7:59 PM EDT
  • $354.9M
    Market Cap
  • -65.62%
    1-Year Change
  • Biotechnology
    Industry

Top Holders

Institutional
Mutual Funds
Holder
Ownership %
Shares Held
Change (Shares, %)
Report Date
RA CAPITAL MANAGEMENT, L.P.
21.94%
9.9M
0 (0.00%)
Jun 30, 2026
TPG GP A, LLC
14.39%
6.5M
0 (0.00%)
Jun 30, 2026
VIKING GLOBAL INVESTORS LP
7.08%
3.2M
0 (0.00%)
Jun 30, 2026
ATLAS VENTURE LIFE SCIENCE ADVISORS, LLC
6.63%
3.0M
0 (0.00%)
Jun 30, 2026
ORBIMED ADVISORS LLC
5.66%
2.6M
-974,825 (-38.14%)
Jun 30, 2026
ENAVATE SCIENCES GP, LLC
5.49%
2.5M
0 (0.00%)
Jun 30, 2026
ADAGE CAPITAL PARTNERS GP, L.L.C.
3.54%
1.6M
+1.4M (+90.63%)
Jun 30, 2026

Current Ownership Distribution

  • Institutions262.3M (84.11%)
  • Mutual Funds37.1M (11.89%)
  • Insiders12.5M (4.00%)
  • Other0 (0.00%)

Insider Transactions

  • 4.00% (12.5M)
    Current InsiderOwnership (%, shares)
  • 0
    Number of InsiderBuying (last 12 months)
  • $0.00
    Amount of InsiderBuying (last 12 months)
  • 7
    Number of InsiderSelling (last 12 months)
  • $7.0B
    Amount of InsiderSelling (last 12 months)
Insider Name & Title
Type
Date
Transaction Value
Shares
Share Price
Shares After Transactions
ORBIMED ADVISORS LLC
Sell
Jul 07, 2026
$3.9M
85,918
$44.86
2.5M
Fitzpatrick Jennifer
Chief Legal Officer
Exempt
Jul 06, 2026
$0.00
10,250
$0.00
40,685
Fitzpatrick Jennifer
Chief Legal Officer
Exempt
Jul 06, 2026
$62,627.50
10,250
$6.11
10,250
Fitzpatrick Jennifer
Chief Legal Officer
Sell
Jul 06, 2026
$446,862.08
10,250
$43.60
0
ORBIMED ADVISORS LLC
Sell
Jun 30, 2026
$5.3M
115,844
$45.50
2.6M
Thompson Peter A.
Award
Jun 17, 2026
$0.00
17,340
$0.00
17,340
Fleming Harold Edward
Award
Jun 17, 2026
$0.00
17,340
$0.00
17,340
Stelzer Laurie
Award
Jun 17, 2026
$0.00
17,340
$0.00
17,340
Resnick Joshua
Award
Jun 17, 2026
$0.00
17,340
$0.00
17,340
Ruddy Marcella K.
Award
Jun 17, 2026
$0.00
17,340
$0.00
17,340
Fitzpatrick Jennifer
Chief Legal Officer
Exempt
Mar 05, 2026
$0.00
10,250
$0.00
50,935
Fitzpatrick Jennifer
Chief Legal Officer
Exempt
Mar 05, 2026
$62,627.50
10,250
$6.11
10,250
Fitzpatrick Jennifer
Chief Legal Officer
Sell
Mar 05, 2026
$347,018.88
10,250
$33.86
0
TPG GP A, LLC
Sell
Jan 22, 2026
$10.0M
250,000
$40.00
6.5M
Beer Caroline Stark
Chief Business Officer
Award
Jan 02, 2026
$0.00
139,340
$0.00
139,340
Fitzpatrick Jennifer
Chief Legal Officer
Award
Jan 02, 2026
$0.00
103,140
$0.00
103,140
Thompson Peter A.
Sell
Dec 24, 2025
$1.5M
33,356
$44.55
3.6M
Thompson Peter A.
Sell
Dec 19, 2025
$38,928.75
875
$44.49
3.6M
Thompson Peter A.
Sell
Dec 18, 2025
$4,449.00
100
$44.49
3.6M
Thompson Peter A.
Sell
Dec 17, 2025
$40,050.00
900
$44.50
3.6M
ORBIMED ADVISORS LLC
Sell
Nov 26, 2025
$71,184.00
1,600
$44.49
3.6M
ORBIMED ADVISORS LLC
Sell
Nov 25, 2025
$530,294.00
11,890
$44.60
3.6M
ORBIMED ADVISORS LLC
Sell
Nov 24, 2025
$4.2M
94,583
$44.54
3.6M
RA CAPITAL MANAGEMENT, LLC
Sell
Nov 21, 2025
$47,795.00
1,210
$39.50
6.9M
RA CAPITAL MANAGEMENT, LLC
Sell
Nov 21, 2025
$391,998.00
9,924
$39.50
650,307
RA CAPITAL MANAGEMENT, LLC
Sell
Nov 21, 2025
$254,380.00
6,440
$39.50
2.2M
RA CAPITAL MANAGEMENT, LLC
Sell
Nov 21, 2025
$300,555.50
7,609
$39.50
159,033
RA CAPITAL MANAGEMENT, LLC
Sell
Nov 20, 2025
$5,983.50
150
$39.89
6.9M
RA CAPITAL MANAGEMENT, LLC
Sell
Nov 20, 2025
$49,264.15
1,235
$39.89
661,019
RA CAPITAL MANAGEMENT, LLC
Sell
Nov 20, 2025
$31,951.89
801
$39.89
2.2M