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SIONNA THER (SION)
NASDAQ
$4.94-$0.16 (-3.16%)
Price as of Oct 02, 2026 5:55 PM EDT- $230.6MMarket Cap
- -82.59%1-Year Change
- BiotechnologyIndustry
SIONNA THER (SION)
$4.94-$0.16 (-3.16%)
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 |
Holder | Ownership %
| Shares Held | Change (Shares, %) | Report Date |
|---|---|---|---|---|
VANGUARD INDEX FUNDS | 2.44% | 1.1M | +100,564 (+9.12%) | Jun 30, 2026 |
PRUDENTIAL SECTOR FUNDS, INC. | 1.44% | 651,048 | 0 (0.00%) | May 29, 2026 |
SPDR SERIES TRUST | 1.43% | 647,694 | 0 (0.00%) | Jul 31, 2026 |
JPMORGAN TRUST II | 1.16% | 524,280 | -27,549 (-5.25%) | Jun 30, 2026 |
MUTUAL FUND SERIES TRUST | 1.06% | 479,832 | -169,510 (-35.33%) | Jun 30, 2026 |
T. Rowe Price Health Sciences Fund, Inc. | 0.64% | 287,643 | -259,800 (-90.32%) | Jun 30, 2026 |
FIDELITY SALEM STREET TRUST | 0.45% | 204,356 | +187,078 (+91.55%) | Jul 31, 2026 |
Current Ownership Distribution
- Institutions262.3M (82.75%)
- Mutual Funds38.6M (12.19%)
- Insiders16.0M (5.06%)
- Other0 (0.00%)
Insider Transactions
- 5.06% (16.0M)Current InsiderOwnership (%, shares)
- 0Number of InsiderBuying (last 12 months)
- $0.00Amount of InsiderBuying (last 12 months)
- 7Number of InsiderSelling (last 12 months)
- $6.7BAmount of InsiderSelling (last 12 months)
Insider Name & Title | Type | Date
| Transaction Value | Shares | Share Price | Shares After Transactions |
|---|---|---|---|---|---|---|
McKee Charlotte CMO and Head of R&D | Award | Sep 17, 2026 | $0.00 | 155,700 | $0.00 | 155,700 |
Cloonan Michael President & CEO | Award | Sep 17, 2026 | $0.00 | 436,100 | $0.00 | 436,100 |
McKee Charlotte CMO and Head of R&D | Return | Sep 17, 2026 | $0.00 | 155,700 | $0.00 | 0 |
RA CAPITAL MANAGEMENT, LLC | Sell | Sep 17, 2026 | $21.6M | 3.4M | $6.32 | 3.5M |
McKee Charlotte CMO and Head of R&D | Award | Sep 17, 2026 | $0.00 | 50,000 | $0.00 | 78,415 |
Cloonan Michael President & CEO | Return | Sep 17, 2026 | $0.00 | 436,100 | $0.00 | 0 |
McKee Charlotte CMO and Head of R&D | Award | Sep 17, 2026 | $0.00 | 50,000 | $0.00 | 128,415 |
RA CAPITAL MANAGEMENT, LLC | Sell | Sep 17, 2026 | $252,148.00 | 33,800 | $7.46 | 3.4M |
Cloonan Michael President & CEO | Award | Sep 17, 2026 | $0.00 | 109,025 | $0.00 | 656,368 |
Cloonan Michael President & CEO | Award | Sep 17, 2026 | $0.00 | 109,025 | $0.00 | 765,393 |
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 |
Ruddy Marcella K. | 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 |
Stelzer Laurie | 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 |