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Overview
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Business Summary
Filings
Ownership
Valuation
Ownership — SION
Institutional Holdings
Insider Transactions
US Institutional Ownership
100.0%
Institution
Shares
Value
Ownership %
Change
Filing Date
RA CAPITAL MANAGEMENT, L.P.
9.91M
$435.0M
21.93%
--
2026-06-30
TPG GP A, LLC
6.49M
$285.0M
14.38%
--
2026-06-30
VIKING GLOBAL INVESTORS LP
3.20M
$140.0M
7.07%
--
2026-06-30
Atlas Venture Life Science Advisors, LLC
3.00M
$131.0M
6.63%
--
2026-06-30
ORBIMED ADVISORS LLC
2.56M
$112.0M
5.66%
-974.8K
2026-06-30
ENAVATE SCIENCES GP, LLC
2.48M
$109.0M
5.49%
--
2026-06-30
ADAGE CAPITAL PARTNERS GP, L.L.C.
1.60M
$70.0M
3.54%
+1.45M
2026-06-30
JPMORGAN CHASE & CO
1.49M
$64.0M
3.30%
+258.7K
2026-06-30
BlackRock, Inc.
1.47M
$64.0M
3.27%
+178.9K
2026-06-30
JENNISON ASSOCIATES LLC
1.17M
$51.0M
2.60%
-279.1K
2026-06-30
CITADEL ADVISORS LLC
1.16M
$50.0M
2.56%
-10.9K
2026-06-30
VANGUARD CAPITAL MANAGEMENT LLC
1.13M
$49.0M
2.51%
+102.5K
2026-06-30
STATE STREET CORP
1.02M
$44.0M
2.26%
+265.3K
2026-06-30
PERCEPTIVE ADVISORS LLC
905.0K
$39.0M
2.00%
+246.6K
2026-06-30
DEERFIELD MANAGEMENT COMPANY, L.P.
680.9K
$29.0M
1.51%
-289.7K
2026-06-30
Siren, L.L.C.
610.5K
$26.0M
1.35%
+310.5K
2026-06-30
PRICE T ROWE ASSOCIATES INC /MD/
478.0K
$21.0M
1.06%
-278.4K
2026-06-30
EVENTIDE ASSET MANAGEMENT, LLC
475.0K
$20.0M
1.05%
-170.5K
2026-06-30
GEODE CAPITAL MANAGEMENT, LLC
457.1K
$20.0M
1.01%
+67.3K
2026-06-30
Casdin Capital, LLC
400.0K
$17.0M
0.89%
--
2026-06-30
BAKER BROS. ADVISORS LP
400.0K
$17.0M
0.89%
--
2026-06-30
GOLDMAN SACHS GROUP INC
388.8K
$17.0M
0.86%
+125.6K
2026-06-30
Driehaus Capital Management LLC
385.4K
$16.0M
0.85%
+308.8K
2026-06-30
MILLENNIUM MANAGEMENT LLC
325.3K
$14.0M
0.72%
+184.7K
2026-06-30
FRANKLIN RESOURCES INC
290.1K
$12.0M
0.64%
+114.6K
2026-06-30
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