CHARLES SCHWAB INVESTMENT MANAGEMENT INC
Position in SION — Sionna Therapeutics, Inc.
CIK 884546
SAN FRANCISCO, CA
Position in SION
as of Mar 31, 2026
· filed May 15, 2026
Position Value
$4,820,942
-$267,500 QoQ
Shares Held
120,253
-2.8% QoQ
Ownership
0.266%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Mar 2025
5 quarters on record
Voting authority
Sole 100%
Shared 0%
None 0%
Common Shares in SION Over Time
Shares Held
Position Value (USD)
Position in Biotechnology
Healthcare · as of Mar 31, 2026CHARLES SCHWAB INVESTMENT MANAGEMENT INC holds $6,185,699,337 across 288 Biotechnology names. SION ranks #133 (0.1% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | VRTX |
Vertex Pharmaceuticals Inc / Ma
|
1,920,871 | $857,745,736 | |
| 2 | REGN |
Regeneron Pharmaceuticals, Inc.
|
804,508 | $621,595,061 | |
| 3 | MRNA |
Moderna, Inc.
|
4,734,356 | $240,505,284 | |
| 4 | ALNY |
Alnylam Pharmaceuticals, Inc.
|
673,356 | $222,793,299 | |
| 5 | INSM |
INSMED Inc
|
1,069,390 | $174,866,652 | |
| 6 | RVMD |
Revolution Medicines, Inc.
|
1,735,476 | $168,775,041 | |
| 7 | INCY |
Incyte Corp
|
1,729,102 | $162,743,080 | |
| 8 | BBIO |
BridgeBio Pharma, Inc.
|
1,976,094 | $146,744,740 |
All Filings in SION
Export CSV
5 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $4,820,942 | 120,253 | Shares | Sole | 2026-05-15 | |
| 2025-12-31 | $5,088,442 | 123,686 | Shares | Sole | 2026-02-13 | |
| 2025-09-30 | $3,279,097 | 111,496 | Shares | Sole | 2025-11-10 | |
| 2025-06-30 | $1,610,635 | 92,832 | Shares | Sole | 2025-08-12 | |
| 2025-03-31 | $676,176 | 64,644 | Shares | Sole | 2025-09-15 | |
| No filing history on record for this holder in this stock. | ||||||