CHARLES SCHWAB INVESTMENT MANAGEMENT INC
Position in ZBIO — Zenas BioPharma, Inc.
CIK 884546
SAN FRANCISCO, CA
Position in ZBIO
as of Mar 31, 2026
· filed May 15, 2026
Position Value
$4,387,059
-$3,353,978 QoQ
Shares Held
224,402
+5.3% QoQ
Ownership
0.355%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Dec 2024
6 quarters on record
Voting authority
Sole 100.ToString("F0")%
Shared 0.ToString("F0")%
None 0.ToString("F0")%
Common Shares in ZBIO Over Time
Shares Held
Position Value (USD)
Position in Biotechnology
Healthcare · as of Mar 31, 2026CHARLES SCHWAB INVESTMENT MANAGEMENT INC holds $6,182,986,350 across 288 Biotechnology names. ZBIO ranks #139 (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 ZBIO
Export CSV
6 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $4,387,059 | 224,402 | Shares | Sole | 2026-05-15 | |
| 2025-12-31 | $7,741,037 | 213,193 | Shares | Sole | 2026-02-13 | |
| 2025-09-30 | $3,960,391 | 178,396 | Shares | Sole | 2025-11-10 | |
| 2025-06-30 | $1,184,214 | 122,210 | Shares | Sole | 2025-08-12 | |
| 2025-03-31 | $917,506 | 116,140 | Shares | Sole | 2025-09-15 | |
| 2024-12-31 | $971,825 | 118,660 | Shares | Sole | 2025-02-06 | |
| No filing history on record for this holder in this stock. | ||||||