CHARLES SCHWAB INVESTMENT MANAGEMENT INC
Position in CSTL — Castle Biosciences Inc
CIK 884546
SAN FRANCISCO, CA
Position in CSTL
as of Mar 31, 2026
· filed May 15, 2026
Position Value
$5,938,154
-$3,496,457 QoQ
Shares Held
241,880
-0.3% QoQ
Ownership
0.797%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Mar 2020
25 quarters on record
Voting authority
Sole 100%
Shared 0%
None 0%
Common Shares in CSTL Over Time
Shares Held
Position Value (USD)
Position in Diagnostics & Research
Healthcare · as of Mar 31, 2026CHARLES SCHWAB INVESTMENT MANAGEMENT INC holds $4,743,797,769 across 32 Diagnostics & Research names. CSTL ranks #26 (0.1% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | TMO |
Thermo Fisher Scientific Inc.
|
2,934,842 | $1,442,562,888 | |
| 2 | DHR |
Danaher Corp /De/
|
4,734,898 | $897,736,660 | |
| 3 | IDXX |
Idexx Laboratories Inc /De
|
610,217 | $342,874,830 | |
| 4 | IQV |
Iqvia Holdings Inc.
|
1,412,147 | $240,827,549 | |
| 5 | WAT |
Waters Corp /De/
|
772,524 | $230,057,646 | |
| 6 | A |
Agilent Technologies, Inc.
|
1,904,308 | $217,053,025 | |
| 7 | MTD |
Mettler Toledo International Inc/
|
161,665 | $203,891,898 | |
| 8 | LH |
Labcorp Holdings Inc.
|
646,135 | $172,395,279 |
All Filings in CSTL
Export CSV
25 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $5,938,154 | 241,880 | Shares | Sole | 2026-05-15 | |
| 2025-12-31 | $9,434,611 | 242,535 | Shares | Sole | 2026-02-13 | |
| 2025-09-30 | $5,422,766 | 238,154 | Shares | Sole | 2025-11-10 | |
| 2025-06-30 | $4,799,006 | 235,015 | Shares | Sole | 2025-08-12 | |
| 2025-03-31 | $4,850,005 | 242,258 | Shares | Sole | 2025-09-15 | |
| 2024-12-31 | $6,898,778 | 258,866 | Shares | Sole | 2025-02-06 | |
| 2024-09-30 | $7,836,183 | 274,761 | Shares | Sole | 2024-11-12 | |
| 2024-06-30 | $5,123,438 | 235,344 | Shares | Sole | 2024-08-12 | |
| 2024-03-31 | $4,539,354 | 204,937 | Shares | Sole | 2024-05-09 | |
| 2023-12-31 | $4,473,426 | 207,295 | Shares | Sole | 2024-02-06 | |
| 2023-09-30 | $3,394,704 | 200,989 | Shares | Sole | 2023-11-08 | |
| 2023-06-30 | $2,551,851 | 185,995 | Shares | Sole | 2023-08-10 | |
| 2023-03-31 | $4,172,891 | 183,666 | Shares | Sole | 2023-05-12 | |
| 2022-12-31 | $4,343,977 | 184,536 | Shares | Sole | 2023-02-13 | |
| 2022-09-30 | $4,632,486 | 177,626 | Shares | Sole | 2022-11-14 | |
| 2022-06-30 | $3,754,349 | 171,041 | Shares | Sole | 2022-08-15 | |
| 2022-03-31 | $7,451,829 | 166,113 | Shares | Sole | 2022-05-13 | |
| 2021-12-31 | $6,941,296 | 161,915 | Shares | Sole | 2022-02-11 | |
| 2021-09-30 | $10,535,129 | 158,423 | Shares | Sole | 2021-11-16 | |
| 2021-06-30 | $9,771,442 | 133,253 | Shares | Sole | 2021-08-16 | |
| 2021-03-31 | $7,985,653 | 116,647 | Shares | Sole | 2021-05-17 | |
| 2020-12-31 | $7,054,241 | 105,052 | Shares | Sole | 2021-02-16 | |
| 2020-09-30 | $4,400,312 | 85,526 | Shares | Sole | 2020-11-13 | |
| 2020-06-30 | $875,237 | 23,222 | Shares | Sole | 2020-08-20 | |
| 2020-03-31 | $673,765 | 22,602 | Shares | Sole | 2020-05-15 | |
| No filing history on record for this holder in this stock. | ||||||