Prothena shares owned by Charles Schwab Investment Management
Quarter-by-quarter ownership of Prothena (PRTA) shares owned by Charles Schwab Investment Management
from 13F filings
Historical chart of Charles Schwab Investment Management investment in Prothena
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Quarterly reported holdings in Prothena by Charles Schwab Investment Management
| Quarter filed | Position value | Share count | Share price at filing |
|---|---|---|---|
| 2025-09-30 | $3.4M | 351k | 9.76 |
| 2025-06-30 | $1.7M | 275k | 6.07 |
| 2025-03-31 | $4.0M | 320k | 12.38 |
| 2024-12-31 | $4.5M | 327k | 13.85 |
| 2024-09-30 | $5.4M | 325k | 16.73 |
| 2024-06-30 | $6.8M | 327k | 20.64 |
| 2024-03-31 | $7.9M | 319k | 24.77 |
| 2023-12-31 | $11M | 313k | 36.34 |
| 2023-09-30 | $15M | 309k | 48.25 |
| 2023-06-30 | $21M | 313k | 68.28 |
| 2023-03-31 | $15M | 299k | 48.47 |
| 2022-12-31 | $18M | 301k | 60.25 |
| 2022-09-30 | $17M | 286k | 60.63 |
| 2022-06-30 | $7.5M | 278k | 27.15 |
| 2022-03-31 | $10M | 284k | 36.57 |
| 2021-12-31 | $13M | 256k | 49.40 |
| 2021-09-30 | $17M | 242k | 71.23 |
| 2021-06-30 | $11M | 207k | 51.41 |
| 2021-03-31 | $4.7M | 186k | 25.12 |
| 2020-12-31 | $2.2M | 183k | 12.01 |
| 2020-09-30 | $1.8M | 183k | 9.99 |
| 2020-06-30 | $2.5M | 238k | 10.46 |
| 2020-03-31 | $2.6M | 242k | 10.70 |
| 2019-12-31 | $3.8M | 239k | 15.83 |
| 2019-09-30 | $1.8M | 234k | 7.84 |
| 2019-06-30 | $2.5M | 234k | 10.57 |
| 2019-03-31 | $2.7M | 219k | 12.13 |
| 2018-12-31 | $2.3M | 220k | 10.30 |
| 2018-09-30 | $2.6M | 201k | 13.08 |
| 2018-06-30 | $3.0M | 205k | 14.58 |
| 2018-03-31 | $6.4M | 175k | 36.71 |
| 2017-12-31 | $6.8M | 182k | 37.49 |
| 2017-09-30 | $11M | 173k | 64.77 |
| 2017-06-30 | $8.9M | 164k | 54.12 |
| 2017-03-31 | $8.6M | 154k | 55.79 |
| 2016-12-31 | $6.7M | 137k | 49.19 |
| 2016-09-30 | $7.8M | 130k | 59.97 |
| 2016-06-30 | $3.9M | 112k | 34.97 |
| 2016-03-31 | $4.9M | 119k | 41.17 |
| 2015-12-31 | $7.3M | 108k | 68.11 |
| 2015-09-30 | $4.2M | 93k | 45.35 |
| 2015-06-30 | $2.9M | 55k | 52.67 |
| 2015-03-31 | $1.8M | 48k | 38.15 |
| 2014-12-31 | $1.0M | 48k | 20.76 |
| 2014-09-30 | $1.1M | 48k | 22.17 |
| 2014-06-30 | $724k | 32k | 22.55 |
| 2014-03-31 | $786k | 21k | 38.34 |
| 2013-12-31 | $544k | 21k | 26.54 |
| 2013-09-30 | $339k | 17k | 20.06 |
| 2013-06-30 | $220k | 17k | 13.02 |
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