| Filed | Form | Filer | Stake | Shares | |
|---|---|---|---|---|---|
| 2022-11-14 | SC | GAMCO INVESTORS, INC. ET AL | — | — | view → |
| 2020-08-27 | SC | GAMCO INVESTORS, INC. ET AL | — | — | view → |
| 2019-12-19 | SC | Pistor Walter Brown | — | — | view → |
| Filed | Form | Issuer | Stake | Shares | |
|---|---|---|---|---|---|
| 2022-08-22 | SC | Rubicon Technology, Inc. | — | — | view → |
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