Insiders / Keson-Brookes Maiken
Keson-Brookes Maiken
CIK 1693805personinsider
Companies
2
First seen
Feb 2, 2021
Last activity
Dec 5, 2025
Companies
| Company | Shares held | Latest |
|---|---|---|
| Rubius Therapeutics, Inc. · RUBY | 5,343 | — |
| Mural Oncology plc · MURA | 0 | — |
All securities held
3 positions · latest reported per filing
Shares
| Company | Security | Shares |
|---|---|---|
| Rubius Therapeutics, Inc. | Common stock | 5,343 |
Awards
| Company | Security | Shares |
|---|---|---|
| Rubius Therapeutics, Inc. | Restricted units | 34,500 |
Derivatives
| Company | Security | Shares |
|---|---|---|
| Rubius Therapeutics, Inc. | Options | 143,750 |
Ownership percentages elsewhere on the site count common and ordinary shares only, because that is what shares outstanding are measured in. Everything above is a real holding; not all of it is a share of the company.
Activity
InsidersInstitutions
This person's trades in company stock, across every company.| Date | Action | Company | Value | Shares Δ | Position after | Impact |
|---|---|---|---|---|---|---|
| Mar 15, 2021 | Sell Open-market sale | RUBY Rubius Therapeutics, Inc. Common Stock | $506.0K | -25K -100.00% | 0 | medium |
| Mar 15, 2021 | Exercise Option exercise | RUBY Rubius Therapeutics, Inc. Common Stock | $192.5K | +25K | 25,000 | low |
| Feb 1, 2022 | Sell Open-market sale | RUBY Rubius Therapeutics, Inc. Common Stock | $18.0K | -3K -33.83% |