| Filed | Form | Filer | Stake | Shares | Intent | |
|---|---|---|---|---|---|---|
| 2019-09-24 | SC | Raging Capital Management, LLC | — | — | view → | |
| 2019-08-14 | SC | Merck KGaA | — | — | view → | |
| 2019-05-07 | SC | Raging Capital Management, LLC | — | — | view → | |
| 2019-04-02 | SC | Raging Capital Management, LLC | — | — | view → |
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