Quick Takeaways
- Mr. Chirfi Guindo has 3 issuer positions tracked on this page.
- Estimated disclosed ownership value: $15,712,198.
- Recent insider filing activity is available below.
- Info
- Insider Ownership
Insider Trading & Ownership of Mr. Chirfi Guindo
- Location
- Cambridge, MA
- Summary
- The estimated net worth of Mr. Chirfi Guindo is at least $15,712,198 dollars as of 12 Feb 2026. Mr. Chirfi Guindo is the Chief Marketing Officer of Merck & Co., Inc. and owns shares of Merck & Co., Inc. (MRK) stock worth about $10.62M. Mr. Chirfi Guindo is the Head of Glob Prod Strat & Com of BIOGEN INC. and owns shares of BIOGEN INC. (BIIB) stock worth about $4.14M. Mr. Chirfi Guindo is the Director of Beam Therapeutics Inc. and owns shares of Beam Therapeutics Inc. (BEAM) stock worth about $953.7K.
- Signature
- /s/ Kelly Grez, as attorney-in-fact for Mr. Chirfi Guindo
- All Insider Reports
- All Insider Reports
Follow Filing Activity
Follow Mr. Chirfi Guindo and return when a new Insider Trading filing appears.
This tracks SEC filing changes for this page using existing product update flows.
What Changed
- Largest disclosed position: Merck & Co., Inc. ($10,618,772).
- Past-year value change for that position: -$4,836,339.
Why This Matters
- This page translates Forms 3/4/5 into a quick ownership context before you inspect each transaction row.
- You can cross-check role, issuer, and filing chronology directly against the SEC source.
Official SEC Source
Filed on Form 4
Insider ownership context is sourced from SEC Forms 3, 4, and 5.
See Original FilingOwnership of Mr. Chirfi Guindo
| Symbol | Company | Relationship | Holdings Value | Past Year Net Change | Change % | Report Period |
|---|---|---|---|---|---|---|
| MRK | Merck & Co., Inc. | Chief Marketing Officer | $10,618,772 | -$4,836,339 | -31% | 12 Feb 2026 |
| BIIB | BIOGEN INC. | Head of Glob Prod Strat & Com | $4,139,728 | 18 Feb 2022 | ||
| BEAM | Beam Therapeutics Inc. | Director | $953,698 | 04 Jun 2025 |
Insider Transactions Reported by Mr. Chirfi Guindo:
| Sym | Company | Class | Transaction | % | Value $ | * Price $ | Shares | Shares After | Date | Ownership |
|---|
* An asterisk sign (*) next to the price indicates that the price is likely invalid.