Quick Takeaways
- Mark Simon has 1 issuer position tracked on this page.
- Estimated disclosed ownership value: $351,516.
- Recent insider filing activity is available below.
- Info
- Insider Ownership
Insider Trading & Ownership of Mark Simon
- Location
- Cranbury, NJ
- Summary
- The estimated net worth of Mark Simon is at least $351,516 dollars as of 21 Jan 2026. Mark Simon is the Director of Cabaletta Bio, Inc. and owns shares of Cabaletta Bio, Inc. (CABA) stock worth about $351.5K.
- Signature
- By: /s/ Michael Gerard, as Attorney-in-Fact
- All Insider Reports
- All Insider Reports
Follow Filing Activity
Follow Mark Simon 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: Cabaletta Bio, Inc. ($351,516).
- Past-year value change for that position: +$25,261.
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 Mark Simon
| Symbol | Company | Relationship | Holdings Value | Past Year Net Change | Change % | Report Period |
|---|---|---|---|---|---|---|
| CABA | Cabaletta Bio, Inc. | Director | $351,516 | +$25,261 | +7.7% | 21 Jan 2026 |
Insider Transactions Reported by Mark Simon:
| 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.