Quick Takeaways
- William D. Clark has 3 issuer positions tracked on this page.
- Estimated disclosed ownership value: $385,470.
- Recent insider filing activity is available below.
Insider Trading & Ownership of William D. Clark
- Location
- Cambridge, MA
- Summary
- The estimated net worth of William D. Clark is at least $385,470 dollars as of 24 Nov 2025. William D. Clark is the President and CEO, Director of GENOCEA BIOSCIENCES, INC. and owns shares of GENOCEA BIOSCIENCES, INC. stock worth about $380.5K. William D. Clark is the Director of iBio, Inc. and owns shares of iBio, Inc. (IBIO) stock worth about $5K.
- Signature
- /s/ Marc Banjak, Attorney-in-fact
- All Insider Reports
- All Insider Reports
Follow Filing Activity
Follow William D. Clark and return when a new Insider Trading filing changes the record on this page.
This uses the existing product follow flow to surface future filing-backed changes without guessing what they mean.
What Changed
- Largest disclosed position: GENOCEA BIOSCIENCES, INC. ($380,471).
- Past-year value change for that position: .
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.
Source Evidence
Filed on Form 4
See Original Filing
Insider ownership context is sourced from SEC Forms 3, 4, and 5.
Ownership of William D. Clark
| Symbol | Company | Relationship | Holdings Value | Past Year Net Change | Change % | Report Period |
|---|---|---|---|---|---|---|
| GNCA | GENOCEA BIOSCIENCES, INC. | President and CEO, Director | $380,471 | 02 Jun 2022 | ||
| IBIO | iBio, Inc. | Director | $4,999 | 20 Nov 2025 | ||
| ALDX | Aldeyra Therapeutics, Inc. | Director | 17 Apr 2025 |
Insider Transactions Reported by William D. Clark:
| 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.