Michael A. Bieber - SEC Form 4 Insider Trading Activity
Summary
Updated Aug 4, 2026
Michael A. Bieber has filed 2 SEC Form 4 filings across 1 company in the last 90 days - selling. Lifetime open-market sales: $7.90M.
Profile
Michael A. Bieber is a corporate insider at Willdan Group, Inc. (WLDN). Bieber has reported 13 insider filings with the SEC since 2024. The most recent filing was in May 2026.
| Role | PRESIDENT AND CEO |
|---|---|
| Notability | 20/100 |
Board memberships
- Willdan Group, Inc.
Awards & honors
- Leadership in energy consulting
- Expansion of Willdan's service offerings
- Strategic growth initiatives
Trading Pattern
InsiderAlpha's records for Michael A. Bieber go back to 2024: 13 primary Form 4 filings, an average of 4.3 per year. No transaction on record carries a Rule 10b5-1 flag - the filings look discretionary rather than pre-scheduled, which makes their timing more informative as a signal.
Career & Filing History
Every role Michael A. Bieber has reported on a Form 4, reconstructed from the filings themselves - reporting insiders must state their relationship to the issuer (officer title, director seat, or 10% ownership) on every filing.
- PRESIDENT AND CEO at Willdan Group, Inc. (WLDN) - 13 filings, 2024 to 2026
Recent Transactions
| Date | Ticker | Company | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-05-15 | WLDN | Willdan Group, Inc. | S - Open-market sale | 276 | $93.74 | $26K |
| 2026-05-15 | WLDN | Willdan Group, Inc. | S - Open-market sale | 8.0K | $92.65 | $737K |
| 2026-05-15 | WLDN | Willdan Group, Inc. | S - Open-market sale | 23.0K | $91.95 | $2.12M |
| 2026-05-15 | WLDN | Willdan Group, Inc. | S - Open-market sale | 25.4K | $90.88 | $2.31M |
| 2026-05-15 | WLDN | Willdan Group, Inc. | M - Option exercise | 16.7K | $28.19 | $470K |
| 2026-05-15 | WLDN | Willdan Group, Inc. | M - Option exercise | 40.0K | $16.27 | $651K |
| 2026-05-14 | WLDN | Willdan Group, Inc. | S - Open-market sale | 10.0K | $92.65 | $926K |
| 2026-05-14 | WLDN | Willdan Group, Inc. | M - Option exercise | 10.0K | $16.27 | $163K |
| 2026-03-26 | WLDN | Willdan Group, Inc. | F - Tax withholding / forfeiture | 6.4K | $82.80 | $534K |
| 2026-03-26 | WLDN | Willdan Group, Inc. | A - Grant or award | 15.8K | $0.00 | |
| 2026-03-23 | WLDN | Willdan Group, Inc. | F - Tax withholding / forfeiture | 2.4K | $75.52 | $180K |
| 2026-03-19 | WLDN | Willdan Group, Inc. | F - Tax withholding / forfeiture | 2.6K | $78.29 | $206K |
| 2026-03-17 | WLDN | Willdan Group, Inc. | F - Tax withholding / forfeiture | 7.1K | $78.61 | $557K |
| 2026-03-17 | WLDN | Willdan Group, Inc. | A - Grant or award | 17.3K | $0.00 | |
| 2026-03-12 | WLDN | Willdan Group, Inc. | F - Tax withholding / forfeiture | 7.7K | $83.98 | $646K |
| 2026-03-12 | WLDN | Willdan Group, Inc. | A - Grant or award | 18.8K | $0.00 | |
| 2026-03-11 | WLDN | Willdan Group, Inc. | F - Tax withholding / forfeiture | 1.8K | $82.98 | $151K |
| 2026-03-05 | WLDN | Willdan Group, Inc. | A - Grant or award | 18.0K | $0.00 | |
| 2025-08-18 | WLDN | Willdan Group, Inc. | F - Tax withholding / forfeiture | 6.8K | $109.53 | $743K |
| 2025-08-18 | WLDN | Willdan Group, Inc. | A - Grant or award | 13.0K | $0.00 |
Companies - Last 90 Days
- Willdan Group, Inc. (WLDN) - 2 filings, last 2026-05-15
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades at the companies Michael A. Bieber has recently filed at. Multiple unrelated insiders buying the same stock within a short window - cluster buying - has historically been one of the strongest Form 4 signals.
- Thomas Donald Brisbin - $41.49M of WLDN open-market activity in the last 12 months
- Micah Chen - $1.06M of WLDN open-market activity in the last 12 months
- Creighton K. Early - $905K of WLDN open-market activity in the last 12 months
- Steven A. Cohen - $782K of WLDN open-market activity in the last 12 months
- Dennis V. McGinn - $776K of WLDN open-market activity in the last 12 months
- Cynthia Downes - $302K of WLDN open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
- Andrew J. Mills
- Charles N. Mills
- Kevin J. Mills
- Mink Brook Asset Management LLC
- Shankh Mitra
- MITSUI SUMITOMO INSURANCE CO LTD
- Arturo R. Moreno
- Matthew T. Moroun
Frequently Asked Questions
Who is Michael A. Bieber?
Michael A. Bieber is a corporate insider at Willdan Group, Inc. (WLDN). Bieber has reported 13 insider filings with the SEC since 2024. The most recent filing was in May 2026.…
How many SEC Form 4 filings has Michael A. Bieber submitted recently?
2 primary Form 4 filings in the last 90 days, covering 1 company.
Has Michael A. Bieber been buying or selling stock?
Recorded transactions: 0 open-market purchases and 8 open-market sales ($7.90M) across all tracked filings.
Where can I see all of Michael A. Bieber's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
Learn More
Open the live Michael A. Bieber profile on InsiderAlpha for real-time alerts, AI-scored trade ideas, and full transaction history.