Michael A. Bieber
PRESIDENT AND CEO at Willdan Group Inc.
Sits on 1 board. Last updated September 28, 2026
Time on boards
- Boards served
- 1
- Current seats
- 1
- Board service
- 3 years
- Director since
- 2024
3 years of board service in total across 1 board, counting each seat separately. Longest: Willdan Group Inc., 2 years.
Willdan Group Inc.
Director · PRESIDENT AND CEO
Chief executive roles
Willdan Group Inc.
· PRESIDENT AND CEO
Dates unknown
Insider trades
All notable trades →From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.
| Date | Company | Transaction | Shares | Price | Value |
|---|---|---|---|---|---|
| May 14, 2026 | Willdan Group Inc. | Option exercise | +40,009 | $16.27 | $650,946 |
| May 14, 2026 | Willdan Group Inc. | Option exercise | +16,667 | $28.19 | $469,843 |
| May 14, 2026 | Willdan Group Inc. | Open-market sale | −25,429 | $90.88 | $2,310,988 |
| May 14, 2026 | Willdan Group Inc. | Open-market sale | −23,015 | $91.95 | $2,116,229 |
| May 14, 2026 | Willdan Group Inc. | Open-market sale | −7,956 | $92.65 | $737,123 |
| May 14, 2026 | Willdan Group Inc. | Open-market sale | −276 | $93.74 | $25,872 |
| May 13, 2026 | Willdan Group Inc. | Option exercise | +9,991 | $16.27 | $162,554 |
| May 13, 2026 | Willdan Group Inc. | Open-market sale | −9,991 | $92.65 | $925,666 |
| Mar 25, 2026 | Willdan Group Inc. | Grant or award | +15,750 | — | — |
| Mar 25, 2026 | Willdan Group Inc. | Shares withheld for tax | −6,444 | $82.80 | $533,563 |
| Mar 20, 2026 | Willdan Group Inc. | Shares withheld for tax | −2,387 | $75.52 | $180,266 |
| Mar 17, 2026 | Willdan Group Inc. | Shares withheld for tax | −2,625 | $78.29 | $205,511 |
| Mar 16, 2026 | Willdan Group Inc. | Grant or award | +17,326 | — | — |
| Mar 16, 2026 | Willdan Group Inc. | Shares withheld for tax | −7,090 | $78.61 | $557,345 |
| Mar 11, 2026 | Willdan Group Inc. | Grant or award | +18,810 | — | — |
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