SCHEDULE 13D/A

SCIENTIFIC INDUSTRIES INC

Common stock, par value $0.05 per share · CUSIP: 808757108

Event date: 2025-08-21

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• Brian L. Pessin

  Shares: 397,531 · Class: 3.3%

• Norman H. Pessin

  Shares: 570,000 · Class: 4.7%

• PESSIN SANDRA FReported CIK 0000936979

  Shares: 466,507 · Class: 3.9%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.