SEC Form 4 · Updated Daily
ISSC
Insider and institutional ownership derived from SEC Form 4 filings. Click any owner to see their holdings across every company they’ve filed on, and how their position has changed over time.
Current Reporting Owners
| Owner | Role | Shares Owned | As Of | Last Activity |
|---|---|---|---|---|
| Harborne Christopher | 10%+ Owner | 1,583,411 | 2025-06-30 | S |
| Askarpour Shahram | Officer | 495,035 | 2026-05-18 | F |
| BRESSNER GLEN R | Director | 153,655 | 2026-05-20 | A |
| DiGiovanni Jeffrey | Officer | 86,238 | 2026-07-08 | F |
| Carolin Roger Anthony | Director | 83,188 | 2026-04-16 | A |
| Belland Stephen L | Director | 42,559 | 2026-04-16 | A |
| Dean Garry C. | Director | 29,408 | 2026-04-16 | A |
| Devine Denise L | Director | 20,622 | 2026-04-16 | A |
| Silfen Richard A | Director | 7,508 | 2026-04-16 | A |
Recent Filings
| Date | Owner | Activity | Shares | Price | Owned After |
|---|---|---|---|---|---|
| 2026-07-14 | Askarpour Shahram | Grant / award (derivative) | 68,966 | $0.00 | 68,966 |
| 2026-07-14 | DiGiovanni Jeffrey | Grant / award (derivative) | 21,793 | $0.00 | 21,793 |
| 2026-07-08 | DiGiovanni Jeffrey | Tax withholding | 749 | $18.31 | 86,238 |
| 2026-06-30 | DiGiovanni Jeffrey | Tax withholding | 910 | $18.00 | 86,987 |
| 2026-05-20 | BRESSNER GLEN R | Grant / award | 6,300 | $15.93 | 153,655 |
| 2026-05-18 | DiGiovanni Jeffrey | Tax withholding | 474 | $16.26 | 87,897 |
| 2026-05-18 | Askarpour Shahram | Tax withholding | 906 | $16.26 | 495,035 |
| 2026-04-16 | Belland Stephen L | Grant / award | 5,618 | $0.00 | 42,559 |
| 2026-04-16 | BRESSNER GLEN R | Grant / award | 5,618 | $0.00 | 147,355 |
| 2026-04-16 | Carolin Roger Anthony | Grant / award | 5,618 | $0.00 | 83,188 |
| 2026-04-16 | Silfen Richard A | Grant / award | 5,618 | $0.00 | 7,508 |
| 2026-04-16 | Dean Garry C. | Grant / award | 5,618 | $0.00 | 29,408 |
| 2026-04-16 | Devine Denise L | Grant / award | 5,618 | $0.00 | 20,622 |
| 2026-04-16 | Devine Denise L | Disposition to issuer | 5,403 | $0.00 | 15,004 |
| 2026-04-08 | DiGiovanni Jeffrey | Tax withholding | 765 | $23.02 | 88,371 |
| 2026-03-31 | DiGiovanni Jeffrey | Tax withholding | 897 | $20.53 | 89,136 |
| 2026-02-22 | Askarpour Shahram | Tax withholding | 2,876 | $24.32 | 495,941 |
| 2026-02-18 | DiGiovanni Jeffrey | Tax withholding | 2,172 | $23.52 | 90,033 |
| 2026-02-18 | Askarpour Shahram | Tax withholding | 3,625 | $23.52 | 498,817 |
| 2026-02-17 | DiGiovanni Jeffrey | Grant / award (derivative) | 9,455 | $0.00 | 9,455 |
| 2026-02-17 | DiGiovanni Jeffrey | Grant / award (derivative) | 16,108 | $0.00 | 16,108 |
| 2026-02-17 | DiGiovanni Jeffrey | Grant / award | 9,455 | $0.00 | 92,205 |
| 2026-02-17 | Askarpour Shahram | Grant / award (derivative) | 20,171 | $0.00 | 20,171 |
| 2026-02-17 | Askarpour Shahram | Grant / award (derivative) | 34,364 | $0.00 | 34,364 |
| 2026-02-17 | Askarpour Shahram | Grant / award | 20,171 | $0.00 | 502,442 |
| 2026-02-17 | Silfen Richard A | Grant / award | 1,890 | $0.00 | 1,890 |
| 2026-02-17 | Askarpour Shahram | Grant / award (derivative) | 45,455 | $0.00 | 45,455 |
| 2026-02-17 | Askarpour Shahram | Grant / award (derivative) | 34,364 | $0.00 | 34,364 |
| 2026-02-17 | Askarpour Shahram | Grant / award | 20,171 | $19.83 | 502,442 |
| 2026-02-17 | DiGiovanni Jeffrey | Grant / award (derivative) | 21,307 | $0.00 | 21,307 |
| 2026-02-17 | DiGiovanni Jeffrey | Grant / award (derivative) | 16,108 | $0.00 | 16,108 |
| 2026-02-17 | DiGiovanni Jeffrey | Grant / award | 9,455 | $19.83 | 92,205 |
| 2026-01-13 | DiGiovanni Jeffrey | Tax withholding | 868 | $18.80 | 82,750 |
| 2026-01-11 | Askarpour Shahram | Tax withholding | 2,128 | $18.41 | 482,271 |
| 2025-12-31 | DiGiovanni Jeffrey | Tax withholding | 1,000 | $18.94 | 83,618 |
| 2025-11-20 | Askarpour Shahram | Option exercise (derivative) | 201,000 | $0.00 | 0 |
| 2025-11-20 | Askarpour Shahram | Option exercise | 201,000 | — | 572,317 |
| 2025-11-20 | Askarpour Shahram | Option exercise (derivative) | 201,000 | $0.00 | 0 |
| 2025-11-20 | Askarpour Shahram | Tax withholding | 87,918 | $8.42 | 484,399 |
| 2025-11-20 | Askarpour Shahram | Option exercise | 201,000 | — | 572,317 |
Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.