DUNN JEFFREY W
Director · SIBN
As of 2026-09-16, DUNN JEFFREY W has 31 Form 4 transactions on record across 1 company — 25 in the trailing 12 months.
Everything this person has disclosed to the SEC on Form 4 — across every company they file for — reconstructed from the public record. A filing history, not a tip sheet.
Pattern in the record: open-market sales filed in August in multiple years since 2025 — a recurring calendar cadence, more consistent with scheduled activity than a one-off decision.
Reconstructed holdings
Reconstructed from this person's own Form 4 filings — the total each filing reported owning afterward, priced at the close on the as-of date shown. A filed position can lag the real one.
Direct and indirect holdings (e.g. through a trust or fund) are tagged separately, as filed.
Trades by company
Filing ledger
| Date | Company | Action | Shares @ price | Value | Ownership Δ | Owned after | Filing |
|---|---|---|---|---|---|---|---|
| 2026-09-01 | SIBN | Sale | 18,633 @ $18.91 | $352K | −51.7% of holding | 17,424 | Form 4 |
| 2026-09-01 | SIBN | Sale | 1,367 @ $18.91 | $26K | −7.8% of holding | 16,057 | Form 4 |
| 2026-08-03 | SIBN | Sale | 20,000 @ $18.46 | $369K | −55.5% of holding | 16,057 | Form 4 |
| 2026-06-05 | SIBN | Sale | 3,575 @ $15.25 | $55K | −18.2% of holding | 16,057 | Form 4 |
| 2026-05-04 | SIBN | Sale | 337 @ $13.15 | $4K | −3.5% of holding | 9,157 | Form 4 |
| 2026-02-02 | SIBN | Sale | 337 @ $16.42 | $6K | −3.3% of holding | 9,970 | Form 4 |
| 2026-01-08 | SIBN | Sale | 20,000 @ $21.28 | $426K | −20.0% of holding | 80,115 | Form 4 |
| 2025-12-08 | SIBN | Sale | 18,759 @ $19.33 | $363K | −14.6% of holding | 110,115 | Form 4 |
| 2025-12-08 | SIBN | Sale | 1,241 @ $19.33 | $24K | −10.7% of holding | 10,307 | Form 4 |
| 2025-11-11 | SIBN | Sale | 56,852 @ $18.95 | $1.1M | −84.7% of holding | 10,307 | Form 4 |
| 2025-11-11 | SIBN | Sale | 23,148 @ $18.95 | $439K | −69.2% of holding | 10,307 | Form 4 |
| 2025-11-03 | SIBN | Sale | 293 @ $14.80 | $4K | −2.6% of holding | 10,831 | Form 4 |
| 2025-08-04 | SIBN | Sale | 293 @ $17.37 | $5K | −2.5% of holding | 11,647 | Form 4 |
| 2025-06-05 | SIBN | Sale | 3,377 @ $19.05 | $64K | −16.3% of holding | 17,354 | Form 4 |
| 2025-05-01 | SIBN | Sale | 336 @ $13.78 | $5K | −2.6% of holding | 12,536 | Form 4 |
| 2025-02-18 | SIBN | Sale | 1,619 @ $16.77 | $27K | −9.6% of holding | 15,191 | Form 4 |
| 2025-02-03 | SIBN | Sale | 337 @ $16.51 | $6K | −1.9% of holding | 17,290 | Form 4 |
14 award / exercise / gift records — not counted as purchases
| Date | Company | Action | Shares | Owned after | Filing |
|---|---|---|---|---|---|
| 2026-09-01 | SIBN | Option exercise | 18,633 | 34,690 | Form 4 |
| 2026-09-01 | SIBN | Option exercise | 1,367 | 36,057 | Form 4 |
| 2026-09-01 | SIBN | Option exercise | 1,367 | 104,893 | Form 4 |
| 2026-09-01 | SIBN | Option exercise | 18,633 | 86,260 | Form 4 |
| 2026-08-03 | SIBN | Option exercise | 20,000 | 36,057 | Form 4 |
| 2026-08-03 | SIBN | Option exercise | 20,000 | 106,260 | Form 4 |
| 2026-06-04 | SIBN | Award / grant | 10,957 | 20,114 | Form 4 |
| 2025-12-08 | SIBN | Option exercise | 1,241 | 11,548 | Form 4 |
| 2025-12-08 | SIBN | Option exercise | 1,241 | 0 | Form 4 |
| 2025-11-11 | SIBN | Option exercise | 56,852 | 90,307 | Form 4 |
| 2025-11-11 | SIBN | Option exercise | 23,148 | 33,455 | Form 4 |
| 2025-11-11 | SIBN | Option exercise | 23,148 | 58,093 | Form 4 |
| 2025-11-11 | SIBN | Option exercise | 56,852 | 1,241 | Form 4 |
| 2025-06-05 | SIBN | Award / grant | 8,675 | 21,211 | Form 4 |
Source: SEC Form 4 filings. Each row links to its original filing.
Research tool, not investment advice — historical frequencies, not recommendations. A product of Marovel Technologies LLC. Full terms.