Katz Zachary
Officer · GRND
As of 2026-09-16, Katz Zachary has 35 Form 4 transactions on record across 1 company — 19 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 September in multiple years since 2025 — a recurring calendar cadence, more consistent with scheduled activity than a one-off decision.
Reconstructed holdings
- Direct $9.8M
- Indirect $0
| GRND | direct | 633,227 sh | $9.8M |
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 |
|---|---|---|---|---|---|---|---|
| 2026-09-14 | GRND | Sale | 15,227 @ $15.57 | $237K | −2.3% of holding | 633,227 | Form 4 |
| 2026-08-17 | GRND | Sale | 10,172 @ $15.83 | $161K | −1.5% of holding | 680,000 | Form 4 |
| 2026-08-03 | GRND | Sale | 12,979 @ $17.89 | $232K | −1.8% of holding | 690,172 | Form 4 |
| 2026-07-16 | GRND | Sale | 10,172 @ $15.95 | $162K | −1.4% of holding | 703,151 | Form 4 |
| 2026-07-01 | GRND | Sale | 12,800 @ $16.28 | $208K | −1.8% of holding | 713,323 | Form 4 |
| 2026-06-29 | GRND | Sale | 12,799 @ $14.65 | $188K | −1.7% of holding | 726,123 | Form 4 |
| 2026-06-17 | GRND | Sale | 10,172 @ $13.29 | $135K | −1.4% of holding | 738,922 | Form 4 |
| 2025-11-25 | GRND | Sale | 29,383 @ $12.52 | $368K | −6.0% of holding | 461,137 | Form 4 |
| 2025-11-13 | GRND | Sale | 13,781 @ $14.39 | $198K | −2.7% of holding | 490,520 | Form 4 |
| 2025-11-03 | GRND | Sale | 15,601 @ $13.73 | $214K | −2.8% of holding | 532,738 | Form 4 |
| 2025-10-13 | GRND | Sale | 4,622 @ $13.22 | $61K | −0.8% of holding | 548,339 | Form 4 |
| 2025-10-13 | GRND | Sale | 3,023 @ $12.23 | $37K | −0.5% of holding | 552,961 | Form 4 |
| 2025-09-15 | GRND | Sale | 7,644 @ $15.64 | $120K | −1.4% of holding | 555,984 | Form 4 |
| 2025-07-24 | GRND | Sale | 14,693 @ $19.25 | $283K | −2.4% of holding | 595,112 | Form 4 |
| 2025-07-03 | GRND | Sale | 14,692 @ $22.48 | $330K | −2.4% of holding | 609,805 | Form 4 |
| 2025-06-16 | GRND | Sale | 14,692 @ $23.47 | $345K | −2.3% of holding | 624,497 | Form 4 |
| 2025-03-11 | GRND | Sale | 1,700 @ $16.07 | $27K | −0.3% of holding | 615,158 | Form 4 |
| 2025-03-11 | GRND | Sale | 1,358 @ $16.42 | $22K | −0.2% of holding | 613,800 | Form 4 |
| 2025-02-11 | GRND | Sale | 3,057 @ $18.00 | $55K | −0.5% of holding | 577,549 | Form 4 |
| 2025-01-13 | GRND | Sale | 3,058 @ $16.40 | $50K | −0.5% of holding | 580,606 | Form 4 |
| 2024-12-11 | GRND | Sale | 3,058 @ $15.83 | $48K | −0.5% of holding | 583,664 | Form 4 |
14 award / exercise / gift records — not counted as purchases
| Date | Company | Action | Shares | Owned after | Filing |
|---|---|---|---|---|---|
| 2026-09-12 | GRND | Withheld for tax | 31,546 | 648,454 | Form 4 |
| 2026-04-06 | GRND | Withheld for tax | 10,050 | 749,094 | Form 4 |
| 2026-03-12 | GRND | Award / grant | 28,007 | 759,144 | Form 4 |
| 2025-11-30 | GRND | Award / grant | 270,000 | 760,520 | Form 4 |
| 2025-11-30 | GRND | Award / grant | 60,000 | 60,000 | Form 4 |
| 2025-11-30 | GRND | Award / grant | 15,000 | 15,000 | Form 4 |
| 2025-11-13 | GRND | Withheld for tax | 28,437 | 504,301 | Form 4 |
| 2025-09-15 | GRND | Withheld for tax | 31,484 | 563,628 | Form 4 |
| 2025-05-14 | GRND | Withheld for tax | 21,276 | 639,189 | Form 4 |
| 2025-05-12 | GRND | Award / grant | 41,897 | 660,465 | Form 4 |
| 2025-03-17 | GRND | Withheld for tax | 4,920 | 618,568 | Form 4 |
| 2025-03-07 | GRND | Award / grant | 9,688 | 623,488 | Form 4 |
| 2025-03-04 | GRND | Withheld for tax | 16,773 | 616,858 | Form 4 |
| 2025-02-26 | GRND | Award / grant | 46,082 | 623,631 | 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.