O'Brien Michael Graham

Officer · GTM, ZI

As of 2026-09-16, O'Brien Michael Graham has 237 Form 4 transactions on record across 2 companies — 142 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.

Reconstructed holdings

Direct: $1.7MIndirect: $0$1.7Mas of 2026-09-16
  • Direct $1.7M
  • Indirect $0
GTMdirect300,489 sh$1.2M
ZIdirect48,890 sh$496K

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

GTM · 187 trades
2026-09-01: Withheld for tax, 268 sh ($1K)2026-09-01: Option exercise, 328 sh ($0)2026-09-01: Option exercise, 214 sh ($0)2026-09-01: Option exercise, 214 sh2026-09-01: Option exercise, 328 sh2026-09-01: Option exercise, 214 sh2026-09-01: Option exercise, 214 sh2026-09-01: Option exercise, 328 sh2026-09-01: Option exercise, 214 sh2026-09-01: Option exercise, 328 sh2026-09-01: Option exercise, 328 sh2026-08-06: Sale, 5,000 sh ($20K)2026-08-01: Withheld for tax, 61,073 sh ($202K)2026-08-01: Withheld for tax, 758 sh ($3K)2026-08-01: Option exercise, 91,384 sh ($0)2026-08-01: Option exercise, 3,469 sh ($0)2026-08-01: Option exercise, 1,541 sh ($0)2026-08-01: Option exercise, 29,400 sh ($0)2026-08-01: Option exercise, 1,541 sh2026-08-01: Option exercise, 91,384 sh2026-08-01: Option exercise, 29,400 sh2026-08-01: Option exercise, 3,469 sh2026-08-01: Option exercise, 1,541 sh2026-08-01: Option exercise, 91,384 sh2026-08-01: Option exercise, 29,400 sh2026-08-01: Option exercise, 3,469 sh2026-07-01: Withheld for tax, 32,781 sh ($96K)2026-07-01: Option exercise, 7,118 sh ($0)2026-07-01: Option exercise, 7,812 sh ($0)2026-07-01: Option exercise, 49,218 sh ($0)2026-07-01: Option exercise, 223 sh ($0)2026-07-01: Option exercise, 1,555 sh ($0)2026-07-01: Option exercise, 764 sh ($0)2026-07-01: Option exercise, 7,118 sh2026-07-01: Option exercise, 7,812 sh2026-07-01: Option exercise, 764 sh2026-07-01: Option exercise, 223 sh2026-07-01: Option exercise, 1,555 sh2026-07-01: Option exercise, 223 sh2026-07-01: Option exercise, 1,555 sh2026-07-01: Option exercise, 49,218 sh2026-07-01: Option exercise, 49,218 sh2026-07-01: Option exercise, 7,118 sh2026-07-01: Option exercise, 7,812 sh2026-07-01: Option exercise, 764 sh2026-06-01: Withheld for tax, 268 sh ($892)2026-06-01: Option exercise, 214 sh ($0)2026-06-01: Option exercise, 328 sh ($0)2026-06-01: Option exercise, 214 sh2026-06-01: Option exercise, 328 sh2026-06-01: Option exercise, 214 sh2026-06-01: Option exercise, 328 sh2026-05-29: Award / grant, 393,750 sh ($0)2026-05-01: Withheld for tax, 1,706 sh ($11K)2026-05-01: Withheld for tax, 758 sh ($5K)2026-05-01: Option exercise, 3,469 sh ($0)2026-05-01: Option exercise, 1,542 sh ($0)2026-05-01: Option exercise, 3,469 sh2026-05-01: Option exercise, 1,542 sh2026-05-01: Option exercise, 1,542 sh2026-05-01: Option exercise, 3,469 sh2026-04-01: Withheld for tax, 18,054 sh ($108K)2026-04-01: Option exercise, 28,050 sh ($0)2026-04-01: Option exercise, 7,813 sh ($0)2026-04-01: Option exercise, 765 sh ($0)2026-04-01: Option exercise, 224 sh ($0)2026-04-01: Option exercise, 1,554 sh ($0)2026-04-01: Option exercise, 224 sh2026-04-01: Option exercise, 29,400 sh2026-04-01: Option exercise, 765 sh2026-04-01: Option exercise, 1,554 sh2026-04-01: Option exercise, 224 sh2026-04-01: Option exercise, 1,554 sh2026-04-01: Option exercise, 28,050 sh2026-04-01: Option exercise, 28,050 sh2026-04-01: Option exercise, 7,813 sh2026-04-01: Option exercise, 29,400 sh2026-04-01: Option exercise, 765 sh2026-04-01: Option exercise, 7,813 sh2026-03-01: Withheld for tax, 186 sh ($1K)2026-03-01: Option exercise, 328 sh ($0)2026-03-01: Option exercise, 213 sh ($0)2026-03-01: Option exercise, 328 sh2026-03-01: Option exercise, 328 sh2026-03-01: Option exercise, 213 sh2026-03-01: Option exercise, 213 sh2026-02-05: Withheld for tax, 33,512 sh ($230K)2026-02-05: Option exercise, 71,777 sh ($0)2026-02-05: Option exercise, 26,378 sh ($0)2026-02-05: Option exercise, 71,777 sh2026-02-05: Option exercise, 26,378 sh2026-02-05: Option exercise, 26,378 sh2026-02-05: Option exercise, 71,777 sh2026-02-01: Withheld for tax, 1,369 sh ($11K)2026-02-01: Withheld for tax, 609 sh ($5K)2026-02-01: Option exercise, 3,468 sh ($0)2026-02-01: Option exercise, 1,542 sh ($0)2026-02-01: Option exercise, 3,468 sh2026-02-01: Option exercise, 3,468 sh2026-02-01: Option exercise, 1,542 sh2026-02-01: Option exercise, 1,542 sh2026-01-01: Withheld for tax, 4,086 sh ($42K)2026-01-01: Option exercise, 764 sh ($0)2026-01-01: Option exercise, 223 sh ($0)2026-01-01: Option exercise, 1,555 sh ($0)2026-01-01: Option exercise, 7,812 sh ($0)2026-01-01: Option exercise, 764 sh2026-01-01: Option exercise, 223 sh2026-01-01: Option exercise, 1,555 sh2026-01-01: Option exercise, 7,812 sh2026-01-01: Option exercise, 7,812 sh2026-01-01: Option exercise, 764 sh2026-01-01: Option exercise, 223 sh2026-01-01: Option exercise, 1,555 sh2025-12-01: Withheld for tax, 187 sh ($2K)2025-12-01: Withheld for tax, 174 sh ($2K)2025-12-01: Option exercise, 214 sh ($0)2025-12-01: Option exercise, 507 sh ($0)2025-12-01: Option exercise, 328 sh ($0)2025-12-01: Option exercise, 328 sh2025-12-01: Option exercise, 507 sh2025-12-01: Option exercise, 507 sh2025-12-01: Option exercise, 214 sh2025-12-01: Option exercise, 328 sh2025-12-01: Option exercise, 214 sh2025-11-01: Withheld for tax, 1,185 sh ($13K)2025-11-01: Withheld for tax, 527 sh ($6K)2025-11-01: Option exercise, 3,469 sh ($0)2025-11-01: Option exercise, 1,541 sh ($0)2025-11-01: Option exercise, 1,541 sh2025-11-01: Option exercise, 3,469 sh2025-11-01: Option exercise, 1,541 sh2025-11-01: Option exercise, 3,469 sh2025-10-01: Withheld for tax, 11,542 sh ($126K)2025-10-01: Option exercise, 223 sh ($0)2025-10-01: Option exercise, 31,250 sh ($0)2025-10-01: Option exercise, 764 sh ($0)2025-10-01: Option exercise, 1,555 sh ($0)2025-10-01: Option exercise, 764 sh2025-10-01: Option exercise, 223 sh2025-10-01: Option exercise, 1,555 sh2025-10-01: Option exercise, 31,250 sh2025-09-01: Withheld for tax, 263 sh ($3K)2025-09-01: Withheld for tax, 170 sh ($2K)2025-09-01: Option exercise, 327 sh ($0)2025-09-01: Option exercise, 214 sh ($0)2025-09-01: Option exercise, 240 sh ($0)2025-09-01: Option exercise, 506 sh ($0)2025-09-01: Option exercise, 214 sh2025-09-01: Option exercise, 240 sh2025-09-01: Option exercise, 214 sh2025-09-01: Option exercise, 240 sh2025-09-01: Option exercise, 327 sh2025-09-01: Option exercise, 506 sh2025-09-01: Option exercise, 506 sh2025-09-01: Option exercise, 327 sh2025-08-01: Withheld for tax, 1,156 sh ($13K)2025-08-01: Withheld for tax, 514 sh ($6K)2025-08-01: Option exercise, 1,542 sh ($0)2025-08-01: Option exercise, 3,469 sh ($0)2025-08-01: Option exercise, 1,542 sh2025-08-01: Option exercise, 3,469 sh2025-08-01: Option exercise, 1,542 sh2025-08-01: Option exercise, 3,469 sh2025-07-31: Award / grant, 276,924 sh ($0)2025-07-01: Withheld for tax, 848 sh ($9K)2025-07-01: Option exercise, 223 sh ($0)2025-07-01: Option exercise, 765 sh ($0)2025-07-01: Option exercise, 1,555 sh ($0)2025-07-01: Option exercise, 765 sh2025-07-01: Option exercise, 223 sh2025-07-01: Option exercise, 1,555 sh2025-06-01: Withheld for tax, 261 sh ($2K)2025-06-01: Withheld for tax, 169 sh ($2K)2025-06-01: Option exercise, 328 sh ($0)2025-06-01: Option exercise, 507 sh ($0)2025-06-01: Option exercise, 213 sh ($0)2025-06-01: Option exercise, 240 sh ($0)2025-06-01: Option exercise, 328 sh2025-06-01: Option exercise, 328 sh2025-06-01: Option exercise, 213 sh2025-06-01: Option exercise, 240 sh2025-06-01: Option exercise, 507 sh2025-06-01: Option exercise, 213 sh2025-06-01: Option exercise, 240 sh2025-06-01: Option exercise, 507 sh2025-05-15: Award / grant, 85,000 sh ($0)
ZI · 50 trades
2025-05-01: Withheld for tax, 1,156 sh ($10K)2025-05-01: Withheld for tax, 514 sh ($4K)2025-05-01: Option exercise, 3,469 sh ($0)2025-05-01: Option exercise, 1,542 sh ($0)2025-05-01: Option exercise, 3,469 sh2025-05-01: Option exercise, 1,542 sh2025-05-01: Option exercise, 3,469 sh2025-05-01: Option exercise, 1,542 sh2025-04-01: Withheld for tax, 848 sh ($8K)2025-04-01: Option exercise, 224 sh ($0)2025-04-01: Option exercise, 764 sh ($0)2025-04-01: Option exercise, 1,554 sh ($0)2025-04-01: Option exercise, 1,554 sh2025-04-01: Option exercise, 764 sh2025-04-01: Option exercise, 224 sh2025-04-01: Option exercise, 1,554 sh2025-04-01: Option exercise, 224 sh2025-04-01: Option exercise, 764 sh2025-03-01: Withheld for tax, 262 sh ($3K)2025-03-01: Withheld for tax, 169 sh ($2K)2025-03-01: Option exercise, 328 sh ($0)2025-03-01: Option exercise, 214 sh ($0)2025-03-01: Option exercise, 240 sh ($0)2025-03-01: Option exercise, 506 sh ($0)2025-03-01: Option exercise, 328 sh2025-03-01: Option exercise, 506 sh2025-03-01: Option exercise, 328 sh2025-03-01: Option exercise, 240 sh2025-03-01: Option exercise, 214 sh2025-03-01: Option exercise, 214 sh2025-03-01: Option exercise, 240 sh2025-03-01: Option exercise, 506 sh2025-02-01: Withheld for tax, 1,339 sh ($14K)2025-02-01: Withheld for tax, 595 sh ($6K)2025-02-01: Option exercise, 3,468 sh ($0)2025-02-01: Option exercise, 1,541 sh ($0)2025-02-01: Option exercise, 1,541 sh2025-02-01: Option exercise, 3,468 sh2025-02-01: Option exercise, 1,541 sh2025-02-01: Option exercise, 3,468 sh2025-01-01: Withheld for tax, 984 sh ($10K)2025-01-01: Option exercise, 765 sh ($0)2025-01-01: Option exercise, 223 sh ($0)2025-01-01: Option exercise, 1,555 sh ($0)2025-01-01: Option exercise, 1,555 sh2025-01-01: Option exercise, 765 sh2025-01-01: Option exercise, 765 sh2025-01-01: Option exercise, 223 sh2025-01-01: Option exercise, 223 sh2025-01-01: Option exercise, 1,555 sh

Filing ledger

DateCompanyActionShares @ priceValueOwnership ΔOwned afterFiling
2026-08-06GTMSale5,000 @ $4.00$20K−1.6% of holding299,947Form 4
236 award / exercise / gift records — not counted as purchases
DateCompanyActionSharesOwned afterFiling
2026-09-01GTMWithheld for tax268300,221Form 4
2026-09-01GTMOption exercise328328Form 4
2026-09-01GTMOption exercise2140Form 4
2026-09-01GTMOption exercise214300,489Form 4
2026-09-01GTMOption exercise328300,275Form 4
2026-09-01GTMOption exercise214300,489Form 4
2026-09-01GTMOption exercise214300,489Form 4
2026-09-01GTMOption exercise328300,275Form 4
2026-09-01GTMOption exercise214300,489Form 4
2026-09-01GTMOption exercise328300,275Form 4
2026-09-01GTMOption exercise328300,275Form 4
2026-08-01GTMWithheld for tax61,073304,947Form 4
2026-08-01GTMWithheld for tax758366,020Form 4
2026-08-01GTMOption exercise91,384185,540Form 4
2026-08-01GTMOption exercise3,46917,344Form 4
2026-08-01GTMOption exercise1,5411,542Form 4
2026-08-01GTMOption exercise29,4000Form 4
2026-08-01GTMOption exercise1,541242,525Form 4
2026-08-01GTMOption exercise91,384366,778Form 4
2026-08-01GTMOption exercise29,400275,394Form 4
2026-08-01GTMOption exercise3,469245,994Form 4
2026-08-01GTMOption exercise1,541242,525Form 4
2026-08-01GTMOption exercise91,384366,778Form 4
2026-08-01GTMOption exercise29,400275,394Form 4
2026-08-01GTMOption exercise3,469245,994Form 4
2026-07-01GTMWithheld for tax32,781240,984Form 4
2026-07-01GTMOption exercise7,11849,832Form 4
2026-07-01GTMOption exercise7,81270,313Form 4
2026-07-01GTMOption exercise49,218344,532Form 4
2026-07-01GTMOption exercise223670Form 4
2026-07-01GTMOption exercise1,5553,110Form 4
2026-07-01GTMOption exercise7643,823Form 4
2026-07-01GTMOption exercise7,118224,547Form 4
2026-07-01GTMOption exercise7,812217,429Form 4
2026-07-01GTMOption exercise764209,617Form 4
2026-07-01GTMOption exercise223208,853Form 4
2026-07-01GTMOption exercise1,555208,630Form 4
2026-07-01GTMOption exercise223208,853Form 4
2026-07-01GTMOption exercise1,555208,630Form 4
2026-07-01GTMOption exercise49,218273,765Form 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.