Brosius Mark
Officer · ISRG
As of 2026-09-27, Brosius Mark has 117 Form 4 transactions on record across 1 company — 53 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 May in multiple years since 2024 — a recurring calendar cadence, more consistent with scheduled activity than a one-off decision.
Reconstructed holdings
- Direct $310K
- Indirect $0
| ISRG | direct | 764 sh | $310K |
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 |
|---|---|---|---|---|---|---|---|
| 2026-09-11 | ISRG | Sale | 25 @ $365.79 | $9K | −3.2% of holding | 764 | Form 4 |
| 2026-09-10 | ISRG | Sale | 23 @ $347.66 | $8K | −2.8% of holding | 789 | Form 4 |
| 2026-09-09 | ISRG | Sale | 23 @ $350.20 | $8K | −2.8% of holding | 812 | Form 4 |
| 2026-09-08 | ISRG | Sale | 46 @ $361.23 | $17K | −5.2% of holding | 835 | Form 4 |
| 2026-08-21 | ISRG | Sale | 77 @ $375.57 | $29K | −8.0% of holding | 881 | Form 4 |
| 2026-08-20 | ISRG | Sale | 77 @ $396.37 | $31K | −7.4% of holding | 958 | Form 4 |
| 2026-08-19 | ISRG | Sale | 77 @ $394.26 | $30K | −6.9% of holding | 1,035 | Form 4 |
| 2026-08-18 | ISRG | Sale | 77 @ $394.00 | $30K | −6.5% of holding | 1,112 | Form 4 |
| 2026-08-17 | ISRG | Sale | 77 @ $390.67 | $30K | −6.1% of holding | 1,189 | Form 4 |
| 2026-07-31 | ISRG | Sale | 28 @ $351.00 | $10K | −2.2% of holding | 1,266 | Form 4 |
| 2026-07-30 | ISRG | Sale | 28 @ $346.83 | $10K | −2.1% of holding | 1,294 | Form 4 |
| 2026-07-29 | ISRG | Sale | 28 @ $360.21 | $10K | −2.1% of holding | 1,322 | Form 4 |
| 2026-07-28 | ISRG | Sale | 28 @ $365.58 | $10K | −2.0% of holding | 1,350 | Form 4 |
| 2026-07-27 | ISRG | Sale | 28 @ $344.00 | $10K | −2.0% of holding | 1,378 | Form 4 |
| 2026-06-12 | ISRG | Sale | 25 @ $414.13 | $10K | −1.7% of holding | 1,406 | Form 4 |
| 2026-06-11 | ISRG | Sale | 23 @ $412.16 | $9K | −1.6% of holding | 1,431 | Form 4 |
| 2026-06-10 | ISRG | Sale | 23 @ $424.14 | $10K | −1.6% of holding | 1,454 | Form 4 |
| 2026-06-09 | ISRG | Sale | 23 @ $421.13 | $10K | −1.5% of holding | 1,477 | Form 4 |
| 2026-06-08 | ISRG | Sale | 23 @ $420.12 | $10K | −1.5% of holding | 1,500 | Form 4 |
| 2026-05-22 | ISRG | Sale | 18 @ $439.80 | $8K | −1.2% of holding | 1,523 | Form 4 |
| 2026-05-21 | ISRG | Sale | 18 @ $446.04 | $8K | −1.2% of holding | 1,541 | Form 4 |
| 2026-05-20 | ISRG | Sale | 18 @ $440.38 | $8K | −1.1% of holding | 1,559 | Form 4 |
| 2026-05-19 | ISRG | Sale | 18 @ $440.70 | $8K | −1.1% of holding | 1,577 | Form 4 |
| 2026-05-18 | ISRG | Sale | 18 @ $422.47 | $8K | −1.1% of holding | 1,595 | Form 4 |
| 2026-03-09 | ISRG | Sale | 645 @ $485.01 | $313K | −28.6% of holding | 1,613 | Form 4 |
| 2026-03-06 | ISRG | Sale | 648 @ $490.19 | $318K | −22.3% of holding | 2,258 | Form 4 |
| 2026-03-05 | ISRG | Sale | 648 @ $495.20 | $321K | −18.2% of holding | 2,906 | Form 4 |
| 2026-03-04 | ISRG | Sale | 2,362 @ $498.68 | $1.2M | −39.9% of holding | 3,554 | Form 4 |
| 2026-03-03 | ISRG | Sale | 648 @ $488.10 | $316K | −9.9% of holding | 5,916 | Form 4 |
| 2025-12-15 | ISRG | Sale | 464 @ $548.49 | $254K | −51.2% of holding | 443 | Form 4 |
| 2025-12-15 | ISRG | Sale | 464 @ $548.49 | $254K | −78.0% of holding | 131 | Form 4 |
| 2025-12-12 | ISRG | Sale | 4,500 @ $547.36 | $2.5M | −83.2% of holding | 907 | Form 4 |
| 2025-06-06 | ISRG | Sale | 216 @ $563.11 | $122K | −19.2% of holding | 907 | Form 4 |
| 2025-06-05 | ISRG | Sale | 215 @ $560.70 | $121K | −16.1% of holding | 1,123 | Form 4 |
| 2025-06-04 | ISRG | Sale | 215 @ $552.07 | $119K | −13.8% of holding | 1,338 | Form 4 |
| 2025-06-03 | ISRG | Sale | 215 @ $550.68 | $118K | −12.2% of holding | 1,553 | Form 4 |
| 2025-06-02 | ISRG | Sale | 215 @ $549.06 | $118K | −10.8% of holding | 1,768 | Form 4 |
| 2025-05-16 | ISRG | Sale | 20 @ $563.81 | $11K | −1.0% of holding | 1,983 | Form 4 |
| 2025-05-15 | ISRG | Sale | 22 @ $560.00 | $12K | −1.1% of holding | 2,003 | Form 4 |
| 2025-05-14 | ISRG | Sale | 22 @ $563.00 | $12K | −1.1% of holding | 2,025 | Form 4 |
| 2025-05-13 | ISRG | Sale | 22 @ $561.67 | $12K | −1.1% of holding | 2,047 | Form 4 |
| 2025-05-12 | ISRG | Sale | 22 @ $551.97 | $12K | −1.1% of holding | 2,069 | Form 4 |
| 2025-03-07 | ISRG | Sale | 489 @ $533.18 | $261K | −19.0% of holding | 2,091 | Form 4 |
| 2025-03-06 | ISRG | Sale | 492 @ $558.95 | $275K | −16.0% of holding | 2,580 | Form 4 |
| 2025-03-05 | ISRG | Sale | 492 @ $554.17 | $273K | −13.8% of holding | 3,072 | Form 4 |
| 2025-03-04 | ISRG | Sale | 492 @ $563.69 | $277K | −12.1% of holding | 3,564 | Form 4 |
| 2025-03-03 | ISRG | Sale | 492 @ $573.78 | $282K | −10.8% of holding | 4,056 | Form 4 |
| 2024-10-28 | ISRG | Sale | 22 @ $513.66 | $11K | −10.6% of holding | 185 | Form 4 |
| 2024-10-25 | ISRG | Sale | 22 @ $514.00 | $11K | −9.6% of holding | 207 | Form 4 |
| 2024-10-24 | ISRG | Sale | 22 @ $510.79 | $11K | −8.8% of holding | 229 | Form 4 |
| 2024-10-23 | ISRG | Sale | 22 @ $513.89 | $11K | −8.1% of holding | 251 | Form 4 |
| 2024-10-22 | ISRG | Sale | 2,106 @ $515.00 | $1.1M | −87.7% of holding | 295 | Form 4 |
| 2024-10-22 | ISRG | Sale | 22 @ $515.00 | $11K | −7.5% of holding | 273 | Form 4 |
| 2024-09-12 | — | Sale | 2,115 @ $491.91 | $1.0M | −87.8% of holding | 295 | Form 4 |
| 2024-05-17 | ISRG | Sale | 63 @ $396.19 | $25K | −17.6% of holding | 295 | Form 4 |
| 2024-05-16 | ISRG | Sale | 175 @ $398.28 | $70K | −32.8% of holding | 358 | Form 4 |
| 2024-05-15 | ISRG | Sale | 175 @ $387.22 | $68K | −24.7% of holding | 533 | Form 4 |
| 2024-05-14 | ISRG | Sale | 175 @ $380.85 | $67K | −19.8% of holding | 708 | Form 4 |
| 2024-05-13 | ISRG | Sale | 175 @ $389.16 | $68K | −16.5% of holding | 883 | Form 4 |
| 2024-03-11 | ISRG | Sale | 196 @ $390.16 | $76K | −15.6% of holding | 1,058 | Form 4 |
| 2024-03-08 | ISRG | Sale | 196 @ $392.02 | $77K | −13.5% of holding | 1,254 | Form 4 |
| 2024-03-07 | ISRG | Sale | 196 @ $393.30 | $77K | −11.9% of holding | 1,450 | Form 4 |
| 2024-03-06 | ISRG | Sale | 196 @ $386.76 | $76K | −10.6% of holding | 1,646 | Form 4 |
| 2024-03-05 | ISRG | Sale | 196 @ $400.00 | $78K | −9.6% of holding | 1,842 | Form 4 |
| 2024-02-16 | ISRG | Sale | 32 @ $378.29 | $12K | −4.3% of holding | 709 | Form 4 |
| 2024-02-15 | ISRG | Sale | 30 @ $382.03 | $11K | −3.9% of holding | 741 | Form 4 |
| 2024-02-14 | ISRG | Sale | 30 @ $380.09 | $11K | −3.7% of holding | 771 | Form 4 |
50 award / exercise / gift records — not counted as purchases
| Date | Company | Action | Shares | Owned after | Filing |
|---|---|---|---|---|---|
| 2026-02-28 | ISRG | Withheld for tax | 4,155 | 6,564 | Form 4 |
| 2026-02-28 | ISRG | Withheld for tax | 435 | 2,341 | Form 4 |
| 2026-02-28 | ISRG | Option exercise | 877 | 0 | Form 4 |
| 2026-02-28 | ISRG | Option exercise | 8,378 | 10,719 | Form 4 |
| 2026-02-28 | ISRG | Option exercise | 877 | 2,776 | Form 4 |
| 2026-02-28 | ISRG | Option exercise | 8,378 | 0 | Form 4 |
| 2026-02-26 | ISRG | Withheld for tax | 805 | 1,409 | Form 4 |
| 2026-02-26 | ISRG | Withheld for tax | 483 | 1,899 | Form 4 |
| 2026-02-26 | ISRG | Award / grant | 4,928 | 4,928 | Form 4 |
| 2026-02-26 | ISRG | Option exercise | 1,622 | 2,214 | Form 4 |
| 2026-02-26 | ISRG | Option exercise | 973 | 2,918 | Form 4 |
| 2026-02-26 | ISRG | Option exercise | 1,622 | 3,243 | Form 4 |
| 2026-02-26 | ISRG | Award / grant | 2,793 | 8,378 | Form 4 |
| 2026-02-26 | ISRG | Option exercise | 973 | 2,382 | Form 4 |
| 2026-02-10 | ISRG | Withheld for tax | 433 | 592 | Form 4 |
| 2026-02-10 | ISRG | Option exercise | 838 | 838 | Form 4 |
| 2026-02-10 | ISRG | Option exercise | 838 | 1,025 | Form 4 |
| 2026-01-28 | ISRG | Award / grant | 5,585 | 5,585 | Form 4 |
| 2026-01-28 | ISRG | Award / grant | 2,702 | 2,702 | Form 4 |
| 2025-12-12 | ISRG | Option exercise | 4,500 | 5,407 | Form 4 |
| 2025-12-12 | ISRG | Option exercise | 4,500 | 0 | Form 4 |
| 2025-02-28 | ISRG | Withheld for tax | 2,175 | 4,548 | Form 4 |
| 2025-02-28 | ISRG | Withheld for tax | 435 | 6,723 | Form 4 |
| 2025-02-28 | ISRG | Option exercise | 877 | 7,158 | Form 4 |
| 2025-02-28 | ISRG | Option exercise | 877 | 877 | Form 4 |
| 2025-02-27 | ISRG | Award / grant | 4,385 | 6,281 | Form 4 |
| 2025-02-26 | ISRG | Withheld for tax | 805 | 1,465 | Form 4 |
| 2025-02-26 | ISRG | Withheld for tax | 424 | 1,896 | Form 4 |
| 2025-02-26 | ISRG | Option exercise | 855 | 2,320 | Form 4 |
| 2025-02-26 | ISRG | Award / grant | 3,891 | 3,891 | Form 4 |
| 2025-02-26 | ISRG | Option exercise | 1,622 | 2,270 | Form 4 |
| 2025-02-26 | ISRG | Option exercise | 1,622 | 4,865 | Form 4 |
| 2025-02-26 | ISRG | Option exercise | 855 | 0 | Form 4 |
| 2025-02-10 | ISRG | Withheld for tax | 430 | 648 | Form 4 |
| 2025-02-10 | ISRG | Option exercise | 838 | 1,676 | Form 4 |
| 2025-02-10 | ISRG | Option exercise | 838 | 1,078 | Form 4 |
| 2024-10-22 | ISRG | Option exercise | 2,106 | 2,401 | Form 4 |
| 2024-10-22 | ISRG | Option exercise | 2,106 | 0 | Form 4 |
| 2024-09-12 | — | Option exercise | 2,115 | 2,410 | Form 4 |
| 2024-09-12 | — | Option exercise | 2,115 | 0 | 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.