Dunbar David A.

Director · Officer · SXI, WTS

As of 2026-09-16, Dunbar David A. has 83 Form 4 transactions on record across 2 companies — 66 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

Direct: $8.6MIndirect: $23.1M$31.7Mas of 2026-09-16
  • Direct $8.6M
  • Indirect $23.1M
SXIindirect75,973 sh$19.7M
SXIdirect32,600 sh$8.5M
WTSindirect9,800 sh$3.4M
WTSdirect456 sh$159K

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

SXI · 79 trades
2026-08-31: Sale, 9,000 sh ($2.6M)2026-08-31: Sale, 4,000 sh ($1.2M)2026-08-23: Award / grant, 4,770 sh2026-08-23: Award / grant, 7,156 sh2026-08-23: Award / grant, 2,285 sh2026-08-23: Award / grant, 32,600 sh2026-08-23: Award / grant, 4,770 sh2026-08-23: Award / grant, 7,156 sh2026-08-23: Award / grant, 2,285 sh2026-08-23: Award / grant, 32,600 sh2026-08-23: Award / grant, 4,770 sh2026-08-23: Award / grant, 7,156 sh2026-08-23: Award / grant, 2,285 sh2026-08-23: Award / grant, 32,600 sh2026-08-23: Award / grant, 4,770 sh2026-08-23: Award / grant, 2,285 sh2026-08-23: Award / grant, 7,156 sh2026-08-23: Award / grant, 32,600 sh2026-08-21: Withheld for tax, 2,837 sh ($880K)2026-08-21: Withheld for tax, 1,644 sh ($510K)2026-08-21: Withheld for tax, 851 sh ($264K)2026-08-21: Withheld for tax, 817 sh ($253K)2026-08-21: Option exercise, 4,441 sh2026-08-21: Option exercise, 7,208 sh2026-08-21: Option exercise, 2,300 sh2026-08-21: Option exercise, 2,076 sh2026-08-21: Option exercise, 4,441 sh2026-08-21: Option exercise, 7,208 sh2026-08-21: Disposition, 3,393 sh2026-08-21: Option exercise, 2,300 sh2026-08-21: Option exercise, 2,076 sh2026-08-21: Option exercise, 4,441 sh2026-08-21: Option exercise, 7,208 sh2026-08-21: Option exercise, 2,300 sh2026-08-21: Option exercise, 2,076 sh2026-08-21: Option exercise, 7,208 sh2026-08-21: Disposition, 3,393 sh2026-08-21: Option exercise, 2,300 sh2026-08-21: Option exercise, 2,076 sh2026-08-21: Option exercise, 4,441 sh2026-08-21: Option exercise, 7,208 sh2026-08-21: Option exercise, 2,300 sh2026-08-21: Option exercise, 2,076 sh2026-08-21: Option exercise, 4,441 sh2026-08-21: Option exercise, 7,208 sh2026-08-21: Disposition, 3,393 sh2026-08-21: Option exercise, 2,300 sh2026-08-21: Option exercise, 2,076 sh2026-08-21: Option exercise, 2,076 sh2026-08-21: Option exercise, 4,441 sh2026-08-21: Option exercise, 7,208 sh2026-08-21: Option exercise, 2,300 sh2026-08-21: Option exercise, 4,441 sh2026-08-21: Option exercise, 7,208 sh2026-08-21: Disposition, 3,393 sh2026-08-21: Option exercise, 2,300 sh2026-08-21: Option exercise, 2,076 sh2026-08-21: Option exercise, 4,441 sh2026-02-17: Sale, 10,000 sh ($2.6M)2026-02-17: Sale, 5,000 sh ($1.3M)2025-10-15: Sale, 13,000 sh ($3.1M)2025-10-15: Sale, 5,000 sh ($1.2M)2025-09-18: Sale, 11,000 sh ($2.4M)2025-09-03: Other acquisition, 17,397 sh ($0)2025-09-03: Other acquisition, 17,397 sh ($0)2025-08-23: Award / grant, 2,890 sh ($0)2025-08-23: Award / grant, 9,343 sh ($0)2025-08-23: Award / grant, 6,228 sh ($0)2025-08-23: Disposition, 8,127 sh ($0)2025-08-22: Option exercise, 10,627 sh ($2.2M)2025-08-22: Option exercise, 8,803 sh ($1.9M)2025-08-22: Withheld for tax, 3,932 sh ($828K)2025-08-22: Withheld for tax, 3,464 sh ($729K)2025-08-22: Option exercise, 2,299 sh ($484K)2025-08-22: Withheld for tax, 905 sh ($190K)2025-08-22: Option exercise, 2,299 sh ($0)2025-08-22: Option exercise, 10,627 sh ($0)2025-08-22: Option exercise, 8,803 sh ($0)2025-08-13: Sale, 16,000 sh ($3.2M)
WTS · 4 trades
2026-08-03: Award / grant, 456 sh ($0)2026-03-11: Gift, 9,800 sh ($0)2026-03-11: Gift, 9,800 sh ($0)2025-08-05: Award / grant, 516 sh ($0)

Filing ledger

DateCompanyActionShares @ priceValueOwnership ΔOwned afterFiling
2026-08-31SXISale9,000 @ $290.82$2.6M−10.6% of holding75,973Form 4
2026-08-31SXISale4,000 @ $290.81$1.2M−4.5% of holding84,973Form 4
2026-02-17SXISale10,000 @ $255.98$2.6M−9.6% of holding93,973Form 4
2026-02-17SXISale5,000 @ $255.87$1.3M−5.3% of holding88,973Form 4
2025-10-15SXISale13,000 @ $235.00$3.1M−11.1% of holding103,973Form 4
2025-10-15SXISale5,000 @ $235.00$1.2M−4.1% of holding116,973Form 4
2025-09-18SXISale11,000 @ $215.00$2.4M−8.3% of holding121,973Form 4
2025-08-13SXISale16,000 @ $200.00$3.2M−12.2% of holding115,576Form 4
75 award / exercise / gift records — not counted as purchases
DateCompanyActionSharesOwned afterFiling
2026-08-23SXIAward / grant4,7704,770Form 4
2026-08-23SXIAward / grant7,1567,156Form 4
2026-08-23SXIAward / grant2,2852,285Form 4
2026-08-23SXIAward / grant32,60032,600Form 4
2026-08-23SXIAward / grant4,7704,770Form 4
2026-08-23SXIAward / grant7,1567,156Form 4
2026-08-23SXIAward / grant2,2852,285Form 4
2026-08-23SXIAward / grant32,60032,600Form 4
2026-08-23SXIAward / grant4,7704,770Form 4
2026-08-23SXIAward / grant7,1567,156Form 4
2026-08-23SXIAward / grant2,2852,285Form 4
2026-08-23SXIAward / grant32,60032,600Form 4
2026-08-23SXIAward / grant4,7704,770Form 4
2026-08-23SXIAward / grant2,2852,285Form 4
2026-08-23SXIAward / grant7,1567,156Form 4
2026-08-23SXIAward / grant32,60032,600Form 4
2026-08-21SXIWithheld for tax2,8378,598Form 4
2026-08-21SXIWithheld for tax1,6444,227Form 4
2026-08-21SXIWithheld for tax85110,047Form 4
2026-08-21SXIWithheld for tax81711,306Form 4
2026-08-21SXIOption exercise4,4410Form 4
2026-08-21SXIOption exercise7,20811,435Form 4
2026-08-21SXIOption exercise2,30010,898Form 4
2026-08-21SXIOption exercise2,07612,123Form 4
2026-08-21SXIOption exercise4,4410Form 4
2026-08-21SXIOption exercise7,2083,393Form 4
2026-08-21SXIDisposition3,3930Form 4
2026-08-21SXIOption exercise2,3002,300Form 4
2026-08-21SXIOption exercise2,0764,152Form 4
2026-08-21SXIOption exercise4,4415,871Form 4
2026-08-21SXIOption exercise7,20811,435Form 4
2026-08-21SXIOption exercise2,30010,898Form 4
2026-08-21SXIOption exercise2,07612,123Form 4
2026-08-21SXIOption exercise7,2083,393Form 4
2026-08-21SXIDisposition3,3930Form 4
2026-08-21SXIOption exercise2,3002,300Form 4
2026-08-21SXIOption exercise2,0764,152Form 4
2026-08-21SXIOption exercise4,4415,871Form 4
2026-08-21SXIOption exercise7,20811,435Form 4
2026-08-21SXIOption exercise2,30010,898Form 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.