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NICHOLAS M GRINDSTAFF

CIK 1134710 · Chief Financial Officer (CFO) · last filed 2026-07-14

NICHOLAS M GRINDSTAFF is a Chief Financial Officer (CFO) who has filed 44 SEC Form 4 insider transactions across 3 companies since 2007. The most recent filing shows the insider had shares withheld for taxes covering $379.4K of STRL on Jul 14, 2026. Across all open-market trades the lifetime net is −$2.9M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $25.4M across reported positions.

"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.

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Disclosed Exposure

$25.37M

Companies

3

Total Filings

44

Lifetime Open-Market Net

-$2.93M

Holdings By Company

Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
Symbol Role Shares Price Disclosed Exposure Lifetime OM Net Filings Latest Filed
STRL Chief Financial Officer (CFO) 6,037 $611.47 $3.69M $0 3 2026-07-14
Orbital Infrastructure Group, Inc. (OIG) Delisted Chief Financial Officer 7,401 $0.38 $2.8K $0 1 2022-10-17
PWR VP - Finance and Treasurer 31,868 $680.20 $21.68M -$2.93M 40 2021-05-12

Recent Filings

44 filings
Insider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
Filed Symbol Action Net Shares Net $ Link
2026-07-14 STRL Tax (F) −556 -$379.4K EDGAR
2026-01-05 STRL Mixed +968 -$18.7K EDGAR
2025-07-10 STRL Grant (A) +5,560 $0 EDGAR
2022-10-17 Orbital Infrastructure Group, Inc. (OIG) Delisted Grant (A) +154,106 $0 EDGAR
2021-05-12 PWR Sell (S) −8,454 -$855.7K EDGAR
2021-03-29 PWR Mixed +909 -$41.0K EDGAR
2021-03-05 PWR Mixed +3,646 -$179.0K EDGAR
2021-03-02 PWR Tax (F) −399 -$33.5K EDGAR
2021-01-05 PWR Tax (F) −2,624 -$189.0K EDGAR
2020-11-04 PWR Sell (S) −8,256 -$532.8K EDGAR
Showing 1–10 of 44
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Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.