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Margaret Montemayor

CIK 1602114 · SVP, Chief Accounting Officer · last filed 2026-06-04

Margaret Montemayor is a SVP, Chief Accounting Officer who has filed 47 SEC Form 4 insider transactions across 3 companies since 2014. The most recent filing shows the insider sold $736.0K of VST on Jun 4, 2026. Across all open-market trades the lifetime net is −$4.6M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $1.4M 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

$1.37M

Companies

3

Total Filings

47

Lifetime Open-Market Net

-$4.61M

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
VST SVP, Chief Accounting Officer 9,760 $140.52 $1.37M -$1.56M 7 2026-06-04
Vistra Corp. (VST.WS.A) Delisted SVP, Chief Accounting Officer 14,534 $0.01 $113 $0 1 2023-11-16
PIONEER NATURAL RESOURCES CO (PXD) Delisted VP & CAO 5,012 $269.62 $1.35M -$3.05M 37 2022-03-31

Recent Filings

47 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
2026-06-04 VST Sell (S) −4,600 -$736.0K EDGAR
2026-06-02 VST Notice (144) −4,600 -$736.0K EDGAR
2026-05-29 VST Sell (S) −5,000 -$824.8K EDGAR
2026-05-27 VST Notice (144) −5,000 -$824.8K EDGAR
2026-03-09 VST Mixed +1,428 -$93.9K EDGAR
2025-11-17 VST Tax (F) −1,472 -$252.5K EDGAR
2025-03-07 VST Mixed +1,746 -$50.0K EDGAR
2024-11-15 VST Tax (F) −1,177 -$167.3K EDGAR
2024-03-07 VST Grant (A) +4,334 $0 EDGAR
2023-11-16 Vistra Corp. (VST.WS.A) Delisted Grant (A) +14,534 $0 EDGAR
Showing 1–10 of 47
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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.