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RONALD C FOSTER

CIK 1222896 · CFO & VP OF FINANCE · last filed 2026-05-08

RONALD C FOSTER is a CFO & VP OF FINANCE who has filed 111 SEC Form 4 insider transactions across 4 companies since 2007. The most recent filing, for AEISE, was dated May 8, 2026. Across all open-market trades the lifetime net is −$30.2M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $591.9M 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

$591.92M

Companies

4

Total Filings

111

Lifetime Open-Market Net

-$30.21M

Filer Profile

Reported Address
C/O ADVANCED ENERGY INDUSTRIES, INC.
1595 WYNKOOP STREET, SUITE 800
DENVER, CO 80202
Profile details as reported on the filer's SEC submissions — for individual insiders the address is often in care of the issuer. Related filers are identified from jointly filed SEC submissions and shared reported addresses. View filings on SEC EDGAR.

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
AEISE Director 25,088 — — -$1.12M 24 2026-05-08
MRAM Director 32,586 $16.37 $533.4K $0 4 2020-05-20
MU CFO & VP OF FINANCE 581,442 $1016.59 $591.09M -$28.39M 66 2015-02-19
FORM Sr. VP & CFO 2,883 $103.90 $299.5K -$702.9K 7 2007-06-18

Recent Filings

111 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
2026-05-08 AEISE Grant (A) — $0 EDGAR
2026-05-05 AEISE Exer (M) +2,313 $0 EDGAR
2025-05-06 AEISE Mixed +2,093 $0 EDGAR
2024-05-07 AEISE Mixed +2,257 $0 EDGAR
2023-12-14 AEISE Sell (S) −618 -$64.9K EDGAR
2023-12-13 AEIS Notice (144) −618 -$64.9K EDGAR
2023-12-04 AEISE Sell (S) −1,000 -$95.0K EDGAR
2023-12-01 AEIS Notice (144) −1,000 -$95.0K EDGAR
2023-11-16 AEISE Sell (S) −1,000 -$95.0K EDGAR
2023-11-15 AEIS Notice (144) −1,000 -$95.0K EDGAR
Showing 1–10 of 111
Page 1 of 12
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.