Insider transactions

Ronald C Foster

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

"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
$537.58M
Companies
4
Total Filings
111
Lifetime Open-Market Net
-$30.21M

Charts

Trading activity, where the exposure sits, and each trade against the stock price.

MU price and trades

Daily close with each Form 4 filing on this company marked: green = open-market buy, red = open-market sale, purple = grants, exercises, gifts and other non-market transactions. Marker size scales with the dollar value.

Shares held

Shares owned after each reported transaction on this company (direct holdings as reported).

Open-market buying and selling

by month

Dollar value of open-market purchases (code P, up) and sales (code S, down) across all companies, by filing month. Grants, exercises and gifts are excluded.

Exposure by company

latest
OfficerDirector10% owner* stale (no filing in 3 yrs)

Most recently reported shares × current price. Faded bars (*) have had no filing in 3 years, so the person may no longer hold them. Click a bar to chart that company.

Filer Profile

Reported Address
C/O ADVANCED ENERGY INDUSTRIES, INC.
1595 WYNKOOP STREET, SUITE 800
DENVER, CO 80202
Related Filers
VIAVI SOLUTIONS INC. — 4 joint filings, latest 2005-02-01
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 $13.35 $435.0K $0 4 2020-05-20
MU CFO & VP OF FINANCE 581,442 $923.30 $536.85M -$28.39M 66 2015-02-19
FORM Sr. VP & CFO 2,883 $105.00 $302.7K -$702.9K 7 2007-06-18

Recent Filings · Page 4 of 12

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
2019-06-06 AEISE Grant (A) +3,500 $181.5K EDGAR
2019-05-22 MRAM Grant (A) +7,000 $0 EDGAR
2018-05-22 MRAM Grant (A) +3,000 $0 EDGAR
2018-05-07 AEISE Grant (A) +6,000 $368.9K EDGAR
2017-05-08 AEISE Grant (A) +6,000 $445.7K EDGAR
2016-12-20 MRAM Mixed — $0 EDGAR
2016-05-06 AEISE Grant (A) +8,000 $276.4K EDGAR
2015-05-11 AEISE Grant (A) +8,000 $199.7K EDGAR
2015-02-19 MU Mixed — -$2.71M EDGAR
2014-12-10 MU Mixed — -$558.4K EDGAR
Showing 31–40 of 111
Page 4 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.