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Ronald B Stark

CIK 1329875 · EVP and CAO · last filed 2026-08-21

Ronald B Stark is an EVP and CAO who has filed 31 SEC Form 4 insider transactions across 4 companies since 2013. The most recent filing, for MWH, was dated Aug 21, 2026. Current disclosed insider exposure totals $2.8M across reported positions. 14 SEC filings were submitted jointly with NRG ENERGY, INC.

"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

$2.83M

Companies

4

Total Filings

31

Lifetime Open-Market Net

$0

Filer Profile

Reported Address
C/O NRG ENERGY, INC.
211 CARNEGIE CENTER
PRINCETON, NJ 08540
Related Filers
NRG ENERGY, INC. — 14 joint filings, latest 2015-02-04
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
MWH EVP and CAO — $25.27 — $0 3 2026-08-21
Arcadium Lithium plc (ALTM) Delisted Chief Accounting Officer 0 $5.84 $0 $0 9 2025-03-06
Livent Corp. (LTHM) Delisted Chief Accounting Officer 12,581 $16.51 $207.7K $0 6 2023-12-27
NRG VP, Chief Accounting Officer 23,765 $119.02 $2.83M $0 12 2015-02-04

Recent Filings

31 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
2026-08-21 MWH Sell (S) — $0 EDGAR
2026-06-05 MWH Disp (D) — $0 EDGAR
2026-06-03 MWH Disp (D) — $0 EDGAR
2025-03-06 Arcadium Lithium plc (ALTM) Delisted Disp (D) −84,645 $0 EDGAR
2025-03-03 Arcadium Lithium plc (ALTM) Delisted Tax (F) −2,745 -$16.0K EDGAR
2025-02-26 Arcadium Lithium plc (ALTM) Delisted Tax (F) −710 -$4.1K EDGAR
2025-02-14 Arcadium Lithium plc (ALTM) Delisted Grant (A) +38,861 $0 EDGAR
2024-03-08 Arcadium Lithium plc (ALTM) Delisted Grant (A) +22,728 $0 EDGAR
2024-02-26 Arcadium Lithium plc (ALTM) Delisted Tax (F) −137 -$643 EDGAR
2024-02-01 Arcadium Lithium plc (ALTM) Delisted Tax (F) −4,674 -$31.8K EDGAR
Showing 1–10 of 31
Page 1 of 4
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.