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Mark Lowell Keim

CIK 1690677 · Chief Financial Officer · last filed 2026-03-02

Mark Lowell Keim is a Chief Financial Officer who has filed 19 SEC Form 4 insider transactions across 2 companies since 2016. The most recent filing, for MOH, was dated Mar 2, 2026. Across all open-market trades the lifetime net is −$10.3M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $16.7M 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

$16.72M

Companies

2

Total Filings

19

Lifetime Open-Market Net

-$10.29M

Filer Profile

Reported Address
440 LINCOLN STREET
E-6
WORCESTER, MA 01653
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
MOH Chief Financial Officer 83,251 $200.80 $16.72M -$9.76M 15 2026-03-02
HANOVER INSURANCE GROUP, INC. (THGA) Delisted Executive Vice President 0 — — -$535.3K 3 2017-11-30

Recent Filings

19 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
2026-03-02 MOH Mixed +23,765 $3.44M EDGAR
2025-03-04 MOH Mixed +11,892 $3.47M EDGAR
2024-03-05 MOH Mixed +11,063 $4.28M EDGAR
2024-02-14 MOH Sell (S) −15,000 -$5.80M EDGAR
2024-02-12 MOH Notice (144) −15,000 -$5.55M EDGAR
2023-03-03 MOH Mixed +16,616 $4.53M EDGAR
2022-08-11 MOH Sell (S) −12,000 -$3.96M EDGAR
2022-03-03 MOH Mixed +11,947 $3.73M EDGAR
2022-01-11 MOH Tax (F) −1,325 -$383.9K EDGAR
2021-03-05 MOH Mixed +10,781 $2.40M EDGAR
Showing 1–10 of 19
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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.