Mark Mason

CIK 1487290 · Chief Financial Officer · last filed 2026-09-11

Mark Mason is a Chief Financial Officer who has filed 54 SEC Form 4 insider transactions across 3 companies since 2010. The most recent filing, for MSFT, was dated Sep 11, 2026. Across all open-market trades the lifetime net is −$785.0M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $32.2M across reported positions. 12 SEC filings were submitted jointly with MICROSOFT CORP.

"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.

Disclosed Exposure

$32.18M

Companies

Total Filings

Lifetime Open-Market Net

-$784.99M

Charts

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

Filer Profile

Reported Address

388 GREENWICH STREET
NEW YORK, NY 10013

Related Filers

MICROSOFT CORP — 12 joint filings, latest 2026-06-12

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
MSFT	Director	1,675	$517.53	$866.9K	$0	13	2026-09-11
C	Chief Financial Officer	234,137	$128.50	$30.09M	-$6.42M	18	2026-02-24
PRI	Director	4,456	$275.42	$1.23M	-$778.57M	21	2019-03-18

Recent Filings

54 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
2026-09-11	MSFT	Grant (A)	—	$0	EDGAR
2026-09-08	MSFT	Grant (A)	—	$0	EDGAR
2026-06-12	MSFT	Grant (A)	—	$0	EDGAR
2026-06-09	MSFT	Grant (A)	—	$0	EDGAR
2026-02-24	C	Mixed	−3,627	-$416.0K	EDGAR
2026-02-20	C	Notice (144)	−3,627	-$416.0K	EDGAR
2026-02-13	C	Grant (A)	+52,367	$0	EDGAR
2026-02-03	MSFT	Grant (A)	+145	$0	EDGAR
2026-01-20	C	Tax (F)	−29,209	-$3.45M	EDGAR
2025-12-05	MSFT	Grant (A)	+130	$0	EDGAR

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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.