MARTIN J MANNION

CIK 1018067 · last filed 2022-09-09

MARTIN J MANNION is a corporate insider who has filed 8 SEC Form 4 insider transactions across 5 companies since 2007. The most recent filing shows the insider disposed of $446.2M of ATEN on Sep 9, 2022. Across all open-market trades the lifetime net is −$2.88B, making them a net seller over the disclosed history. Current disclosed insider exposure totals $1.00B across reported positions. 38 SEC filings were submitted jointly with BRUCE R EVANS.

"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

$1.00B

Companies

5

Total Filings

8

Lifetime Open-Market Net

-$2.88B

Filer Profile

Reported Address

C/O SUMMIT PARTNERS
222 BERKELEY STREET, 18TH FLOOR
BOSTON, MA 02116

Related Filers

BRUCE R EVANS — 38 joint filings, latest 2013-09-13

SUMMIT PARTNERS L P — 38 joint filings, latest 2022-09-09

Summit Investors Management, LLC — 34 joint filings, latest 2022-09-09

WALTER G KORTSCHAK — 26 joint filings, latest 2006-03-10

Summit Partners PE VII, L.P. — 25 joint filings, latest 2016-02-01

Summit Partners PE VII, LLC — 25 joint filings, latest 2016-02-01

GREGORY M AVIS — 23 joint filings, latest 2006-03-10

PETER Y CHUNG — 16 joint filings, latest 2021-09-23

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
ATEN		5,388,206	$26.02	$140.20M	$0	1	2022-09-09
Casa Systems Inc (CASA) Delisted	10%+ Owner	38,592,000	$0.04	$1.35M	$6.50M	1	2017-12-19
MTSI		3,515,938	$245.57	$863.41M	-$1.00B	3	2016-02-01
CORPAY, INC. (FLT) Delisted		4,132,156	$303.26	$1.25B	-$1.89B	1	2013-09-12
AMERICAN DENTAL PARTNERS INC (ADPI) Delisted	Director	1,500	—	—	-$124.0K	2	2008-05-05

Recent Filings

8 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
2022-09-09	ATEN	Disp (D)	−35,000,000	-$446.25M	EDGAR
2017-12-19	Casa Systems Inc (CASA) Delisted	Mixed	+77,684,000	$6.50M	EDGAR
2016-02-01	MTSI	Sell (S)	−16,200,000	-$610.74M	EDGAR
2015-06-02	MTSI	Sell (S)	−207,390	-$7.95M	EDGAR
2015-02-11	MTSI	Sell (S)	−13,410,000	-$383.19M	EDGAR
2013-09-12	CORPAY, INC. (FLT) Delisted	Sell (S)	−18,000,000	-$1.89B	EDGAR
2008-05-05	AMERICAN DENTAL PARTNERS INC (ADPI) Delisted	Mixed	−1,500	-$50.4K	EDGAR
2007-02-28	AMERICAN DENTAL PARTNERS INC (ADPI) Delisted	Grant (A)	—	$0	EDGAR

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.