EP. 238 - GEORGIA: 1999 ATLANTA DAY TRADING MASSACRE: MARK ORRIN BARTON
March 20, 2026
AI Summary
5 min readOn July 29, 1999, after bludgeoning his second wife Leanne Barton and their children, 11-year-old Matthew and 8-year-old Michelle, Mark Barton drove his green minivan from their Stockbridge apartment to Atlanta's Piedmont Center. There, amid the high-stakes world of day trading firms fueled by the dot-com boom, he unleashed one of Georgia's deadliest mass shootings, killing nine people at Momentum Securities and All-Tech Investment Group before taking his own life hours later.
Entry and Shooting at Momentum Securities
Barton, 44, arrived around 2:30 p.m., dressed in a pink shirt and slacks, smiling and chatting casually. Traders knew him as a former colleague whose accounts had been closed due to massive losses—over $450,000 across firms. He lit a cigarette for trader Rick Penley outside, joking about a "bloodbath," then entered, asking receptionist Marcy Bookings about wiring $200,000 to resume trading with manager Justin Hohen, whom he owed $18,500.
Continue reading the full summary in the app — free to try.
Read Full Summary →Free • No credit card required
Never miss an episode of Murder In America
Get every new episode summarized in your inbox — free, ~5 minutes to read.
No spam. Unsubscribe anytime.
What you'll learn
- 1 (02:29) **Part 1 Recap & Episode Setup** - Hosts summarize Mark Barton's troubled past, family murders, and lead-in to the July 29, 1999, day trading office shootings
- 2 (05:17) **Day Trading Boom Context** - Explains 1999 Wall Street hype, Buckhead firms All-Tech and Momentum as high-stakes casinos for amateurs
- 3 (07:34) **Morning at Trading Firms** - Normal trading day begins around 9 AM despite market slump; no one suspects horror from apartment murders 25 miles away
- 4 (10:10) **Arrival at Momentum Securities** - Barton parks, chats casually with smoker Rick Penley ("bloodbath" quip misinterpreted), enters smiling
- 5 (14:00) **First Shots: Kevin Dial Killed** - Barton shoots co-manager Kevin Dial in coffee room with dual pistols after ominous warning
- 6 (18:01) **Momentum Massacre Unfolds** - Barton methodically shoots down aisles; survivors like Andrew Zabrazala play dead, Glenn/Joe barricade door
- 7 (32:07) **Barton Leaves Momentum** - Calmly exits past security into 100°F heat, bloodied but unnoticed, crosses to All-Tech
+ Full timestamped outline available in the app
Show Notes
Two offices. Thirteen people bleeding out on their workplace floor. And humid air full of the smell of iron, smoke, and gunfire. That’s exactly what Mark Orrin Barton wanted on the afternoon of July 29th, 1999 – and it’s just what he got. In part two of this series, we’ll walk you through the tragic, chaotic massacre that Mark Barton unleashed at his former offices. We’ll look at the victims, the survivors, and lastly – the shocking end to Mark’s rampage, which concluded with two final gunshots that no one saw coming.
-
Listen to our new show, "THE CONSPIRACY FILES"!:
-Spotify - https://open.spotify.com/show/5IY9nWD2MYDzlSYP48nRPl
-Apple Podcasts - https://podcasts.apple.com/us/podcast/the-conspiracy-files/id1752719844
-Amazon/Audible - https://music.amazon.com/podcasts/ab1ade99-740c-46ae-8028-b2cf41eabf58/the-conspiracy-files
-Pandora - https://www.pandora.com/podcast/the-conspiracy-files/PC:1001089101
-iHeart - https://iheart.com/podcast/186907423/
-PocketCast - https://pca.st/dpdyrcca
-CastBox - https://castbox.fm/channel/id6193084?country=us
-
Stay Connected:
Join the Murder in America fam in our free Facebook Community for a behind-the-scenes look, more insights and current events in the true crime world: https://www.facebook.com/groups/4365229996855701
If you want even more Murder in America bonus content, including ad-free episodes, come join us on Patreon: https://www.patreon.com/murderinamerica
Instagram: http://instagram.com/murderinamerica/
Fac
More from this podcast
Murder In America →