WALSH COLIN

ATTO

WALSH COLIN serves as director at ATTO (ATTO). This page tracks their complete SEC Form 4 insider trading history including stock purchases and sales.

Total Buys

1 trades

$10.29M

Total Sells

1 trades

$2.24M

Net Position

Net Buyer

$8.04M

Companies Traded

ATTO

Active Period

Aug 2026

2 total trades

Most Recent

Buy ATTO

Aug 13, 2026 · $10.29M

WALSH COLIN's Insider Trading at ATTO (ATTO)

Buys

1 · $10.29M

Sells

1 · $2.24M

Total Shares Bought

585,000

Total Shares Sold

105,307

ATTO Price Chart

Loading chart...

Date	Type	Shares	Avg Price	Value	Shares After
Aug 13, 2026	Buy	585,000	$17.58	$10.29M	3,020,632
Aug 13, 2026	Sell	105,307	$21.28	$2.24M	84,012

Related Insiders

GOLDMAN SACHS GROUP INC

other: Former 10% Owner

ATTOSell · Aug 13, 2026

venBio Global Strategic Fund IV, L.P.

10 percent owner

ATTOBuy · Aug 10, 2026

Redmile Group, LLC

10 percent owner

ATTOBuy · Aug 7, 2026

Sanofi

10 percent owner

ATTOBuy · Aug 7, 2026

Frazier Life Sciences XI, L.P.

10 percent owner

ATTOBuy · Aug 6, 2026

Explore More Insider Trading Data

ATTO Insider Trading Activity

View all insider trades at ATTO

Latest Insider Buys

Most recent insider purchases across all stocks

CEO Stock Purchases

Track CEO buying activity