Insiders / O'Sullivan Michael J.

O'Sullivan Michael J.

CIK 1713777personinsider
Companies
1
First seen
May 5, 2026
Last activity
May 6, 2026

Companies

1View all →
CompanyRoleShares heldPeak heldTradesLatest
Warren E. Buffett · BRK.AExecutive6636632—

All securities held

1 position · latest reported per filing
CompanySecuritySharesAs of
Warren E. BuffettClass B Common Stock663May 6, 2026

Activity

View all →
InsidersInstitutions
This person's insider trades (Form 4), across every company.
DateActionCompanyValueShares ΔPosition afterImpact
May 6, 2026BuyBRK.A
Warren E. Buffett
Class B Common Stock
$225.6K+483
+380.31%
610
<0.01% of shares
medium
May 6, 2026BuyBRK.A
Warren E. Buffett
Class B Common Stock
$24.9K+53
+8.69%
663
<0.01% of shares
low