Assenagon Asset Management S.A. 13F: Adds $602M to BRK.B Stake

Assenagon Asset Management S.A. raised its investment in BRK.B by lifting its share count 36.1%, according to a Form 13F filed with the SEC on October 15, 2026. This report covers institutional holdings at the end of the reporting quarter and does not necessarily reflect the firm's current trading activity today.

What Changed in Assenagon Asset Management S.A.'s BRK.B Position

The fund added 1,209,896 shares to its portfolio during the period, bringing its total ownership to 4,558,653 shares. The reported value of the stake stood at $2,269,981,261. Before this adjustment, the firm held 3,348,757 shares. This follows other recent portfolio moves by the asset manager, which also adjusted positions in companies like Vertex Pharmaceuticals and O'Reilly Automotive during the same filing window.

BRK.B Stock Snapshot

Shares of BRK.B recently traded around $531.89 as of October 16, 2026. Institutional reports like Form 13F look backward at past quarters, meaning these snapshot values and share counts capture positioning from earlier weeks rather than real-time trading.

About BRK.B

BRK.B operates as a major holding company with diverse subsidiaries spanning insurance, freight rail transportation, energy utilities, manufacturing, and retail. Institutional interest from large asset managers often centers on the company's steady cash generation and diversified asset base across the broader economy.

Bottom Line

Assenagon Asset Management's increased position shows a larger commitment to the holding company's stock during the reported period. Because 13F filings are historical records submitted to regulators after the quarter closes, observers should look to upcoming financial reports and future SEC disclosures to track how the fund manages its holdings over time. Keep in mind that 13F filings are backward-looking: they show holdings as of the end of the reporting quarter and may not represent the fund's current position.