Cathay United Bank Co. Chairman Kuo Ming-jian stepped down after regulators flagged a breach at the lender’s asset‑management affiliate. The violation stemmed from Kuo’s external positions, which regulators said conflicted with the bank’s compliance rules. His resignation follows a rare physical altercation with a member of Taiwan’s billionaire Tsai family, amid mounting shareholder pressure.

The dispute centers on how Kuo’s outside holdings intersected with the affiliate’s investment decisions, a breach that could expose the bank to sanctions or capital penalties. Investors have watched the episode closely, fearing that governance lapses might erode confidence in a lender that serves a sizable overseas Chinese clientele and holds significant market share in Taiwan’s banking sector.

Regulators are expected to review the case and may impose remedial actions, a development that could affect the bank’s share price and its ability to raise new capital. Kuo’s exit also signals a shift in the power balance among Taiwan’s elite families, whose influence has long shaped corporate boards. The episode underscores the need for stricter conflict‑of‑interest controls in the region’s financial institutions.