KOS Margin Call: Kosy Chairman's Family Forced to Sell 4 Million Shares

Overview

Five securities firms issued forced-sale notices on nearly 4 million KOS shares held by family members and related parties of Kosy Chairman Nguyen Viet Cuong, according to Vietnamese market filings reported by Vietnam Finance Daily. The margin calls followed five consecutive floor-price sessions that cut KOS from VND 30,050 to VND 21,000, a decline of more than 30% that removed about VND 1,960 billion from Kosy’s market capitalization in one week. The episode puts insider leverage and share pledging at a HOSE-listed real estate developer back in focus for institutional investors.

Key Facts

• Chairman Nguyen Viet Cuong was margin-called on 521,200 KOS shares across three brokers: KIS (285,000), PBSV (130,400) and Nhat Viet (105,800).
• Vice Chairwoman Nguyen Thi Hang, the Chairman’s wife, faced forced sales of 441,600 shares via Capital, Finhay and PBSV.
• Nguyen Trung Kien, the Chairman’s younger brother, was margin-called on 353,600 shares by Nhat Viet.
• Leo Regulus Investment JSC, a related entity led by Chairman Cuong and holder of more than 10% of Kosy, was forced to sell 1,811,200 shares across four securities firms, the largest single block.
• Deputy General Director Nguyen Thi Phuong Thao, the Chairman’s sister, was margin-called on 670,900 shares.
• KOS fell from VND 30,050 to VND 21,000 over five floor sessions, a drop of more than 30%, leaving market capitalization near VND 4,546 billion.
• Kosy reported H1 2026 revenue of VND 723 billion, up 9% year on year, and after-tax profit of about VND 15 billion, more than double the roughly VND 7 billion booked in H1 2025.

What Happened

The forced sales were disclosed through a series of broker notices covering insider and related-party accounts at Kosy, the HOSE-listed real estate developer. Chairman Nguyen Viet Cuong was the subject of three separate margin calls totaling 521,200 shares, while his wife, Vice Chairwoman Nguyen Thi Hang, was named in notices from Capital, Finhay and PBSV covering 441,600 shares. His brother Nguyen Trung Kien and sister Nguyen Thi Phuong Thao, the Deputy General Director, were margin-called on 353,600 and 670,900 shares respectively.

The largest block belonged to Leo Regulus Investment JSC, an entity chaired by Nguyen Viet Cuong that holds more than 10% of Kosy. Four securities firms moved to sell 1,811,200 Leo Regulus shares. The notices were triggered by the sharp decline in KOS, which hit the floor price for five straight sessions and fell from VND 30,050 to VND 21,000. The company’s own explanation for recent revenue growth cited real estate revenue recognition from projects opened for sale during the period.

Market Context

KOS trades on HOSE and closed at VND 22,550 on 24 September 2026, above the VND 21,000 trough cited in the margin-call coverage but still well below the pre-decline level of VND 30,050. The stock sits in the real estate sector, where leverage at the controlling-shareholder level has become a recurring risk theme as several developers face refinancing pressure. The scale of the forced selling, nearly 4 million shares across five brokers, is large relative to the roughly VND 4,546 billion market capitalization, and the concentration of margin calls within one family group amplifies the signal for minority holders.

Strategic Significance

The core issue for long-term investors is not the H1 2026 earnings result, which showed revenue up 9% and profit more than doubling, but the financing structure behind the controlling stake. Margin lending against a concentrated insider position turns a price decline into a mechanical selling event, and the cascade of notices from five separate brokers suggests the family’s exposure was spread across multiple lenders with limited coordination. Leo Regulus holding more than 10% of Kosy while carrying margin debt means any further price weakness can trigger additional forced sales, creating a feedback loop that is independent of the company’s project pipeline or revenue recognition schedule.

What to Watch

• Further forced-sale notices from securities firms covering the same insider accounts, which would indicate residual margin exposure.
• Kosy’s next financial disclosure for Q3 2026, particularly real estate revenue recognition and any change in the profit trajectory from the VND 15 billion H1 result.
• Any filing on Leo Regulus’s ownership percentage, since a drop below 10% would change the shareholder-disclosure regime.
• Trading volume and floor-price behavior in KOS around the VND 21,000 level, which is the reference point for the completed forced sales.
• Disclosure of whether the Chairman or related parties pledge additional KOS shares as collateral for new or restructured loans.