Private company
Who owns Next Securities Corporation
One company in the researched set discloses a stake in Next Securities Corporation, none of it sized by anyone who discloses it. Next Securities Corporation is private, so no 13F reports it: a 13F covers exchange listed positions only. These figures exist because each holder disclosed the stake in its own filings.
Next Securities Corporation - Profile
- Type
- private company
- Based in
- South Korea
- Founded
- 1997
Next Securities is a South Korean securities firm that traces its roots to Hyundai Futures, founded in 1997, passed through several owners and names, and took its current name in December 2024 after trading as SI Securities. Under Kim Seung Yeon, the former chief executive of Toss Securities who joined in 2025, it is rebuilding itself around artificial intelligence, global expansion and platform design, and is preparing a mobile trading system organised around short form content that pairs personalised market content and social features with AI assisted order placement. The firm employs about 180 people, roughly a quarter of them developers, has set up Next Markets Asia Pte. Ltd. in Singapore as an engineering hub, and signed an agreement with Siebert Financial in October 2025 to take its technology into the United States.
Source
Next Securities Corporation files nothing with the SEC, so none of this comes from a filer record. The description was written for this site in August 2026 from Interactive Brokers APAC head joins board of Korea's Next Securities (The Korea Herald), Next Securities overhauls AI organization ahead of MTS launch (Seoul Economic Daily) and Next Securities (company website). The ownership figures below come from the holders' filings instead, and are sourced row by row.
The disclosed stakes
One row per position. Where a holder reports the same company in two share classes, both rows are shown rather than summed, because the class is part of a position's identity.
Where each figure comes from
A private stake has no ownership form behind it, so the source is always the holder's own filing or disclosure. Anything modelled says so, with the arithmetic.
- Interactive Brokers Group, Inc.. IBKR's 10-Q (period 30 Jun 2026) names Next Securities Corporation, a South Korea-based securities company, as a strategic business investment, part of the same undisclosed combined $234m investments bucket described on the BOX Options Exchange row. No individual size disclosed. source
What this page is not
It is not a complete register. It lists the holders who happen to be inside the researched set and disclosed the stake themselves. A private company can have many other shareholders, and nothing here rules them out: venture investors, founders and employees usually appear in no public filing at all. Percentages are of Next Securities Corporation where a holder stated one, and are missing where no holder did.