Japan's First! US Stock Margin Trading Now Available via API

Webull Securities Co., Ltd. (Location: Chuo-ku, Tokyo; Representative Director: Kazu Kojima), the Japanese base of leading digital investment platform Webull Corporation (NASDAQ: BULL) in the United States, is pleased to announce the launch of a new US stock margin trading function within its "Webull Open API" service. Previously, only spot trading for US and Japanese stocks was supported via API. With this new feature, US stock margin trading is now possible. According to our research (as of March 2026), Webull Securities is the first among major domestic online brokerages (SBI Securities, Rakuten Securities, Monex Securities, Matsui Securities, Mitsubishi UFJ e Smart Securities) to offer US stock margin trading via API in Japan. By providing this function, investors and developers will be able to build a more advanced and flexible US stock trading environment. ## Expanding Possibilities for US Stock Trading with Webull Open API Webull Open API is an API service that allows users to utilize stock trading functions from environments other than the Webull app. In addition to the previously offered spot trading for US and Japanese stocks, the new support for US stock margin trading enables a wider range of investment strategies, such as leverage trading and short selling, to be executed via API. This provides an environment that meets the diverse needs of investors, including algorithmic trading, automated trading, and trading with proprietary tools. **** - Japan's first! Supports US stock margin trading via API - US stock margin trading possible from environments other than the Webull app - Supports diverse investment strategies, including leverage trading and short selling, in addition to spot trading Furthermore, the interest rates for US stock margin trading offered by our company are as follows, with stock lending fees (annual interest rate) being among the lowest in the industry (*1). **Trading Type | Buying Interest Rate (Annual) | Stock Lending Fee (Annual)** (Table content truncated in original)