AI assistants most often recommend auカブコム証券 for stock trading apps in 🇯🇵 Japan (日本語), naming it in 83% of the buyer questions we tested, followed by Rakuten Securities and SBI Securities. We asked an AI model the questions buyers ask about stock trading apps and tallied which brands it named most — "share of voice" in AI answers, who AI recommends when no human is watching.
| # | Brand | AI share of voice |
|---|---|---|
| 1 | auカブコム証券 | 5/6 (83%) |
| 2 | Rakuten Securities | 4/6 (67%) |
| 3 | SBI Securities | 2/6 (33%) |
| 4 | SBI証券 | 2/6 (33%) |
| 5 | Yahoo!ファイナンス | 2/6 (33%) |
| 6 | Marcus | 2/6 (33%) |
| 7 | 楽天証券 | 1/6 (17%) |
| 8 | RakuRaku Cabinet | 1/6 (17%) |
| 9 | MATSUMOTOSECURITY | 1/6 (17%) |
| 10 | 松井証券 | 1/6 (17%) |
| 11 | Rakuten FX | 1/6 (17%) |
| 12 | SBI FXトレード | 1/6 (17%) |
| 13 | auカブコムFX | 1/6 (17%) |
| 14 | LINE証券 | 1/6 (17%) |
Method: 6 representative buyer questions via a large language model, 🇯🇵 Japan (日本語). Updated 10/18/2026. A proxy for how AI assistants describe this category.
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