# ROUNDHILL ETF TRUST (MSTW)

> Institutional ownership reported to the SEC as of Q2 2026, from Form 13F filings. Source: https://holderbook.com/stocks/MSTW/

- Reporting holders: 7
- Reported value: $977.8K
- Held through calls: 0.0%
- Held through puts: 13.6%

A 13F reports long US equity positions only. Shorts, bonds, foreign listings and cash are not visible here, and positions are disclosed up to 45 days after the quarter ends.

## Largest holders

| Manager | Value | Shares | Share of their book | Quarters held |
|---|---|---|---|---|
| [JANE STREET GROUP, LLC](https://holderbook.com/funds/1595888-jane-street-group-llc/) | $583.9K | 172,698 | 0.0% | 1 |
| [CITADEL ADVISORS LLC](https://holderbook.com/funds/1423053-citadel-advisors-llc/) | $290.4K | 61,010 | 0.0% | 4 |
| [OLD MISSION CAPITAL LLC](https://holderbook.com/funds/1455915-old-mission-capital-llc/) | $45.4K | 14,329 | 0.0% | 1 |
| [HRT FINANCIAL LP](https://holderbook.com/funds/1475597-hrt-financial-lp/) | $36.0K | 11,513 | 0.0% | 1 |
| [GROUP ONE TRADING LLC](https://holderbook.com/funds/932540-group-one-trading-llc/) | $16.9K | 5,331 | 0.0% | 4 |
| [SIMPLEX TRADING, LLC](https://holderbook.com/funds/1488542-simplex-trading-llc/) | $4.2K | 1,315 | 0.0% | 3 |
| [UBS Group AG](https://holderbook.com/funds/1610520-ubs-group-ag/) | $989 | 312 | 0.0% | 1 |

## Quarter by quarter

| Quarter | Holders | Reported value |
|---|---|---|
| Q2 2026 | 7 | $977.8K |
| Q1 2026 | 5 | $327.8K |
| Q4 2025 | 10 | $18.0M |
| Q3 2025 | 6 | $8.7M |