- 01 Ma Investment Partnership is a Hillsborough, California partnership run by managing partner Yao Ma. It returned to SEC reporting on May 18 after a three-year gap, and its Q1 2026 13F-HR (the quarterly holdings report big investors must file) shows a $208 million, 10-stock U.S. portfolio as of March 31.
- 02 The portfolio grew from $115 million in December to $208 million, up 81%, while the name count rose from 8 to 10.
- 03 Five stakes hold about 77% of the portfolio: SanDisk at $64 million after its share price nearly tripled, a brand-new Nvidia stake at $35 million, Vertiv at $25 million, AMD at $20 million after a 33% cut, and Viavi Solutions at $17 million.
- 04 The fund runs in round lots. Every holding sits at a flat 100,000 shares except Nvidia at 200,000 and Viavi at 500,000, so the quarter's moves read cleanly: Nvidia and Reddit in, AMD and Alibaba each cut by a third, everything else untouched.
- 05 The Q2 2026 13F is due by August 14. It will show whether the 200,000-share Nvidia stake keeps building and whether the AMD and Alibaba cuts continue toward full exits.
How Ma Investment Partnership Moved Last Quarter
What to watch
1. The fund’s Q2 2026 13F is due by August 14, 2026. It will show whether the new 200,000-share Nvidia stake was a one-quarter buy or a holding Yao Ma intends to keep building.
2. AMD fell from 150,000 shares to 100,000 and Alibaba made the identical cut. The next filing will show whether both head toward full exits or stop at the smaller round lot.
3. SanDisk’s share count has not moved since December while the stake’s value rose from $24 million to $64 million on the memory-chip rally. The Q2 filing will show whether the fund takes profits or lets its biggest holding keep compounding.
Verified as of June 5, 2026.
Primary Filings & Announcements
SEC EDGAR: Ma Investment Partnership 13F-HR Information Table (Q1 2026, filed May 18, 2026)
SEC EDGAR: 13F-HR Filing Index, Accession 0001536336-26-000004
SEC EDGAR: Ma Investment Partnership CIK 0001536336 Full 13F Filing History
Market Coverage
Yahoo Finance: SanDisk Quote and Performance
Yahoo Finance: Nvidia Quote and Performance
Yahoo Finance: Vertiv Quote and Performance
Background & Analysis
SEC EDGAR: Ma Investment Partnership Full Filing History (all forms)
SEC EDGAR: Prior Quarter 13F-HR Information Table (Q4 2025, filed May 18, 2026)