S.A. Mason
S.A. Mason reported 284 stocks worth $341M in its 13F filing for Q3 2026, filed Oct 13, 2026. Its largest holdings are NVDA (5.5%), VSDM (3.9%) and VOO (3.6%). Compared with Q2 2026, the fund added to NVDA, VSDM and VOO, trimmed AAPL, PANW and SNDK and sold out of UNH, RKLB and PRGO.
Holdings
| # | Stock | Value | Weight | Shares | Change | Shares, 8 qtrs | Held |
|---|---|---|---|---|---|---|---|
| 1 |  NVDA Nvidia Corporation | $18.7M | 5.5% | 82K | +1,563 (+2%) | 8 of 8 | |
| 2 |  VSDM Vanguard Short Dur Tax | $13.4M | 3.9% | 180K | +16K (+10%) | 4 of 8 | |
| 3 |  VOO Vanguard S&P 500 ETF | $12.3M | 3.6% | 18K | +1,785 (+11%) | 8 of 8 | |
| 4 |  VTI Vanguard Total Stock Market ETF | $11.8M | 3.5% | 31K | +3,233 (+11%) | 8 of 8 | |
| 5 |  IVV Ishares TR | $10.4M | 3.0% | 14K | No change | 8 of 8 | |
| 6 |  VTES Van Sht TX Expt Bnd | $10M | 2.9% | 101K | +8,544 (+9%) | 4 of 8 | |
| 7 |  MSFT Microsoft Corp | $8.7M | 2.5% | 17K | +38 (+0%) | 8 of 8 | |
| 8 |  VO Vanguard Index Fds | $7.7M | 2.3% | 98K | +4,206 (+4%) | 8 of 8 | |
| 9 |  AAPL Apple Inc | $7.7M | 2.3% | 23K | −249 (−1%) | 8 of 8 | |
| 10 |  VB Vanguard Index Fds | $7.6M | 2.2% | 27K | +799 (+3%) | 8 of 8 |
Positions at Sep 30, 2026, as reported. Change is against the fund's Q2 2026 filing; weight is the share of the fund's reported stocks.
Sold out
held in Q2 2026, gone in Q3 2026| Stock | Value last quarter | Shares sold |
|---|---|---|
 UNH Unitedhealth Group Inc | $986K | 2,372 |
DIMENSIONAL U S SMALL CAP ETF | $625K | 7,588 |
 RKLB Rocket Lab Corp | $203K | 2,001 |
 PRGO Perrigo Co PLC | $156K | 15K |
DIMENSIONAL U S TARGETED | $142K | 2,029 |
🔒 Free account: see all 10.
Reported value
last 8 quartersThe value of the US stocks the fund reported, at quarter end prices. It moves with the market as well as with buying and selling.
Filings for Q3 2026
straight from the SEC| Filed | Form | Quarter | |
|---|---|---|---|
| Oct 13, 2026 | 13F-HR | Q3 2026 | SEC filing ↗ |
Other superinvestors
All hedge fund holdings →S.A. Mason 13F FAQ
What does S.A. Mason own?
S.A. Mason reported 284 stocks worth $341M in its 13F filing for Q3 2026, filed Oct 13, 2026. The table above lists every position in the filing (the top 10 without an account).
What did S.A. Mason buy and sell in Q3 2026?
Compared with Q2 2026: 12 new positions, 89 added to, 40 trimmed and 10 sold out. It sold all of UNH, RKLB and PRGO.
When will S.A. Mason file its next 13F?
Holdings as of Dec 31, 2026 are due by Feb 15, 2027. The filing appears on this page within minutes of reaching the SEC.
How much is S.A. Mason's portfolio worth?
The Q3 2026 filing reports $341M in US stocks. That leaves out cash, bonds, short positions and most foreign holdings, so the fund's total assets are usually larger.
For informational and educational purposes only. Not investment advice, and not a recommendation to buy or sell any security. Holdings come from the fund's SEC Form 13F filings as reported and show positions at the end of the quarter, up to 45 days before the filing. The fund may have changed its positions since. A 13F leaves out short positions, cash, bonds and most foreign holdings. See all hedge fund holdings.