S.A. Mason LLC holds a diversified book of 282 stocks worth $325.5M as of Q2 2026 (disclosed Jul 31, 2026, a ~45-day 13F lag). This quarter they opened Hni Corp and trimmed Vanguard Total Stock MKT ETF. Their largest long position is Nvidia Corp at 5% of the equity book. Cloning the disclosed picks since 2025 would be +10% (+12.8%/yr). That is a simulation of the disclosed long book, not audited returns.
The public view is the crawlable proof. The same sourced dataset is available through REST and MCP for agents, research scripts, and back-office tools.
This fund page is the Follow view. The Build view lets your agent pull holdings, quarter changes, overlap, and source filings through API or MCP.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/funds/1800911/holdings"
Use Arkolith to show S.A. Mason LLC's latest holdings, largest changes, and filing provenance.
Following at the filing date actually beat the quarter-end book by 3.3 points over this window.
Growth of $10,000 cloning S.A. Mason LLC's disclosed long 13F book, rebalanced on each filing date (so it reflects the ~45-day reporting lag, no look-ahead), total-return basis (dividends reinvested), derived from end-of-day prices. “Their reported book” values the same picks from quarter-end, before they were public. S&P 500 is SPY total return over the same window. Excludes shorts, cash, options and non-13F holdings. Not investment advice.
Top-heavy: diversified book
Share of the disclosed book in its largest positions. A higher top-5 share means a more concentrated, higher-conviction portfolio.
56% mapped to company sectors
Direct operating-company sectors from our SIC-based security master. ETF/fund and unclassified holdings stay visible separately; this is not ETF look-through exposure.
Estimated $ traded · quarter-end prices, no cost basis
Bars show each stock's share of the portfolio. Click a row for its position history.
| # | Security | Value | Shares | % Port | Last move | History |
|---|---|---|---|---|---|---|
| 1 | Nvidia Corp COM | $16.1M | 80.4K | 4.9% | ▲+0.9% Added · +762 sh | |
| 2 | Vanguard Short Duration Tax-Exm Bd ETF ETF | $12.6M | 163.9K | 3.9% | ▲+38% Added · +45K sh | |
| 3 | Vanguard S&P 500 ETF ETF | $10.8M | 15.7K | 3.3% | ▲+28% Added · +3K sh | |
| 4 | Vanguard Total Stock Market ETF ETF | $10.4M | 28.2K | 3.2% | ▼−0.9% Reduced · −254 sh | |
| 5 | iShares Core S&P 500 ETF ETF | $10.1M | 13.5K | 3.1% | ▲+6.8% Added · +861 sh | |
| 6 | Vanguard Short-Term Tax-Exmpt Bd ETF ETF | $9.4M | 92.4K | 2.9% | ▲+75% Added · +40K sh | |
| 7 | Vanguard Small-Cap ETF ETF | $7.8M | 25.8K | 2.4% | ▲+11% Added · +3K sh | |
| 8 | Vanguard Mid-Cap ETF ETF | $7.6M | 94.0K | 2.3% | ▲+333% Added · +72K sh | |
| 9 | Apple Inc COM | $6.8M | 23.4K | 2.1% | ▲+4.3% Added · +975 sh | |
| 10 | SPDR S&P 500 ETF Trust ETF | $6.6M | 8.8K | 2.0% | ▲+0.1% Added · +14 sh | |
| 11 | Vanguard Intermediate-Term Tax-Exempt Bond ETF ETF | $6.4M | 63.4K | 2.0% | ▲+15% Added · +8K sh | |
| 12 | Microsoft Corp COM | $6.3M | 16.9K | 1.9% | ▲+8.9% Added · +1K sh | |
| 13 | Sandisk Corp COM | $5.3M | 2.3K | 1.6% | ▼−0.2% Reduced · −4 sh | |
| 14 | Costco Wholesale Corp COM | $4.9M | 5.2K | 1.5% | ▲+4.2% Added · +210 sh | |
| 15 | Micron Technology Inc COM | $4.6M | 4.0K | 1.4% | ▼−24% Reduced · −1K sh | |
| 16 | Vanguard FTSE Developed Market ETF | $4.4M | 61.1K | 1.3% | ▲+36% Added · +16K sh | |
| 17 | Vanguard Core Tax-Exempt Bond ETF ETF | $4.0M | 52.8K | 1.2% | ▲+3.5% Added · +2K sh | |
| 18 | Alphabet Inc COM | $4.0M | 11.1K | 1.2% | ▲+2.2% Added · +243 sh | |
| 19 | Palo Alto Networks Inc COM | $3.8M | 11.2K | 1.2% | ▼−0.5% Reduced · −58 sh | |
| 20 | Strive 500 ETF ETF | $3.7M | 75.9K | 1.1% | ▲+2.3% Added · +2K sh | |
| 21 | General Electric Co COM | $3.2M | 8.6K | 1.0% | ▲+11% Added · +868 sh | |
| 22 | AbbVie Inc COM | $3.1M | 12.3K | 1.0% | ▲+0.9% Added · +106 sh | |
| 23 | HNI Corp COM | $3.1M | 76.0K | 0.9% | ▲New New position | |
| 24 | Eli Lilly & Co COM | $3.0M | 2.5K | 0.9% | ▲+27% Added · +520 sh | |
| 25 | Visa Inc COM | $2.8M | 8.2K | 0.9% | ▲+4.0% Added · +316 sh | |
| 26 | Palantir Technologies Inc COM | $2.6M | 22.4K | 0.8% | ▲+0.2% Added · +50 sh | |
| 27 | Kimberly-Clark Corp COM | $2.6M | 23.3K | 0.8% | ▲+64% Added · +9K sh | |
| 28 | TJX Cos Inc COM | $2.6M | 16.9K | 0.8% | —Held | |
| 29 | Mastercard Inc COM | $2.5M | 4.9K | 0.8% | ▼−0.2% Reduced · −9 sh | |
| 30 | SPDR Portfolio S&P 400 Mid Cap ETF | $2.5M | 36.8K | 0.8% | ▲+0.3% Added · +118 sh | |
| 31 | Alphabet Inc COM | $2.5M | 7.0K | 0.8% | ▲+13% Added · +810 sh | |
| 32 | SPDR Gold Shares ETF | $2.4M | 6.6K | 0.8% | ▲+2.1% Added · +137 sh | |
| 33 | Akre Focus ETF ETF | $2.4M | 45.4K | 0.7% | —Held | |
| 34 | Vanguard Large-Cap ETF ETF | $2.3M | 6.8K | 0.7% | ▲+0.1% Added · +5 sh | |
| 35 | Amgen Inc COM | $2.3M | 6.4K | 0.7% | ▲+2.0% Added · +125 sh | |
| 36 | Vanguard Tax-Exempt Bond Index ETF | $2.2M | 43.1K | 0.7% | ▲+9.6% Added · +4K sh | |
| 37 | O'Reilly Automotive Inc COM | $2.1M | 23.3K | 0.7% | ▲+0.4% Added · +100 sh | |
| 38 | CrowdStrike Holdings Inc COM | $2.1M | 2.8K | 0.6% | ▲+0.1% Added · +3 sh | |
| 39 | iShares Short-Term National AMT-Free Muni Bond ETF ETF | $2.1M | 19.6K | 0.6% | ▲+109% Added · +10K sh | |
| 40 | Chevron Corp COM | $2.1M | 12.6K | 0.6% | ▲+14% Added · +2K sh | |
| 41 | Procter & Gamble Co COM | $2.1M | 14.2K | 0.6% | ▼−0.1% Reduced · −13 sh | |
| 42 | iShares Russell 1000 Growth ET ETF | $2.0M | 16.5K | 0.6% | ▲+300% Added · +12K sh | |
| 43 | PepsiCo Inc COM | $2.0M | 14.8K | 0.6% | ▲+3.0% Added · +433 sh | |
| 44 | Johnson & Johnson COM | $2.0M | 7.8K | 0.6% | ▲+4.1% Added · +308 sh | |
| 45 | Meta Platforms Inc COM | $2.0M | 3.5K | 0.6% | ▲+0.8% Added · +30 sh | |
| 46 | Schwab US Broad Market ETF ETF | $1.9M | 66.9K | 0.6% | ▲~0% Added · +25 sh | |
| 47 | Vertiv Holdings Co COM | $1.9M | 5.7K | 0.6% | ▼−0.5% Reduced · −29 sh | |
| 48 | Schwab U.S. Mid-Cap ETF ETF | $1.8M | 49.1K | 0.6% | ▲~0% Added · +10 sh | |
| 49 | Berkshire Hathaway Inc COM | $1.8M | 3.6K | 0.6% | ▲+6.2% Added · +211 sh | |
| 50 | Intel Corp COM | $1.8M | 12.9K | 0.6% | ▲+18% Added · +2K sh |
As-of date vs the date the SEC received each filing
Holdings from SEC EDGAR 13F-HR filings, updated quarterly ~45 days after quarter-end. Public domain. The book and weighting are long equity only; disclosed put/call options are listed separately and excluded from those totals. The performance line is a simulation of the disclosed long book, not an audited return.