Mainstream Capital Management LLC holds a focused book of 90 reported positions worth $166.1M as of Q2 2026 (disclosed Jul 15, 2026, a ~15-day 13F lag). This quarter they opened Intl Business Machines Corp and trimmed JPMorgan Ultra-Short Income. Their largest long position is JPMorgan Ultra-Short Income at 12% of the reported non-option book. Cloning the disclosed picks since 2024 would be +24% (+12.3%/yr). That is a simulation of the disclosed long book, not audited returns.
Growth of $10,000 cloning Mainstream Capital Management LLC's disclosed long 13F book, rebalanced on each filing date (so it reflects each quarter's actual reporting lag, ~15 days for the latest filing, with 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: focused book
Share of the disclosed book in its largest positions. A higher top-5 share means a more concentrated, higher-conviction portfolio.
61% mapped to company sectors
+3 sectors below the cut, 1% together
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 (an exit at the prior quarter-end), no cost basis
Other tracked managers holding the same core names as Mainstream Capital Management LLC
| Manager / fund | Shared names | Their $ in those |
|---|---|---|
| Donor Advised Charitable Giving, Inc. | 8 / 80 | $4.5B |
| Hoffman, Alan N Investment Management | 10 / 80 | $162.3M |
| Swiss Re Ltd | 37 / 80 | $1.0B |
| Prospect Hill Management, LLC | 10 / 80 | $243.7M |
| Draper Asset Management, LLC | 11 / 80 | $181.0M |
| Greenbrier Partners Capital Management, LLC | 8 / 80 | $1.2B |
| Conway Capital Management, Inc. | 20 / 80 | $205.4M |
| New World Advisors LLC | 36 / 80 | $533.8M |
Ranked by the share of each fund's own book sitting in the names it shares with Mainstream Capital Management LLC: only funds sharing at least a tenth of the book qualify. Index giants, bank custody books and market makers are excluded. They hold everything, so their overlap says nothing.
Bars show each position's share of the portfolio. Click a row for its position history.
| # | Security | Value | Shares | % Port | Last move | History |
|---|---|---|---|---|---|---|
| 1 | JPMorgan Ultra-Short Income ETF ETF | $20.3M | 402.2K | 12.2% | ▼−2.5% Reduced · −10K sh | |
| 2 | Apple Inc Com Stock | $9.9M | 34.1K | 5.9% | ▼−4.1% Reduced · −1K sh | |
| 3 | Goldman Sachs Ultra Short Bond ETF ETF | $9.5M | 187.4K | 5.7% | ▲+6.4% Added · +11K sh | |
| 4 | Amazon Com Inc Com Stock | $7.4M | 31.0K | 4.4% | ▼−0.6% Reduced · −184 sh | |
| 5 | Alphabet Inc Cap STK CL C Stock | $7.1M | 20.2K | 4.3% | ▼−0.1% Reduced · −23 sh | |
| 6 | Nvidia Corporation Com Stock | $5.5M | 27.6K | 3.3% | ▼−0.4% Reduced · −120 sh | |
| 7 | Ishares Russell 1000 Growth ETF ETF | $4.3M | 34.3K | 2.6% | ▲+294% Added · +26K sh | |
| 8 | Meta Platforms Inc CL A Stock | $4.2M | 7.5K | 2.5% | ▼−0.8% Reduced · −62 sh | |
| 9 | Corning Inc Com Stock | $3.6M | 14.3K | 2.2% | ▲+0.8% Added · +108 sh | |
| 10 | Ishares Russell 1000 Value ETF ETF | $3.5M | 14.6K | 2.1% | ▼−1.7% Reduced · −248 sh | |
| 11 | Ishares Core S&P 500 ETF ETF | $3.3M | 4.3K | 2.0% | ▼−1.9% Reduced · −83 sh | |
| 12 | Alphabet Inc Cap STK CL A Stock | $3.2M | 8.8K | 1.9% | ▼−2.4% Reduced · −220 sh | |
| 13 | JPMorgan Chase & Co Com Stock | $2.9M | 8.7K | 1.7% | ▼−0.2% Reduced · −17 sh | |
| 14 | Berkshire Hathaway Inc Del CL B New Stock | $2.7M | 5.4K | 1.6% | ▲+0.1% Added · +4 sh | |
| 15 | Eli Lilly & Co Com Stock | $2.7M | 2.3K | 1.6% | ▼−1.8% Reduced · −42 sh | |
| 16 | Crowdstrike Hldgs Inc CL A Stock | $2.6M | 3.5K | 1.6% | ▼−0.3% Reduced · −12 sh | |
| 17 | Palo Alto Networks Inc Com Stock | $2.6M | 7.7K | 1.6% | ▼−0.4% Reduced · −28 sh | |
| 18 | State Street SPDR S&P 500 ETF ETF | $2.6M | 3.5K | 1.6% | —Held | |
| 19 | Tesla Inc Com Stock | $2.5M | 6.0K | 1.5% | ▼−0.1% Reduced · −5 sh | |
| 20 | Advanced Micro Devices Inc Com Stock | $2.3M | 4.0K | 1.4% | ▲+27% Added · +859 sh | |
| 21 | Costco Wholesale Corporation Com Stock | $2.2M | 2.3K | 1.3% | ▼−0.2% Reduced · −5 sh | |
| 22 | SPDR Gold Shares ETF | $2.1M | 5.6K | 1.2% | ▼−9.7% Reduced · −600 sh | |
| 23 | Microsoft Corp Com Stock | $2.0M | 5.4K | 1.2% | ▲+0.1% Added · +5 sh | |
| 24 | Vanguard Information Technology ETF ETF | $1.9M | 16.1K | 1.2% | ▲+699% Added · +14K sh | |
| 25 | Goldman Sachs Group Inc Com Stock | $1.9M | 1.9K | 1.2% | ▼−0.4% Reduced · −7 sh | |
| 26 | Interactive Brokers Group Inc Com CL A Stock | $1.9M | 21.9K | 1.1% | ▲+0.5% Added · +109 sh | |
| 27 | Ge Vernova Inc Com Stock | $1.9M | 1.6K | 1.1% | ▲+16% Added · +225 sh | |
| 28 | TJX Cos Inc New Com Stock | $1.9M | 12.3K | 1.1% | ▲+0.3% Added · +33 sh | |
| 29 | International Business Machs Com Stock | $1.9M | 6.6K | 1.1% | ▲New New position | |
| 30 | Ishares Msci USA Quality Factor ETF ETF | $1.8M | 8.2K | 1.1% | ▼−0.3% Reduced · −21 sh | |
| 31 | Vanguard Mid-Cap Value ETF ETF | $1.8M | 9.0K | 1.1% | ▼−0.1% Reduced · −9 sh | |
| 32 | Vanguard Mid-Cap Growth ETF ETF | $1.8M | 5.8K | 1.1% | ▼−0.3% Reduced · −16 sh | |
| 33 | Cava Group Inc Com Stock | $1.7M | 21.4K | 1.0% | ▲+0.3% Added · +57 sh | |
| 34 | Netflix Inc. Com Stock | $1.6M | 23.0K | 1.0% | ▲+0.1% Added · +15 sh | |
| 35 | Toast Inc CL A Stock | $1.6M | 56.8K | 1.0% | ▼−1.1% Reduced · −610 sh | |
| 36 | Schwab Charles Corp Com Stock | $1.5M | 16.0K | 0.9% | ▼−4.0% Reduced · −663 sh | |
| 37 | Eaton Corp PLC SHS Stock | $1.5M | 3.5K | 0.9% | ▲+0.8% Added · +29 sh | |
| 38 | Walmart Inc Com Stock | $1.5M | 12.9K | 0.9% | ▼−1.5% Reduced · −203 sh | |
| 39 | Ishares Msci Eafe Value ETF ETF | $1.4M | 18.5K | 0.9% | ▼−0.1% Reduced · −19 sh | |
| 40 | Dover Corp Com Stock | $1.3M | 5.7K | 0.8% | ▲+0.9% Added · +54 sh | |
| 41 | Legalzoom Com Inc Com Stock | $1.2M | 200.0K | 0.7% | ▼−11% Reduced · −25K sh | |
| 42 | Ishares Msci Eafe Growth ETF ETF | $1.2M | 9.8K | 0.7% | ▼−0.1% Reduced · −10 sh | |
| 43 | Oreilly Automotive Inc Com Stock | $1.2M | 12.6K | 0.7% | ▼−0.6% Reduced · −74 sh | |
| 44 | Ishares U.S. Technology ETF ETF | $1.1M | 4.5K | 0.7% | ▼−0.5% Reduced · −21 sh | |
| 45 | Visa Inc Com CL A Stock | $1.1M | 3.2K | 0.7% | ▼−3.6% Reduced · −121 sh | |
| 46 | Broadcom Inc Com Stock | $1.1M | 2.8K | 0.6% | ▼−1.0% Reduced · −28 sh | |
| 47 | Applied Matls Inc Com Stock | $1.1M | 1.5K | 0.6% | —Held | |
| 48 | Ishares Core Msci Emerging Markets ETF ETF | $973K | 11.7K | 0.6% | ▼−0.1% Reduced · −6 sh | |
| 49 | Ishares S&P 500 Growth ETF ETF | $945K | 6.9K | 0.6% | ▼−0.1% Reduced · −5 sh | |
| 50 | Chevron Corporation Com Stock | $847K | 5.1K | 0.5% | —Held |
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/2043084/holdings"
Use Arkolith to show Mainstream Capital Management LLC's latest holdings, largest changes, and filing provenance.
As-of date vs the date the SEC received each filing
Reported 13F total per quarter. Raw filing totals can include option notional.
| Quarter | As of | Filed | Lag | Positions | Value | Form |
|---|---|---|---|---|---|---|
| Q2 2026 | Jun 30, 2026 | Jul 15, 2026 | 15d | 90 | $166.1M | 13F-HR |
| Q1 2026 | Mar 31, 2026 | Apr 17, 2026 | 17d | 88 | $149.1M | 13F-HR |
| Q4 2025 | Dec 31, 2025 | Jan 21, 2026 | 21d | 88 | $152.8M | 13F-HR |
| Q3 2025 | Sep 30, 2025 | Oct 20, 2025 | 20d | 87 | $150.4M | 13F-HR |
| Q2 2025 | Jun 30, 2025 | Jul 15, 2025 | 15d | 84 | $137.5M | 13F-HR |
| Q1 2025 | Mar 31, 2025 | Apr 28, 2025 | 28d | 86 | $126.2M | 13F-HR |
| Q4 2024 | Dec 31, 2024 | Feb 6, 2025 | 37d | 322 | $142.6M | 13F-HR |
| Q3 2024 | Sep 30, 2024 | Oct 31, 2024 | 31d | 84 | $117.6M | 13F-HR |
Holdings from SEC EDGAR 13F-HR filings, updated quarterly, filed up to 45 days after quarter-end. Public domain. Book totals and portfolio weights cover reported non-option positions, which can include notes and warrants. 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.