MainStreet Investment Advisors LLC holds a diversified book of 166 reported positions worth $734.3M as of Q2 2026 (disclosed Aug 12, 2026, a ~43-day 13F lag). This quarter Honeywell Aerospace Inc first appears in 13F filings, a listing rather than a purchase; they opened Honeywell International Inc and trimmed Ishares Core S&P Midcap ETF. Their largest long position is Ishares Core S&P Midcap ETF at 6% of the reported non-option book. Cloning the disclosed picks since 2024 would be +25% (+12.8%/yr). That is a simulation of the disclosed long book, not audited returns.
Following at the filing date actually beat the quarter-end book by 1.8 points over this window.
Growth of $10,000 cloning MainStreet Investment Advisors LLC's disclosed long 13F book, rebalanced on each filing date (so it reflects each quarter's actual reporting lag, ~43 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: diversified book
Share of the disclosed book in its largest positions. A higher top-5 share means a more concentrated, higher-conviction portfolio.
69% mapped to company sectors
+5 sectors below the cut, 6% 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 MainStreet Investment Advisors LLC
| Manager / fund | Shared names | Their $ in those |
|---|---|---|
| Donor Advised Charitable Giving, Inc. | 8 / 80 | $4.5B |
| Swiss Re Ltd | 55 / 80 | $1.0B |
| Prospect Hill Management, LLC | 8 / 80 | $231.8M |
| Rogco, LP | 75 / 80 | $268.2M |
| Hoey Investments, Inc | 58 / 80 | $631.9M |
| Skandinaviska Enskilda Banken AB (publ) | 20 / 80 | $2.1B |
| Capital & Planning, LLC | 21 / 80 | $154.3M |
| Ketron Financial | 19 / 80 | $253.8M |
Ranked by the share of each fund's own book sitting in the names it shares with MainStreet Investment Advisors 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 | iShares Core S&P Mid-Cap ETF ETF | $46.0M | 596.0K | 6.3% | ▼−6.2% Reduced · −39K sh | |
| 2 | iShares Msci Eafe ETF ETF | $42.1M | 404.8K | 5.7% | ▼−2.2% Reduced · −9K sh | |
| 3 | Apple Inc Common Stock | $37.3M | 129.1K | 5.1% | ▼−3.2% Reduced · −4K sh | |
| 4 | Vanguard Short-Term Treasury E ETF | $29.2M | 501.9K | 4.0% | ▲+0.3% Added · +1K sh | |
| 5 | Microsoft Corp Common Stock | $25.3M | 67.9K | 3.4% | ▼−0.1% Reduced · −86 sh | |
| 6 | Alphabet Inc Common Stock | $22.4M | 62.7K | 3.1% | ▼−8.9% Reduced · −6K sh | |
| 7 | iShares Core S&P Small-Cap ETF ETF | $21.3M | 143.9K | 2.9% | ▼−6.5% Reduced · −10K sh | |
| 8 | JPMorgan Chase & Co Common Stock | $20.6M | 63.0K | 2.8% | ▼−0.3% Reduced · −218 sh | |
| 9 | iShares Core S&P 500 ETF ETF | $17.4M | 23.2K | 2.4% | ▲+29% Added · +5K sh | |
| 10 | Caterpillar Inc Common Stock | $17.3M | 16.3K | 2.4% | ▼−12% Reduced · −2K sh | |
| 11 | Blackrock Inc Common Stock | $16.2M | 16.9K | 2.2% | ▼−0.8% Reduced · −140 sh | |
| 12 | Johnson & Johnson Common Stock | $16.0M | 63.2K | 2.2% | ▲+0.5% Added · +308 sh | |
| 13 | Broadcom Inc Common Stock | $15.9M | 42.0K | 2.2% | ▲+1.4% Added · +584 sh | |
| 14 | Nvidia Corp Common Stock | $15.3M | 76.7K | 2.1% | ▲+1.9% Added · +1K sh | |
| 15 | Vanguard Intermediate-Term Tre ETF | $14.9M | 253.0K | 2.0% | ▲+5.4% Added · +13K sh | |
| 16 | AbbVie Inc Common Stock | $13.5M | 53.7K | 1.8% | ▼−0.2% Reduced · −116 sh | |
| 17 | Amazon.com Inc Common Stock | $11.9M | 50.1K | 1.6% | ▼−1.5% Reduced · −770 sh | |
| 18 | Vanguard FTSE Emerging Markets ETF | $11.1M | 186.6K | 1.5% | ▼−2.7% Reduced · −5K sh | |
| 19 | Procter & Gamble Co Common Stock | $10.7M | 72.7K | 1.5% | ▼~0% Reduced · −25 sh | |
| 20 | Waste Management Inc Common Stock | $9.9M | 44.3K | 1.3% | ▲+0.2% Added · +105 sh | |
| 21 | Home Depot Inc Common Stock | $9.7M | 27.4K | 1.3% | ▲+0.1% Added · +39 sh | |
| 22 | Chevron Corp Common Stock | $9.1M | 54.7K | 1.2% | ▲+2.5% Added · +1K sh | |
| 23 | Cisco Systems Inc Common Stock | $8.3M | 71.0K | 1.1% | ▼−1.0% Reduced · −713 sh | |
| 24 | McDonald's Corp Common Stock | $7.7M | 28.5K | 1.0% | ▲+1.1% Added · +304 sh | |
| 25 | PepsiCo Inc Common Stock | $7.2M | 53.5K | 1.0% | ▼−2.1% Reduced · −1K sh | |
| 26 | Microchip Technology Inc Common Stock | $7.0M | 77.1K | 1.0% | ▼−0.1% Reduced · −113 sh | |
| 27 | Emerson Electric Co Common Stock | $6.9M | 48.3K | 0.9% | ▲+1.2% Added · +578 sh | |
| 28 | Palo Alto Networks Inc Common Stock | $6.6M | 19.4K | 0.9% | ▲+0.7% Added · +130 sh | |
| 29 | Goldman Sachs Group Inc Common Stock | $6.5M | 6.4K | 0.9% | ▲+4.2% Added · +261 sh | |
| 30 | Southern Co Common Stock | $6.3M | 65.9K | 0.9% | ▲+2.6% Added · +2K sh | |
| 31 | Lockheed Martin Corp Common Stock | $5.9M | 11.5K | 0.8% | ▲+1.5% Added · +172 sh | |
| 32 | US Bancorp Common Stock | $5.4M | 88.8K | 0.7% | ▲+2.3% Added · +2K sh | |
| 33 | Visa Inc Common Stock | $5.3M | 15.6K | 0.7% | ▼−1.6% Reduced · −248 sh | |
| 34 | Altria Group Inc Common Stock | $5.3M | 73.2K | 0.7% | ▲+3.0% Added · +2K sh | |
| 35 | American Electric Power Co Inc Common Stock | $5.2M | 38.1K | 0.7% | ▲+4.6% Added · +2K sh | |
| 36 | Vanguard Total Bond Market ETF ETF | $4.9M | 67.1K | 0.7% | ▲+7.7% Added · +5K sh | |
| 37 | Tesla Inc Common Stock | $4.8M | 11.5K | 0.7% | ▲~0% Added · +1 sh | |
| 38 | Qualcomm Inc Common Stock | $4.8M | 25.8K | 0.6% | ▼−0.7% Reduced · −189 sh | |
| 39 | Walmart Inc Common Stock | $4.7M | 41.1K | 0.6% | ▲+1.2% Added · +495 sh | |
| 40 | International Business Machine Common Stock | $4.5M | 16.1K | 0.6% | ▲+2.5% Added · +400 sh | |
| 41 | Cummins Inc Common Stock | $4.4M | 6.2K | 0.6% | ▼−0.7% Reduced · −44 sh | |
| 42 | Meta Platforms Inc Common Stock | $4.4M | 7.9K | 0.6% | ▼−9.6% Reduced · −837 sh | |
| 43 | Paychex Inc Common Stock | $4.3M | 43.9K | 0.6% | ▼−3.0% Reduced · −1K sh | |
| 44 | Enbridge Inc Common Stock | $4.3M | 79.6K | 0.6% | ▲+6.3% Added · +5K sh | |
| 45 | Marriott International Inc Common Stock | $4.3M | 11.6K | 0.6% | ▼−1.2% Reduced · −146 sh | |
| 46 | Cadence Design Systems Inc Common Stock | $4.1M | 11.0K | 0.6% | ▼−1.5% Reduced · −171 sh | |
| 47 | Honeywell International Inc Common Stock | $4.1M | 18.5K | 0.6% | ▲New New position | |
| 48 | Honeywell Aerospace Inc Common Stock | $4.1M | 18.7K | 0.6% | →Listed Newly reportable | |
| 49 | iShares Msci Acwi ETF ETF | $4.0M | 25.7K | 0.5% | ▼−1.5% Reduced · −395 sh | |
| 50 | Merck & Co Inc Common Stock | $4.0M | 31.1K | 0.5% | ▲+1.3% Added · +386 sh |
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/1729854/holdings"
Use Arkolith to show MainStreet Investment Advisors 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 | Aug 12, 2026 | 43d | 166 | $734.3M | 13F-HR |
| Q1 2026 | Mar 31, 2026 | May 11, 2026 | 41d | 158 | $664.5M | 13F-HR |
| Q4 2025 | Dec 31, 2025 | Feb 10, 2026 | 41d | 159 | $695.6M | 13F-HR |
| Q3 2025 | Sep 30, 2025 | Nov 10, 2025 | 41d | 161 | $743.8M | 13F-HR |
| Q2 2025 | Jun 30, 2025 | Aug 11, 2025 | 42d | 155 | $723.0M | 13F-HR |
| Q1 2025 | Mar 31, 2025 | Apr 30, 2025 | 30d | 156 | $687.3M | 13F-HR |
| Q4 2024 | Dec 31, 2024 | Feb 14, 2025 | 45d | 150 | $713.4M | 13F-HR |
| Q3 2024 | Sep 30, 2024 | Nov 12, 2024 | 43d | 156 | $752.7M | 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.