Old Second National Bank Of Aurora holds a diversified book of 275 reported positions worth $530.5M as of Q2 2026 (disclosed Jul 21, 2026, a ~21-day 13F lag). This quarter they opened Blackstone Secured Lending F and trimmed MFS Active International. Their largest long position is MFS Active International at 8% of the reported non-option book. Cloning the disclosed picks since 2024 would be +33% (+16.4%/yr). That is a simulation of the disclosed long book, not audited returns.
Old Second National Bank Of Aurora files as a bank or broker: much of this book is custody and client positions, not a proprietary portfolio.
Following at the filing date actually beat the quarter-end book by 5.3 points over this window.
Growth of $10,000 cloning Old Second National Bank Of Aurora's disclosed long 13F book, rebalanced on each filing date (so it reflects each quarter's actual reporting lag, ~21 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.
62% mapped to company sectors
+5 sectors below the cut, 7% 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 Old Second National Bank Of Aurora
| Manager / fund | Shared names | Their $ in those |
|---|---|---|
| Swiss Re Ltd | 42 / 80 | $1.0B |
| Uhlmann Price Securities, LLC | 37 / 80 | $2.5B |
| Emerald Advisors, LLC | 35 / 80 | $650.2M |
| Independent Investors Inc | 27 / 80 | $420.4M |
| Greenleaf Trust | 65 / 80 | $7.9B |
| Oakmont Corp | 13 / 80 | $384.6M |
| River Street Advisors LLC | 73 / 80 | $259.8M |
| Marest Capital, LLC | 11 / 80 | $151.0M |
Ranked by the share of each fund's own book sitting in the names it shares with Old Second National Bank Of Aurora: 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 | MFS Active International ETF Com | $44.6M | 1.37M | 8.4% | ▼−0.8% Reduced · −11K sh | |
| 2 | Ishares Core S&P Midcap ETF Com | $32.1M | 416.3K | 6.1% | ▼−2.1% Reduced · −9K sh | |
| 3 | Nvidia Corporation Com | $20.4M | 102.1K | 3.8% | ▼−3.9% Reduced · −4K sh | |
| 4 | Broadcom Inc Com | $18.9M | 50.0K | 3.6% | ▼−6.9% Reduced · −4K sh | |
| 5 | Apple Computer Inc Com | $15.6M | 53.9K | 2.9% | ▼−3.5% Reduced · −2K sh | |
| 6 | Alphabet Class A Com | $15.6M | 43.6K | 2.9% | ▼−7.0% Reduced · −3K sh | |
| 7 | Invesco Bulletshares 2027 ETF Com | $15.1M | 771.9K | 2.9% | ▼−3.0% Reduced · −24K sh | |
| 8 | KLA Corp Com | $14.6M | 48.3K | 2.7% | ▲+783% Added · +43K sh | |
| 9 | Microsoft Corp Com | $14.1M | 37.8K | 2.7% | ▲+4.6% Added · +2K sh | |
| 10 | Vanguard FTSE Europe ETF Com | $12.6M | 141.8K | 2.4% | ▼−7.8% Reduced · −12K sh | |
| 11 | Corning Inc Com | $11.8M | 46.2K | 2.2% | ▼−41% Reduced · −32K sh | |
| 12 | J P Morgan Chase & Co Com | $11.6M | 35.4K | 2.2% | ▼−2.7% Reduced · −990 sh | |
| 13 | Morgan Stanley Com | $10.9M | 52.4K | 2.1% | ▼−5.7% Reduced · −3K sh | |
| 14 | Vanguard MSCI Emerging Markets ETF Com | $10.9M | 183.2K | 2.1% | ▲43× Added · +179K sh | |
| 15 | Cummins Inc. Com | $10.7M | 15.0K | 2.0% | ▼−9.9% Reduced · −2K sh | |
| 16 | Eli Lilly & Co Com | $10.2M | 8.5K | 1.9% | ▼−4.0% Reduced · −358 sh | |
| 17 | Vanguard FTSE Developed Markets ETF Com | $9.8M | 138.0K | 1.9% | ▲+3.5% Added · +5K sh | |
| 18 | SPDR S&P 500 ETF Com | $9.1M | 12.2K | 1.7% | ▼−1.5% Reduced · −183 sh | |
| 19 | Amazon.com Inc. Com | $8.0M | 33.4K | 1.5% | ▼−1.9% Reduced · −646 sh | |
| 20 | Vanguard Total World Stock ETF Com | $7.5M | 47.6K | 1.4% | ▼−4.2% Reduced · −2K sh | |
| 21 | Pulte Homes, Inc Com | $7.2M | 52.8K | 1.4% | ▼−2.3% Reduced · −1K sh | |
| 22 | Blackrock Financial Class B Com | $6.9M | 7.2K | 1.3% | ▼−2.6% Reduced · −197 sh | |
| 23 | Invesco Bulletshares 2028 ETF Com | $6.9M | 340.2K | 1.3% | ▲~0% Added · +21 sh | |
| 24 | Johnson & Johnson Com | $6.9M | 27.2K | 1.3% | ▼−4.3% Reduced · −1K sh | |
| 25 | SPDR Portfolio S&P 500 ETF Com | $6.5M | 73.5K | 1.2% | ▲+10% Added · +7K sh | |
| 26 | Blackstone Inc Com | $5.4M | 46.2K | 1.0% | ▲+24% Added · +9K sh | |
| 27 | Invesco Bulletshares 2027 High Yld ETF Com | $5.3M | 236.7K | 1.0% | ▼−9.2% Reduced · −24K sh | |
| 28 | Viking Holdings Ltd. Com | $5.1M | 48.9K | 1.0% | ▼−5.7% Reduced · −3K sh | |
| 29 | Valero Energy Corp Com | $5.0M | 19.3K | 0.9% | ▼−7.9% Reduced · −2K sh | |
| 30 | Abbvie Inc Com | $4.8M | 19.2K | 0.9% | ▼−1.5% Reduced · −296 sh | |
| 31 | Fifth Third Bancorp Com | $4.6M | 81.5K | 0.9% | ▼−0.5% Reduced · −391 sh | |
| 32 | EOG Resources Inc Com | $4.5M | 35.0K | 0.9% | ▲+29% Added · +8K sh | |
| 33 | Chevron Corp Com | $4.5M | 27.2K | 0.8% | ▲+27% Added · +6K sh | |
| 34 | Metlife Inc Com | $4.4M | 51.8K | 0.8% | ▼−1.1% Reduced · −568 sh | |
| 35 | Sofi Technologies Inc Com | $4.3M | 240.9K | 0.8% | ▲+39% Added · +67K sh | |
| 36 | Eaton Corp PLC Com | $4.3M | 10.1K | 0.8% | ▼−1.4% Reduced · −143 sh | |
| 37 | Pepsico Inc. Com | $4.2M | 31.3K | 0.8% | ▼−3.1% Reduced · −999 sh | |
| 38 | Blackstone Secured Lending Fund Com | $4.2M | 175.5K | 0.8% | ▲New New position | |
| 39 | Ares Capital Corporation Com | $4.2M | 224.3K | 0.8% | ▲New New position | |
| 40 | Capital One Financial Com | $3.8M | 19.0K | 0.7% | ▲+4.5% Added · +819 sh | |
| 41 | Northrop Grumman Corp Com | $3.7M | 7.3K | 0.7% | ▼−2.3% Reduced · −171 sh | |
| 42 | Nextera Energy Inc Com | $3.7M | 42.1K | 0.7% | ▲+7.0% Added · +3K sh | |
| 43 | Prologis Inc Com | $3.5M | 26.1K | 0.7% | ▼−3.7% Reduced · −1K sh | |
| 44 | Norfolk Southern Corp Com | $3.5M | 11.0K | 0.7% | ▼−1.2% Reduced · −136 sh | |
| 45 | Mastercard Inc. Com | $3.3M | 6.4K | 0.6% | ▲+2.1% Added · +133 sh | |
| 46 | First Trust Cybersecurity ETF Com | $3.2M | 35.2K | 0.6% | ▼−3.9% Reduced · −1K sh | |
| 47 | Procter & Gamble Co Com | $2.9M | 19.9K | 0.5% | ▼−0.1% Reduced · −22 sh | |
| 48 | United Parcel Service Inc Class B Com | $2.9M | 26.8K | 0.5% | ▼−0.1% Reduced · −42 sh | |
| 49 | Welltower Inc Com | $2.8M | 12.4K | 0.5% | ▼−10.0% Reduced · −1K sh | |
| 50 | Badger Meter Inc Com | $2.8M | 18.6K | 0.5% | ▲+8.2% Added · +1K sh |
This bank 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/903783/holdings"
Use Arkolith to show OLD SECOND NATIONAL BANK OF AURORA'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 21, 2026 | 21d | 387 | $530.5M | 13F-HR |
| Q1 2026 | Mar 31, 2026 | Apr 21, 2026 | 21d | 391 | $483.9M | 13F-HR |
| Q4 2025 | Dec 31, 2025 | Jan 27, 2026 | 27d | 402 | $500.0M | 13F-HR |
| Q3 2025 | Sep 30, 2025 | Oct 22, 2025 | 22d | 401 | $485.4M | 13F-HR |
| Q2 2025 | Jun 30, 2025 | Jul 21, 2025 | 21d | 419 | $458.0M | 13F-HR |
| Q1 2025 | Mar 31, 2025 | Apr 21, 2025 | 21d | 431 | $424.7M | 13F-HR |
| Q4 2024 | Dec 31, 2024 | Jan 23, 2025 | 23d | 640 | $439.8M | 13F-HR |
| Q3 2024 | Sep 30, 2024 | Nov 5, 2024 | 36d | 457 | $414.2M | 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.