Old Second National Bank of Aurora
PERIOD 2026-Q2 (filed 2026-07-21) · SOURCE: SEC EDGAR (PUBLIC)
Holdings as of the 2026-Q2 13F-HR filing (filed 2026-07-21). 13F is disclosed up to 45 days after quarter-end.
What a 13F does — and does not — show
These figures come from Form 13F, a quarterly filing that large US institutional managers must submit to the SEC. It is a useful window, but a partial and lagged one, so read it carefully:
- It is a snapshot, up to 45 days old. A 13F shows what a manager held on the last day of a quarter, filed up to 45 days later — the fund may have traded since.
- Long US-listed stocks only. It excludes short positions, cash, bonds, most derivatives, and non-US or private holdings, so it is not the fund’s whole portfolio.
- Reported 13F value is not assets under management. Every share and concentration figure below is a percentage of the reported 13F value only — not the firm’s total assets.
- It describes, it does not recommend. A large or long-held position is not an endorsement, and none of this is investment advice.
Concentration
Share of reported portfolio value. Long US-listed equity positions as filed; percentages are of reported 13F value, which excludes shorts, cash, non-US and private holdings.
| Tier | Reported value | Share |
|---|---|---|
| Top position | $45M | 8.4% |
| Top 5 | $132M | 24.8% |
| Top 10 | $204M | 38.4% |
Top holdings
| # | Security | Shares | Reported value | % of value |
|---|---|---|---|---|
| 1 | MFSI MFS Active International ETF added | 1,373,983 | $45M | 8.4% |
| 2 | IJH Ishares Core S&P Midcap ETF added | 416,280 | $32M | 6.1% |
| 3 | NVDA Nvidia Corporation added | 102,070 | $20M | 3.8% |
| 4 | AVGO Broadcom Inc added | 50,023 | $19M | 3.6% |
| 5 | AAPL Apple Computer Inc added | 53,905 | $16M | 2.9% |
| 6 | GOOGL Alphabet Class A added | 43,609 | $16M | 2.9% |
| 7 | BSCR Invesco Bulletshares 2027 ETF trimmed | 771,905 | $15M | 2.9% |
| 8 | KLAC KLA Corp added | 48,348 | $15M | 2.7% |
| 9 | MSFT Microsoft Corp added | 37,750 | $14M | 2.7% |
| 10 | VGK Vanguard FTSE Europe ETF | 141,833 | $13M | 2.4% |
| 11 | GLW Corning Inc added | 46,216 | $12M | 2.2% |
| 12 | JPM J P Morgan Chase & Co added | 35,429 | $12M | 2.2% |
How this filer invests
Reproducible measures computed from the positions in this filer’s own 13F filings — not from any outside estimate.
How concentrated the book is
Across 275 reported positions. Shares are of reported 13F value (long US-listed equity), which is not the firm’s total assets. The concentration index (HHI) is the sum of each position’s squared weight — higher means a book concentrated in fewer names.
How much the book turned over
Between the 2026-Q1 and 2026-Q2 filings, on the stable identity of each holding (share classes combined). New positions and exits are counted by presence; adds and trims by share count, and a share-count change matching a standard split ratio with the value held steady is not counted as either.
Long-term holdings vs. higher turnover
Of its 20 largest reported positions, 14 have appeared in its 5 most recent consecutive quarterly filings (more than a year), and 6 are more recent. This filer reads as a longer-term holder: most of its largest positions have persisted for more than a year.
Notable sizing changes among its long-held positions:
- KLAC — share count increased 582%
- NVDA — share count increased 328%
- IJH — share count increased 284%
- AVGO — share count increased 251%
- BSCR — share count increased 148%
- JPM — share count reduced 43%
Directional only, measured over the filer’s largest reported positions across the quarters we track. 13F is a quarter-end snapshot, so a name can be held continuously yet slip in and out of the largest positions; this is a starting question, not a verdict.
Quarter-over-quarter changes — filed 2026-07-21
What changed between the 2026-Q1 and 2026-Q2 13F filings. New positions and exits reflect the tracked snapshot; adds and trims are measured on reported value (split-invariant), and moves under $0.25M are omitted as noise.
Between the 2026-Q1 and 2026-Q2 filings, this filer opened its largest new position in BXSL, added most to VWO, and trimmed FLIN the most. This describes what the 13F reported — not a recommendation.
New positions 2
- BXSL$4M
- ARCC$4M
Largest adds
- VWO$11M
- KLAC$7M
- MFSI$3M
- IJH$3M
- AVGO$2M
- GOOGL$2M
Largest trims
- FLIN$11M
- ENB$2M
- APTV$2M
- ZTS$1M
- NOC$1M
- NFLX$968K
Portfolio trend
Reported 13F value and position count by filing quarter (independent scales).
Frequently asked
What does Old Second National Bank of Aurora own?
Old Second National Bank of Aurora reported 275 long US-listed equity positions worth $530M in its 2026-Q2 13F filing.
What changed in Old Second National Bank of Aurora's portfolio last quarter?
Old Second National Bank of Aurora's 2026-Q2 filing is compared against its prior 13F to identify new positions, exits, and the largest increases and reductions, measured on reported value.
Where does this data come from?
Holdings are parsed from SEC Form 13F-HR filings on EDGAR (public filings). 13F is disclosed up to 45 days after quarter-end and reflects long US-listed equity positions only. Informational, not investment advice.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It is filed up to 45 days after quarter-end, so it is backward-looking — the manager may have traded since — and it covers long US-listed equities only, not short positions, cash, or private holdings. Reading a 13F tells you what a manager owned, not whether you should own it.