Old Second Bancorp Inc. 13F holders
184 funds reported a position in Old Second Bancorp Inc. in their 13F for the quarter ended 30 June 2026, together 38.8 million shares worth $903.3 million. Against the quarter before, 17 opened a position, 76 added, 47 trimmed and 19 sold out; together they bought a net 1.1 million shares. The largest holders: BlackRock, Inc., Dimensional Fund Advisors LP and Vanguard Capital Management LLC.
Funds holding184-4 on Q1 2026
Shares they held38.8Mworth $903.3 million
Net bought on the quarter1.1M sharesabout $25.3 million at the funds' values
Funds buying to selling93 to 66opened or added, to cut or sold
Opened 17Added 76Held 43Trimmed 47Sold out 19
What each fund did in OSBC against its 13F for the quarter before; a change under 0.1% of a holding counts as held
Funds reporting a position in OSBC in their 13F, each quarter; hover a bar for the shares they held
Filed so far for the quarter to 30 September 2026
3,241 funds have filed their 13F for the quarter so far; the rest are due by 16 November 2026. Of those, 39 reported a position in Old Second Bancorp Inc.: 5 opened one, 14 added, 5 trimmed and 3 sold out, a net 653,074 shares sold.
The largest moves in the name among the funds that have filed, against each fund's previous 13F.
The well-known funds
Of the 44 funds followed here, 5 reported a position in Old Second Bancorp Inc. in a 13F for the quarter ended 30 June 2026. The largest: Geode Capital Management, 1.3 million shares worth $31.5 million, 0.0% of its reported book. Sold out: Millennium Management. In the quarter, 4 funds added or opened a position and 2 trimmed or sold out; together they bought a net 378,440 shares, about $8.8 million at the funds' own value per share on 30 June 2026. A change under 0.1% of a holding counts as held.
| Fund | Shares | Value | Of its book | Change on the quarter | Status | Quarter ended | Filing |
|---|---|---|---|---|---|---|---|
| Geode Capital Management | 1,349,432 | $31.5 million | 0.0% | +67,421 | added | 30 June 2026 | 13F |
| Citadel Advisors | 304,021 | $7.1 million | 0.0% | +243,956 | added | 30 June 2026 | 13F |
| Two Sigma Investments | 200,819 | $4.7 million | 0.0% | +133,462 | added | 30 June 2026 | 13F |
| FMR LLC | 39,922 | $930,983 | 0.0% | +34,080 | added | 30 June 2026 | 13F |
| Renaissance Technologies | 21,221 | $494,874 | 0.0% | -69,004 | trimmed | 30 June 2026 | 13F |
| Millennium Management | 0 | $0 | 0.0% | -31,475 | exited | 30 June 2026 | 13F |
Value is what the fund reported.
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Change is shares against the fund's previous 13F; a fund with one filing read shows no change. 13Fs cover long US positions of managers above $100 million and are filed up to 45 days after the quarter.The largest holders
| Fund | Shares | Share of all | Value | Of its book | Change in shares | Filing |
|---|---|---|---|---|---|---|
| BlackRock, Inc. | 4,298,683 | 11.07% | $100.2 million | 0.00% | +172,439 | 13F |
| Dimensional Fund Advisors LP | 2,498,671 | 6.43% | $58.3 million | 0.01% | +109,809 | 13F |
| Vanguard Capital Management LLC | 2,179,877 | 5.61% | $50.8 million | 0.00% | -71,972 | 13F |
| State Street Corp. | 1,839,202 | 4.74% | $42.9 million | 0.00% | +239,900 | 13F |
| Davis Asset Management, L.P. | 1,800,000 | 4.64% | $42.0 million | 1.06% | no change | 13F |
| American Century Companies Inc. | 1,783,820 | 4.59% | $41.6 million | 0.02% | +192,877 | 13F |
| Goldman Sachs Group Inc. | 1,624,852 | 4.18% | $37.9 million | 0.00% | -66,671 | 13F |
| FJ Capital Management LLC | 1,460,413 | 3.76% | $34.1 million | 4.42% | -44,689 | 13F |
| Boston Partners | 1,415,165 | 3.64% | $32.9 million | 0.03% | -28,724 | 13F |
| Geode Capital Management, LLC | 1,349,432 | 3.48% | $31.5 million | 0.00% | +67,421 | 13F |
| Kennedy Capital Management LLC | 1,236,983 | 3.19% | $28.8 million | 0.51% | -31,507 | 13F |
| Banc Funds Co. LLC | 1,034,143 | 2.66% | $24.1 million | 3.98% | +5,000 | 13F |
| Manufacturers Life Insurance Company, the | 872,651 | 2.25% | $20.4 million | 0.02% | -6,019 | 13F |
| Vanguard Portfolio Management LLC | 819,368 | 2.11% | $19.1 million | 0.00% | +106,935 | 13F |
| Stieven Capital Advisors, L.P. | 815,328 | 2.10% | $19.0 million | 3.63% | +41,800 | 13F |
| River Street Advisors LLC | 779,008 | 2.01% | $18.2 million | 5.35% | +32,348 | 13F |
| Northern Trust Corp. | 555,408 | 1.43% | $13.0 million | 0.00% | -208,933 | 13F |
| AllianceBernstein L.P. | 641,845 | 1.65% | $12.9 million | 0.00% | -49,000 | 13F |
| JPMorgan Chase & Co. | 555,602 | 1.43% | $12.9 million | 0.00% | -145,351 | 13F |
| Wellington Management Group LLP | 544,345 | 1.40% | $12.7 million | 0.00% | -313,440 | 13F |
| Nuveen, LLC | 492,162 | 1.27% | $11.5 million | 0.00% | +72,520 | 13F |
| Bridgeway Capital Management, LLC | 453,323 | 1.17% | $10.6 million | 0.19% | +15,068 | 13F |
| Charles Schwab Investment Management Inc. | 431,304 | 1.11% | $10.1 million | 0.00% | +394 | 13F |
| AQR Capital Management LLC | 386,234 | 0.99% | $9.0 million | 0.00% | -5,726 | 13F |
| Bank of America Corp. | 372,648 | 0.96% | $8.7 million | 0.00% | +41,318 | 13F |
| Gator Capital Management, LLC | 359,730 | 0.93% | $8.4 million | 1.80% | +8,250 | 13F |
| Bank of New York Mellon Corp | 342,013 | 0.88% | $8.0 million | 0.00% | +4,749 | 13F |
| Vanguard Fiduciary Trust Co. | 341,200 | 0.88% | $8.0 million | 0.00% | +5,717 | 13F |
| Congress Asset Management Co. | 338,650 | 0.87% | $7.9 million | 0.05% | new | 13F |
| Morgan Stanley | 318,318 | 0.82% | $7.4 million | 0.00% | +39,931 | 13F |
| Citadel Advisors LLC | 304,021 | 0.78% | $7.1 million | 0.00% | +243,956 | 13F |
| Franklin Resources Inc. | 259,324 | 0.67% | $6.0 million | 0.00% | +171,158 | 13F |
| Empowered Funds, LLC | 248,627 | 0.64% | $5.8 million | 0.03% | +15,068 | 13F |
| Thrivent Financial for Lutherans | 242,278 | 0.62% | $5.7 million | 0.01% | +99,159 | 13F |
| Mariner, LLC | 225,303 | 0.58% | $5.3 million | 0.01% | +207,236 | 13F |
| Arrowstreet Capital, Limited Partnership | 210,745 | 0.54% | $4.9 million | 0.00% | +69,719 | 13F |
| Forum Financial Management, LP | 205,673 | 0.53% | $4.8 million | 0.06% | +12 | 13F |
| Great Lakes Advisors, LLC | 203,909 | 0.53% | $4.8 million | 0.04% | +5,905 | 13F |
| Two Sigma Investments, LP | 200,819 | 0.52% | $4.7 million | 0.00% | +133,462 | 13F |
| Squarepoint Ops LLC | 167,884 | 0.43% | $3.9 million | 0.01% | -2,767 | 13F |
| Blair William & Co. | 163,228 | 0.42% | $3.8 million | 0.01% | +345 | 13F |
| Siena Capital Partners GP, LLC | 163,038 | 0.42% | $3.8 million | 0.92% | no change | 13F |
| EJF Capital LP | 151,358 | 0.39% | $3.5 million | 2.36% | +188 | 13F |
| UBS Group AG | 147,223 | 0.38% | $3.4 million | 0.00% | -112,051 | 13F |
| Victory Capital Management Inc. | 141,914 | 0.37% | $3.3 million | 0.00% | +2,860 | 13F |
| Russell Investments Group, Ltd. | 135,010 | 0.35% | $3.1 million | 0.00% | +23,061 | 13F |
| Elizabeth Park Capital Advisors, Ltd. | 129,457 | 0.33% | $3.0 million | 2.08% | -37,000 | 13F |
| Sei Investments Co. | 117,666 | 0.30% | $2.7 million | 0.00% | -85,422 | 13F |
| D. E. Shaw & Co., Inc. | 114,326 | 0.29% | $2.7 million | 0.00% | new | 13F |
| Curi Capital, LLC | 100,505 | 0.26% | $2.3 million | 0.04% | no change | 13F |
The 50 largest of the 184 funds that reported a position in OSBC in their 13F for the quarter ended 30 June 2026, by the value each reported.
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Share of all is the fund's part of all the shares the funds reported. Change is shares against the fund's 13F for the quarter before. A 13F lists a manager's long positions in US-listed shares at the quarter's end. What is a 13F?Schedule 13D and 13G filed on the name, last twelve months
| Filed | Schedule | Who | Holding | Of the class | Event date | Rule or purpose | Filing |
|---|---|---|---|---|---|---|---|
| 8 October 2026 | 13G | Dimensional Fund Advisors LP and 1 other | 2.6 million | 5.1% | 30 September 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 27 March 2026 | 13G/A | The Vanguard Group and 1 other | 0 | 0.0% | 13 March 2026 | passive, institutional (13d-1(b)) | EDGAR |
A Schedule 13D is filed by anyone who crosses 5% of a class with intent to influence; a 13G by a passive holder.
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Amendments (/A) report a change, including an exit to zero. Holding and percentage are as the filer stated them on the cover page; the purpose is the filer's own words, cut short. 13D and 13GFails to deliver
| Settlement date | Shares failed | Price | File |
|---|---|---|---|
| 11 September 2026 | 10,359 | $25.53 | SEC |
| 8 September 2026 | 12 | $25.72 | SEC |
| 4 September 2026 | 392 | $25.68 | SEC |
| 1 September 2026 | 18,994 | $25.08 | SEC |
| 31 August 2026 | 558 | $25.24 | SEC |
| 24 August 2026 | 5,959 | $25.34 | SEC |
Shares that failed to deliver at settlement, per day, from the SEC's half-month files, which arrive about two weeks after the period.