Chicago Capital Management, LLC reported 5 positions worth $19.48M for the quarter ended Sep 30, 2026, up 853.3% on the prior quarter. It opened 4 new positions, added to 0, trimmed 0 and exited 1. Its largest holding is Atkore Inc. at 48.4% of the portfolio.
Reported 13F market value at each quarter end. A change mixes trading with price moves in the positions held.
Dollar value of shares bought and sold each quarter, at that quarter’s price. It counts trading only, not price changes.
How many positions were opened, added to, trimmed or closed each quarter.
Share of reported value in each sector at every quarter end.
| Holding | Change | Change % | Trade Value | Weight |
|---|---|---|---|---|
| TECH BIO-TECHNE Corp | -37.5K | -100.0% | $2.02M | Exited |
| Holding | Shares Sold | Trade Value | Prior Weight |
|---|---|---|---|
| TECH BIO-TECHNE Corp | -37.5K | $2.02M | 98.71% |
| # | Activity | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | ATKR Atkore Inc. | Industrials | 130.5K | $9.43M | 48.38% | +130.5K | – | New | 0.39% |
| 2 | ITGR Integer Holdings Corp | Healthcare | 57.4K | $5.53M | 28.36% | +57.4K | – | New | 0.17% |
| 3 | HZO Marinemax Inc | Consumer Discretionary | 106.3K | $4.24M | 21.77% | +106.3K | – | New | 0.48% |
| 4 | ACVA ACV Auctions Inc. | Technology | 33.2K | $264.47K | 1.36% | +33.2K | – | New | 0.02% |
| 5 | XRXDW Xerox Holdings Corp | Industrials | 96.0K | $26.47K | 0.136% | 0 | 0.0% | Unchanged | 0% |
Tip. Select a row to see that position’s full history at Chicago Capital Management.
As of its Q3 2026 13F filing, Chicago Capital Management, LLC’s five largest positions were Atkore Inc. (ATKR) at 48.4%, Integer Holdings Corp (ITGR) at 28.4%, Marinemax Inc (HZO) at 21.8%, ACV Auctions Inc. (ACVA) at 1.4%, Xerox Holdings Corp (XRXDW) at 0.1% of the reported portfolio.
Chicago Capital Management, LLC reported a 13F portfolio worth $19.48M across 5 positions for Q3 2026. That is up 853.3% from the previous quarter.
Its largest purchases by value were Atkore Inc. ($9.43M), Integer Holdings Corp ($5.53M), Marinemax Inc ($4.24M). It opened 4 new positions.
Its largest sales by value were BIO-TECHNE Corp ($2.02M). It exited 1 positions entirely.
From the Form 13F-HR reports Chicago Capital Management, LLC files with the SEC each quarter, within 45 days of quarter end. A 13F lists long positions in US-listed equities and options; it excludes short positions, cash, bonds and most non-US holdings.
13F data reflects long positions in US-listed equities and options as reported to the SEC up to 45 days after quarter end. It excludes short positions, cash, bonds and most non-US securities, so it is not a complete picture of a manager’s assets.