Chicago Capital Management, LLC — 13F Holdings & Portfolio
CIK 1580162 · latest 13F-HR filed 2026-10-21
Chicago Capital Management, LLC manages $110.4M in 13F-reported U.S. long-equity assets across 26 reported positions as of its 2026-09-30 13F-HR filing. Its largest disclosed positions are ATKR (8.54%), RPD (7.53%), LAR (6.36%). Quarter over quarter (versus its 2026-06-30 filing) the fund opened 13 new positions and exited 14; 7 existing positions rose in reported value and 0 fell.
AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.
Long-equity book
Distinct positions
Filed 2026-10-21
vs 2026-06-30
Portfolio charts
Latest quarter's book, what changed, and how the portfolio has evolved across filings.
Portfolio map
Q3 26Box size = position value; colour = change in share count vs the prior quarter (green added, red trimmed, blue new). Rows split across managers or share classes are combined. Click a box for the stock.
Sector mix
% of 13F valueSectors from each company's SIC code; funds and ETFs grouped separately.
Biggest buys and sells
Q2 26 → Q3 26Estimated from the change in shares held × the quarter-end price, so price moves alone don't count as buying. New and exited positions are included.
13F assets and positions
4 quartersTotal reported 13F value (bars) and number of positions (line) each quarter. Value changes include market moves.
Top positions over time
reported valueThe eight largest current positions, valued at each quarter end.
Concentration
top 10 = 67.6%Cumulative share of the portfolio held in the largest N positions.
As of the firm’s regulatory filing dated Mar 18, 2026.
SUITE 4075
CHICAGO, IL 60606
| Name | Title / Status | Ownership | Type |
|---|---|---|---|
| HAGEDORN, JAMES, GERARD Control | MANAGING MEMBER since Aug 2008 | 75% or more | Individual |
| HAGEDORN, JAMES, GERARD Control | CHIEF COMPLIANCE OFFICER since Aug 2008 | 75% or more | Individual |
| GUIDO, NICHOLAS, A | PARTNER AND CHIEF OPERATING OFFICER since Sep 2021 | Less than 5% | Individual |
| HALPIN, ANTHONY, JOSEPH | FOUNDING PARTNER AND CHIEF FINANCIAL OFFICER since Jan 2012 | Less than 5% | Individual |
Ownership & leadership changes · 5 filings with changes since Mar 27, 2012
From the firm’s regulatory filings, newest first. Dates are filing dates: a filing that no longer lists someone does not say when they left.
- ChangedGUIDO, NICHOLAS, A · title PARTNER → PARTNER AND CHIEF OPERATING OFFICER
- ChangedHALPIN, ANTHONY, JOSEPH · title FOUNDING PARTNER → FOUNDING PARTNER AND CHIEF FINANCIAL OFFICER
- ChangedHALPIN, ANTHONY, JOSEPH · title COO → FOUNDING PARTNER
- AddedGUIDO, NICHOLAS, A · PARTNER · Less than 5%
- AddedHALPIN, ANTHONY, JOSEPH · COO · Less than 5%
- No longer listedO'CONNOR, MICHAEL, PHILIP · PARTNER · Less than 5% · listed since Jun 2017
- AddedO'CONNOR, MICHAEL, PHILIP · PARTNER · Less than 5%
- ListedHAGEDORN, JAMES, GERARD · CHIEF COMPLIANCE OFFICER / MANAGING MEMBER · 75% or more · control person
Quarter-over-quarter changes
Changes in reported position value vs the prior 13F, so price moves count too, not just shares bought or sold.
Top Adds (vs prior quarter)
- PAR TECHNOLOGY CORP$4.8M +449.3%
- THE REALREAL INC$2.2M +46.4%
- RAPID7 INC$2.0M +31.8%
- HEWLETT PACKARD ENTERPRISE C$1.6M +41.4%
- VERITONE INC$1.6M +28.8%
New Positions
- ATKORE INC$9.4M
- LITHIUM ARGENTINA AG$7.0M
- ENOVIS CORPORATION$6.3M
- INTEGER HLDGS CORP$5.5M
- WINNEBAGO INDS INC$5.3M
Exited Positions
- NUVALENT INC$11.1M
- APOGEE THERAPEUTICS INC$9.8M
- CHART INDS INC$8.4M
- BANDWIDTH INC$7.6M
- TAYLOR MORRISON HOME CORP$7.2M
Chicago Capital Management, LLC Holdings (2026-09-30)
Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).
| # | Issuer | Symbol | CUSIP | Value | Weight | Shares | Type |
|---|---|---|---|---|---|---|---|
| 1 | ATKORE INC | ATKR | 047649108 | $9.4M | 8.54% | 130,451 | SH |
| 2 | RAPID7 INC | RPD | 753422AF1 | $8.3M | 7.53% | 8,520 | PRN |
| 3 | LITHIUM ARGENTINA AG | LAR | 53680QAA6 | $7.0M | 6.36% | 7,126 | PRN |
| 4 | THE REALREAL INC | REAL | 88339PAD3 | $7.0M | 6.34% | 7,557 | PRN |
| 5 | VERITONE INC | VERI | 92347MAB6 | $6.9M | 6.29% | 7,000 | PRN |
| 6 | ENOVIS CORPORATION | ENOV | 194014AB2 | $6.3M | 5.74% | 6,500 | PRN |
| 7 | MGP INGREDIENTS INC NEW | MGPI | 55303JAB2 | $5.9M | 5.37% | 6,070 | PRN |
| 8 | PAR TECHNOLOGY CORP | PAR | 698884AE3 | $5.9M | 5.34% | 6,127 | PRN |
| 9 | INTEGER HLDGS CORP | ITGR | 45826H109 | $5.5M | 5.00% | 57,359 | SH |
| 10 | HEWLETT PACKARD ENTERPRISE C | HPEPC | 42824C208 | $5.4M | 4.87% | 32,900 | SH |
| 11 | WINNEBAGO INDS INC | WGO | 974637AF7 | $5.3M | 4.83% | 5,950 | PRN |
| 12 | AMPHASTAR PHARMACEUTICALS IN | AMPH | 03209RAB9 | $5.1M | 4.65% | 5,500 | PRN |
| 13 | EURONET WORLDWIDE INC | EEFT | 298736AL3 | $4.5M | 4.12% | 5,124 | PRN |
| 14 | MARINEMAX INC | HZO | 567908108 | $4.2M | 3.84% | 106,294 | SH |
| 15 | SAREPTA THERAPEUTICS INC | SRPT | 803607AD2 | $4.1M | 3.72% | 4,265 | PRN |
| 16 | SHAKE SHACK INC | SHAK | 819047AB7 | $4.0M | 3.58% | 4,193 | PRN |
| 17 | ETSY INC | ETSY | 29786AAN6 | $3.9M | 3.57% | 4,292 | PRN |
| 18 | RAPID7 INC | RPD | 753422AH7 | $3.6M | 3.23% | 4,010 | PRN |
| 19 | PAR TECHNOLOGY CORP | PAR | 698884AH6 | $3.3M | 3.01% | 4,000 | PRN |
| 20 | XEROX HOLDINGS CORP | XRXDW | 98421MAE6 | $2.0M | 1.78% | 5,000 | PRN |
| 21 | SHIFT4 PMTS INC | FOURPA | 82452J307 | $1.2M | 1.12% | 25,100 | SH |
| 22 | SOUTHERN CO | SOMN | 842587842 | $451.9K | 0.41% | 10,100 | SH |
| 23 | NSTS BANCORP INC | NSTS | 6293JP109 | $314.8K | 0.29% | 29,020 | SH |
| 24 | ACV AUCTIONS INC | ACVA | 00091G104 | $264.5K | 0.24% | 33,216 | SH |
| 25 | BIOLIFE SOLUTIONS INC | BLFS | 09062W204 | $222.6K | 0.20% | 7,524 | SH |
| 26 | XEROX HOLDINGS CORP | XRXDW | 98421M114 | $26.5K | 0.02% | 95,980 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-09-30 | 2026-10-21 | $110.4M | 26 | 0001062993-26-005464 |
| 2026-06-30 | 2026-07-22 | $112.3M | 27 | 0001062993-26-003767 |
| 2026-03-31 | 2026-04-27 | $120.7M | 29 | 0001062993-26-002171 |
| 2025-12-31 | 2026-02-02 | $146.9M | 43 | 0001062993-26-000528 |
SUITE 6025
CHICAGO, IL 60606