GRIZZLYROCK CAPITAL, LLC — 13F Holdings & Portfolio
CIK 2011732 · latest 13F-HR filed 2026-08-14
GRIZZLYROCK CAPITAL, LLC manages $143.0M in 13F-reported U.S. long-equity assets across 20 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are MGNI (15.46%), EEFT (10.47%), AMN (9.04%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 4 new positions and exited 2; 7 existing positions rose in reported value and 6 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.
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AUM
$143.0M
Long-equity book
Holdings
20
Distinct positions
Period
2026-06-30
Filed 2026-08-14
Q/Q Activity
+4 / −2 / ↑7 / ↓6
vs 2026-03-31
Portfolio charts
Latest quarter's book, what changed, and how the portfolio has evolved across filings.
Portfolio map
Q2 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
Q1 26 → Q2 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 = 76.6%Cumulative share of the portfolio held in the largest N positions.
Firm Profile & Key People
As of the firm’s regulatory filing dated Mar 27, 2026.
Assets Under Management
$192.7M
Discretionary
$192.7M
Employees
2
Accounts
5
Address
440 N WELLS STREET
SUITE 260
CHICAGO, IL 60654
SUITE 260
CHICAGO, IL 60654
Phone
(312) 605-6317
| Name | Title / Status | Ownership | Type |
|---|---|---|---|
| MOWERY, KYLE, HARRIS Control | CHIEF COMPLIANCE OFFICER / MANAGER / CLASS A-1 MEMBER since Dec 2020 | 50–75% | Individual |
| CONWAY, WILLIAM, E. | CLASS A-3 MEMBER since Dec 2020 | 5–10% | Individual |
| DANIEL ASHER DESCENDANT'S TRUST | MEMBER since Mar 2022 | Less than 5% | Domestic Entity |
| Holt, Michael, Timothy | MEMBER since Jan 2024 | 10–25% | Individual |
| LAUX, DOUG | MEMBER since Dec 2020 | Less than 5% | Individual |
| DANIEL ASHER Indirect owner via DANIEL ASHER DESCENDANT'S TRUST | TRUSTEE since Mar 2022 | General partner, trustee or manager | Domestic Entity |
Ownership & leadership changes · 11 filings with changes since May 15, 2015
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.
Mar 27, 2025 filing
- AddedHolt, Michael, Timothy · MEMBER · 10–25%
- ChangedCONWAY, WILLIAM, E. · ownership 10–25% → 5–10%
- ChangedMOWERY, KYLE, HARRIS · ownership 75% or more → 50–75%
Mar 3, 2023 filing
- ChangedMOWERY, KYLE, HARRIS · title CHIEF COMPLIANCE OFFICER / CHIEF COMPLIANCE OFFICER / MANAGER / CLASS A-1 MEMBER / CLASS A-1 MEMBER / MANAGER → CHIEF COMPLIANCE OFFICER / MANAGER / CLASS A-1 MEMBER
Jun 22, 2022 filing
- AddedDANIEL ASHER · TRUSTEE · General partner, trustee or manager · indirect via DANIEL ASHER DESCENDANT'S TRUST
- ChangedMOWERY, KYLE, HARRIS · title MANAGER / CLASS A-1 MEMBER → CHIEF COMPLIANCE OFFICER / CHIEF COMPLIANCE OFFICER / MANAGER / CLASS A-1 MEMBER / CLASS A-1 MEMBER / MANAGER
Mar 29, 2022 filing
- AddedDANIEL ASHER DESCENDANT'S TRUST · MEMBER · Less than 5%
- ChangedMOWERY, KYLE, HARRIS · title CHIEF COMPLIANCE OFFICER / CLASS A-1 MEMBER / MANAGER → MANAGER / CLASS A-1 MEMBER; ownership 50–75% → 75% or more
Mar 26, 2021 filing
- No longer listedAAJ VENTURES INC. · MEMBER · 25–50% · indirect via VIVALDI HOLDINGS, LLC · control person · listed since Dec 2014
- No longer listedBASSEWITZ, MARC, D · BOARD MEMBER · General partner, trustee or manager · indirect via WHI TRUST COMPANY, LLC · control person · listed since Oct 2017
- No longer listedDANIEL ASHER DESCENDANTS TRUST · CLASS B MEMBER · Less than 5% · listed since May 2015
- No longer listedFRANK, ROXANNE, HARRIS · SETTLOR · General partner, trustee or manager · indirect via RATA VOTING TRUST · control person · listed since Oct 2017
- No longer listedGEITTMANN, CLAY, DANIEL · BOARD MEMBER · General partner, trustee or manager · indirect via WHI TRUST COMPANY, LLC · control person · listed since Oct 2017
- No longer listedGOLDMAN, FRED, OWEN · TRUSTEE · General partner, trustee or manager · indirect via DANIEL ASHER DESCENDANTS TRUST · control person · listed since Jul 2007
- No longer listedLANGSAM, ADAM, BLAKE · BOARD MEMBER · General partner, trustee or manager · indirect via WHI TRUST COMPANY, LLC · control person · listed since Oct 2017
- No longer listedMCQUINN, MICHAEL, CHRISTOPHER · TRUSTEE · General partner, trustee or manager · indirect via VIRGINIA H POLSKY TRUST · control person · listed since Dec 2015
- No longer listedMCQUINN, MICHAEL, CHRISTOPHER · BOARD MEMBER · General partner, trustee or manager · indirect via WHI TRUST COMPANY, LLC · control person · listed since Oct 2017
- No longer listedPOLSKY, CHARLES, V. · BOARD MEMBER · General partner, trustee or manager · indirect via WHI TRUST COMPANY, LLC · control person · listed since Oct 2017
- No longer listedPOLSKY, VIRGINIA, HARRIS · TRUSTEE · General partner, trustee or manager · indirect via VIRGINIA H POLSKY TRUST · control person · listed since Jun 1996
- No longer listedPOLSKY, VIRGINIA, HARRIS · SETTLOR · General partner, trustee or manager · indirect via WISHBONE VOTING TRUST · control person · listed since Oct 2017
- No longer listedRATA VOTING TRUST · MEMBER · 50–75% · indirect via WHI TRUST COMPANY, LLC · control person · listed since Oct 2017
- No longer listedROXANNE H FRANK TRUST · SHAREHOLDER · 25–50% · indirect via WILLIAM HARRIS INVESTORS, INC. · control person · listed since Dec 1997
- No longer listedSTERNBERG, DAVID, ALAN · OWNER · 75% or more · indirect via AAJ VENTURES INC. · control person · listed since Dec 2011
- No longer listedVIRGINIA H POLSKY TRUST · SHAREHOLDER · 25–50% · indirect via WILLIAM HARRIS INVESTORS, INC. · control person · listed since Dec 1997
- No longer listedVIVALDI HOLDINGS, LLC · MEMBER · 50–75% · indirect via WV INVESTORS, LLC · control person · listed since Feb 2015
- No longer listedWHI MULTI-STRATEGY FUND, LLC · CLASS B MEMBER · Less than 5% · listed since May 2015
- No longer listedWHI SPECIAL OPPORTUNITIES FUND, LLC · CLASS B MEMBER · Less than 5% · listed since Oct 2018
- No longer listedWHI TRUST COMPANY, LLC · TRUSTEE · General partner, trustee or manager · indirect via ROXANNE H FRANK TRUST · control person · listed since Apr 2018
- No longer listedWILLIAM HARRIS INVESTORS, INC. · MEMBER · 50–75% · indirect via WV INVESTORS, LLC · control person · listed since Feb 2015
- No longer listedWISHBONE VOTING TRUST · MEMBER · 50–75% · indirect via WHI TRUST COMPANY, LLC · control person · listed since Oct 2017
- No longer listedWOLF, ANN MARIE, C. · CHIEF FINANCIAL OFFICER · Less than 5% · listed since Jun 2015
- No longer listedWV INVESTORS, LLC · CLASS B MEMBER · 5–10% · listed since May 2015
- AddedLAUX, DOUG · MEMBER · Less than 5%
Aug 6, 2020 filing
- No longer listedBASSEWITZ, MARC, D · CHIEF COMPLIANCE OFFICER · Less than 5% · listed since Jun 2015
- ChangedMOWERY, KYLE, HARRIS · title MANAGER / CLASS A-1 MEMBER → CHIEF COMPLIANCE OFFICER / CLASS A-1 MEMBER / MANAGER
Feb 6, 2019 filing
- No longer listedFRANK, ROXANNE, HARRIS · TRUSTEE · General partner, trustee or manager · indirect via ROXANNE H FRANK TRUST · control person · listed since Apr 1996
- No longer listedSTEPHENS, MARY BETH · TRUSTEE · General partner, trustee or manager · indirect via ROXANNE H FRANK TRUST · control person · listed since Dec 2015
- No longer listedWHI SPECIAL INVESTMENTS, LLC · CLASS B MEMBER · Less than 5% · listed since May 2015
- AddedBASSEWITZ, MARC, D · BOARD MEMBER · General partner, trustee or manager · indirect via WHI TRUST COMPANY, LLC · control person
- AddedFRANK, ROXANNE, HARRIS · SETTLOR · General partner, trustee or manager · indirect via RATA VOTING TRUST · control person
- AddedGEITTMANN, CLAY, DANIEL · BOARD MEMBER · General partner, trustee or manager · indirect via WHI TRUST COMPANY, LLC · control person
- AddedLANGSAM, ADAM, BLAKE · BOARD MEMBER · General partner, trustee or manager · indirect via WHI TRUST COMPANY, LLC · control person
- AddedMCQUINN, MICHAEL, CHRISTOPHER · BOARD MEMBER · General partner, trustee or manager · indirect via WHI TRUST COMPANY, LLC · control person
- AddedPOLSKY, CHARLES, V. · BOARD MEMBER · General partner, trustee or manager · indirect via WHI TRUST COMPANY, LLC · control person
- AddedPOLSKY, VIRGINIA, HARRIS · SETTLOR · General partner, trustee or manager · indirect via WISHBONE VOTING TRUST · control person
- AddedRATA VOTING TRUST · MEMBER · 50–75% · indirect via WHI TRUST COMPANY, LLC · control person
- AddedWHI SPECIAL OPPORTUNITIES FUND, LLC · CLASS B MEMBER · Less than 5%
- AddedWHI TRUST COMPANY, LLC · TRUSTEE · General partner, trustee or manager · indirect via ROXANNE H FRANK TRUST · control person
- AddedWISHBONE VOTING TRUST · MEMBER · 50–75% · indirect via WHI TRUST COMPANY, LLC · control person
Mar 6, 2018 filing
- No longer listedAAJ VERNTURES INC. · MEMBER · 25–50% · indirect via VIVALDI HOLDINGS, LLC · control person · listed since Dec 2014
- AddedAAJ VENTURES INC. · MEMBER · 25–50% · indirect via VIVALDI HOLDINGS, LLC · control person
May 1, 2017 filing
- AddedCONWAY, WILLIAM, E. · CLASS A-3 MEMBER · 10–25%
- ChangedMOWERY, KYLE, HARRIS · ownership 75% or more → 50–75%
Mar 2, 2017 filing
- No longer listedGOLDEN, RANDAL, LAWRENCE · OWNER · 75% or more · indirect via H/E VENTURES, INC. · control person · listed since Dec 2011
- No longer listedH/E VENTURES INC. · MEMBER · 25–50% · indirect via VIVALDI HOLDINGS, LLC · control person · listed since Dec 2014
Older changes (2 more filings)
Mar 9, 2016 filing
- AddedBASSEWITZ, MARC, D · CHIEF COMPLIANCE OFFICER · Less than 5%
- AddedFRANK, ROXANNE, HARRIS · TRUSTEE · General partner, trustee or manager · indirect via ROXANNE H FRANK TRUST · control person
- AddedMCQUINN, MICHAEL, CHRISTOPHER · TRUSTEE · General partner, trustee or manager · indirect via VIRGINIA H POLSKY TRUST · control person
- AddedPOLSKY, VIRGINIA, HARRIS · TRUSTEE · General partner, trustee or manager · indirect via VIRGINIA H POLSKY TRUST · control person
- AddedROXANNE H FRANK TRUST · SHAREHOLDER · 25–50% · indirect via WILLIAM HARRIS INVESTORS, INC. · control person
- AddedSTEPHENS, MARY BETH · TRUSTEE · General partner, trustee or manager · indirect via ROXANNE H FRANK TRUST · control person
- AddedVIRGINIA H POLSKY TRUST · SHAREHOLDER · 25–50% · indirect via WILLIAM HARRIS INVESTORS, INC. · control person
- AddedWOLF, ANN MARIE, C. · CHIEF FINANCIAL OFFICER · Less than 5%
May 15, 2015 filing (earliest on record)
- ListedAAJ VERNTURES INC. · MEMBER · 25–50% · indirect via VIVALDI HOLDINGS, LLC · control person
- ListedDANIEL ASHER DESCENDANTS TRUST · CLASS B MEMBER · Less than 5%
- ListedGOLDEN, RANDAL, LAWRENCE · OWNER · 75% or more · indirect via H/E VENTURES, INC. · control person
- ListedGOLDMAN, FRED, OWEN · TRUSTEE · General partner, trustee or manager · indirect via DANIEL ASHER DESCENDANTS TRUST · control person
- ListedH/E VENTURES INC. · MEMBER · 25–50% · indirect via VIVALDI HOLDINGS, LLC · control person
- ListedMOWERY, KYLE, HARRIS · MANAGER / CLASS A-1 MEMBER · 75% or more · control person
- ListedSTERNBERG, DAVID, ALAN · OWNER · 75% or more · indirect via AAJ VENTURES INC. · control person
- ListedVIVALDI HOLDINGS, LLC · MEMBER · 50–75% · indirect via WV INVESTORS, LLC · control person
- ListedWHI MULTI-STRATEGY FUND, LLC · CLASS B MEMBER · Less than 5%
- ListedWHI SPECIAL INVESTMENTS, LLC · CLASS B MEMBER · Less than 5%
- ListedWILLIAM HARRIS INVESTORS, INC. · MEMBER · 50–75% · indirect via WV INVESTORS, LLC · control person
- ListedWV INVESTORS, LLC · CLASS B MEMBER · 5–10%
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)
- MAGNITE INC$7.4M +50.2%
- POWERFLEET INC$5.6M +455.8%
- EURONET WORLDWIDE INC$3.9M +35.2%
- XPONENTIAL FITNESS INC$2.1M +35.4%
- JANUS INTERNATIONAL GROUP IN$1.4M +42.1%
Top Trims
- DRIVEN BRANDS HLDGS INC-$6.1M -41.3%
- OLIN CORP-$5.4M -40.8%
- FERROGLOBE PLC-$3.6M -24.2%
- LIFECORE BIOMEDICAL INC-$2.5M -82.4%
- AMENTUM HOLDINGS INC-$959.5K -12.7%
New Positions
- GLASS HOUSE BRANDS INC$7.9M
- COMPASS INC$5.2M
- CELSIUS HLDGS INC$2.8M
- FERMI INC$2.2M
GRIZZLYROCK CAPITAL, LLC Holdings (2026-06-30)
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 | MAGNITE INC | MGNI | 55955D100 | $22.1M | 15.46% | 1,164,628 | SH |
| 2 | EURONET WORLDWIDE INC | EEFT | 298736109 | $15.0M | 10.47% | 204,500 | SH |
| 3 | AMN HEALTHCARE SVCS INC | AMN | 001744101 | $12.9M | 9.04% | 399,286 | SH |
| 4 | FERROGLOBE PLC | GSM | G33856108 | $11.3M | 7.93% | 3,565,959 | SH |
| 5 | THE REAL BROKERAGE INC | REAX | 75585H206 | $8.8M | 6.18% | 4,858,289 | SH |
| 6 | DRIVEN BRANDS HLDGS INC | DRVN | 26210V102 | $8.7M | 6.06% | 621,971 | SH |
| 7 | XPONENTIAL FITNESS INC | XPOF | 98422X101 | $8.1M | 5.67% | 1,171,622 | SH |
| 8 | GLASS HOUSE BRANDS INC | GLAS | 377130406 | $7.9M | 5.55% | 611,000 | SH |
| 9 | OLIN CORP | OLN | 680665205 | $7.8M | 5.48% | 395,094 | SH |
| 10 | POWERFLEET INC | AIOT | 73931J109 | $6.9M | 4.81% | 1,794,303 | SH |
| 11 | AMENTUM HOLDINGS INC | AMTM | 023939101 | $6.6M | 4.60% | 318,363 | SH |
| 12 | RYERSON HLDG CORP | RYZ | 783754104 | $6.1M | 4.27% | 248,007 | SH |
| 13 | COMPASS INC | COMP | 20464U100 | $5.2M | 3.65% | 422,839 | SH |
| 14 | JANUS INTERNATIONAL GROUP IN | JBI | 47103N106 | $4.6M | 3.21% | 826,983 | SH |
| 15 | ACV AUCTIONS INC | ACVA | 00091G104 | $4.1M | 2.84% | 564,917 | SH |
| 16 | CELSIUS HLDGS INC | CELH | 15118V207 | $2.8M | 1.95% | 95,000 | SH |
| 17 | FERMI INC | FRMI | 314911108 | $2.2M | 1.56% | 243,500 | SH |
| 18 | GENESIS ENERGY L P | GEL | 371927104 | $701.6K | 0.49% | 49,515 | SH |
| 19 | ENERFLEX LTD | EFXT | 29269R105 | $588.2K | 0.41% | 24,000 | SH |
| 20 | LIFECORE BIOMEDICAL INC | LFCR | 514766104 | $540.8K | 0.38% | 103,000 | SH |
Filing History
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-06-30 | 2026-08-14 | $143.0M | 20 | 0001214659-26-010367 |
| 2026-03-31 | 2026-05-15 | $126.3M | 18 | 0001214659-26-006454 |
| 2025-12-31 | 2026-02-17 | $133.6M | 22 | 0001214659-26-001965 |
| 2025-09-30 | 2025-11-14 | $128.8M | 23 | 0001214659-25-016622 |
Filer Information
Address
440 N.WELLS STREETSUITE 260
CHICAGO, IL 60654
Phone
(312) 300-4983
Filing Manager
GRIZZLYROCK CAPITAL, LLC
CHICAGO, IL
Signatory
Kyle Mowery
Chief Compliance Officer