MANGROVE PARTNERS IM, LLC — 13F Holdings & Portfolio
CIK 1535392 · latest 13F-HR filed 2026-08-14
MANGROVE PARTNERS IM, LLC manages $1.52B in 13F-reported U.S. long-equity assets across 426 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are INDV (7.22%), VISN (6.01%), ATMU (4.06%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 199 new positions and exited 200; 93 existing positions rose in reported value and 58 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
$1.52B
Long-equity book
Holdings
426
Distinct positions
Period
2026-06-30
Filed 2026-08-14
Q/Q Activity
+199 / −200 / ↑93 / ↓58
vs 2026-03-31
Portfolio charts
Latest quarter's book, what changed, and how the portfolio has evolved across filings.
Portfolio map
Q2 26INDV7.2% · -2%VISN6.0% · +59843%ATMU4.1% · -8%FLYW3.4% · -1%TIGO3.3% · 0%REX3.0% · 0%KDP2.9% · 0%MRP2.7% · 0%ACHC2.7% · newPCG2.7% · 0%UNP2.6% · 0%OKE2.6% · 0%CODI2.6% · 0%APTV2.5% · +1924%GPC2.5% · 0%BIO2.5% · +0%OTEX2.4% · +65%ETH2.2% · -37%BELFA2.0% · +8106%BILL2.0% · 0%NWSA1.9% · 0%IWM1.8% · newFIS1.7% · 0%AIV0.9% · newDGAC.U0.5% · newHAVA0.5% · 0%QLEP0.5% · newGEF0.5% · newCTAAU0.4% · 0%ARCLU0.4% · newKTWO0.4% · 0%BREZ0.4% · newCIG0.4% · 0%VECA.U0.3% · newEMIS0.3% · 0%OTAI.U0.3% · newLWAC0.3% · 0%AXIN0.3% · -49%KFII0.3% · 0%COPL0.3% · 0%CCAQ0.3% · newSZZL0.3% · 0%TVAI0.3% · 0%OYSE0.3% · 0%SPEG0.3% · 0%INAC0.3% · 0%AIIA0.3% · 0%PACH0.3% · 0%RFAM0.3% · 0%VNME0.3% · 0%CMII0.3% · 0%PLUN.U0.3% · newLATA0.3% · 0%MYXXU0.3% · newIRHO0.3% · 0%JABRU0.3% · newSCII0.3% · 0%IGAC0.3% · 0%SSAC0.3% · 0%XFLH0.3% · new
Box 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 = 38.1%Cumulative share of the portfolio held in the largest N positions.
Firm Profile & Key People
As of the firm’s regulatory filing dated Mar 31, 2026.
Assets Under Management
$2.71B
Discretionary
$2.71B
Employees
19
Accounts
4
Address
2 SOUND VIEW DRIVE
3RD FLOOR
GREENWICH, CT 06830
3RD FLOOR
GREENWICH, CT 06830
Phone
(212) 897-9535
Website
This firm reports 2 disclosure items on its registration.
| Name | Title / Status | Ownership | Type |
|---|---|---|---|
| AUGUST, NATHANIEL, HALL Control | PRESIDENT since Apr 2010 | Less than 5% | Individual |
| DIETRICH, WARD, THOMAS Control | CHIEF OPERATING OFFICER, CHIEF COMPLIANCE OFFICER since Jan 2012 | Less than 5% | Individual |
| MANGROVE HOLDING, INC. Control | SOLE MEMBER since Mar 2024 | 75% or more | Domestic Entity |
| MANGROVE RETIREMENT SAVINGS PLAN Control Indirect owner via MANGROVE HOLDING, INC. | OWNER since Mar 2024 | 75% or more | Domestic Entity |
Ownership & leadership changes · 10 filings with changes since Mar 30, 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.
Mar 28, 2024 filing
- No longer listedLEE, PHILIP, SAN · SENIOR ANALYST · 10–25% · listed since Jan 2012
- No longer listedROSS, CAMERON, ROBERT · PARTNER, SENIOR ANALYST · 5–10% · listed since Jan 2022
- AddedMANGROVE HOLDING, INC. · SOLE MEMBER · 75% or more · control person
- AddedMANGROVE RETIREMENT SAVINGS PLAN · OWNER · 75% or more · indirect via MANGROVE HOLDING, INC. · control person
- ChangedAUGUST, NATHANIEL, HALL · ownership 50–75% → Less than 5%
- ChangedDIETRICH, WARD, THOMAS · ownership 10–25% → Less than 5%
Mar 30, 2023 filing
- AddedROSS, CAMERON, ROBERT · PARTNER, SENIOR ANALYST · 5–10%
Mar 31, 2022 filing
- No longer listedKALICKA, JEFFREY, STEVEN · SENIOR ANALYST · 10–25% · listed since Jan 2011
Mar 31, 2021 filing
- No longer listedPalese, Kimberly, Lynn-Marie · CHIEF FINANCIAL OFFICER · Less than 5% · control person · listed since Jan 2018
- No longer listedSTECK, BRIAN, GERARD · SENIOR ANALYST · 5–10% · listed since Jan 2013
- ChangedDIETRICH, WARD, THOMAS · ownership 5–10% → 10–25%
- ChangedLEE, PHILIP, SAN · ownership 5–10% → 10–25%
Mar 29, 2019 filing
- ChangedDIETRICH, WARD, THOMAS · ownership 10–25% → 5–10%
- ChangedLEE, PHILIP, SAN · ownership 10–25% → 5–10%
- ChangedSTECK, BRIAN, GERARD · ownership 10–25% → 5–10%
Mar 27, 2018 filing
- AddedPalese, Kimberly, Lynn-Marie · CHIEF FINANCIAL OFFICER · Less than 5% · control person
Mar 29, 2017 filing
- No longer listedMANGROVE CAPITAL · GENERAL PARTNER - THE MANGROVE PARTNERS FUND, L.P. · Less than 5% · listed since Apr 2010
- ChangedAUGUST, NATHANIEL, HALL · title PRESIDENT / PRESIDENT - MANGROVE CAPITAL → PRESIDENT
- ChangedDIETRICH, WARD, THOMAS · title CHIEF OPERATING OFFICER - MANGROVE CAPITAL / CHIEF OPERATING OFFICER, CHIEF COMPLIANCE OFFICER → CHIEF OPERATING OFFICER, CHIEF COMPLIANCE OFFICER
- ChangedKALICKA, JEFFREY, STEVEN · title SENIOR ANALYST / SENIOR ANALYST - MANGROVE CAPITAL → SENIOR ANALYST
- ChangedLEE, PHILIP, SAN · title SENIOR ANALYST / SENIOR ANALYST - MANGROVE CAPITAL → SENIOR ANALYST
- ChangedSTECK, BRIAN, GERARD · title SENIOR ANALYST / SENIOR ANALYST - MANGROVE CAPITAL → SENIOR ANALYST
Mar 27, 2015 filing
- ChangedKALICKA, JEFFREY, STEVEN · title DIRECTOR OF RESEARCH / DIRECTOR OF RESEARCH - MANGROVE CAPITAL → SENIOR ANALYST / SENIOR ANALYST - MANGROVE CAPITAL
- ChangedSTECK, BRIAN, GERARD · title MANAGING DIRECTOR / MANAGING DIRECTOR - MANGROVE CAPITAL → SENIOR ANALYST / SENIOR ANALYST - MANGROVE CAPITAL
May 10, 2013 filing
- ChangedDIETRICH, WARD, THOMAS · title CHIEF OPERATING OFFICER / CHIEF OPERATING OFFICER - MANGROVE CAPITAL → CHIEF OPERATING OFFICER - MANGROVE CAPITAL / CHIEF OPERATING OFFICER, CHIEF COMPLIANCE OFFICER
- ChangedKALICKA, JEFFREY, STEVEN · no longer a control person
Mar 28, 2013 filing
- AddedLEE, PHILIP, SAN · SENIOR ANALYST / SENIOR ANALYST - MANGROVE CAPITAL · 10–25%
- AddedSTECK, BRIAN, GERARD · MANAGING DIRECTOR / MANAGING DIRECTOR - MANGROVE CAPITAL · 10–25%
- ChangedAUGUST, NATHANIEL, HALL · ownership 75% or more → 50–75%
- ChangedDIETRICH, WARD, THOMAS · ownership Less than 5% → 10–25%
Older changes (1 more filing)
Mar 30, 2012 filing (earliest on record)
- ListedAUGUST, NATHANIEL, HALL · PRESIDENT / PRESIDENT - MANGROVE CAPITAL · 75% or more · control person
- ListedDIETRICH, WARD, THOMAS · CHIEF OPERATING OFFICER / CHIEF OPERATING OFFICER - MANGROVE CAPITAL · Less than 5% · control person
- ListedKALICKA, JEFFREY, STEVEN · DIRECTOR OF RESEARCH / DIRECTOR OF RESEARCH - MANGROVE CAPITAL · 10–25% · control person
- ListedMANGROVE CAPITAL · GENERAL PARTNER - THE MANGROVE PARTNERS FUND, L.P. · Less than 5%
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)
- VISTANCE NETWORKS INC$91.3M +41992.2%
- BEL FUSE INC$30.3M +13161.8%
- INDIVIOR PHARMACEUTICALS INC$26.2M +31.4%
- FLYWIRE CORPORATION$17.3M +49.4%
- OPEN TEXT CORP$14.2M +64.1%
Top Trims
- ENOVA INTL INC-$38.6M -99.3%
- GRAYSCALE ETHEREUM STAKING-$37.0M -52.4%
- ATMUS FILTRATION TECHNOLOGIE-$12.9M -17.3%
- FIDELITY NATL INFORMATION SV-$5.3M -17.1%
- AXIOM INTELLIGENCE AC CORP 1-$4.4M -47.9%
New Positions
- ACADIA HEALTHCARE COMPANY IN$41.2M
- APTIV PLC$37.7M
- ISHARES TR$27.7M
- APARTMENT INVT & MGMT CO$13.2M
- DISCIPLINED GROWTH$7.5M
Exited Positions
- TRIPADVISOR INC$10.3M
- BITWISE SOLANA STAKING ETF$8.5M
- VOYAGER ACQUISITION CORP$5.4M
- FACT II ACQUISITION CORP$4.6M
- A PARADISE ACQUISITION CORP$4.6M
MANGROVE PARTNERS IM, 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 | INDIVIOR PHARMACEUTICALS INC | INDV | 45579U109 | $109.8M | 7.22% | 2,676,730 | SH |
| 2 | VISTANCE NETWORKS INC | VISN | 20337X109 | $91.5M | 6.01% | 7,158,439 | SH |
| 3 | ATMUS FILTRATION TECHNOLOGIE | ATMU | 04956D107 | $61.8M | 4.06% | 1,211,236 | SH |
| 4 | FLYWIRE CORPORATION | FLYW | 302492103 | $52.4M | 3.44% | 2,984,076 | SH |
| 5 | MILLICOM INTL CELLULAR S A | TIGO | L6388F110 | $50.5M | 3.32% | 556,485 | SH |
| 6 | REX AMERICAN RES CORP | REX | 761624105 | $45.8M | 3.01% | 1,015,234 | SH |
| 7 | KEURIG DR PEPPER INC | KDP | 49271V100 | $44.7M | 2.93% | 1,364,682 | SH |
| 8 | MILLROSE PPTYS INC | MRP | 601137102 | $41.5M | 2.73% | 1,380,992 | SH |
| 9 | ACADIA HEALTHCARE COMPANY IN | ACHC | 00404A109 | $41.2M | 2.71% | 1,396,059 | SH |
| 10 | PG&E CORP | PCG | 69331C108 | $40.6M | 2.67% | 2,413,615 | SH |
| 11 | UNION PAC CORP | UNP | 907818108 | $40.3M | 2.65% | 148,098 | SH |
| 12 | ONEOK INC NEW | OKE | 682680103 | $40.1M | 2.64% | 461,743 | SH |
| 13 | COMPASS DIVERSIFIED | CODI | 20451Q104 | $39.3M | 2.58% | 3,684,800 | SH |
| 14 | APTIV PLC | APTV | G3265R107 | $37.7M | 2.47% | 613,392 | SH |
| 15 | GENUINE PARTS CO | GPC | 372460105 | $37.4M | 2.46% | 316,771 | SH |
| 16 | BIO RAD LABS INC | BIO | 090572207 | $37.3M | 2.45% | 127,191 | SH |
| 17 | OPEN TEXT CORP | OTEX | 683715106 | $36.3M | 2.38% | 1,637,946 | SH |
| 18 | GRAYSCALE ETHEREUM STAKING | ETH | 38964R203 | $33.6M | 2.20% | 2,232,656 | SH |
| 19 | BEL FUSE INC | BELFA | 077347201 | $30.5M | 2.00% | 104,706 | SH |
| 20 | BILL HOLDINGS INC | BILL | 090043100 | $30.3M | 1.99% | 838,994 | SH |
| 21 | NEWS CORP NEW | NWSA | 65249B109 | $29.6M | 1.94% | 1,191,858 | SH |
| 22 | ISHARES TR | IWM | 464287655 | $27.7M | 1.82% | 92,192 | SH |
| 23 | FIDELITY NATL INFORMATION SV | FIS | 31620M106 | $25.6M | 1.68% | 657,673 | SH |
| 24 | APARTMENT INVT & MGMT CO | AIV | 03748R747 | $13.2M | 0.87% | 4,459,396 | SH |
| 25 | DISCIPLINED GROWTH | DGAC.U | G2775W127 | $7.5M | 0.49% | 749,995 | SH |
| 26 | HARVARD AVE ACQUISITION CORP | HAVA | G4330A103 | $7.5M | 0.49% | 740,600 | SH |
| 27 | QUANTUM LEAP ACQUISITION COR | QLEP | G73167101 | $7.4M | 0.49% | 750,000 | SH |
| 28 | GREIF INC | GEF | 397624107 | $7.3M | 0.48% | 97,567 | SH |
| 29 | CLEARTHINK 1 ACQUISITION COR | CTAAU | G2294A127 | $6.1M | 0.40% | 605,000 | SH |
| 30 | ARC GROUP ACQUISITION I CORP | ARCLU | G24498100 | $5.9M | 0.39% | 575,000 | SH |
| 31 | K2 CAP ACQUISITION CORP | KTWO | G5226B105 | $5.9M | 0.39% | 590,000 | SH |
| 32 | BREEZE ACQUISITION CORP II | BREZ | G13227106 | $5.7M | 0.37% | 575,000 | SH |
| 33 | CIA ENERGETICA DE MINAS GERA | CIG | 204409601 | $5.5M | 0.36% | 2,625,000 | SH |
| 34 | VERNAL CAP ACQUISITION CORP | VECA.U | G93Y7F122 | $5.2M | 0.34% | 490,000 | SH |
| 35 | EMMIS ACQUISITION CORP. | EMIS | G3037D105 | $5.1M | 0.33% | 500,000 | SH |
| 36 | STARLINK AI ACQUISITION CORP | OTAI.U | G8443M128 | $5.1M | 0.33% | 499,990 | SH |
| 37 | LIGHTWAVE ACQUISITION CORP | LWAC | G5490M100 | $5.0M | 0.33% | 486,900 | SH |
| 38 | AXIOM INTELLIGENCE AC CORP 1 | AXIN | G0750N104 | $4.7M | 0.31% | 459,340 | SH |
| 39 | K&F GROWTH ACQUISITION CORP | KFII | G52258111 | $4.7M | 0.31% | 450,000 | SH |
| 40 | COPLEY ACQUISITION CORP | COPL | G24243100 | $4.7M | 0.31% | 450,000 | SH |
| 41 | COLLECTIVE ACQUISITION CORP | CCAQ | G2867S109 | $4.7M | 0.31% | 449,995 | SH |
| 42 | SIZZLE ACQUISITION CORP. II | SZZL | G8193F109 | $4.7M | 0.31% | 450,000 | SH |
| 43 | THAYER VENTURES ACQ CORP II | TVAI | G87890102 | $4.6M | 0.31% | 450,000 | SH |
| 44 | OYSTER ENTERPRISES II ACQUIS | OYSE | G6861F104 | $4.6M | 0.30% | 450,000 | SH |
| 45 | SILVER PEGASUS ACQUISITION C | SPEG | G8192J102 | $4.6M | 0.30% | 450,000 | SH |
| 46 | INDIGO ACQUISITION CORP | INAC | G4791J106 | $4.6M | 0.30% | 450,000 | SH |
| 47 | AI INFRASTRUCTURE ACQUISI | AIIA | G01336109 | $4.6M | 0.30% | 450,000 | SH |
| 48 | PIONEER ACQUISITION I CORP | PACH | G7117W107 | $4.6M | 0.30% | 450,000 | SH |
| 49 | RF ACQUISITION CORP III | RFAM | G7537X107 | $4.6M | 0.30% | 465,000 | SH |
| 50 | VENDOME ACQUISITION CORP I | VNME | G9580A109 | $4.6M | 0.30% | 450,000 | SH |
Filing History
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-06-30 | 2026-08-14 | $1.52B | 426 | 0001172661-26-003546 |
| 2026-03-31 | 2026-05-15 | $1.24B | 427 | 0001172661-26-002101 |
| 2025-12-31 | 2026-02-17 | $1.23B | 371 | 0001172661-26-000828 |
| 2025-09-30 | 2025-11-14 | $1.35B | 178 | 0001172661-25-004806 |
Filer Information
Address
2 SOUND VIEW DRIVEGREENWICH, CT 06830
Phone
(212) 897-9535
Filing Manager
MANGROVE PARTNERS IM, LLC
Greenwich, CT
Signatory
Ward T. Dietrich
Chief Operating Officer