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Nantahala Capital Management, LLC — 13F Holdings & Portfolio

CIK 1472322 · latest 13F-HR filed 2026-08-14

Backtest portfolio

Nantahala Capital Management, LLC manages $3.00B in 13F-reported U.S. long-equity assets across 152 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are IWM (20.00%), PTON (3.23%), HLF (2.89%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 21 new positions and exited 22; 57 existing positions rose in reported value and 38 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
$3.00B

Long-equity book

Holdings
152

Distinct positions

Period
2026-06-30

Filed 2026-08-14

Q/Q Activity
+21 / −22 / ↑57 / ↓38

vs 2026-03-31

Portfolio charts

Latest quarter's book, what changed, and how the portfolio has evolved across filings.

Portfolio map

Q2 26
TBBK4.7% · -10%BVS3.4% · -2%HGV3.3% · -32%SVRA2.6% · -5%ETON2.6% · 0%AMRX2.4% · -20%EOLS2.3% · -12%AVTX2.1% · +51%LBRX2.1% · 0%AVR2.0% · -39%ABEO1.9% · +2%PTON1.8% · -57%ESTA1.7% · -60%XTNT1.7% · 0%JACK1.7% · +12%GOGO1.6% · -2%IMAX1.6% · +28%ZVRA1.6% · -29%TITN1.4% · -10%RMR1.4% · 0%FOSL1.4% · +2%FOXF1.3% · -12%MLYS1.3% · -8%RDNW1.3% · 0%QURE1.3% · +92%AURA1.3% · +39%AGMB1.2% · +31%FULC1.2% · +80%BNTC1.2% · +4%ADMA1.2% · newCWH1.2% · -22%BCRX1.1% · -4%MDXG1.1% · +40%ABVX1.1% · -2%USNA1.0% · 0%GLUE1.0% · 0%TNGX0.9% · -60%GERN0.9% · +9%VOR0.9% · newKROS0.9% · +4%SLN0.9% · -37%APYX0.9% · -5%JCAP0.9% · 0%HLF0.9% · -18%PLNT0.9% · newVSTM0.8% · 0%DSGR0.8% · 0%RYAM0.8% · +6%HLXC0.8% · 0%ADCT0.8% · +120%PCVX0.8% · -7%IRD0.8% · +82%JANX0.8% · 0%AMAN0.7% · newINSP0.7% · newFLWS0.7% · 0%XFOR0.7% · 0%ITGR0.6% · -35%IVA0.6% · newILPT0.6% · -34%

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 value

Sectors from each company's SIC code; funds and ETFs grouped separately.

Biggest buys and sells

Q1 26 → Q2 26

Estimated 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 quarters

Total reported 13F value (bars) and number of positions (line) each quarter. Value changes include market moves.

Top positions over time

reported value

The eight largest current positions, valued at each quarter end.

Concentration

top 10 = 27.4%

Cumulative share of the portfolio held in the largest N positions.

Firm Profile & Key People

As of the firm’s regulatory filing dated Sep 14, 2026.

Assets Under Management
$3.11B
Discretionary
$3.11B
Employees
14
Accounts
11
Address
130 MAIN ST.
2ND FLOOR
NEW CANAAN, CT 06840
Phone
(203) 909-6430
Website
Name Title / Status Ownership Type
Buba, Jonathan, Zanetos ControlMEMBER
since Nov 2016
10–25%Individual
HARKEY, WILMOT, B. ControlMANAGING MEMBER
since May 2004
25–50%Individual
MACK, DANIEL, J. ControlMANAGING MEMBER
since Jul 2007
25–50%Individual
VASILAKIS, DEMETRIOS (TAKI) ControlCHIEF COMPLIANCE OFFICER
since Jan 2022
Less than 5%Individual
ZHONG, QIANQIAN ControlCHIEF FINANCIAL OFFICER
since Apr 2018
Less than 5%Individual
Ownership & leadership changes · 8 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 30, 2023 filing
  • No longer listedREHM, PAUL · CHIEF OPERATING OFFICER · Less than 5% · control person · listed since Jan 2011
Feb 3, 2022 filing
  • AddedVASILAKIS, DEMETRIOS (TAKI) · CHIEF COMPLIANCE OFFICER · Less than 5% · control person
  • ChangedREHM, PAUL · title CHIEF OPERATING OFFICER / CHIEF COMPLIANCE OFFICER → CHIEF OPERATING OFFICER
Mar 31, 2019 filing
  • No longer listedBLOOM FAMILY LLC · MEMBER · 5–10% · listed since Jan 2017
  • No longer listedBLOOM, STEVEN, HARRIS · MANAGER · 50–75% · indirect via BLOOM FAMILY LLC · control person · listed since Sep 2012
  • No longer listedBloom, Susan, Rosen · MANAGER · General partner, trustee or manager · indirect via BLOOM FAMILY LLC · control person · listed since Sep 2012
Apr 13, 2018 filing
  • No longer listedBLOOM, STEVEN, HARRIS · MEMBER · 5–10% · listed since Oct 2008
  • No longer listedKING, THOMAS, E · CHIEF FINANCIAL OFFICER · Less than 5% · control person · listed since Aug 2012
  • AddedBLOOM FAMILY LLC · MEMBER · 5–10%
  • AddedBLOOM, STEVEN, HARRIS · MANAGER · 50–75% · indirect via BLOOM FAMILY LLC · control person
  • AddedBloom, Susan, Rosen · MANAGER · General partner, trustee or manager · indirect via BLOOM FAMILY LLC · control person
  • AddedZHONG, QIANQIAN · CHIEF FINANCIAL OFFICER · Less than 5% · control person
Mar 30, 2018 filing
  • ChangedBuba, Jonathan, Zanetos · now a control person
Dec 14, 2016 filing
  • AddedBuba, Jonathan, Zanetos · MEMBER · 10–25%
  • ChangedBLOOM, STEVEN, HARRIS · ownership 10–25% → 5–10%
Mar 30, 2016 filing
  • ChangedREHM, PAUL · title CHIEF COMPLIANCE OFFICER → CHIEF OPERATING OFFICER / CHIEF COMPLIANCE OFFICER
Mar 28, 2013 filing
  • AddedKING, THOMAS, E · CHIEF FINANCIAL OFFICER · Less than 5% · control person
  • ChangedREHM, PAUL · now a control person
Mar 30, 2012 filing (earliest on record)
  • ListedBLOOM, STEVEN, HARRIS · MEMBER · 10–25%
  • ListedHARKEY, WILMOT, B. · MANAGING MEMBER · 25–50% · control person
  • ListedMACK, DANIEL, J. · MANAGING MEMBER · 25–50% · control person
  • ListedREHM, PAUL · CHIEF COMPLIANCE OFFICER · 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.

Nantahala Capital Management, 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 ISHARES TR Put IWM 464287655 $600.9M 20.00% 2,000,000 SH
2 PELOTON INTERACTIVE INC Call PTON 70614W100 $97.2M 3.23% 16,438,900 SH
3 HERBALIFE LTD Call HLF G4412G101 $86.8M 2.89% 6,600,000 SH
4 VIATRIS INC Call VTRS 92556V106 $79.4M 2.64% 5,000,000 SH
5 BANCORP INC DEL TBBK 05969A105 $77.7M 2.59% 1,239,887 SH
6 EDWARDS LIFESCIENCES CORP Put EW 28176E108 $72.4M 2.41% 800,000 SH
7 SPDR SERIES TRUST Put XBI 78464A870 $63.3M 2.11% 400,000 SH
8 BIOVENTUS INC BVS 09075A108 $56.6M 1.89% 6,000,279 SH
9 HILTON GRAND VACATIONS INC Call HGV 43283X105 $56.3M 1.87% 1,075,000 SH
10 HILTON GRAND VACATIONS INC HGV 43283X105 $54.1M 1.80% 1,033,170 SH
11 SAVARA INC SVRA 805111101 $43.0M 1.43% 6,976,810 SH
12 ETON PHARMACEUTICALS INC ETON 29772L108 $42.6M 1.42% 1,175,951 SH
13 AMNEAL PHARMACEUTICALS INC AMRX 03168L105 $39.3M 1.31% 2,268,751 SH
14 EVOLUS INC EOLS 30052C107 $38.9M 1.29% 5,602,021 SH
15 ETF SER SOLUTIONS Put QTUM 26922A420 $36.9M 1.23% 223,000 SH
16 UNIQURE NV Call QURE N90064101 $36.8M 1.23% 800,000 SH
17 AVALO THERAPEUTICS INC AVTX 05338F306 $34.4M 1.15% 1,862,250 SH
18 LB PHARMACEUTICALS INC LBRX 50180M108 $34.2M 1.14% 1,052,894 SH
19 NEUROCRINE BIOSCIENCES INC Call NBIX 64125C109 $33.7M 1.12% 200,000 SH
20 PRAXIS PRECISION MEDICINES I Put PRAX 74006W207 $33.5M 1.11% 100,000 SH
21 ANTERIS TECHNOLOGIES GLOBAL AVR 03675P102 $33.3M 1.11% 3,383,335 SH
22 ABEONA THERAPEUTICS INC ABEO 00289Y206 $31.7M 1.06% 5,136,490 SH
23 KRYSTAL BIOTECH INC Put KRYS 501147102 $31.6M 1.05% 85,000 SH
24 PELOTON INTERACTIVE INC PTON 70614W100 $30.2M 1.01% 5,108,995 SH
25 ESTABLISHMENT LABS HLDGS INC ESTA G31249108 $28.8M 0.96% 335,830 SH
26 XTANT MED HLDGS INC XTNT 98420P308 $28.8M 0.96% 68,394,000 SH
27 JACK IN THE BOX INC JACK 466367109 $27.3M 0.91% 1,728,659 SH
28 GOGO INC GOGO 38046C109 $27.0M 0.90% 8,697,731 SH
29 IMAX CORP IMAX 45245E109 $26.2M 0.87% 658,009 SH
30 ZEVRA THERAPEUTICS INC ZVRA 488445206 $25.8M 0.86% 1,797,476 SH
31 REGENERON PHARMACEUTICALS Call REGN 75886F107 $24.9M 0.83% 40,000 SH
32 TITAN MACHY INC TITN 88830R101 $23.9M 0.80% 1,133,088 SH
33 RMR GROUP INC RMR 74967R106 $23.6M 0.78% 1,147,902 SH
34 FOSSIL GROUP INC FOSL 34988V106 $22.8M 0.76% 5,505,128 SH
35 FOX FACTORY HLDG CORP FOXF 35138V102 $22.2M 0.74% 1,310,695 SH
36 MINERALYS THERAPEUTICS INC MLYS 603170101 $22.1M 0.74% 820,481 SH
37 RIDENOW GROUP INC RDNW 781386305 $21.8M 0.73% 3,272,845 SH
38 SNAP INC Call SNAP 83304A106 $21.3M 0.71% 4,800,000 SH
39 UNIQURE NV QURE N90064101 $21.0M 0.70% 455,660 SH
40 AURA BIOSCIENCES INC AURA 05153U107 $21.0M 0.70% 2,951,030 SH
41 AGOMAB THERAPEUTICS NV AGMB 00860C102 $20.4M 0.68% 1,568,188 SH
42 FULCRUM THERAPEUTICS INC FULC 359616109 $20.0M 0.67% 5,475,040 SH
43 BENITEC BIOPHARMA INC BNTC 08205P209 $19.9M 0.66% 1,488,371 SH
44 ADMA BIOLOGICS INC ADMA 000899104 $19.8M 0.66% 2,359,993 SH
45 CAMPING WORLD HLDGS INC CWH 13462K109 $19.5M 0.65% 2,551,055 SH
46 BIOCRYST PHARMACEUTICALS INC BCRX 09058V103 $19.0M 0.63% 1,901,160 SH
47 MIMEDX GROUP INC MDXG 602496101 $18.4M 0.61% 4,767,552 SH
48 ABIVAX SA ABVX 00370M103 $17.8M 0.59% 133,759 SH
49 USANA HEALTH SCIENCES INC USNA 90328M107 $17.3M 0.58% 810,074 SH
50 MONTE ROSA THERAPEUTICS INC GLUE 61225M102 $15.8M 0.53% 651,993 SH
Filing History
Period Filed AUM Holdings Accession
2026-06-30 2026-08-19 $3.01B 155 0001104659-26-098416
2026-06-30 2026-08-14 $3.00B 152 0001104659-26-097253
2026-03-31 2026-05-15 $2.72B 152 0001104659-26-062659
2025-12-31 2026-02-13 $3.02B 153 0001104659-26-015271
2025-09-30 2025-11-14 $2.88B 153 0001104659-25-112624
Filer Information
Address
130 MAIN ST.
2ND FLOOR
NEW CANAAN, CT 06840
Phone
(203) 404-1172
Filing Manager
Nantahala Capital Management, LLC
NEW CANAAN, CT
Signatory
Taki Vasilakis
Chief Compliance Officer