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SABBY MANAGEMENT, LLC — 13F Holdings & Portfolio

CIK 1535610 · latest 13F-HR filed 2026-08-14

Backtest portfolio

SABBY MANAGEMENT, LLC manages $110.5M in 13F-reported U.S. long-equity assets across 23 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are SPYM (48.99%), EFIV (13.85%), IFXAF (12.02%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 8 new positions and exited 14; 3 existing positions rose in reported value and 5 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.

Loading holdings…
AUM
$110.5M

Long-equity book

Holdings
23

Distinct positions

Period
2026-06-30

Filed 2026-08-14

Q/Q Activity
+8 / −14 / ↑3 / ↓5

vs 2026-03-31

Portfolio charts

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

Portfolio map

Q2 26
SPY34.2% · +101%TOYO29.1% · newFAMI7.0% · newCRVO6.4% · newTPST4.7% · +2763%PAVS4.7% · newBIAF2.5% · newCREG2.2% · newBCTX2.2% · +9%REVB1.8% · +112%SNES1.8% · -35%BCTXL1.4% · -50%SIDU1.0% · newINM0.6% · -80%NUWE0.4% · newBCTXZ0.1% · -42%

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 = 94.7%

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

Firm Profile & Key People

As of the firm’s regulatory filing dated Jul 8, 2026.

Phone
(646) 307-4500
This firm reports 3 disclosure items on its registration.
Name Title / Status Ownership Type
GRUNDSTEIN, ROBERT, ALAN ControlPRINCIPAL, MEMBER, CHIEF OPERATING OFFICER AND GENERAL COUNSEL OF SABBY MANAGEMENT, LLC AND SABBY CAPITAL, LLC
since Jun 2011
25–50%Individual
GRUNDSTEIN, ROBERT, ALAN ControlCHIEF COMPLIANCE OFFICER OF SABBY MANAGEMENT, LLC AND SABBY CAPITAL, LLC
since Jun 2013
25–50%Individual
MINTZ, HAL, DAVID ControlPRINCIPAL AND MANAGING MEMBER OF SABBY MANAGEMENT, LLC AND SABBY CAPITAL, LLC
since Jun 2011
50–75%Individual
Ownership & leadership changes · 4 filings with changes since Apr 11, 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 18, 2021 filing
  • ChangedGRUNDSTEIN, ROBERT, ALAN · ownership 10–25% → 25–50%
  • ChangedMINTZ, HAL, DAVID · ownership 75% or more → 50–75%
Jul 24, 2013 filing
  • ChangedGRUNDSTEIN, ROBERT, ALAN · title CHIEF COMPLIANCE OFFICER OF SABBY MANAGEMENT, LLC AND SABBY CAPITAL, LLC / PRINCIPAL, CHIEF OPERATING OFFICER AND GENERAL COUNSEL OF SABBY MANAGEMENT, LLC AND SABBY CAPITAL, LLC → CHIEF COMPLIANCE OFFICER OF SABBY MANAGEMENT, LLC AND SABBY CAPITAL, LLC / PRINCIPAL, MEMBER, CHIEF OPERATING OFFICER AND GENERAL COUNSEL OF SABBY MANAGEMENT, LLC AND SABBY CAPITAL, LLC
  • ChangedMINTZ, HAL, DAVID · title PRINCIPAL AND MANAGER OF SABBY MANAGEMENT, LLC AND SABBY CAPITAL, LLC → PRINCIPAL AND MANAGING MEMBER OF SABBY MANAGEMENT, LLC AND SABBY CAPITAL, LLC
Jun 27, 2013 filing
  • ChangedGRUNDSTEIN, ROBERT, ALAN · title PRINCIPAL, CHIEF OPERATING OFFICER AND GENERAL COUNSEL OF SABBY MANAGEMENT, LLC AND SABBY CAPITAL, LLC → CHIEF COMPLIANCE OFFICER OF SABBY MANAGEMENT, LLC AND SABBY CAPITAL, LLC / PRINCIPAL, CHIEF OPERATING OFFICER AND GENERAL COUNSEL OF SABBY MANAGEMENT, LLC AND SABBY CAPITAL, LLC
Apr 1, 2013 filing
  • ChangedGRUNDSTEIN, ROBERT, ALAN · title CHIEF OPERATING OFFICER AND GENERAL COUNSEL OF BAM MANAGEMENT, LLC, BAM OFFSHORE MANAGEMENT, LLC AND OFFSHORE FUND GP, LLC / CHIEF OPERATING OFFICER AND GENERAL COUNSEL OF SABBY MANAGEMENT, LLC AND SABBY CAPITAL, LLC → PRINCIPAL, CHIEF OPERATING OFFICER AND GENERAL COUNSEL OF SABBY MANAGEMENT, LLC AND SABBY CAPITAL, LLC; ownership Less than 5% → 10–25%
  • ChangedMINTZ, HAL, DAVID · title PRINCIPAL AND MANAGER OF BAM MANAGEMENT, LLC, BAM OFFSHORE MANAGEMENT, LLC AND OFFSHORE FUND GP, LLC / PRINCIPAL AND MANAGER OF SABBY MANAGEMENT, LLC AND SABBY CAPITAL, LLC → PRINCIPAL AND MANAGER OF SABBY MANAGEMENT, LLC AND SABBY CAPITAL, LLC
Apr 11, 2012 filing (earliest on record)
  • ListedGRUNDSTEIN, ROBERT, ALAN · CHIEF OPERATING OFFICER AND GENERAL COUNSEL OF BAM MANAGEMENT, LLC, BAM OFFSHORE MANAGEMENT, LLC AND OFFSHORE FUND GP, LLC / CHIEF OPERATING OFFICER AND GENERAL COUNSEL OF SABBY MANAGEMENT, LLC AND SABBY CAPITAL, LLC · Less than 5% · control person
  • ListedMINTZ, HAL, DAVID · PRINCIPAL AND MANAGER OF BAM MANAGEMENT, LLC, BAM OFFSHORE MANAGEMENT, LLC AND OFFSHORE FUND GP, LLC / PRINCIPAL AND MANAGER OF SABBY MANAGEMENT, LLC AND SABBY CAPITAL, LLC · 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.

SABBY 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 STATE STREET SPDR S&P Put SPYM 78462F953 $54.1M 48.99% 725 SH
2 STATE STREET SPDR S&P Call EFIV 78462F903 $15.3M 13.85% 205 SH
3 ISHARES RUSSELL Call IFXAF 464287905 $13.3M 12.02% 442 SH
4 ISHARES RUSSELL Put IFXAF 464287955 $13.2M 11.99% 441 SH
5 STATE STREET SPDR S&P SPY 78462F103 $4.1M 3.72% 5,500 SH
6 TOYO CO LTD TOYO G8976D107 $3.5M 3.17% 503,846 SH
7 ABIVAX SA Call AAVXF 00370M903 $1.1M 0.99% 82 SH
8 FARMMI INC FAMI G33277149 $840.3K 0.76% 3,515,929 SH
9 SIDUS SPACE INC Put SIDU 826165951 $816.3K 0.74% 2,905 SH
10 CERVOMED INC CRVO 15713L109 $771.5K 0.70% 248,880 SH
11 ZEVRA THERAPEUTICS Put ZVRA 488445956 $612.3K 0.55% 427 SH
12 TEMPEST THERAPEUTICS INC TPST 87978U207 $567.5K 0.51% 511,286 SH
13 PARANOVUS ENTERTNMNT TECH LT PAVS G4289N155 $560.5K 0.51% 75,440 SH
14 BIOAFFINITY TECHNOLOGIES BIAF 09076W307 $296.9K 0.27% 365,647 SH
15 SMART POWER CORP CREG 168913507 $263.2K 0.24% 127,774 SH
16 BRIACELL THERAPEUTICS CORP BCTX 107930307 $261.5K 0.24% 80,721 SH
17 REVELATION BIOSCIENCES INC REVB 76135L804 $216.9K 0.20% 210,582 SH
18 SENESTECH INC SNES 81720R604 $211.2K 0.19% 141,756 SH
19 BRIACELL THERAPEUTICS CORP BCTXL 107930125 $169.4K 0.15% 190,383 SH
20 SIDUS SPACE INC SIDU 826165201 $121.9K 0.11% 43,377 SH
21 INMED PHARMACEUTICALS INM 457637700 $69.7K 0.06% 44,970 SH
22 NUWELLIS INC NUWE 67113Y801 $49.9K 0.05% 16,372 SH
23 BRIACELL THERAPEUTICS CORP BCTXZ 107930117 $11.5K 0.01% 120,802 SH
Filing History
Period Filed AUM Holdings Accession
2026-06-30 2026-08-14 $110.5M 23 0001104659-26-096397
2026-03-31 2026-05-15 $45.1M 28 0001104659-26-061764
2025-12-31 2026-02-17 $69.5M 33 0001104659-26-015753
2025-09-30 2025-11-14 $86.4M 39 0001104659-25-111938
Filer Information
Address
1011 LINKS DR
MIAMI BEACH, FL 33109
Phone
(646) 307-4500
Filing Manager
SABBY MANAGEMENT, LLC
MIAMI BEACH, FL
Signatory
Robert Grundstein
Chief Operating Officer