Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares Russell 2000 ETF
IWM
|
+$146M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$108M |
| 3 |
Apple
AAPL
|
+$62.9M |
| 4 |
Tesla
TSLA
|
+$51.9M |
| 5 |
Micron Technology
MU
|
+$39.5M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$108M |
| 2 |
Meta Platforms (Facebook)
META
|
+$104M |
| 3 |
Advanced Micro Devices
AMD
|
+$92.1M |
| 4 |
Amazon
AMZN
|
+$90.3M |
| 5 |
TSMC
TSM
|
+$82.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.28% |
| 2 | Technology | 0.76% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Communication Services | 0.19% |
| 5 | Healthcare | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
6551
GeoPark
GPRK
$724M
| $38.1K | ﹤0.01% |
4,192
-3,928
| -48% | -$38.2K |
2023 Q3
11 quarters
|
|
6552
CALL
Hagerty
HGTY
$1.8B
| $38.1K | ﹤0.01% |
3,200
+3,000
| +1,500% | +$32.1K |
2024 Q4
6 quarters
|
|
6553
PUT
Heartflow Inc
HTFL
$4.96B
| $38.1K | ﹤0.01% |
1,300
+100
| +8% | +$3K |
2026 Q1
1 quarter
|
|
6554
V2X
VVX
$2.41B
| $38.1K | ﹤0.01% |
511
-159
| -24% | -$11.8K |
2026 Q1
1 quarter
|
|
6555
PUT
Kingstone Companies
KINS
$289M
| $38.1K | ﹤0.01% |
2,000
+600
| +43% | +$9.7K |
2025 Q3
3 quarters
|
|
6556
PUT
NB Bancorp
NBBK
$1.01B
| $38K | ﹤0.01% |
+1,800
| New | +$37K |
2026 Q2
0 quarters
|
|
6557
PUT
Filana Therapeutics
FLNA
$29.6M
| $37.8K | ﹤0.01% |
31,800
-13,000
| -29% | -$18.5K |
2021 Q1
21 quarters
|
|
6558
CALL
Ares Commercial Real Estate
ACRE
$189M
| $37.8K | ﹤0.01% |
8,400
-3,300
| -28% | -$16.3K |
2025 Q1
5 quarters
|
|
6559
CALL
Morgan Stanley Direct Lending Fund
MSDL
$1.12B
| $37.8K | ﹤0.01% |
2,500
| – | – |
2026 Q1
1 quarter
|
|
6560
CALL
Ryan Specialty Holdings
RYAN
$5.43B
| $37.8K | ﹤0.01% |
1,000
-3,400
| -77% | -$115K |
2022 Q3
15 quarters
|
|
6561
CALL
Dyne Therapeutics
DYN
$2.94B
| $37.8K | ﹤0.01% |
1,700
-2,300
| -58% | -$42.8K |
2023 Q4
10 quarters
|
|
6562
CALL
Aviat Networks
AVNW
$253M
| $37.7K | ﹤0.01% |
1,700
+1,600
| +1,600% | +$31.3K |
2025 Q1
5 quarters
|
|
6563
PUT
ARS Pharmaceuticals
SPRY
$390M
| $37.6K | ﹤0.01% |
4,700
+4,000
| +571% | +$34.4K |
2023 Q1
13 quarters
|
|
6564
PUT
Maximus
MMS
$3.32B
| $37.6K | ﹤0.01% |
700
-100
| -13% | -$6.23K |
2026 Q1
1 quarter
|
|
6565
Shattuck Labs
STTK
$556M
| $37.6K | ﹤0.01% |
+5,417
| New | +$33.8K |
2026 Q2
0 quarters
|
|
6566
iShares MSCI UAE ETF
UAE
$300M
| $37.6K | ﹤0.01% |
1,976
+1,048
| +113% | +$20.2K |
2026 Q1
1 quarter
|
|
6567
PUT
Grifois
GRFS
$5.39B
| $37.5K | ﹤0.01% |
5,300
-800
| -13% | -$6.32K |
2020 Q3
23 quarters
|
|
6568
Compañía de Minas Buenaventura
BVN
$7.22B
| $37.5K | ﹤0.01% |
1,281
-4,458
| -78% | -$151K |
2026 Q1
1 quarter
|
|
6569
JOYY Inc
JOYY
$4.06B
| $37.5K | ﹤0.01% |
+568
| New | +$35.3K |
2026 Q2
0 quarters
|
|
6570
PUT
Ardent Health
ARDT
$1.72B
| $37.4K | ﹤0.01% |
3,800
-200
| -5% | -$1.9K |
2025 Q4
2 quarters
|
|
6571
PUT
Yalla Group
YALA
$855M
| $37.3K | ﹤0.01% |
6,800
+100
| +1% | +$619 |
2021 Q1
21 quarters
|
|
6572
iShares Core MSCI Europe ETF
IEUR
$9.4B
| $37.3K | ﹤0.01% |
496
+433
| +687% | +$32.3K |
2026 Q1
1 quarter
|
|
6573
PUT
Global Partners
GLP
$1.63B
| $37.3K | ﹤0.01% |
800
-500
| -38% | -$23.6K |
2025 Q3
3 quarters
|
|
6574
PUT
Star Group
SGU
$427M
| $37.2K | ﹤0.01% |
2,900
+1,700
| +142% | +$21.6K |
2026 Q1
1 quarter
|
|
6575
CALL
Bitwise Ethereum ETF
ETHW
$246M
| $37.2K | ﹤0.01% |
3,300
-164,800
| -98% | -$2.43M |
2025 Q2
4 quarters
|
|
Similar funds
Simplex Trading's Q2 2026 Portfolio in Review
As of Q2 2026, Simplex Trading held 10,638 positions worth $171B, up 14% from $149B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q2 2026 filing shows 1,714 new, 3,712 increased, 3,486 reduced and 1,487 closed positions. Its largest new stake was Micron Technology: 52,682 shares worth $60.8M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $108M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q2 2026 buy was Micron Technology: 52,682 shares worth $60.8M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q2 2026, an estimated $146M increase.
- Simplex Trading's biggest Q2 2026 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $108M.
- Simplex Trading fully exited Intel in Q2 2026, selling an estimated $76.6M.
- Simplex Trading's ten largest holdings make up 50% of its $171B portfolio in Q2 2026.
- Simplex Trading opened 1,714 new positions and closed 1,487 in Q2 2026.
- Simplex Trading's portfolio value rose 14% quarter-over-quarter to $171B.
Based on Simplex Trading's 13F filing for Q2 2026, filed 12 Aug 2026.