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 | |
|---|---|---|---|---|---|---|---|
8576
PUT
TaskUs
TASK
$797M
| $2.34K | ﹤0.01% |
500
+300
| +150% | +$1.82K |
2026 Q1
1 quarter
|
|
8577
PUT
AI Financial Corp
AIFC
$41.3M
| $2.34K | ﹤0.01% |
4,000
-270,000
| -99% | -$226K |
2025 Q2
4 quarters
|
|
8578
PUT
Suzano
SUZ
$10.5B
| $2.33K | ﹤0.01% |
+300
| New | +$2.6K |
2026 Q2
0 quarters
|
|
8579
CALL
Aardvark Therapeutics
AARD
$86.4M
| $2.3K | ﹤0.01% |
+400
| New | +$1.87K |
2026 Q2
0 quarters
|
|
8580
Factset
FDS
$11.9B
| $2.3K | ﹤0.01% |
+10
| New | +$2.3K |
2026 Q2
0 quarters
|
|
8581
Stantec
STN
$8.18B
| $2.27K | ﹤0.01% |
+33
| New | +$2.66K |
2026 Q2
0 quarters
|
|
8582
Cato Corp
CATO
$46.2M
| $2.27K | ﹤0.01% |
701
-10,298
| -94% | -$31.4K |
2025 Q4
2 quarters
|
|
8583
Global X Aging Population ETF
AGNG
$94.1M
| $2.27K | ﹤0.01% |
63
-147
| -70% | -$5.2K |
2025 Q4
2 quarters
|
|
8584
CALL
FingerMotion
FNGR
$11.9M
| $2.27K | ﹤0.01% |
6,000
-5,200
| -46% | -$4.15K |
2022 Q4
14 quarters
|
|
8585
PUT
PennantPark Floating Rate Capital
PFLT
$637M
| $2.24K | ﹤0.01% |
300
+200
| +200% | +$1.66K |
2026 Q1
1 quarter
|
|
8586
Scully Royalty
SRL
$69.7M
| $2.24K | ﹤0.01% |
366
-216
| -37% | -$1.51K |
2026 Q1
1 quarter
|
|
8587
PUT
American Vanguard Corp
AVD
$31.3M
| $2.24K | ﹤0.01% |
+800
| New | +$2.17K |
2026 Q2
0 quarters
|
|
8588
CALL
Compañía de Cervecerías Unidas
CCU
$1.97B
| $2.24K | ﹤0.01% |
200
-400
| -67% | -$4.64K |
2024 Q4
6 quarters
|
|
8589
PUT
Stagwell
STGW
$2.2B
| $2.23K | ﹤0.01% |
300
| – | – |
2026 Q1
1 quarter
|
|
8590
Leverage Shares 2x Long FIG Daily ETF
FIGG
$11.1M
| $2.22K | ﹤0.01% |
+157
| New | +$3.1K |
2026 Q2
0 quarters
|
|
8591
CALL
Cytek Biosciences
CTKB
$706M
| $2.22K | ﹤0.01% |
500
-300
| -38% | -$1.28K |
2025 Q4
2 quarters
|
|
8592
Zumiez
ZUMZ
$220M
| $2.21K | ﹤0.01% |
124
-546
| -81% | -$12.2K |
2025 Q1
5 quarters
|
|
8593
CALL
Quantum eMotion
QNC
$255M
| $2.18K | ﹤0.01% |
+700
| New | +$2.03K |
2026 Q2
0 quarters
|
|
8594
PUT
Nature's Sunshine
NATR
$218M
| $2.18K | ﹤0.01% |
+100
| New | +$2.33K |
2026 Q2
0 quarters
|
|
8595
CALL
Global Water Resources
GWRS
$227M
| $2.17K | ﹤0.01% |
300
+100
| +50% | +$724 |
2024 Q3
7 quarters
|
|
8596
Tradr 2X Long CBRS Daily ETF
CBRX
$843K
| $2.16K | ﹤0.01% |
+127
| New | +$2.35K |
2026 Q2
0 quarters
|
|
8597
PUT
CTO Realty Growth
CTO
$759M
| $2.15K | ﹤0.01% |
100
| – | – |
2023 Q4
10 quarters
|
|
8598
Compugen
CGEN
$186M
| $2.15K | ﹤0.01% |
+1,005
| New | +$2.52K |
2026 Q2
0 quarters
|
|
8599
Kingsway Corp
KWY
$286M
| $2.15K | ﹤0.01% |
206
-10,192
| -98% | -$110K |
2026 Q1
1 quarter
|
|
8600
First Tracks Biotherapeutics
TRAX
$1.54B
| $2.13K | ﹤0.01% |
+106
| New | +$1.98K |
2026 Q2
0 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.