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 | |
|---|---|---|---|---|---|---|---|
8851
PUT
Ampco-Pittsburgh
AP
$162M
| $865 | ﹤0.01% |
100
| – | – |
2025 Q3
3 quarters
|
|
8852
Afya
AFYA
$1.34B
| $860 | ﹤0.01% |
+58
| New | +$841 |
2026 Q2
0 quarters
|
|
8853
Corgi Quantum Computing ETF
CQTM
$10.4M
| $856 | ﹤0.01% |
+27
| New | +$802 |
2026 Q2
0 quarters
|
|
8854
PUT
Endava
DAVA
$113M
| $849 | ﹤0.01% |
300
-1,400
| -82% | -$5.16K |
2021 Q4
18 quarters
|
|
8855
Invesco S&P 500 Equal Weight Communication Services ETF
RSPC
$53.3M
| $847 | ﹤0.01% |
24
+8
| +50% | +$300 |
2026 Q1
1 quarter
|
|
8856
PUT
Quad
QUAD
$486M
| $843 | ﹤0.01% |
+100
| New | +$752 |
2026 Q2
0 quarters
|
|
8857
iShares Self-Driving EV and Tech ETF
IDRV
$240M
| $838 | ﹤0.01% |
+22
| New | +$922 |
2026 Q2
0 quarters
|
|
8858
PUT
Solaris Resources
SLSR
$1.11B
| $838 | ﹤0.01% |
+100
| New | +$968 |
2026 Q2
0 quarters
|
|
8859
CALL
Acco Brands
ACCO
$422M
| $832 | ﹤0.01% |
+200
| New | +$734 |
2026 Q2
0 quarters
|
|
8860
PUT
Key Tronic
KTCC
$23.5M
| $826 | ﹤0.01% |
200
-900
| -82% | -$2.95K |
2025 Q4
2 quarters
|
|
8861
PUT
DELISTED
Arch Indices VOI Absolute Income Fund
VWI
| $824 | ﹤0.01% |
+300
| New | +$824 |
2026 Q2
0 quarters
|
|
8862
CALL
Intellicheck
IDN
$49.5M
| $819 | ﹤0.01% |
200
-700
| -78% | -$4.2K |
2024 Q1
9 quarters
|
|
8863
PUT
NCR Voyix
VYX
$1.16B
| $817 | ﹤0.01% |
+100
| New | +$704 |
2026 Q2
0 quarters
|
|
8864
PUT
Franklin BSP Realty Trust
FBRT
$518M
| $814 | ﹤0.01% |
100
| – | – |
2025 Q1
5 quarters
|
|
8865
CALL
SCYNEXIS
SCYX
$37.7M
| $814 | ﹤0.01% |
200
-300
| -60% | -$1.86K |
2025 Q4
2 quarters
|
|
8866
PUT
Obsidian Energy
OBE
$803M
| $813 | ﹤0.01% |
100
-1,100
| -92% | -$12.3K |
2025 Q1
5 quarters
|
|
8867
PUT
Gerdau
GGB
$10B
| $808 | ﹤0.01% |
+200
| New | +$889 |
2026 Q2
0 quarters
|
|
8868
CALL
Westwater Resources
WWR
$53.2M
| $808 | ﹤0.01% |
1,600
-12,500
| -89% | -$7.4K |
2025 Q2
4 quarters
|
|
8869
Tuniu
TOUR
$52M
| $801 | ﹤0.01% |
166
-63
| -28% | -$381 |
2025 Q3
3 quarters
|
|
8870
Invesco Actively Managed Exch-Traded Commodity Fd Tr Invesco Optimum Yield Diversified Commodity Strategy No K-1 ETF
PDBC
$8.11B
| $794 | ﹤0.01% |
+50
| New | +$878 |
2026 Q2
0 quarters
|
|
8871
CALL
Oxford Square Capital
OXSQ
$140M
| $792 | ﹤0.01% |
600
+500
| +500% | +$801 |
2026 Q1
1 quarter
|
|
8872
PUT
Thryv Holdings
THRY
$52.9M
| $788 | ﹤0.01% |
200
-31,100
| -99% | -$111K |
2026 Q1
1 quarter
|
|
8873
PUT
Liberty Latin America Class C
LILAK
$1.57B
| $785 | ﹤0.01% |
+200
| New | +$1.45K |
2026 Q2
0 quarters
|
|
8874
CALL
NovaBridge Biosciences American Depositary Shares
NBP
$158M
| $780 | ﹤0.01% |
400
-5,900
| -94% | -$12K |
2025 Q2
4 quarters
|
|
8875
Defiance Daily Target 2x Long NVO ETF
NVOX
$42.7M
| $770 | ﹤0.01% |
+48
| New | +$645 |
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.