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 | |
|---|---|---|---|---|---|---|---|
8501
CALL
Wabash National
WNC
$525M
| $2.7K | ﹤0.01% |
+200
| New | +$1.78K |
2026 Q2
0 quarters
|
|
8502
CALL
Kemper
KMPR
$1.78B
| $2.7K | ﹤0.01% |
100
| – | – |
2026 Q1
1 quarter
|
|
8503
CALL
GH Research
GHRS
$1.27B
| $2.69K | ﹤0.01% |
100
-100
| -50% | -$2.09K |
2024 Q1
9 quarters
|
|
8504
PUT
BlackRock TCP Capital
TCPC
$343M
| $2.69K | ﹤0.01% |
800
-6,500
| -89% | -$25.2K |
2024 Q1
9 quarters
|
|
8505
CALL
Seanergy Maritime Holdings
SHIP
$333M
| $2.69K | ﹤0.01% |
200
-100
| -33% | -$1.51K |
2026 Q1
1 quarter
|
|
8506
CALL
Prudential
PUK
$29.5B
| $2.68K | ﹤0.01% |
100
| – | – |
2024 Q4
6 quarters
|
|
8507
CALL
Fold Holdings
FLD
$28M
| $2.67K | ﹤0.01% |
5,900
+5,600
| +1,867% | +$6.04K |
2025 Q3
3 quarters
|
|
|
QVCGA
8508
CALL
DELISTED
QVC Group Inc Series A
QVCGA
| $2.67K | ﹤0.01% |
24,300
+3,800
| +19% | +$6.05K |
2025 Q3
3 quarters
|
|
8509
CALL
So-Young International
SY
$213M
| $2.66K | ﹤0.01% |
1,800
+300
| +20% | +$721 |
2025 Q2
4 quarters
|
|
8510
PUT
Aterian
ATER
$11.6M
| $2.64K | ﹤0.01% |
+2,000
| New | +$2.07K |
2026 Q2
0 quarters
|
|
8511
PUT
Alto Neuroscience
ANRO
$893M
| $2.64K | ﹤0.01% |
100
| – | – |
2025 Q3
3 quarters
|
|
8512
ProShares UltraShort Consumer Discretionary
SCC
$2.96M
| $2.64K | ﹤0.01% |
182
+174
| +2,175% | +$2.58K |
2026 Q1
1 quarter
|
|
8513
Tradr 2X Long PATH Daily ETF
PATX
$3.58M
| $2.64K | ﹤0.01% |
+338
| New | +$2.69K |
2026 Q2
0 quarters
|
|
8514
PUT
Envista
NVST
$3.8B
| $2.64K | ﹤0.01% |
+100
| New | +$2.52K |
2026 Q2
0 quarters
|
|
8515
FT Energy Income Partners Enhanced Income ETF
EIPI
$1.09B
| $2.62K | ﹤0.01% |
+120
| New | +$2.67K |
2026 Q2
0 quarters
|
|
8516
OFS Capital
OFS
$52.4M
| $2.62K | ﹤0.01% |
740
-1,211
| -62% | -$4.43K |
2025 Q4
2 quarters
|
|
8517
PUT
International General Insurance
IGIC
$1.07B
| $2.62K | ﹤0.01% |
100
| – | – |
2026 Q1
1 quarter
|
|
8518
Midland States Bancorp
MSBI
$689M
| $2.62K | ﹤0.01% |
+84
| New | +$2.26K |
2026 Q2
0 quarters
|
|
8519
AutoNation
AN
$5.28B
| $2.6K | ﹤0.01% |
14
-34
| -71% | -$6.65K |
2025 Q2
4 quarters
|
|
8520
PUT
DNOW Inc
DNOW
$2.8B
| $2.59K | ﹤0.01% |
200
-1,200
| -86% | -$15.6K |
2026 Q1
1 quarter
|
|
8521
CALL
Rani Therapeutics
RANI
$67.3M
| $2.58K | ﹤0.01% |
3,400
-116,700
| -97% | -$103K |
2024 Q1
9 quarters
|
|
8522
CALL
Mueller Water Products
MWA
$3.44B
| $2.58K | ﹤0.01% |
+100
| New | +$2.68K |
2026 Q2
0 quarters
|
|
|
8523
PUT
Mueller Water Products
MWA
$3.44B
| $2.58K | ﹤0.01% |
+100
| New | +$2.68K |
2026 Q2
0 quarters
|
|
8524
Oxford Square Capital
OXSQ
$141M
| $2.58K | ﹤0.01% |
1,955
+1,790
| +1,085% | +$2.87K |
2025 Q4
2 quarters
|
|
8525
Strive US Energy ETF
DRLL
$336M
| $2.58K | ﹤0.01% |
+77
| New | +$2.79K |
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.