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 | |
|---|---|---|---|---|---|---|---|
8026
PUT
Happen Inc
HAPN
$1.67B
| $6.22K | ﹤0.01% |
300
| – | – |
2015 Q1
45 quarters
|
|
8027
PUT
Defi Technologies
DEFT
$162M
| $6.22K | ﹤0.01% |
12,100
+1,100
| +10% | +$746 |
2025 Q3
3 quarters
|
|
8028
CALL
MediciNova
MNOV
$69.4M
| $6.2K | ﹤0.01% |
+4,700
| New | +$6.44K |
2026 Q2
0 quarters
|
|
8029
PUT
Broadstone Net Lease
BNL
$3.37B
| $6.2K | ﹤0.01% |
300
+200
| +200% | +$4.03K |
2021 Q1
21 quarters
|
|
8030
PUT
Usio Inc
USIO
$90M
| $6.2K | ﹤0.01% |
+2,500
| New | +$3.69K |
2026 Q2
0 quarters
|
|
8031
CALL
Columbia Sportswear
COLM
$3.18B
| $6.18K | ﹤0.01% |
100
-100
| -50% | -$6.19K |
2023 Q4
10 quarters
|
|
8032
Pathward Financial
CASH
$1.59B
| $6.18K | ﹤0.01% |
+71
| New | +$6.14K |
2026 Q2
0 quarters
|
|
8033
Cohen & Steers
CNS
$3.71B
| $6.17K | ﹤0.01% |
+81
| New | +$5.73K |
2026 Q2
0 quarters
|
|
8034
PUT
Utz Brands
UTZ
$1.27B
| $6.16K | ﹤0.01% |
800
-500
| -38% | -$3.73K |
2024 Q4
6 quarters
|
|
8035
First Commonwealth Financial
FCF
$2.13B
| $6.16K | ﹤0.01% |
303
-1,110
| -79% | -$21K |
2026 Q1
1 quarter
|
|
8036
CALL
MillerKnoll
MLKN
$1.49B
| $6.14K | ﹤0.01% |
300
+200
| +200% | +$3.2K |
2025 Q2
4 quarters
|
|
8037
CALL
Build-A-Bear
BBW
$300M
| $6.12K | ﹤0.01% |
200
-3,500
| -95% | -$126K |
2019 Q4
26 quarters
|
|
8038
PUT
Astec Industries
ASTE
$896M
| $6.12K | ﹤0.01% |
100
| – | – |
2026 Q1
1 quarter
|
|
8039
First Trust Nasdaq Bank ETF
FTXO
$248M
| $6.12K | ﹤0.01% |
148
+63
| +74% | +$2.45K |
2026 Q1
1 quarter
|
|
8040
PUT
Fortive
FTV
$18.1B
| $6.11K | ﹤0.01% |
+100
| New | +$6K |
2026 Q2
0 quarters
|
|
8041
CALL
Bombardier Recreational Products
DOO
$4.17B
| $6.1K | ﹤0.01% |
+100
| New | +$6.02K |
2026 Q2
0 quarters
|
|
|
8042
PUT
Bombardier Recreational Products
DOO
$4.17B
| $6.1K | ﹤0.01% |
100
-42,900
| -100% | -$2.58M |
2025 Q4
2 quarters
|
|
|
8043
PUT
First Commonwealth Financial
FCF
$2.13B
| $6.1K | ﹤0.01% |
300
-9,700
| -97% | -$183K |
2026 Q1
1 quarter
|
|
8044
iShares US Regional Banks ETF
IAT
$641M
| $6.1K | ﹤0.01% |
+98
| New | +$5.7K |
2026 Q2
0 quarters
|
|
8045
PUT
Beacon Financial Corp
BBT
$2.51B
| $6.09K | ﹤0.01% |
+200
| New | +$5.99K |
2026 Q2
0 quarters
|
|
8046
PUT
DELISTED
Leslie's
LESL
| $6.09K | ﹤0.01% |
600
+300
| +100% | +$1.18K |
2025 Q3
3 quarters
|
|
8047
CALL
Regencell Bioscience
RGC
$4.86B
| $6.09K | ﹤0.01% |
1,000
-1,900
| -66% | -$45.6K |
2026 Q1
1 quarter
|
|
8048
CALL
Curbline Properties
CURB
$3.32B
| $6.08K | ﹤0.01% |
+200
| New | +$5.71K |
2026 Q2
0 quarters
|
|
8049
CALL
DELISTED
Emerald Holding
EEX
| $6.05K | ﹤0.01% |
+1,200
| New | +$5.83K |
2026 Q2
0 quarters
|
|
8050
State Street SPDR Portfolio Developed World ex-US ETF
SPDW
$40.8B
| $6.05K | ﹤0.01% |
120
-948
| -89% | -$47K |
2026 Q1
1 quarter
|
|
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.