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 | |
|---|---|---|---|---|---|---|---|
6851
CALL
UFP Technologies
UFPT
$2.29B
| $26.5K | ﹤0.01% |
+100
| New | +$21.7K |
2026 Q2
0 quarters
|
|
|
6852
PUT
UFP Technologies
UFPT
$2.29B
| $26.5K | ﹤0.01% |
100
-1,400
| -93% | -$304K |
2024 Q2
8 quarters
|
|
6853
PUT
Covenant Logistics
CVLG
$741M
| $26.5K | ﹤0.01% |
600
-3,400
| -85% | -$124K |
2026 Q1
1 quarter
|
|
6854
Aemetis
AMTX
$93.8M
| $26.5K | ﹤0.01% |
+16,156
| New | +$39.5K |
2026 Q2
0 quarters
|
|
6855
CALL
Post Holdings
POST
$3.54B
| $26.5K | ﹤0.01% |
300
-10,600
| -97% | -$1.03M |
2026 Q1
1 quarter
|
|
6856
Odyssey Marine Exploration
OMEX
$32.6M
| $26.4K | ﹤0.01% |
31,104
+10,367
| +50% | +$10.6K |
2025 Q2
4 quarters
|
|
6857
CALL
Wolverine World Wide
WWW
$1.67B
| $26.4K | ﹤0.01% |
1,600
+1,100
| +220% | +$18.6K |
2021 Q2
20 quarters
|
|
6858
8x8 Inc
EGHT
$308M
| $26.4K | ﹤0.01% |
+15,446
| New | +$31.1K |
2026 Q2
0 quarters
|
|
6859
CALL
Ryder
R
$10.4B
| $26.4K | ﹤0.01% |
100
-500
| -83% | -$122K |
2026 Q1
1 quarter
|
|
6860
CALL
Korro Bio
KRRO
$176M
| $26.4K | ﹤0.01% |
2,000
+700
| +54% | +$8.7K |
2025 Q4
2 quarters
|
|
6861
CALL
Telefônica Brasil
VIV
$20.7B
| $26.3K | ﹤0.01% |
2,000
+1,800
| +900% | +$26.3K |
2018 Q2
32 quarters
|
|
6862
PUT
Dolby
DLB
$5.89B
| $26.3K | ﹤0.01% |
500
| – | – |
2025 Q2
4 quarters
|
|
6863
CALL
Bowman Consulting
BWMN
$711M
| $26.3K | ﹤0.01% |
+900
| New | +$28.3K |
2026 Q2
0 quarters
|
|
6864
Old Republic International
ORI
$9.39B
| $26.2K | ﹤0.01% |
641
-4,606
| -88% | -$183K |
2026 Q1
1 quarter
|
|
6865
Flowers Foods
FLO
$1.3B
| $26.2K | ﹤0.01% |
+3,319
| New | +$26.6K |
2026 Q2
0 quarters
|
|
6866
Hannon Armstrong Sustainable Infrastructure Capital
HASI
$4.67B
| $26.2K | ﹤0.01% |
+671
| New | +$26.8K |
2026 Q2
0 quarters
|
|
6867
CALL
DELISTED
Crinetics Pharmaceuticals
CRNX
| $26.2K | ﹤0.01% |
700
-4,100
| -85% | -$152K |
2026 Q1
1 quarter
|
|
6868
PUT
Alignment Healthcare
ALHC
$1.67B
| $26.2K | ﹤0.01% |
1,100
-28,100
| -96% | -$539K |
2024 Q4
6 quarters
|
|
6869
PUT
Werner Enterprises
WERN
$1.73B
| $26.2K | ﹤0.01% |
600
-2,100
| -78% | -$79.1K |
2025 Q3
3 quarters
|
|
6870
PUT
AudioEye
AEYE
$102M
| $26.1K | ﹤0.01% |
+4,500
| New | +$31.3K |
2026 Q2
0 quarters
|
|
6871
Cantor Equity Partners I
CEPO
$275M
| $26.1K | ﹤0.01% |
2,961
-4,074
| -58% | -$43K |
2026 Q1
1 quarter
|
|
6872
PUT
Farmland Partners
FPI
$447M
| $26.1K | ﹤0.01% |
2,700
+700
| +35% | +$7.46K |
2018 Q4
30 quarters
|
|
6873
CALL
Sunrise Realty Trust
SUNS
$85.8M
| $26.1K | ﹤0.01% |
3,300
| – | – |
2025 Q1
5 quarters
|
|
|
6874
Korro Bio
KRRO
$176M
| $26K | ﹤0.01% |
+1,975
| New | +$24.5K |
2026 Q2
0 quarters
|
|
6875
PUT
Braze
BRZE
$5.21B
| $26K | ﹤0.01% |
1,200
-3,600
| -75% | -$80.2K |
2022 Q2
16 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.