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 | |
|---|---|---|---|---|---|---|---|
6101
CALL
Third Coast Bancshares
TCBX
$669M
| $60.6K | ﹤0.01% |
1,500
+1,100
| +275% | +$42.9K |
2026 Q1
1 quarter
|
|
6102
CALL
Global Partners
GLP
$1.61B
| $60.6K | ﹤0.01% |
1,300
-1,900
| -59% | -$89.7K |
2020 Q1
25 quarters
|
|
6103
CALL
Kazia Therapeutics
KZIA
$127M
| $60.5K | ﹤0.01% |
4,300
+3,300
| +330% | +$40.2K |
2026 Q1
1 quarter
|
|
6104
PUT
Evergy
EVRG
$19.7B
| $60.5K | ﹤0.01% |
700
-100
| -13% | -$8.28K |
2019 Q1
29 quarters
|
|
6105
PUT
Atour Lifestyle Holdings
ATAT
$4.46B
| $60.4K | ﹤0.01% |
1,900
+1,000
| +111% | +$35.8K |
2024 Q3
7 quarters
|
|
6106
PUT
Trustco Bank Corp NY
TRST
$962M
| $60.4K | ﹤0.01% |
+1,100
| New | +$54.6K |
2026 Q2
0 quarters
|
|
6107
CALL
Silence Therapeutics
SLN
$1.23B
| $60.4K | ﹤0.01% |
5,500
+5,400
| +5,400% | +$38K |
2025 Q4
2 quarters
|
|
6108
PUT
Stride
LRN
$3.29B
| $60.4K | ﹤0.01% |
700
-100
| -13% | -$9.19K |
2019 Q1
29 quarters
|
|
6109
State Street SPDR S&P Kensho Final Frontiers ETF
ROKT
$156M
| $60.3K | ﹤0.01% |
+505
| New | +$58.8K |
2026 Q2
0 quarters
|
|
6110
Tronox
TROX
$588M
| $60.3K | ﹤0.01% |
9,574
-84,068
| -90% | -$713K |
2025 Q2
4 quarters
|
|
6111
PUT
Global Self Storage
SELF
$55.4M
| $60.3K | ﹤0.01% |
11,500
+700
| +6% | +$3.68K |
2025 Q4
2 quarters
|
|
6112
PUT
SFL Corp
SFL
$1.76B
| $60.2K | ﹤0.01% |
5,900
+500
| +9% | +$5.67K |
2021 Q2
20 quarters
|
|
6113
PUT
Walker & Dunlop
WD
$1.19B
| $60.2K | ﹤0.01% |
+1,100
| New | +$55.7K |
2026 Q2
0 quarters
|
|
6114
Vitesse Energy
VTS
$772M
| $60.2K | ﹤0.01% |
3,815
+3,204
| +524% | +$56.7K |
2025 Q2
4 quarters
|
|
6115
PUT
Ring Energy
REI
$360M
| $60.2K | ﹤0.01% |
55,700
+3,500
| +7% | +$4.88K |
2021 Q1
21 quarters
|
|
6116
PUT
QuickLogic
QUIK
$173M
| $59.9K | ﹤0.01% |
3,000
+2,500
| +500% | +$43.6K |
2026 Q1
1 quarter
|
|
6117
CALL
Gilat Satellite Networks
GILT
$610M
| $59.9K | ﹤0.01% |
4,500
+1,500
| +50% | +$24.6K |
2026 Q1
1 quarter
|
|
6118
CALL
Trustmark
TRMK
$2.68B
| $59.8K | ﹤0.01% |
1,300
-200
| -13% | -$8.91K |
2024 Q3
7 quarters
|
|
6119
CALL
Playboy Inc
PLBY
$135M
| $59.8K | ﹤0.01% |
49,000
+45,900
| +1,481% | +$69.6K |
2021 Q1
21 quarters
|
|
6120
PUT
Frequency Electronics
FEIM
$797M
| $59.7K | ﹤0.01% |
900
+800
| +800% | +$49.2K |
2026 Q1
1 quarter
|
|
6121
PowerFleet Inc
AIOT
$361M
| $59.7K | ﹤0.01% |
15,581
+5,662
| +57% | +$19.9K |
2025 Q1
5 quarters
|
|
6122
Tarsus Pharmaceuticals
TARS
$3.31B
| $59.5K | ﹤0.01% |
946
-1,519
| -62% | -$97K |
2025 Q3
3 quarters
|
|
6123
CALL
Renaissance International IPO ETF
IPOS
$9.19M
| $59.4K | ﹤0.01% |
1,000
+700
| +233% | +$15.5K |
2026 Q1
1 quarter
|
|
6124
PUT
Quantum Corp
QMCO
$798M
| $59.4K | ﹤0.01% |
+5,400
| New | +$51.8K |
2026 Q2
0 quarters
|
|
6125
PUT
Badger Meter
BMI
$4.4B
| $59.4K | ﹤0.01% |
400
-400
| -50% | -$52.3K |
2025 Q3
3 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.