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 | |
|---|---|---|---|---|---|---|---|
7626
Costamare
CMRE
$1.69B
| $10.9K | ﹤0.01% |
774
+113
| +17% | +$1.85K |
2025 Q4
2 quarters
|
|
7627
PUT
TriplePoint Venture Growth BDC
TPVG
$175M
| $10.8K | ﹤0.01% |
2,200
+1,700
| +340% | +$9.11K |
2026 Q1
1 quarter
|
|
7628
PUT
Innovative Solutions & Support
IA
$352M
| $10.8K | ﹤0.01% |
600
+400
| +200% | +$7.74K |
2026 Q1
1 quarter
|
|
7629
CALL
Douglas Dynamics
PLOW
$918M
| $10.8K | ﹤0.01% |
200
| – | – |
2025 Q4
2 quarters
|
|
7630
Amplify CWP Enhanced Dividend Income ETF
DIVO
$7.95B
| $10.8K | ﹤0.01% |
236
-3,091
| -93% | -$141K |
2025 Q4
2 quarters
|
|
7631
CALL
NRC Health Common Stock
NRC
$485M
| $10.8K | ﹤0.01% |
500
-1,200
| -71% | -$22.3K |
2025 Q1
5 quarters
|
|
7632
CALL
Integra LifeSciences
IART
$926M
| $10.8K | ﹤0.01% |
+600
| New | +$8.39K |
2026 Q2
0 quarters
|
|
7633
State Street SPDR Portfolio Emerging Markets ETF
SPEM
$16.5B
| $10.8K | ﹤0.01% |
208
+181
| +670% | +$9.26K |
2026 Q1
1 quarter
|
|
7634
CALL
First Trust Asia Pacific ex-Japan AlphaDEX Fund
FPA
$108M
| $10.8K | ﹤0.01% |
+200
| New | +$10.3K |
2026 Q2
0 quarters
|
|
7635
PUT
New Mountain Finance
NMFC
$630M
| $10.8K | ﹤0.01% |
+1,500
| New | +$11.9K |
2026 Q2
0 quarters
|
|
7636
CALL
Worthington Enterprises
WOR
$3.14B
| $10.8K | ﹤0.01% |
200
-300
| -60% | -$16.7K |
2025 Q2
4 quarters
|
|
7637
CALL
Reynolds Consumer Products
REYN
$4.85B
| $10.7K | ﹤0.01% |
400
+300
| +300% | +$6.68K |
2025 Q3
3 quarters
|
|
7638
PUT
Byrna Technologies
BYRN
$113M
| $10.7K | ﹤0.01% |
1,600
-2,600
| -62% | -$16K |
2024 Q1
9 quarters
|
|
7639
CALL
US Gold Corp
USAU
$176M
| $10.7K | ﹤0.01% |
700
-200
| -22% | -$3.16K |
2024 Q2
8 quarters
|
|
7640
PUT
Everforth Inc
EFOR
$1.79B
| $10.7K | ﹤0.01% |
600
+200
| +50% | +$4.88K |
2026 Q1
1 quarter
|
|
7641
CALL
Brightstar Lottery PLC
BRSL
$1.73B
| $10.7K | ﹤0.01% |
1,000
-5,500
| -85% | -$65.3K |
2016 Q3
39 quarters
|
|
7642
Cogent Biosciences
COGT
$5.42B
| $10.7K | ﹤0.01% |
277
-2,876
| -91% | -$101K |
2026 Q1
1 quarter
|
|
7643
PUT
Lifestance Health
LFST
$4.92B
| $10.7K | ﹤0.01% |
1,000
-4,000
| -80% | -$30.9K |
2021 Q4
18 quarters
|
|
7644
PUT
Perimeter Solutions
PRM
$4.55B
| $10.7K | ﹤0.01% |
300
| – | – |
2025 Q2
4 quarters
|
|
7645
CALL
Usana Health Sciences
USNA
$258M
| $10.7K | ﹤0.01% |
500
-200
| -29% | -$3.76K |
2025 Q1
5 quarters
|
|
7646
PUT
Chimera Investment
CIM
$705M
| $10.7K | ﹤0.01% |
800
+100
| +14% | +$1.34K |
2018 Q4
30 quarters
|
|
7647
PUT
MakeMyTrip
MMYT
$3.96B
| $10.7K | ﹤0.01% |
200
-47,400
| -100% | -$2.16M |
2026 Q1
1 quarter
|
|
7648
Dyadic International
DYAI
$16M
| $10.6K | ﹤0.01% |
11,864
-214
| -2% | -$168 |
2025 Q2
4 quarters
|
|
7649
CALL
Cambria Tail Risk ETF
TAIL
$156M
| $10.6K | ﹤0.01% |
1,000
+700
| +233% | +$7.65K |
2023 Q4
10 quarters
|
|
7650
CALL
8x8 Inc
EGHT
$308M
| $10.6K | ﹤0.01% |
6,200
-7,400
| -54% | -$14.9K |
2024 Q2
8 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.