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 | |
|---|---|---|---|---|---|---|
5851
PUT
Cullen/Frost Bankers
CFR
$10.1B
| $77.3K | ﹤0.01% |
+500
| New | +$71K |
|
|
GREK
5852
Global X MSCI Greece ETF
GREK
$350M
| $77.2K | ﹤0.01% |
1,023
-15,969
| -94% | -$1.15M |
|
|
GEMI
5853
Gemini Space Station
GEMI
$607M
| $77.2K | ﹤0.01% |
+18,126
| New | +$85.4K |
|
|
BRR
5854
PUT
ProCap Financial Inc
BRR
$235M
| $77K | ﹤0.01% |
50,000
+4,900
| +11% | +$8.99K |
|
5855
Oric Pharmaceuticals
ORIC
$1.33B
| $77K | ﹤0.01% |
7,106
+5,758
| +427% | +$52.2K |
|
5856
Teucrium Agricultural Strategy No K-1 ETF
TILL
$42.7M
| $76.6K | ﹤0.01% |
4,430
+3,549
| +403% | +$63.6K |
|
|
GOOS
5857
Canada Goose Holdings
GOOS
$795M
| $76.6K | ﹤0.01% |
8,051
+2,052
| +34% | +$21.6K |
|
5858
Adient
ADNT
$1.54B
| $76.5K | ﹤0.01% |
4,162
+4,160
| +208,000% | +$88.9K |
|
|
SMST
5859
PUT
Defiance Daily Target 2x Short MSTR ETF
SMST
$19.6M
| $76.5K | ﹤0.01% |
7,100
+4,400
| +163% | +$192K |
|
5860
PUT
enGene Therapeutics
ENGN
$122M
| $76.5K | ﹤0.01% |
+44,200
| New | +$180K |
|
5861
CALL
Cato Corp
CATO
$51.8M
| $76.5K | ﹤0.01% |
23,600
-8,500
| -26% | -$25.9K |
|
5862
PUT
Viper Energy
VNOM
$15.9B
| $76.3K | ﹤0.01% |
1,800
-10,000
| -85% | -$462K |
|
5863
FTAI Infrastructure
FIP
$403M
| $76.3K | ﹤0.01% |
16,443
-3,942
| -19% | -$19.6K |
|
5864
CALL
Westamerica Bancorp
WABC
$1.37B
| $76.3K | ﹤0.01% |
1,300
| – | – |
|
5865
CALL
Utz Brands
UTZ
$1.26B
| $76.2K | ﹤0.01% |
9,900
-1,000
| -9% | -$7.46K |
|
|
GRCE
5866
CALL
Grace Therapeutics
GRCE
$44.2M
| $76K | ﹤0.01% |
33,500
+13,700
| +69% | +$37.9K |
|
5867
CALL
Yelp
YELP
$1.18B
| $76K | ﹤0.01% |
3,100
+500
| +19% | +$12.5K |
|
|
SLI
5868
CALL
Standard Lithium
SLI
$597M
| $75.9K | ﹤0.01% |
27,600
-205,600
| -88% | -$748K |
|
5869
PUT
StoneCo
STNE
$2.33B
| $75.9K | ﹤0.01% |
7,000
-500
| -7% | -$5.92K |
|
5870
CALL
Veeco
VECO
$2.73B
| $75.8K | ﹤0.01% |
+1,000
| New | +$57K |
|
5871
PUT
Axcelis
ACLS
$3.55B
| $75.8K | ﹤0.01% |
400
+300
| +300% | +$44.5K |
|
5872
PUT
Curtiss-Wright
CW
$20.9B
| $75.8K | ﹤0.01% |
100
-200
| -67% | -$147K |
|
5873
PUT
Centuri Holdings
CTRI
$2.07B
| $75.6K | ﹤0.01% |
2,500
+2,400
| +2,400% | +$77.5K |
|
5874
Bakkt Inc
BKKT
$375M
| $75.5K | ﹤0.01% |
+9,669
| New | +$86.6K |
|
5875
iShares MSCI Agriculture Producers ETF
VEGI
$167M
| $75.3K | ﹤0.01% |
1,708
+82
| +5% | +$3.67K |
|
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.