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 | |
|---|---|---|---|---|---|---|
2176
PUT
Antero Resources
AR
$10.8B
| $1.76M | ﹤0.01% |
50,100
-264,900
| -84% | -$9.75M |
|
2177
PUT
Kenvue
KVUE
$34.2B
| $1.76M | ﹤0.01% |
92,100
-39,000
| -30% | -$687K |
|
2178
CALL
Celcuity
CELC
$3.89B
| $1.76M | ﹤0.01% |
16,800
-24,800
| -60% | -$2.86M |
|
2179
PUT
Li Auto
LI
$11.2B
| $1.76M | ﹤0.01% |
149,600
-67,300
| -31% | -$1.1M |
|
|
OMDA
2180
CALL
Omada Health Inc
OMDA
$1.2B
| $1.76M | ﹤0.01% |
80,000
-23,700
| -23% | -$378K |
|
2181
CALL
Halozyme
HALO
$12.9B
| $1.75M | ﹤0.01% |
22,400
+13,800
| +160% | +$941K |
|
|
NTSK
2182
CALL
Netskope Inc
NTSK
$7.22B
| $1.75M | ﹤0.01% |
160,200
+98,900
| +161% | +$1.01M |
|
2183
PUT
Deckers Outdoor
DECK
$10.7B
| $1.75M | ﹤0.01% |
17,600
-8,300
| -32% | -$874K |
|
2184
PUT
Paycom
PAYC
$9.94B
| $1.75M | ﹤0.01% |
13,900
+13,600
| +4,533% | +$1.77M |
|
|
VMRK
2185
PUT
Vivmark Residential
VMRK
$47.6B
| $1.75M | ﹤0.01% |
25,700
-800
| -3% | -$51.8K |
|
2186
CALL
Absci
ABSI
$1.67B
| $1.74M | ﹤0.01% |
150,400
+33,400
| +29% | +$188K |
|
2187
CALL
Goldman Sachs Innovate Equity ETF
GINN
$197M
| $1.74M | ﹤0.01% |
28,500
+19,400
| +213% | +$1.47M |
|
2188
PUT
SoundHound AI
SOUN
$2.69B
| $1.74M | ﹤0.01% |
268,200
+55,300
| +26% | +$428K |
|
2189
PUT
Transmedics
TMDX
$2.96B
| $1.73M | ﹤0.01% |
26,100
+21,700
| +493% | +$1.84M |
|
2190
PUT
Ambarella
AMBA
$3.21B
| $1.73M | ﹤0.01% |
20,200
+15,800
| +359% | +$1.09M |
|
2191
CALL
Range Resources
RRC
$9.02B
| $1.73M | ﹤0.01% |
46,600
-25,400
| -35% | -$1.03M |
|
2192
PUT
FMC
FMC
$1.49B
| $1.73M | ﹤0.01% |
150,700
+40,800
| +37% | +$569K |
|
2193
Teucrium Sugar Fund
CANE
$66.1M
| $1.73M | ﹤0.01% |
176,761
+66,913
| +61% | +$647K |
|
2194
CALL
YieldMax TSLA Option Income Strategy ETF
TSLY
$692M
| $1.73M | ﹤0.01% |
91,100
-108,200
| -54% | -$3.17M |
|
2195
PUT
Noble Corp
NE
$6.84B
| $1.73M | ﹤0.01% |
46,300
-94,900
| -67% | -$4.54M |
|
2196
CALL
Black Hills Corp
BKH
$5.37B
| $1.73M | ﹤0.01% |
23,200
-3,700
| -14% | -$273K |
|
2197
PUT
Cogent Biosciences
COGT
$5.61B
| $1.73M | ﹤0.01% |
44,600
-106,100
| -70% | -$3.71M |
|
2198
PUT
Arthur J. Gallagher & Co
AJG
$59.2B
| $1.72M | ﹤0.01% |
7,500
-19,900
| -73% | -$4.23M |
|
2199
CALL
Travere Therapeutics
TVTX
$5.6B
| $1.72M | ﹤0.01% |
30,200
-71,400
| -70% | -$3.17M |
|
2200
Power Integrations
POWI
$2.92B
| $1.71M | ﹤0.01% |
20,467
+20,139
| +6,140% | +$1.45M |
|
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.