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 | |
|---|---|---|---|---|---|---|
1101
American Tower
AMT
$78.8B
| $5.83M | ﹤0.01% |
35,639
+12,131
| +52% | +$2.18M |
|
1102
PUT
Peloton Interactive
PTON
$2.16B
| $5.79M | ﹤0.01% |
979,700
-11,800
| -1% | -$63.7K |
|
1103
CALL
CRH
CRH
$56.6B
| $5.79M | ﹤0.01% |
54,100
-600
| -1% | -$66K |
|
1104
PUT
Trump Media & Technology Group
DJT
$2.54B
| $5.78M | ﹤0.01% |
746,800
+3,600
| +0.5% | +$31.7K |
|
1105
Bristol-Myers Squibb
BMY
$128B
| $5.77M | ﹤0.01% |
+100,185
| New | +$5.75M |
|
1106
PUT
Welltower
WELL
$167B
| $5.74M | ﹤0.01% |
25,300
+21,400
| +549% | +$4.52M |
|
1107
PUT
General Mills
GIS
$18B
| $5.74M | ﹤0.01% |
165,000
-61,000
| -27% | -$2.11M |
|
1108
PUT
Cheniere Energy
LNG
$55.5B
| $5.74M | ﹤0.01% |
24,000
-5,400
| -18% | -$1.35M |
|
1109
CALL
SentinelOne
S
$7.79B
| $5.73M | ﹤0.01% |
337,600
-147,600
| -30% | -$2.27M |
|
1110
PUT
Sunrun
RUN
$1.95B
| $5.73M | ﹤0.01% |
428,100
+49,700
| +13% | +$671K |
|
1111
PUT
CF Industries
CF
$17.4B
| $5.73M | ﹤0.01% |
52,900
-72,300
| -58% | -$8.52M |
|
1112
PUT
Chubb
CB
$129B
| $5.72M | ﹤0.01% |
16,800
+9,700
| +137% | +$3.16M |
|
1113
PUT
Energy Fuels
UUUU
$3.01B
| $5.71M | ﹤0.01% |
393,700
-221,300
| -36% | -$4.07M |
|
1114
CALL
Dominion Energy
D
$53.4B
| $5.7M | ﹤0.01% |
83,500
-9,300
| -10% | -$605K |
|
1115
CALL
NextNav
NN
$2.43B
| $5.7M | ﹤0.01% |
319,600
-31,800
| -9% | -$615K |
|
1116
PUT
Sherwin-Williams
SHW
$79.9B
| $5.68M | ﹤0.01% |
16,500
+13,500
| +450% | +$4.31M |
|
1117
Applied Digital
APLD
$7.46B
| $5.67M | ﹤0.01% |
151,952
+83,217
| +121% | +$3.21M |
|
1118
CALL
Sony
SONY
$138B
| $5.66M | ﹤0.01% |
293,700
+135,800
| +86% | +$2.86M |
|
1119
CALL
Phillips 66
PSX
$102B
| $5.66M | ﹤0.01% |
33,500
-25,600
| -43% | -$4.41M |
|
1120
Cardinal Health
CAH
$51B
| $5.66M | ﹤0.01% |
23,835
-1,872
| -7% | -$389K |
|
1121
CALL
Centrus Energy
LEU
$3.01B
| $5.66M | ﹤0.01% |
33,700
-7,900
| -19% | -$1.48M |
|
|
1122
CALL
Chubb
CB
$129B
| $5.66M | ﹤0.01% |
16,600
-3,400
| -17% | -$1.11M |
|
1123
CALL
HCA Healthcare
HCA
$94.3B
| $5.65M | ﹤0.01% |
14,500
+1,400
| +11% | +$592K |
|
|
NASA
1124
Tema Space Innovators ETF
NASA
$5.18B
| $5.64M | ﹤0.01% |
+185,610
| New | +$5.93M |
|
1125
PUT
Ares Capital
ARCC
$13.8B
| $5.64M | ﹤0.01% |
304,200
-86,900
| -22% | -$1.62M |
|
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.