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 |
NVIDIA
NVDA
|
+$172M |
| 2 |
Apple
AAPL
|
+$156M |
| 3 |
Broadcom
AVGO
|
+$101M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$57.2M |
| 5 |
UnitedHealth
UNH
|
+$55.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$140M |
| 2 |
Amazon
AMZN
|
+$47.9M |
| 3 |
Netflix
NFLX
|
+$38.3M |
| 4 |
TSMC
TSM
|
+$37.3M |
| 5 |
Pfizer
PFE
|
+$36.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.74% |
| 2 | Communication Services | 0.19% |
| 3 | Consumer Discretionary | 0.18% |
| 4 | Healthcare | 0.17% |
| 5 | Financials | 0.14% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2151
PUT
Sherwin-Williams
SHW
$78.3B
| $1.92M | ﹤0.01% |
5,600
+2,500
| +81% | +$866K |
|
|
SNDK
2152
Sandisk
SNDK
$213B
| $1.92M | ﹤0.01% |
42,337
+21,184
| +100% | +$810K |
|
2153
CALL
Ascendis Pharma A/S
ASND
$16.7B
| $1.92M | ﹤0.01% |
11,100
+7,900
| +247% | +$1.29M |
|
2154
Hecla Mining
HL
$10.2B
| $1.92M | ﹤0.01% |
319,855
+81,994
| +34% | +$452K |
|
2155
Akamai
AKAM
$16.8B
| $1.91M | ﹤0.01% |
+23,968
| New | +$1.86M |
|
|
QLTB
2156
CALL
DELISTED
ISHARES BAA BA RATED CORP BOND FUND
QLTB
| $1.91M | ﹤0.01% |
11,200
+5,500
| +96% | +$938K |
|
2157
PUT
Phathom Pharmaceuticals
PHAT
$912M
| $1.91M | ﹤0.01% |
199,200
+155,300
| +354% | +$859K |
|
2158
CALL
Invesco
IVZ
$13.3B
| $1.91M | ﹤0.01% |
120,900
+59,800
| +98% | +$859K |
|
2159
PUT
Molina Healthcare
MOH
$10.3B
| $1.91M | ﹤0.01% |
6,400
+3,300
| +106% | +$1.04M |
|
2160
CALL
Quest Diagnostics
DGX
$25.1B
| $1.9M | ﹤0.01% |
10,600
+400
| +4% | +$69.5K |
|
2161
CALL
Asana
ASAN
$1.58B
| $1.9M | ﹤0.01% |
141,000
-76,500
| -35% | -$1.2M |
|
|
PONY
2162
Pony AI Inc
PONY
$3.1B
| $1.9M | ﹤0.01% |
+144,207
| New | +$1.74M |
|
2163
CALL
Universal Health Services
UHS
$9.43B
| $1.9M | ﹤0.01% |
10,500
+4,600
| +78% | +$830K |
|
2164
Golar LNG
GLNG
$4.95B
| $1.9M | ﹤0.01% |
46,102
+1,780
| +4% | +$70.2K |
|
|
ARI
2165
Apollo Commercial Real Estate
ARI
$887M
| $1.9M | ﹤0.01% |
195,979
-1,018
| -0.5% | -$9.59K |
|
2166
Enovix
ENVX
$862M
| $1.9M | ﹤0.01% |
209,678
-343,748
| -62% | -$2.24M |
|
2167
NCR Voyix
VYX
$1.06B
| $1.89M | ﹤0.01% |
161,388
+117,634
| +269% | +$1.19M |
|
2168
CALL
Bentley Systems
BSY
$9.54B
| $1.88M | ﹤0.01% |
34,900
+14,600
| +72% | +$676K |
|
2169
PUT
Cal-Maine
CALM
$4.28B
| $1.88M | ﹤0.01% |
18,900
-43,100
| -70% | -$4.12M |
|
|
GOOS
2170
CALL
Canada Goose Holdings
GOOS
$868M
| $1.88M | ﹤0.01% |
168,200
+33,100
| +25% | +$321K |
|
2171
Conagra Brands
CAG
$7.07B
| $1.88M | ﹤0.01% |
91,812
+51,578
| +128% | +$1.21M |
|
2172
PUT
Rithm Capital
RITM
$5.09B
| $1.88M | ﹤0.01% |
166,400
+200
| +0.1% | +$2.2K |
|
2173
PUT
Trex
TREX
$4.51B
| $1.88M | ﹤0.01% |
34,500
+27,600
| +400% | +$1.56M |
|
|
CNR
2174
PUT
Core Natural Resources Inc
CNR
$4.19B
| $1.88M | ﹤0.01% |
26,900
+22,700
| +540% | +$1.61M |
|
2175
Darling Ingredients
DAR
$9.93B
| $1.88M | ﹤0.01% |
49,433
+2,163
| +5% | +$71.2K |
|
Similar funds
Simplex Trading's Q2 2025 Portfolio in Review
As of Q2 2025, Simplex Trading held 10,048 positions worth $175B, up 12% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading withdrew a net $10.5B in Q2 2025, closing 1,431 positions and reducing 3,590 holdings. Its most notable exit was Constellation Energy, an estimated $35.8M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.74% of assets, up from 0.41% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in State Street SPDR S&P 500 ETF Trust worth $61.9M.
- Simplex Trading's largest Q2 2025 buy was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M.
- Simplex Trading added most to NVIDIA in Q2 2025, an estimated $172M increase.
- Simplex Trading's biggest Q2 2025 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $140M.
- Simplex Trading fully exited Constellation Energy in Q2 2025, selling an estimated $35.8M.
- Simplex Trading's ten largest holdings make up 47% of its $175B portfolio in Q2 2025.
- Simplex Trading opened 1,525 new positions and closed 1,431 in Q2 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $175B.
Based on Simplex Trading's 13F filing for Q2 2025, filed 5 Aug 2025.