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 | |
|---|---|---|---|---|---|---|
1176
PUT
American Electric Power
AEP
$73.4B
| $6.38M | ﹤0.01% |
61,500
-69,000
| -53% | -$7.18M |
|
1177
CALL
Lamb Weston
LW
$6.79B
| $6.36M | ﹤0.01% |
122,600
-98,100
| -44% | -$5.25M |
|
1178
CALL
Copart
CPRT
$25.2B
| $6.35M | ﹤0.01% |
129,500
+39,500
| +44% | +$2.21M |
|
1179
PUT
Robert Half
RHI
$3.87B
| $6.33M | ﹤0.01% |
154,200
+145,400
| +1,652% | +$6.62M |
|
1180
Mondelez International
MDLZ
$77.1B
| $6.31M | ﹤0.01% |
+93,519
| New | +$6.24M |
|
1181
PUT
United States Natural Gas Fund
UNG
$473M
| $6.3M | ﹤0.01% |
412,400
+211,400
| +105% | +$3.65M |
|
1182
CALL
Valaris
VAL
$5.48B
| $6.3M | ﹤0.01% |
149,600
-7,600
| -5% | -$286K |
|
1183
CALL
Sysco
SYY
$39.1B
| $6.29M | ﹤0.01% |
83,100
-28,600
| -26% | -$2.08M |
|
1184
PUT
Equinix
EQIX
$102B
| $6.28M | ﹤0.01% |
7,900
-1,500
| -16% | -$1.27M |
|
1185
CALL
Telephone and Data Systems
TDS
$3.83B
| $6.27M | ﹤0.01% |
176,300
+9,600
| +6% | +$337K |
|
1186
CALL
JPMorgan Inflation Managed Bond ETF
JCPI
$865M
| $6.27M | ﹤0.01% |
115,200
+18,400
| +19% | +$878K |
|
1187
CALL
Consolidated Edison
ED
$41.6B
| $6.24M | ﹤0.01% |
62,200
+27,900
| +81% | +$2.95M |
|
1188
PUT
Lumentum
LITE
$64.9B
| $6.22M | ﹤0.01% |
65,400
+5,400
| +9% | +$383K |
|
1189
PUT
UiPath
PATH
$5.28B
| $6.21M | ﹤0.01% |
485,600
-333,100
| -41% | -$4M |
|
1190
CALL
Frontline
FRO
$8.65B
| $6.21M | ﹤0.01% |
378,400
+56,300
| +17% | +$955K |
|
1191
PUT
SAP
SAP
$171B
| $6.2M | ﹤0.01% |
20,400
-4,900
| -19% | -$1.4M |
|
1192
TKO Group
TKO
$13.5B
| $6.2M | ﹤0.01% |
+34,096
| New | +$5.48M |
|
1193
CALL
Jabil
JBL
$33.7B
| $6.19M | ﹤0.01% |
28,400
-18,000
| -39% | -$2.92M |
|
1194
PUT
Deutsche Bank
DB
$65.3B
| $6.18M | ﹤0.01% |
211,100
+117,600
| +126% | +$3.11M |
|
1195
CALL
Sibanye-Stillwater
SBSW
$5.97B
| $6.16M | ﹤0.01% |
852,800
+482,900
| +131% | +$2.64M |
|
1196
CALL
Gold Fields
GFI
$28.9B
| $6.13M | ﹤0.01% |
259,200
+145,900
| +129% | +$3.35M |
|
1197
PUT
PagerDuty
PD
$666M
| $6.13M | ﹤0.01% |
401,100
+258,300
| +181% | +$4.01M |
|
1198
PUT
Stellantis
STLA
$16.7B
| $6.12M | ﹤0.01% |
609,800
+6,800
| +1% | +$67K |
|
1199
CALL
Carbon Collective Climate Solutions US Equity ETF
CCSO
$45.8M
| $6.11M | ﹤0.01% |
340,400
+77,400
| +29% | +$1.59M |
|
1200
CALL
Enbridge
ENB
$123B
| $6.1M | ﹤0.01% |
134,700
-124,400
| -48% | -$5.64M |
|
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.