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 20+ Year Treasury Bond ETF
TLT
|
+$272M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$99M |
| 3 |
NVIDIA
NVDA
|
+$89.9M |
| 4 |
TSMC
TSM
|
+$87.7M |
| 5 |
Amazon
AMZN
|
+$61M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$518M |
| 2 |
Strategy Inc
MSTR
|
+$81.2M |
| 3 |
Alibaba
BABA
|
+$66.7M |
| 4 |
Advanced Micro Devices
AMD
|
+$44.3M |
| 5 |
Uber
UBER
|
+$41.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.41% |
| 2 | Consumer Discretionary | 0.22% |
| 3 | Healthcare | 0.17% |
| 4 | Communication Services | 0.15% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2151
CALL
Middleby
MIDD
$6.05B
| $1.78M | ﹤0.01% |
11,700
+2,500
| +27% | +$392K |
|
|
DFS
2152
CALL
DELISTED
Discover Financial Services
DFS
| $1.77M | ﹤0.01% |
10,400
-9,100
| -47% | -$1.66M |
|
2153
PUT
Conagra Brands
CAG
$7.07B
| $1.77M | ﹤0.01% |
66,500
-148,900
| -69% | -$3.84M |
|
|
DNB
2154
CALL
DELISTED
Dun & Bradstreet
DNB
| $1.77M | ﹤0.01% |
198,200
+177,400
| +853% | +$1.82M |
|
2155
CALL
BorgWarner
BWA
$13.2B
| $1.77M | ﹤0.01% |
61,700
+30,800
| +100% | +$934K |
|
2156
CALL
Altimmune
ALT
$539M
| $1.77M | ﹤0.01% |
353,200
-41,300
| -10% | -$262K |
|
2157
PUT
Warrior Met Coal
HCC
$4.23B
| $1.76M | ﹤0.01% |
37,000
+19,400
| +110% | +$990K |
|
2158
NextEra Energy
NEE
$187B
| $1.76M | ﹤0.01% |
24,864
-72,116
| -74% | -$5.09M |
|
2159
CALL
Energy Fuels
UUUU
$2.82B
| $1.76M | ﹤0.01% |
472,200
+145,700
| +45% | +$698K |
|
2160
CALL
AvalonBay Communities
AVB
$27.1B
| $1.76M | ﹤0.01% |
8,200
+6,900
| +531% | +$1.5M |
|
2161
PUT
Varonis Systems
VRNS
$5.25B
| $1.75M | ﹤0.01% |
43,400
+35,900
| +479% | +$1.54M |
|
2162
PUT
Ovintiv
OVV
$17.5B
| $1.75M | ﹤0.01% |
41,000
-55,600
| -58% | -$2.37M |
|
|
MZTI
2163
CALL
The Marzetti Company
MZTI
$2.94B
| $1.75M | ﹤0.01% |
10,000
-8,500
| -46% | -$1.53M |
|
2164
PUT
Douglas Emmett
DEI
$2.06B
| $1.75M | ﹤0.01% |
109,300
-82,700
| -43% | -$1.4M |
|
2165
Crocs
CROX
$6.69B
| $1.75M | ﹤0.01% |
16,453
+8,430
| +105% | +$874K |
|
2166
PUT
Praxis Precision Medicines
PRAX
$9.07B
| $1.75M | ﹤0.01% |
46,100
-3,200
| -6% | -$200K |
|
2167
Baxter International
BAX
$11.6B
| $1.74M | ﹤0.01% |
50,878
+29,628
| +139% | +$969K |
|
2168
CALL
Jacobs Solutions
J
$15.9B
| $1.74M | ﹤0.01% |
15,554
+4,242
| +38% | +$546K |
|
2169
Lamb Weston
LW
$6.82B
| $1.74M | ﹤0.01% |
32,627
-41,502
| -56% | -$2.35M |
|
|
VNET
2170
PUT
VNET Group
VNET
$2.05B
| $1.74M | ﹤0.01% |
+212,000
| New | +$1.94M |
|
2171
PUT
Genesis Energy
GEL
$1.84B
| $1.74M | ﹤0.01% |
110,700
+45,200
| +69% | +$551K |
|
2172
PUT
Golar LNG
GLNG
$4.95B
| $1.74M | ﹤0.01% |
45,700
-40,000
| -47% | -$1.57M |
|
2173
PUT
Sysco
SYY
$39.7B
| $1.73M | ﹤0.01% |
23,100
-15,700
| -40% | -$1.15M |
|
2174
PUT
InMode
INMD
$872M
| $1.73M | ﹤0.01% |
97,600
-38,500
| -28% | -$693K |
|
2175
CALL
Rockwell Automation
ROK
$51.4B
| $1.73M | ﹤0.01% |
6,700
-1,100
| -14% | -$306K |
|
Similar funds
Simplex Trading's Q1 2025 Portfolio in Review
As of Q1 2025, Simplex Trading held 10,070 positions worth $156B, down 13% from $179B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading withdrew a net $7.93B in Q1 2025, closing 1,547 positions and reducing 3,654 holdings. Its most notable exit was Alibaba, an estimated $66.7M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.68% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in iShares 20+ Year Treasury Bond ETF worth $278M.
- Simplex Trading's largest Q1 2025 buy was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M.
- Simplex Trading added most to NVIDIA in Q1 2025, an estimated $89.9M increase.
- Simplex Trading's biggest Q1 2025 reduction was Apple, cutting an estimated $518M.
- Simplex Trading fully exited Alibaba in Q1 2025, selling an estimated $66.7M.
- Simplex Trading's ten largest holdings make up 51% of its $156B portfolio in Q1 2025.
- Simplex Trading opened 1,566 new positions and closed 1,547 in Q1 2025.
- Simplex Trading's portfolio value fell 13% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q1 2025, filed 12 May 2025.