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 | |
|---|---|---|---|---|---|---|
5176
Amplitude
AMPL
$1.18B
| $88K | ﹤0.01% |
+8,715
| New | +$103K |
|
5177
PUT
AerSale
ASLE
$293M
| $88K | ﹤0.01% |
11,800
-1,800
| -13% | -$12.9K |
|
5178
Goosehead Insurance
GSHD
$2.2B
| $88K | ﹤0.01% |
+746
| New | +$83.7K |
|
5179
PUT
Kinetik
KNTK
$3.72B
| $88K | ﹤0.01% |
1,700
+1,600
| +1,600% | +$93.8K |
|
|
NVEE
5180
PUT
DELISTED
NV5 Global
NVEE
| $88K | ﹤0.01% |
4,600
| – | – |
|
5181
Tenable Holdings
TENB
$3.6B
| $88K | ﹤0.01% |
2,543
-453
| -15% | -$17.7K |
|
5182
CALL
Titan International
TWI
$466M
| $88K | ﹤0.01% |
10,500
+9,800
| +1,400% | +$81K |
|
5183
United States 12 Month Natural Gas Fund
UNL
$13.5M
| $88K | ﹤0.01% |
+8,613
| New | +$81K |
|
5184
CALL
ADT
ADT
$5.6B
| $87K | ﹤0.01% |
10,800
-2,900
| -21% | -$21.9K |
|
5185
Digital Turbine
APPS
$975M
| $87K | ﹤0.01% |
32,356
+25,123
| +347% | +$81.6K |
|
|
CGAU
5186
PUT
Centerra Gold
CGAU
$3.36B
| $87K | ﹤0.01% |
13,800
-12,000
| -47% | -$73.3K |
|
|
CHCT
5187
PUT
Community Healthcare Trust
CHCT
$523M
| $87K | ﹤0.01% |
4,800
+2,600
| +118% | +$49.6K |
|
5188
PUT
Dianthus Therapeutics
DNTH
$5.84B
| $87K | ﹤0.01% |
+4,800
| New | +$106K |
|
5189
PUT
Fortive
FTV
$17.9B
| $87K | ﹤0.01% |
1,592
-1,991
| -56% | -$117K |
|
5190
PUT
Global Net Lease
GNL
$1.84B
| $87K | ﹤0.01% |
10,900
-21,600
| -66% | -$162K |
|
5191
CALL
Horizon Bancorp
HBNC
$1.04B
| $87K | ﹤0.01% |
5,800
| – | – |
|
|
MSB
5192
PUT
Mesabi Trust
MSB
$289M
| $87K | ﹤0.01% |
3,200
+3,100
| +3,100% | +$84.8K |
|
5193
Park Hotels & Resorts
PK
$3.03B
| $87K | ﹤0.01% |
8,173
-19,105
| -70% | -$242K |
|
|
SPR
5194
DELISTED
Spirit AeroSystems
SPR
| $87K | ﹤0.01% |
2,541
-10,508
| -81% | -$359K |
|
5195
PUT
Sprout Social
SPT
$516M
| $87K | ﹤0.01% |
4,000
-5,100
| -56% | -$148K |
|
|
UCTT
5196
CALL
Ultra Clean Holdings
UCTT
$3.73B
| $87K | ﹤0.01% |
4,100
+2,500
| +156% | +$79.8K |
|
5197
UPAR Ultra Risk Parity ETF
UPAR
$58.6M
| $87K | ﹤0.01% |
6,327
-63
| -1% | -$852 |
|
|
WW
5198
CALL
DELISTED
WW International
WW
| $87K | ﹤0.01% |
167,400
-90,100
| -35% | -$78.3K |
|
|
CNR
5199
Core Natural Resources Inc
CNR
$4.02B
| $87K | ﹤0.01% |
+1,136
| New | +$96K |
|
5200
CDW
CDW
$18.9B
| $86K | ﹤0.01% |
+537
| New | +$97.6K |
|
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.