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 | |
|---|---|---|---|---|---|---|
|
WCC
4601
PUT
WESCO International
WCC
$15.1B
| $155K | ﹤0.01% |
1,000
-35,900
| -97% | -$6.42M |
|
|
ASRT
4602
CALL
DELISTED
Assertio
ASRT
| $154K | ﹤0.01% |
15,260
-4,847
| -24% | -$57.8K |
|
4603
PUT
Helix Energy Solutions
HLX
$1.34B
| $154K | ﹤0.01% |
18,600
-10,000
| -35% | -$84.2K |
|
4604
PUT
AppFolio
APPF
$6.62B
| $153K | ﹤0.01% |
700
| – | – |
|
4605
PUT
Flywire
FLYW
$2.04B
| $153K | ﹤0.01% |
16,200
+14,800
| +1,057% | +$233K |
|
|
TDAY
4606
USA Today Co
TDAY
$1.29B
| $153K | ﹤0.01% |
53,079
-153,742
| -74% | -$643K |
|
4607
PUT
Target Hospitality
TH
$1.43B
| $153K | ﹤0.01% |
23,300
+6,100
| +35% | +$49K |
|
4608
Westrock Coffee
WEST
$798M
| $153K | ﹤0.01% |
+21,207
| New | +$139K |
|
4609
BrightSpring Health Services
BTSG
$13.6B
| $153K | ﹤0.01% |
8,508
+8,074
| +1,860% | +$159K |
|
|
4610
PUT
BrightSpring Health Services
BTSG
$13.6B
| $153K | ﹤0.01% |
+8,500
| New | +$167K |
|
|
BLD
4611
CALL
DELISTED
TopBuild
BLD
| $152K | ﹤0.01% |
500
-800
| -62% | -$256K |
|
4612
CALL
HUB Group
HUBG
$2.92B
| $152K | ﹤0.01% |
4,100
+100
| +3% | +$4.17K |
|
4613
CALL
Rekor Systems
REKR
$82.6M
| $152K | ﹤0.01% |
171,700
+88,500
| +106% | +$140K |
|
|
SII
4614
PUT
Sprott
SII
$2.68B
| $152K | ﹤0.01% |
3,400
+1,200
| +55% | +$51.7K |
|
4615
CALL
Solid Biosciences
SLDB
$792M
| $152K | ﹤0.01% |
41,300
+38,400
| +1,324% | +$164K |
|
4616
PUT
Unisys
UIS
$252M
| $152K | ﹤0.01% |
33,300
+27,400
| +464% | +$153K |
|
|
DAY
4617
DELISTED
Dayforce
DAY
| $152K | ﹤0.01% |
2,613
-54
| -2% | -$3.48K |
|
4618
CALL
Mission Produce
AVO
$1.14B
| $151K | ﹤0.01% |
14,500
-800
| -5% | -$9.32K |
|
4619
CALL
Birkenstock
BIRK
$7.64B
| $151K | ﹤0.01% |
3,300
-10,600
| -76% | -$558K |
|
4620
Buckle
BKE
$2.32B
| $151K | ﹤0.01% |
+3,949
| New | +$171K |
|
4621
PUT
Trevi Therapeutics
TRVI
$2.57B
| $151K | ﹤0.01% |
24,100
+9,100
| +61% | +$43.4K |
|
4622
Valero Energy
VLO
$89.5B
| $151K | ﹤0.01% |
1,146
-14,652
| -93% | -$1.94M |
|
|
LOGC
4623
DELISTED
ContextLogic
LOGC
| $151K | ﹤0.01% |
21,687
-77,815
| -78% | -$579K |
|
|
GLDD
4624
DELISTED
Great Lakes Dredge & Dock
GLDD
| $150K | ﹤0.01% |
+17,349
| New | +$173K |
|
4625
PUT
GoPro
GPRO
$120M
| $150K | ﹤0.01% |
227,000
+57,600
| +34% | +$50.8K |
|
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.