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 | |
|---|---|---|---|---|---|---|
2601
Transmedics
TMDX
$2.5B
| $1.12M | ﹤0.01% |
16,641
-11,505
| -41% | -$791K |
|
2602
CALL
Rollins
ROL
$18.6B
| $1.12M | ﹤0.01% |
20,700
-5,400
| -21% | -$271K |
|
|
KNGS
2603
CALL
DELISTED
Roundhill S&P Dividend Monarchs ETF
KNGS
| $1.12M | ﹤0.01% |
30,700
-13,800
| -31% | -$502K |
|
2604
CALL
Maravai LifeSciences
MRVI
$997M
| $1.11M | ﹤0.01% |
504,400
+402,900
| +397% | +$1.59M |
|
2605
PUT
Louisiana-Pacific
LPX
$5.2B
| $1.11M | ﹤0.01% |
12,100
-20,400
| -63% | -$2.13M |
|
2606
PUT
OGE Energy
OGE
$10.3B
| $1.11M | ﹤0.01% |
24,200
+23,200
| +2,320% | +$1.01M |
|
2607
PUT
JFrog
FROG
$9.71B
| $1.11M | ﹤0.01% |
34,700
+29,600
| +580% | +$1.03M |
|
2608
CALL
Universal Health Services
UHS
$9.43B
| $1.11M | ﹤0.01% |
5,900
-1,300
| -18% | -$237K |
|
|
CVSA
2609
PUT
Covista Inc
CVSA
$3.94B
| $1.11M | ﹤0.01% |
11,000
+10,500
| +2,100% | +$1.05M |
|
2610
CALL
Seadrill
SDRL
$2.81B
| $1.11M | ﹤0.01% |
44,300
+42,800
| +2,853% | +$1.33M |
|
2611
Insmed
INSM
$23.2B
| $1.1M | ﹤0.01% |
14,467
-4,248
| -23% | -$325K |
|
|
DQ
2612
CALL
Daqo New Energy
DQ
$790M
| $1.1M | ﹤0.01% |
60,900
-19,000
| -24% | -$372K |
|
2613
CALL
Hamilton Insurance Group
HG
$3.59B
| $1.1M | ﹤0.01% |
53,200
-3,500
| -6% | -$68.3K |
|
2614
Yum! Brands
YUM
$41B
| $1.1M | ﹤0.01% |
+7,003
| New | +$1.01M |
|
2615
Shake Shack
SHAK
$2.3B
| $1.1M | ﹤0.01% |
+12,481
| New | +$1.35M |
|
2616
Synchrony
SYF
$23.7B
| $1.1M | ﹤0.01% |
20,764
-57,051
| -73% | -$3.53M |
|
2617
CALL
Textron
TXT
$16.6B
| $1.1M | ﹤0.01% |
15,200
-42,500
| -74% | -$3.18M |
|
2618
PUT
Gentex
GNTX
$4.88B
| $1.09M | ﹤0.01% |
47,000
+46,600
| +11,650% | +$1.19M |
|
2619
PUT
Spectrum Brands
SPB
$2.04B
| $1.09M | ﹤0.01% |
15,300
+12,400
| +428% | +$973K |
|
2620
Core Scientific
CORZ
$7.23B
| $1.09M | ﹤0.01% |
150,951
-596,002
| -80% | -$6.78M |
|
2621
Cummins
CMI
$91.7B
| $1.09M | ﹤0.01% |
+3,483
| New | +$1.23M |
|
|
DAY
2622
PUT
DELISTED
Dayforce
DAY
| $1.09M | ﹤0.01% |
18,700
-31,900
| -63% | -$2.06M |
|
2623
CALL
Alpha Metallurgical Resources
AMR
$1.82B
| $1.09M | ﹤0.01% |
8,700
-900
| -9% | -$146K |
|
2624
CALL
Equinox Gold
EQX
$7.32B
| $1.09M | ﹤0.01% |
158,400
-129,500
| -45% | -$830K |
|
2625
PUT
Clover Health Investments
CLOV
$2.28B
| $1.09M | ﹤0.01% |
303,200
-539,200
| -64% | -$2.17M |
|
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.