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 | |
|---|---|---|---|---|---|---|
2126
Alnylam Pharmaceuticals
ALNY
$36.3B
| $1.81M | ﹤0.01% |
6,704
+1,875
| +39% | +$482K |
|
2127
CALL
Jackson Financial
JXN
$8.32B
| $1.81M | ﹤0.01% |
21,600
+13,100
| +154% | +$1.16M |
|
2128
CALL
NexGen Energy
NXE
$6.05B
| $1.81M | ﹤0.01% |
403,100
+269,100
| +201% | +$1.59M |
|
2129
CALL
OSI Systems
OSIS
$3.57B
| $1.81M | ﹤0.01% |
9,300
+8,700
| +1,450% | +$1.66M |
|
|
HUYA
2130
Huya Inc
HUYA
$542M
| $1.8M | ﹤0.01% |
562,323
+478,707
| +573% | +$1.73M |
|
2131
PUT
Infosys
INFY
$45B
| $1.8M | ﹤0.01% |
98,900
+44,600
| +82% | +$926K |
|
2132
Blackstone Mortgage Trust
BXMT
$2.82B
| $1.8M | ﹤0.01% |
90,138
-88,700
| -50% | -$1.71M |
|
2133
CALL
Aurinia Pharmaceuticals
AUPH
$1.97B
| $1.8M | ﹤0.01% |
224,000
+64,800
| +41% | +$525K |
|
2134
CALL
Air Products & Chemicals
APD
$66.3B
| $1.8M | ﹤0.01% |
6,100
-17,700
| -74% | -$5.46M |
|
2135
CALL
Corteva
CTVA
$59.7B
| $1.8M | ﹤0.01% |
28,600
-89,500
| -76% | -$5.53M |
|
2136
CALL
Commault Systems
CVLT
$5.89B
| $1.8M | ﹤0.01% |
11,400
+300
| +3% | +$49.4K |
|
2137
PUT
Harrow
HROW
$1.43B
| $1.8M | ﹤0.01% |
67,600
+18,600
| +38% | +$557K |
|
2138
PUT
Velocity Financial
VEL
$683M
| $1.8M | ﹤0.01% |
96,100
-52,300
| -35% | -$984K |
|
2139
PUT
Keysight
KEYS
$54.5B
| $1.8M | ﹤0.01% |
12,000
-400
| -3% | -$66K |
|
2140
PUT
Yeti Holdings
YETI
$3.82B
| $1.8M | ﹤0.01% |
54,300
-16,000
| -23% | -$580K |
|
|
EXK
2141
CALL
Endeavour Silver
EXK
$2.32B
| $1.79M | ﹤0.01% |
420,600
+231,000
| +122% | +$928K |
|
2142
CALL
Accel Entertainment
ACEL
$979M
| $1.79M | ﹤0.01% |
180,900
+169,200
| +1,446% | +$1.84M |
|
2143
PUT
Ascendis Pharma A/S
ASND
$16.7B
| $1.79M | ﹤0.01% |
11,500
-3,900
| -25% | -$557K |
|
2144
CALL
Organon & Co
OGN
$3.55B
| $1.79M | ﹤0.01% |
120,100
+66,900
| +126% | +$1.03M |
|
|
BABO
2145
CALL
YieldMax BABA Option Income Strategy ETF
BABO
$13.7M
| $1.79M | ﹤0.01% |
88,800
+28,100
| +46% | +$551K |
|
2146
CALL
Immunovant
IMVT
$8.09B
| $1.78M | ﹤0.01% |
104,400
-28,100
| -21% | -$588K |
|
2147
CALL
ARK 21Shares Bitcoin ETF
ARKB
$2.45B
| $1.78M | ﹤0.01% |
65,100
+40,200
| +161% | +$1.25M |
|
2148
Valaris
VAL
$5.51B
| $1.78M | ﹤0.01% |
+45,400
| New | +$1.95M |
|
2149
PUT
ICICI Bank
IBN
$106B
| $1.78M | ﹤0.01% |
56,500
-158,000
| -74% | -$4.58M |
|
2150
Mobileye
MBLY
$2.03B
| $1.78M | ﹤0.01% |
123,647
+14,564
| +13% | +$238K |
|
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.