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 | |
|---|---|---|---|---|---|---|
4001
PUT
Compass
COMP
$8.73B
| $274K | ﹤0.01% |
31,500
-120,700
| -79% | -$956K |
|
4002
Leonardo DRS
DRS
$12.3B
| $273K | ﹤0.01% |
+8,315
| New | +$274K |
|
4003
CALL
Structure Therapeutics
GPCR
$3.38B
| $273K | ﹤0.01% |
15,800
-9,000
| -36% | -$220K |
|
4004
CALL
Interparfums
IPAR
$4.05B
| $273K | ﹤0.01% |
2,400
-1,800
| -43% | -$239K |
|
4005
CALL
Sonoco
SON
$5.9B
| $273K | ﹤0.01% |
5,800
+4,000
| +222% | +$189K |
|
4006
CALL
Vuzix
VUZI
$180M
| $273K | ﹤0.01% |
134,000
+12,200
| +10% | +$40K |
|
|
LB
4007
PUT
LandBridge Co
LB
$2.07B
| $273K | ﹤0.01% |
3,800
+3,100
| +443% | +$219K |
|
|
BAND
4008
CALL
Bandwidth Inc
BAND
$1.18B
| $272K | ﹤0.01% |
20,800
+13,400
| +181% | +$219K |
|
4009
CALL
Carlisle Companies
CSL
$13.4B
| $272K | ﹤0.01% |
800
-300
| -27% | -$108K |
|
4010
PUT
EVgo
EVGO
$223M
| $272K | ﹤0.01% |
102,400
-363,900
| -78% | -$1.13M |
|
4011
China Yuchai International
CYD
$1.72B
| $271K | ﹤0.01% |
15,961
+11,377
| +248% | +$175K |
|
4012
CALL
GrafTech
EAF
$197M
| $271K | ﹤0.01% |
31,020
+750
| +2% | +$9.75K |
|
|
JMIA
4013
CALL
Jumia Technologies
JMIA
$722M
| $271K | ﹤0.01% |
126,500
-106,400
| -46% | -$345K |
|
4014
CALL
Axos Financial
AX
$5.59B
| $270K | ﹤0.01% |
4,200
-11,100
| -73% | -$753K |
|
4015
CALL
Cadiz
CDZI
$261M
| $270K | ﹤0.01% |
92,400
+72,500
| +364% | +$319K |
|
4016
PUT
Syndax Pharmaceuticals
SNDX
$1.7B
| $270K | ﹤0.01% |
22,000
+21,600
| +5,400% | +$305K |
|
4017
CALL
Arbe Robotics
ARBE
$79.2M
| $269K | ﹤0.01% |
261,200
+235,300
| +908% | +$519K |
|
4018
PUT
Knight Transportation
KNX
$11.2B
| $269K | ﹤0.01% |
6,200
-21,400
| -78% | -$1.1M |
|
4019
PUT
Northern Oil and Gas
NOG
$2.22B
| $269K | ﹤0.01% |
8,900
-37,100
| -81% | -$1.27M |
|
4020
CALL
Omnicell
OMCL
$1.95B
| $269K | ﹤0.01% |
7,700
+6,500
| +542% | +$258K |
|
4021
CALL
Ondas Inc
ONDS
$4.3B
| $269K | ﹤0.01% |
251,900
+137,500
| +120% | +$206K |
|
4022
CALL
Pacific Biosciences
PACB
$444M
| $269K | ﹤0.01% |
228,800
-11,300
| -5% | -$17.3K |
|
4023
CALL
Principal Financial Group
PFG
$24.6B
| $269K | ﹤0.01% |
3,200
| – | – |
|
4024
CALL
Real Brokerage
REAX
$357M
| $269K | ﹤0.01% |
66,300
+64,800
| +4,320% | +$308K |
|
|
AMED
4025
CALL
DELISTED
Amedisys
AMED
| $268K | ﹤0.01% |
2,900
-2,400
| -45% | -$221K |
|
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.