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 | |
|---|---|---|---|---|---|---|
7026
CALL
Innovative Solutions & Support
ISSC
$338M
| $11K | ﹤0.01% |
1,800
+400
| +29% | +$3.45K |
|
7027
PUT
Integer Holdings
ITGR
$3.39B
| $11K | ﹤0.01% |
+100
| New | +$13.1K |
|
7028
Kemper
KMPR
$1.82B
| $11K | ﹤0.01% |
165
+73
| +79% | +$4.84K |
|
7029
PUT
Lamar Advertising Co
LAMR
$16.4B
| $11K | ﹤0.01% |
100
-2,400
| -96% | -$292K |
|
7030
Leslie's
LESL
$10.1M
| $11K | ﹤0.01% |
763
+617
| +423% | +$18.9K |
|
|
7031
PUT
Leslie's
LESL
$10.1M
| $11K | ﹤0.01% |
750
+720
| +2,400% | +$22.1K |
|
7032
El Pollo Loco
LOCO
$499M
| $11K | ﹤0.01% |
+1,093
| New | +$12.4K |
|
7033
CALL
LXP Industrial Trust
LXP
$3.52B
| $11K | ﹤0.01% |
+260
| New | +$11.1K |
|
7034
Montauk Renewables
MNTK
$242M
| $11K | ﹤0.01% |
5,638
+5,519
| +4,638% | +$20.1K |
|
|
MODV
7035
DELISTED
ModivCare
MODV
| $11K | ﹤0.01% |
9,070
+6,184
| +214% | +$29.9K |
|
7036
Myriad Genetics
MYGN
$503M
| $11K | ﹤0.01% |
1,275
-206
| -14% | -$2.47K |
|
|
NINE
7037
CALL
DELISTED
Nine Energy Service
NINE
| $11K | ﹤0.01% |
9,800
-7,000
| -42% | -$8.6K |
|
|
NTST
7038
NETSTREIT Corp
NTST
$2.14B
| $11K | ﹤0.01% |
+742
| New | +$10.8K |
|
|
TEAD
7039
CALL
Teads Holding Co
TEAD
$78M
| $11K | ﹤0.01% |
3,200
-1,500
| -32% | -$8.47K |
|
|
ODP
7040
PUT
DELISTED
ODP
ODP
| $11K | ﹤0.01% |
800
-1,000
| -56% | -$19.2K |
|
7041
CALL
Puma Biotechnology
PBYI
$404M
| $11K | ﹤0.01% |
3,900
-9,000
| -70% | -$28.2K |
|
|
PDM
7042
PUT
Piedmont Realty Trust
PDM
$1.21B
| $11K | ﹤0.01% |
1,600
+900
| +129% | +$7.12K |
|
7043
PUT
Avita Medical
RCEL
$142M
| $11K | ﹤0.01% |
+1,400
| New | +$13.1K |
|
7044
PUT
Ring Energy
REI
$289M
| $11K | ﹤0.01% |
10,000
-5,500
| -35% | -$7.18K |
|
7045
PUT
Reynolds Consumer Products
REYN
$5.41B
| $11K | ﹤0.01% |
500
-1,300
| -72% | -$32.8K |
|
7046
CALL
Rimini Street
RMNI
$455M
| $11K | ﹤0.01% |
+3,300
| New | +$10.7K |
|
7047
CALL
Sally Beauty Holdings
SBH
$1.46B
| $11K | ﹤0.01% |
1,300
-2,800
| -68% | -$27.6K |
|
|
SFIX
7048
PUT
Stitch Fix
SFIX
$554M
| $11K | ﹤0.01% |
3,500
-82,600
| -96% | -$376K |
|
7049
Siebert Financial
SIEB
$67.6M
| $11K | ﹤0.01% |
+3,902
| New | +$10.8K |
|
7050
CALL
Silicon Laboratories
SLAB
$7.18B
| $11K | ﹤0.01% |
100
-2,200
| -96% | -$297K |
|
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.