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 | |
|---|---|---|---|---|---|---|
4101
CALL
Piper Sandler
PIPR
$4.99B
| $247K | ﹤0.01% |
4,000
+400
| +11% | +$28.6K |
|
4102
PUT
Gaotu Techedu
GOTU
$413M
| $246K | ﹤0.01% |
75,900
+69,000
| +1,000% | +$191K |
|
4103
Hudbay
HBM
$9.85B
| $246K | ﹤0.01% |
+32,491
| New | +$265K |
|
4104
PUT
LegalZoom.com
LZ
$1.44B
| $246K | ﹤0.01% |
28,600
-48,100
| -63% | -$431K |
|
4105
PUT
Smith & Wesson
SWBI
$649M
| $246K | ﹤0.01% |
26,500
-32,700
| -55% | -$337K |
|
4106
ProShares VIX Short-Term Futures ETF
VIXY
$217M
| $246K | ﹤0.01% |
4,895
+2,177
| +80% | +$98.9K |
|
4107
American Superconductor
AMSC
$1.3B
| $245K | ﹤0.01% |
13,508
-7,704
| -36% | -$192K |
|
4108
PUT
Quantum-Si Incorporated
QSI
$155M
| $245K | ﹤0.01% |
204,700
+105,100
| +106% | +$201K |
|
4109
CALL
Alector
ALEC
$170M
| $243K | ﹤0.01% |
198,100
+71,100
| +56% | +$116K |
|
4110
PUT
AMC Global Media
AMCX
$456M
| $243K | ﹤0.01% |
35,400
+1,600
| +5% | +$13.4K |
|
|
GOLD
4111
CALL
Gold.com Inc
GOLD
$1.16B
| $243K | ﹤0.01% |
9,600
-10,000
| -51% | -$277K |
|
4112
PUT
Brighthouse Financial
BHF
$3.62B
| $243K | ﹤0.01% |
4,200
+2,500
| +147% | +$140K |
|
4113
iShares Select Dividend ETF
DVY
$23.8B
| $243K | ﹤0.01% |
+1,813
| New | +$243K |
|
4114
ProShares Ultra VIX Short-Term Futures ETF
UVXY
$252M
| $243K | ﹤0.01% |
2,078
-7,581
| -78% | -$784K |
|
4115
CALL
Apogee Therapeutics
APGE
$10.2B
| $242K | ﹤0.01% |
+6,500
| New | +$251K |
|
4116
PUT
Algonquin Power & Utilities
AQN
$4.59B
| $242K | ﹤0.01% |
47,200
+26,400
| +127% | +$125K |
|
4117
Beyond Meat
BYND
$275M
| $242K | ﹤0.01% |
79,361
-218,483
| -73% | -$804K |
|
4118
3D Systems Corp
DDD
$408M
| $242K | ﹤0.01% |
+114,161
| New | +$388K |
|
4119
PUT
Eversource Energy
ES
$28B
| $242K | ﹤0.01% |
3,900
+1,100
| +39% | +$65.6K |
|
4120
PUT
NCR Atleos
NATL
$3.51B
| $242K | ﹤0.01% |
9,200
-5,500
| -37% | -$164K |
|
|
AL
4121
CALL
DELISTED
Air Lease Corp
AL
| $241K | ﹤0.01% |
5,000
+4,700
| +1,567% | +$220K |
|
|
KEEL
4122
PUT
Keel Infrastructure Corp
KEEL
$1.97B
| $241K | ﹤0.01% |
306,900
-1,000
| -0.3% | -$1.32K |
|
|
CLPR
4123
PUT
Clipper Realty
CLPR
$46.5M
| $241K | ﹤0.01% |
63,000
+54,700
| +659% | +$230K |
|
4124
Dine Brands
DIN
$456M
| $241K | ﹤0.01% |
10,392
+4,416
| +74% | +$119K |
|
|
MAXN
4125
PUT
DELISTED
Maxeon Solar Technologies
MAXN
| $241K | ﹤0.01% |
82,000
-2,100
| -2% | -$10.7K |
|
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.