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 |
Apple
AAPL
|
+$552M |
| 2 |
Strategy Inc
MSTR
|
+$85.8M |
| 3 |
MSTX
Defiance Daily Target 2x Long MSTR ETF
MSTX
|
+$48.1M |
| 4 |
Intel
INTC
|
+$45.4M |
| 5 |
Uber
UBER
|
+$43M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$133M |
| 2 |
Pinduoduo
PDD
|
+$82.6M |
| 3 |
Boeing
BA
|
+$49.8M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$45.1M |
| 5 |
Microsoft
MSFT
|
+$41M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.68% |
| 2 | Consumer Discretionary | 0.23% |
| 3 | Healthcare | 0.19% |
| 4 | Financials | 0.13% |
| 5 | Communication Services | 0.11% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
4276
Ultragenyx Pharmaceutical
RARE
$2.56B
| $249K | ﹤0.01% |
5,929
-4,418
| -43% | -$219K |
|
4277
CALL
Vestis
VSTS
$2.03B
| $249K | ﹤0.01% |
16,400
-8,800
| -35% | -$132K |
|
4278
Axsome Therapeutics
AXSM
$12.1B
| $248K | ﹤0.01% |
2,942
-12,714
| -81% | -$1.17M |
|
4279
PUT
Huntsman Corp
HUN
$2B
| $248K | ﹤0.01% |
13,800
-19,800
| -59% | -$412K |
|
4280
CALL
Option Care Health
OPCH
$3.53B
| $248K | ﹤0.01% |
10,700
-8,300
| -44% | -$210K |
|
4281
CALL
Pricesmart
PSMT
$5.9B
| $248K | ﹤0.01% |
2,700
+2,200
| +440% | +$201K |
|
4282
PUT
Candel Therapeutics
CADL
$709M
| $247K | ﹤0.01% |
28,500
+20,300
| +248% | +$120K |
|
4283
PUT
DigitalBridge
DBRG
$2.93B
| $247K | ﹤0.01% |
21,900
-265,100
| -92% | -$3.56M |
|
4284
CALL
InflaRx
IFRX
$249M
| $247K | ﹤0.01% |
100,200
-6,000
| -6% | -$11.5K |
|
4285
CALL
Principal Financial Group
PFG
$24.5B
| $247K | ﹤0.01% |
3,200
-2,800
| -47% | -$236K |
|
|
PPTA
4286
CALL
Perpetua Resources
PPTA
$2.18B
| $247K | ﹤0.01% |
23,200
+15,900
| +218% | +$163K |
|
4287
CALL
ASP Isotopes
ASPI
$475M
| $246K | ﹤0.01% |
+54,500
| New | +$290K |
|
4288
CALL
Evergy
EVRG
$19.7B
| $246K | ﹤0.01% |
4,000
-1,200
| -23% | -$74.2K |
|
4289
PUT
Meritage Homes
MTH
$4.89B
| $246K | ﹤0.01% |
3,200
+400
| +14% | +$36.5K |
|
4290
PennyMac Financial
PFSI
$4.45B
| $246K | ﹤0.01% |
+2,416
| New | +$253K |
|
|
PNNT
4291
CALL
Pennant Park Investment Corp
PNNT
$221M
| $246K | ﹤0.01% |
34,800
-42,900
| -55% | -$297K |
|
4292
TORM
TRMD
$3.05B
| $246K | ﹤0.01% |
12,667
-5,350
| -30% | -$130K |
|
4293
CALL
Twist Bioscience
TWST
$5.51B
| $246K | ﹤0.01% |
5,300
+600
| +13% | +$27.1K |
|
|
INFN
4294
PUT
DELISTED
Infinera Corporation Common Stock
INFN
| $246K | ﹤0.01% |
37,500
+16,100
| +75% | +$107K |
|
4295
Akebia Therapeutics
AKBA
$341M
| $245K | ﹤0.01% |
+128,982
| New | +$224K |
|
4296
ATS Corp
ATS
$2.62B
| $245K | ﹤0.01% |
+8,065
| New | +$245K |
|
4297
PUT
Emergent Biosolutions
EBS
$377M
| $245K | ﹤0.01% |
25,700
-9,700
| -27% | -$89K |
|
4298
Service Corp International
SCI
$11.7B
| $245K | ﹤0.01% |
3,073
-871
| -22% | -$71.2K |
|
4299
PUT
Spectrum Brands
SPB
$2.08B
| $245K | ﹤0.01% |
2,900
+1,400
| +93% | +$127K |
|
|
CNH
4300
CALL
CNH Industrial
CNH
$14.2B
| $245K | ﹤0.01% |
21,700
-10,500
| -33% | -$119K |
|
Similar funds
Simplex Trading's Q4 2024 Portfolio in Review
As of Q4 2024, Simplex Trading held 10,008 positions worth $179B, up 4.8% from $170B the previous quarter. Its ten largest holdings account for 49% of the portfolio.
Simplex Trading's Q4 2024 filing shows 1,520 new, 3,222 increased, 3,616 reduced and 1,504 closed positions. Its largest new stake was Strategy Inc: 285,022 shares worth $82.5M. The largest sale was NVIDIA, an estimated $133M.
By sector, the portfolio is most concentrated in Technology at 0.68% of assets, up from 0.4% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q4 2024 buy was Strategy Inc: 285,022 shares worth $82.5M.
- Simplex Trading added most to Apple in Q4 2024, an estimated $552M increase.
- Simplex Trading's biggest Q4 2024 reduction was NVIDIA, cutting an estimated $133M.
- Simplex Trading fully exited Pinduoduo in Q4 2024, selling an estimated $82.6M.
- Simplex Trading's ten largest holdings make up 49% of its $179B portfolio in Q4 2024.
- Simplex Trading opened 1,520 new positions and closed 1,504 in Q4 2024.
- Simplex Trading's portfolio value rose 4.8% quarter-over-quarter to $179B.
Based on Simplex Trading's 13F filing for Q4 2024, filed 11 Feb 2025.