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 | |
|---|---|---|---|---|---|---|
7126
Nektar Therapeutics
NKTR
$2.39B
| $11K | ﹤0.01% |
845
+379
| +81% | +$6.68K |
|
7127
CALL
Orion
OEC
$403M
| $11K | ﹤0.01% |
700
-100
| -13% | -$1.69K |
|
7128
PUT
Odyssey Marine Exploration
OMEX
$37.7M
| $11K | ﹤0.01% |
16,500
-92,100
| -85% | -$46.6K |
|
7129
Oportun Financial
OPRT
$262M
| $11K | ﹤0.01% |
2,858
-16,350
| -85% | -$52.7K |
|
7130
CALL
PDS Biotechnology
PDSB
$37.4M
| $11K | ﹤0.01% |
6,900
-8,000
| -54% | -$21.2K |
|
7131
CALL
Precigen
PGEN
$1.94B
| $11K | ﹤0.01% |
10,400
-3,300
| -24% | -$2.81K |
|
7132
CALL
Douglas Dynamics
PLOW
$992M
| $11K | ﹤0.01% |
500
| – | – |
|
7133
PUT
Pinnacle Financial Partners Inc
PNFP
$15.8B
| $11K | ﹤0.01% |
100
| – | – |
|
|
REE
7134
PUT
DELISTED
REE Automotive
REE
| $11K | ﹤0.01% |
1,300
+700
| +117% | +$5.6K |
|
7135
CALL
Research Frontiers
REFR
$13.6M
| $11K | ﹤0.01% |
6,900
+900
| +15% | +$1.76K |
|
7136
CALL
Revvity
RVTY
$12.6B
| $11K | ﹤0.01% |
100
-1,700
| -94% | -$200K |
|
|
7137
PUT
Revvity
RVTY
$12.6B
| $11K | ﹤0.01% |
100
| – | – |
|
7138
PUT
Sana Biotechnology
SANA
$882M
| $11K | ﹤0.01% |
6,900
-25,400
| -79% | -$75.7K |
|
7139
Sabesp
SBS
$18.4B
| $11K | ﹤0.01% |
4,203
+3,935
| +1,468% | +$12K |
|
7140
Schwab Short-Term US Treasury ETF
SCHO
$12.8B
| $11K | ﹤0.01% |
486
-1,054
| -68% | -$25.5K |
|
|
BNKK
7141
Bonk Inc
BNKK
$7.7M
| $11K | ﹤0.01% |
459
-20
| -4% | -$689 |
|
7142
iShares 0-1 Year Treasury Bond ETF
SHV
$20.8B
| $11K | ﹤0.01% |
+100
| New | +$11K |
|
|
FIRY
7143
CALL
Firy Inc
FIRY
$154M
| $11K | ﹤0.01% |
7,900
-15,600
| -66% | -$83.2K |
|
7144
CALL
Solid Biosciences
SLDB
$792M
| $11K | ﹤0.01% |
2,900
-11,300
| -80% | -$62.1K |
|
7145
SmartRent
SMRT
$192M
| $11K | ﹤0.01% |
6,811
-50,747
| -88% | -$85K |
|
7146
State Street SPDR Portfolio Europe ETF
SPEU
$716M
| $11K | ﹤0.01% |
+277
| New | +$11.5K |
|
7147
CALL
Vishay Precision Group
VPG
$1.08B
| $11K | ﹤0.01% |
+500
| New | +$11.7K |
|
7148
VSE Corp
VSEC
$5.19B
| $11K | ﹤0.01% |
+119
| New | +$12.5K |
|
7149
PUT
Verastem
VSTM
$528M
| $11K | ﹤0.01% |
2,300
-600
| -21% | -$2.36K |
|
7150
CALL
Cactus
WHD
$3.63B
| $11K | ﹤0.01% |
+200
| New | +$12.6K |
|
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.