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 | |
|---|---|---|---|---|---|---|
|
NBIS
2351
Nebius Group N.V.
NBIS
$47.7B
| $1.69M | ﹤0.01% |
+61,018
| New | +$1.49M |
|
|
JOYY
2352
PUT
JOYY Inc
JOYY
$3.73B
| $1.69M | ﹤0.01% |
40,400
+40,000
| +10,000% | +$1.47M |
|
2353
PUT
DigitalOcean
DOCN
$14.4B
| $1.69M | ﹤0.01% |
49,600
-90,500
| -65% | -$3.55M |
|
2354
State Street SPDR Portfolio S&P 500 Growth ETF
SPYG
$50.7B
| $1.69M | ﹤0.01% |
19,174
+814
| +4% | +$70.3K |
|
2355
KE Holdings
BEKE
$16.8B
| $1.68M | ﹤0.01% |
+91,407
| New | +$1.88M |
|
2356
PUT
Xylem
XYL
$28.5B
| $1.68M | ﹤0.01% |
14,500
+11,700
| +418% | +$1.48M |
|
2357
PUT
Photronics
PLAB
$1.79B
| $1.68M | ﹤0.01% |
71,300
+51,200
| +255% | +$1.25M |
|
2358
CALL
Commault Systems
CVLT
$5.89B
| $1.68M | ﹤0.01% |
11,100
-4,800
| -30% | -$772K |
|
2359
CALL
Energy Fuels
UUUU
$2.82B
| $1.67M | ﹤0.01% |
326,500
+232,500
| +247% | +$1.44M |
|
2360
Direxion Daily CSI 300 China A Share Bull 2X ETF
CHAU
$90.3M
| $1.67M | ﹤0.01% |
+114,374
| New | +$1.89M |
|
2361
PUT
Ericsson
ERIC
$30.7B
| $1.66M | ﹤0.01% |
206,400
+25,800
| +14% | +$210K |
|
2362
Martin Marietta Materials
MLM
$33.6B
| $1.66M | ﹤0.01% |
3,221
+2,852
| +773% | +$1.62M |
|
2363
Scorpio Tankers
STNG
$3.96B
| $1.66M | ﹤0.01% |
+33,446
| New | +$1.91M |
|
|
ARR
2364
CALL
Armour Residential REIT
ARR
$2.02B
| $1.66M | ﹤0.01% |
88,000
+47,600
| +118% | +$913K |
|
2365
PUT
Aurinia Pharmaceuticals
AUPH
$1.97B
| $1.66M | ﹤0.01% |
184,800
-542,900
| -75% | -$4.43M |
|
2366
PUT
Deutsche Bank
DB
$66.3B
| $1.65M | ﹤0.01% |
96,900
-130,000
| -57% | -$2.24M |
|
2367
PUT
Fabrinet
FN
$17.1B
| $1.65M | ﹤0.01% |
7,500
+3,700
| +97% | +$892K |
|
2368
CALL
Global Ship Lease
GSL
$1.57B
| $1.64M | ﹤0.01% |
75,300
+6,400
| +9% | +$149K |
|
2369
PUT
Harrow
HROW
$1.43B
| $1.64M | ﹤0.01% |
49,000
-11,100
| -18% | -$491K |
|
2370
CALL
ImmunityBio
IBRX
$7.44B
| $1.64M | ﹤0.01% |
641,900
+18,800
| +3% | +$78.3K |
|
2371
iShares iBoxx $ Investment Grade Corporate Bond ETF
LQD
$34.7B
| $1.64M | ﹤0.01% |
+15,382
| New | +$1.68M |
|
2372
CALL
ZTO Express
ZTO
$18.2B
| $1.64M | ﹤0.01% |
84,000
+12,600
| +18% | +$276K |
|
|
MESO
2373
PUT
Mesoblast
MESO
$1.99B
| $1.64M | ﹤0.01% |
82,900
+40,200
| +94% | +$445K |
|
2374
PUT
Boyd Gaming
BYD
$6.47B
| $1.64M | ﹤0.01% |
22,600
-54,400
| -71% | -$3.82M |
|
2375
CALL
Praxis Precision Medicines
PRAX
$9.07B
| $1.64M | ﹤0.01% |
21,300
-1,100
| -5% | -$79.6K |
|
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.