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 | |
|---|---|---|---|---|---|---|
301
CALL
Pinterest
PINS
$12.6B
| $51.2M | 0.03% |
1,763,900
+662,000
| +60% | +$20.8M |
|
302
PUT
Atlassian
TEAM
$21.8B
| $50.9M | 0.03% |
209,200
+24,900
| +14% | +$5.7M |
|
303
PUT
IonQ
IONQ
$13.3B
| $50.8M | 0.03% |
1,216,600
+1,035,200
| +571% | +$26M |
|
304
PUT
DoorDash
DASH
$77.9B
| $50.4M | 0.03% |
300,700
+31,600
| +12% | +$5.19M |
|
305
PUT
Astera Labs
ALAB
$57.4B
| $50.2M | 0.03% |
379,300
+267,500
| +239% | +$25.1M |
|
306
PUT
Bristol-Myers Squibb
BMY
$125B
| $49.9M | 0.03% |
881,900
-800,400
| -48% | -$44.7M |
|
307
CALL
First Solar
FSLR
$22.8B
| $49.8M | 0.03% |
282,300
-52,900
| -16% | -$10.5M |
|
308
PUT
Intuitive Surgical
ISRG
$122B
| $49.7M | 0.03% |
95,300
-41,100
| -30% | -$21.4M |
|
309
CALL
Blackrock
BLK
$161B
| $49.4M | 0.03% |
48,200
+9,300
| +24% | +$9.44M |
|
310
CALL
Progressive
PGR
$119B
| $49.1M | 0.03% |
204,900
-47,600
| -19% | -$12M |
|
311
Alibaba
BABA
$279B
| $49M | 0.03% |
578,106
-281,105
| -33% | -$26.6M |
|
312
CALL
ConocoPhillips
COP
$145B
| $49M | 0.03% |
511,500
+102,400
| +25% | +$10.9M |
|
313
CALL
Western Digital
WDC
$194B
| $49M | 0.03% |
1,086,712
-132,829
| -11% | -$6.68M |
|
314
PUT
DraftKings
DKNG
$11.4B
| $48.7M | 0.03% |
1,309,700
+53,400
| +4% | +$2.12M |
|
315
Citigroup
C
$224B
| $48.4M | 0.03% |
687,484
+398,558
| +138% | +$26.9M |
|
316
PUT
Lennar Class A
LEN
$19.7B
| $48.4M | 0.03% |
366,508
+13,325
| +4% | +$2.17M |
|
317
Advanced Micro Devices
AMD
$908B
| $48.1M | 0.03% |
398,387
+159,630
| +67% | +$23M |
|
318
PUT
Roblox
RBLX
$36.1B
| $47.6M | 0.03% |
822,800
+54,200
| +7% | +$2.73M |
|
319
PUT
Charter Communications
CHTR
$15.7B
| $47.6M | 0.03% |
138,800
+2,800
| +2% | +$1.01M |
|
320
CALL
Abbott
ABT
$175B
| $47.3M | 0.03% |
417,800
-53,200
| -11% | -$6.15M |
|
321
CALL
Unity
U
$12.7B
| $47.2M | 0.03% |
2,104,200
-271,100
| -11% | -$6.03M |
|
322
CALL
Lowe's Companies
LOW
$114B
| $46.7M | 0.03% |
189,400
-115,000
| -38% | -$30.7M |
|
323
CALL
SLB Ltd
SLB
$71B
| $46.6M | 0.03% |
1,216,300
+365,700
| +43% | +$15.4M |
|
|
ZVOL
324
CALL
Volatility Premium Plus ETF
ZVOL
$13.1M
| $46.5M | 0.03% |
991,700
+511,000
| +106% | +$10.1M |
|
325
PUT
Marathon Digital Holdings
MARA
$4.79B
| $46.3M | 0.03% |
2,760,600
+342,100
| +14% | +$6.92M |
|
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.