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 | |
|---|---|---|---|---|---|---|
6351
Jazz Pharmaceuticals
JAZZ
$15.9B
| $30K | ﹤0.01% |
247
-1,824
| -88% | -$215K |
|
6352
CALL
Mizuho Financial
MFG
$127B
| $30K | ﹤0.01% |
+6,300
| New | +$29.1K |
|
|
MODV
6353
PUT
DELISTED
ModivCare
MODV
| $30K | ﹤0.01% |
2,600
+1,800
| +225% | +$28.5K |
|
6354
NovaGold Resources
NG
$2.56B
| $30K | ﹤0.01% |
9,102
-2,766
| -23% | -$9.77K |
|
6355
CALL
NanoViricides
NNVC
$38.8M
| $30K | ﹤0.01% |
21,400
+10,400
| +95% | +$14.9K |
|
|
ONL
6356
Orion Office REIT
ONL
$150M
| $30K | ﹤0.01% |
+8,308
| New | +$32.7K |
|
6357
CALL
Penske Automotive Group
PAG
$14.3B
| $30K | ﹤0.01% |
200
-14,600
| -99% | -$2.32M |
|
6358
Penumbra
PEN
$12.7B
| $30K | ﹤0.01% |
+128
| New | +$29.1K |
|
6359
Post Holdings
POST
$4.14B
| $30K | ﹤0.01% |
268
-12,371
| -98% | -$1.41M |
|
6360
CALL
Protagonist Therapeutics
PTGX
$8.79B
| $30K | ﹤0.01% |
800
-2,000
| -71% | -$87.2K |
|
6361
Red Robin
RRGB
$145M
| $30K | ﹤0.01% |
5,480
-20,243
| -79% | -$110K |
|
6362
PUT
Synaptics
SYNA
$4.19B
| $30K | ﹤0.01% |
400
-1,600
| -80% | -$121K |
|
6363
PUT
Telecom Argentina
TEO
$6.03B
| $30K | ﹤0.01% |
2,400
+1,700
| +243% | +$18.8K |
|
6364
PUT
Turning Point Brands
TPB
$1.45B
| $30K | ﹤0.01% |
500
-100
| -17% | -$5.34K |
|
6365
CALL
Mammoth Energy Services
TUSK
$128M
| $30K | ﹤0.01% |
10,300
-6,700
| -39% | -$24.7K |
|
6366
PUT
Frontier Group Holdings
ULCC
$1.55B
| $30K | ﹤0.01% |
4,300
+1,500
| +54% | +$9.36K |
|
6367
iShares MSCI Agriculture Producers ETF
VEGI
$148M
| $30K | ﹤0.01% |
+854
| New | +$31.8K |
|
6368
PUT
Virco
VIRC
$95.2M
| $30K | ﹤0.01% |
3,000
-15,700
| -84% | -$220K |
|
6369
PUT
GeneDx Holdings
WGS
$1.93B
| $30K | ﹤0.01% |
400
-5,500
| -93% | -$384K |
|
6370
PUT
Wyndham Hotels & Resorts
WH
$5.56B
| $30K | ﹤0.01% |
+300
| New | +$27.8K |
|
6371
Roundhill Daily 2X Long Magnificent Seven ETF
MAGX
$54M
| $30K | ﹤0.01% |
650
+220
| +51% | +$9.19K |
|
6372
Assurant
AIZ
$13.8B
| $29K | ﹤0.01% |
137
-275
| -67% | -$57.2K |
|
6373
CALL
Amphastar Pharmaceuticals
AMPH
$879M
| $29K | ﹤0.01% |
800
-1,000
| -56% | -$45.7K |
|
6374
CALL
Cumberland Pharmaceuticals
CPIX
$100M
| $29K | ﹤0.01% |
+12,300
| New | +$18.1K |
|
|
CRESY
6375
CALL
Cresud
CRESY
$795M
| $29K | ﹤0.01% |
2,319
-1,412
| -38% | -$15.4K |
|
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.