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 | |
|---|---|---|---|---|---|---|
226
PUT
KKR & Co
KKR
$86.1B
| $71.2M | 0.04% |
481,600
+178,700
| +59% | +$26.2M |
|
227
PUT
MongoDB
MDB
$24.2B
| $71.2M | 0.04% |
305,900
+87,400
| +40% | +$24.7M |
|
228
CALL
Sea Limited
SE
$64.2B
| $70.7M | 0.04% |
666,700
-60,100
| -8% | -$6.32M |
|
229
PUT
lululemon athletica
LULU
$12.8B
| $70.7M | 0.04% |
184,900
-80,900
| -30% | -$26.4M |
|
230
CALL
Carnival Corporation Ltd
CCL
$35.7B
| $70.3M | 0.04% |
2,822,900
-1,296,900
| -31% | -$30.4M |
|
231
CALL
Baidu
BIDU
$36.6B
| $70.1M | 0.04% |
830,900
+24,700
| +3% | +$2.26M |
|
232
CALL
Roblox
RBLX
$36.2B
| $69.9M | 0.04% |
1,207,400
-194,800
| -14% | -$9.8M |
|
233
CALL
Amgen
AMGN
$199B
| $69.7M | 0.04% |
267,400
+54,800
| +26% | +$16.3M |
|
|
234
CALL
lululemon athletica
LULU
$12.8B
| $69.6M | 0.04% |
182,100
-115,400
| -39% | -$37.7M |
|
235
CALL
Newmont
NEM
$103B
| $69.6M | 0.04% |
1,870,100
+342,800
| +22% | +$15.6M |
|
236
PUT
Arista Networks
ANET
$219B
| $68.7M | 0.04% |
621,500
-404,900
| -39% | -$41.6M |
|
237
PUT
Dick's Sporting Goods
DKS
$18.6B
| $68M | 0.04% |
297,300
+152,700
| +106% | +$32M |
|
238
CALL
American Airlines Group
AAL
$9.91B
| $67.5M | 0.04% |
3,871,400
-791,400
| -17% | -$11.4M |
|
239
CALL
Procter & Gamble
PG
$348B
| $67.3M | 0.04% |
401,400
+28,600
| +8% | +$4.87M |
|
240
CALL
Applied Materials
AMAT
$443B
| $67.3M | 0.04% |
413,700
-10,500
| -2% | -$1.9M |
|
241
PUT
CVS Health
CVS
$140B
| $67.2M | 0.04% |
1,496,100
+12,200
| +0.8% | +$684K |
|
242
PUT
Rivian
RIVN
$25.4B
| $67.1M | 0.04% |
5,044,800
+408,700
| +9% | +$4.7M |
|
243
PUT
Occidental Petroleum
OXY
$57.1B
| $66.9M | 0.04% |
1,354,600
-412,600
| -23% | -$20.8M |
|
244
CALL
Workday
WDAY
$33.1B
| $66.8M | 0.04% |
258,700
-51,400
| -17% | -$13.1M |
|
245
CALL
Marathon Digital Holdings
MARA
$4.76B
| $66.5M | 0.04% |
3,966,600
+1,216,000
| +44% | +$24.6M |
|
246
CALL
Estee Lauder
EL
$29.8B
| $66.2M | 0.04% |
882,800
+413,400
| +88% | +$32.6M |
|
247
PUT
Airbnb
ABNB
$83.8B
| $65.7M | 0.04% |
499,900
+23,400
| +5% | +$3.15M |
|
248
CALL
Energy Transfer Partners
ET
$70.5B
| $65.7M | 0.04% |
3,352,600
+1,261,800
| +60% | +$22.3M |
|
249
CALL
Lam Research
LRCX
$397B
| $65.4M | 0.04% |
905,800
+81,800
| +10% | +$6.2M |
|
250
CALL
State Street SPDR Portfolio Short Term Treasury ETF
SPTS
$6.07B
| $65.1M | 0.04% |
532,800
-152,900
| -22% | -$4.45M |
|
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.