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 | |
|---|---|---|---|---|---|---|
151
PUT
Starbucks
SBUX
$119B
| $112M | 0.06% |
1,230,400
-366,000
| -23% | -$35.4M |
|
152
CALL
Arm
ARM
$309B
| $112M | 0.06% |
907,200
-122,300
| -12% | -$17.2M |
|
153
CALL
AbbVie
ABBV
$448B
| $111M | 0.06% |
624,900
+87,200
| +16% | +$16M |
|
154
CALL
Johnson & Johnson
JNJ
$599B
| $110M | 0.06% |
761,600
+27,900
| +4% | +$4.32M |
|
155
CALL
Direxion Daily Technology Bull 3x ETF
TECL
$5.6B
| $109M | 0.06% |
2,939,400
+226,600
| +8% | +$21.1M |
|
156
CALL
Vistra
VST
$54.7B
| $109M | 0.06% |
788,800
-128,900
| -14% | -$17.9M |
|
|
UWC
157
PUT
DELISTED
PROSHARES TR ULTRA RUSSELL3000
UWC
| $107M | 0.06% |
1,330,800
+352,000
| +36% | +$28.2M |
|
158
CALL
Delta Air Lines
DAL
$55.6B
| $106M | 0.06% |
1,758,500
+200,600
| +13% | +$11.8M |
|
159
PUT
Spotify
SPOT
$101B
| $105M | 0.06% |
235,500
-146,000
| -38% | -$62.5M |
|
160
CALL
American Express
AXP
$240B
| $103M | 0.06% |
348,500
+45,600
| +15% | +$13.1M |
|
161
PUT
Dell
DELL
$261B
| $103M | 0.06% |
894,600
-109,600
| -11% | -$13.8M |
|
162
CALL
Airbnb
ABNB
$86B
| $103M | 0.06% |
781,400
-73,400
| -9% | -$9.89M |
|
163
CALL
ARK Space & Defense Innovation ETF
ARKX
$823M
| $103M | 0.06% |
2,070,700
+796,000
| +62% | +$14.4M |
|
164
PUT
American Airlines Group
AAL
$10.1B
| $101M | 0.06% |
5,808,500
+9,300
| +0.2% | +$134K |
|
165
PUT
IBM
IBM
$198B
| $99.9M | 0.06% |
601,900
+251,000
| +72% | +$55.9M |
|
166
PUT
Cisco
CSCO
$442B
| $98.9M | 0.06% |
1,670,000
+112,500
| +7% | +$6.43M |
|
167
CALL
Marvell Technology
MRVL
$187B
| $97.8M | 0.05% |
885,700
+43,000
| +5% | +$3.99M |
|
168
PUT
First Solar
FSLR
$22.1B
| $96.3M | 0.05% |
546,400
-8,900
| -2% | -$1.77M |
|
169
PUT
Reddit
RDDT
$35.8B
| $96M | 0.05% |
587,300
+398,600
| +211% | +$49.2M |
|
170
PUT
Mastercard
MA
$484B
| $95.6M | 0.05% |
181,600
-2,900
| -2% | -$1.5M |
|
|
NVO
171
CALL
Novo Nordisk
NVO
$218B
| $95.6M | 0.05% |
1,111,300
+603,400
| +119% | +$65.3M |
|
172
CALL
Xtrackers MSCI Emerging Markets Hedged Equity ETF
DBEM
$109M
| $95.2M | 0.05% |
3,595,600
+2,965,800
| +471% | +$76.7M |
|
173
CALL
Arista Networks
ANET
$220B
| $94.4M | 0.05% |
854,300
+92,700
| +12% | +$9.53M |
|
174
CALL
ServiceNow
NOW
$105B
| $94.3M | 0.05% |
445,000
-117,500
| -21% | -$23.8M |
|
175
CALL
SoFi Technologies
SOFI
$22.6B
| $93.6M | 0.05% |
6,079,300
+1,470,400
| +32% | +$19.1M |
|
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.