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 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$272M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$99M |
| 3 |
NVIDIA
NVDA
|
+$89.9M |
| 4 |
TSMC
TSM
|
+$87.7M |
| 5 |
Amazon
AMZN
|
+$61M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$518M |
| 2 |
Strategy Inc
MSTR
|
+$81.2M |
| 3 |
Alibaba
BABA
|
+$66.7M |
| 4 |
Advanced Micro Devices
AMD
|
+$44.3M |
| 5 |
Uber
UBER
|
+$41.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.41% |
| 2 | Consumer Discretionary | 0.22% |
| 3 | Healthcare | 0.17% |
| 4 | Communication Services | 0.15% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
201
PUT
Baidu
BIDU
$36.7B
| $67M | 0.04% |
728,300
+239,700
| +49% | +$21.5M |
|
202
CALL
Blackstone
BX
$150B
| $66.8M | 0.04% |
478,200
-11,600
| -2% | -$1.88M |
|
|
NVO
203
PUT
Novo Nordisk
NVO
$213B
| $66.4M | 0.04% |
956,400
+31,000
| +3% | +$2.56M |
|
204
CALL
Applied Materials
AMAT
$444B
| $66.4M | 0.04% |
457,400
+43,700
| +11% | +$7.35M |
|
205
CALL
Philip Morris
PM
$304B
| $66.2M | 0.04% |
417,100
-82,900
| -17% | -$11.7M |
|
206
PUT
Spotify
SPOT
$98.3B
| $65.5M | 0.04% |
119,100
-116,400
| -49% | -$65.1M |
|
207
PUT
Snowflake
SNOW
$93.2B
| $65.3M | 0.04% |
446,900
-201,200
| -31% | -$34.1M |
|
|
XYZ
208
CALL
Block Inc
XYZ
$46.2B
| $65.3M | 0.04% |
1,201,700
-289,400
| -19% | -$21.6M |
|
209
PUT
Cisco
CSCO
$445B
| $65.3M | 0.04% |
1,244,000
-426,000
| -26% | -$26.2M |
|
210
CALL
GE Vernova
GEV
$267B
| $64.8M | 0.04% |
212,300
+99,300
| +88% | +$34.6M |
|
211
CALL
Mastercard
MA
$472B
| $64.3M | 0.04% |
117,300
-26,500
| -18% | -$14.4M |
|
212
PUT
Chipotle Mexican Grill
CMG
$42.6B
| $63.8M | 0.04% |
1,271,400
-1,741,100
| -58% | -$94.7M |
|
213
PUT
lululemon athletica
LULU
$12.9B
| $63.7M | 0.04% |
224,900
+40,000
| +22% | +$14.7M |
|
214
CALL
Eaton
ETN
$159B
| $63.6M | 0.04% |
233,900
+110,600
| +90% | +$34.4M |
|
215
CALL
United Airlines
UAL
$38.1B
| $63.4M | 0.04% |
917,500
-693,800
| -43% | -$65.5M |
|
216
CALL
GameStop
GME
$9.75B
| $62.8M | 0.04% |
2,814,900
+1,012,600
| +56% | +$26.5M |
|
217
CALL
Vertiv
VRT
$116B
| $62.7M | 0.04% |
869,100
+54,400
| +7% | +$5.79M |
|
218
CALL
Danaher
DHR
$125B
| $62.7M | 0.04% |
306,100
+66,600
| +28% | +$14.5M |
|
219
CALL
Lam Research
LRCX
$401B
| $62.6M | 0.04% |
861,700
-44,100
| -5% | -$3.47M |
|
220
PUT
SoFi Technologies
SOFI
$22B
| $62.5M | 0.04% |
5,375,000
+411,300
| +8% | +$5.93M |
|
221
CALL
DraftKings
DKNG
$11.3B
| $61.8M | 0.04% |
1,859,700
+274,400
| +17% | +$11.3M |
|
222
PUT
Gilead Sciences
GILD
$164B
| $61.7M | 0.04% |
550,400
+109,600
| +25% | +$11.3M |
|
223
CALL
Marvell Technology
MRVL
$192B
| $61.5M | 0.04% |
998,100
+112,400
| +13% | +$10.9M |
|
224
CALL
Comcast
CMCSA
$84.9B
| $61.4M | 0.04% |
1,664,700
+700,200
| +73% | +$25.3M |
|
225
CALL
Sea Limited
SE
$64.9B
| $61.1M | 0.04% |
467,900
-198,800
| -30% | -$24.7M |
|
Similar funds
Simplex Trading's Q1 2025 Portfolio in Review
As of Q1 2025, Simplex Trading held 10,070 positions worth $156B, down 13% from $179B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading withdrew a net $7.93B in Q1 2025, closing 1,547 positions and reducing 3,654 holdings. Its most notable exit was Alibaba, an estimated $66.7M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.68% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in iShares 20+ Year Treasury Bond ETF worth $278M.
- Simplex Trading's largest Q1 2025 buy was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M.
- Simplex Trading added most to NVIDIA in Q1 2025, an estimated $89.9M increase.
- Simplex Trading's biggest Q1 2025 reduction was Apple, cutting an estimated $518M.
- Simplex Trading fully exited Alibaba in Q1 2025, selling an estimated $66.7M.
- Simplex Trading's ten largest holdings make up 51% of its $156B portfolio in Q1 2025.
- Simplex Trading opened 1,566 new positions and closed 1,547 in Q1 2025.
- Simplex Trading's portfolio value fell 13% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q1 2025, filed 12 May 2025.