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 |
Pfizer
PFE
|
+$89.5M |
| 2 |
State Street Energy Select Sector SPDR ETF
XLE
|
+$85.5M |
| 3 |
Boeing
BA
|
+$71M |
| 4 |
Intel
INTC
|
+$60.7M |
| 5 |
Meta Platforms (Facebook)
META
|
+$48.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$117M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$104M |
| 3 |
Alibaba
BABA
|
+$82.8M |
| 4 |
Walt Disney
DIS
|
+$68.5M |
| 5 |
Citigroup
C
|
+$59.8M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.38% |
| 2 | Healthcare | 0.27% |
| 3 | Consumer Discretionary | 0.25% |
| 4 | Industrials | 0.17% |
| 5 | Communication Services | 0.16% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
301
PUT
DexCom
DXCM
$27.6B
| $58.4M | 0.03% |
421,000
-215,900
| -34% | -$27.1M |
|
302
CALL
Intuitive Surgical
ISRG
$121B
| $58.3M | 0.03% |
146,200
+27,200
| +23% | +$10.3M |
|
303
PUT
Williams-Sonoma
WSM
$26.2B
| $58.2M | 0.03% |
366,600
+52,400
| +17% | +$6.08M |
|
304
CALL
Datadog
DDOG
$87.5B
| $58M | 0.03% |
469,100
-132,100
| -22% | -$16.6M |
|
305
TSMC
TSM
$2.18T
| $57.7M | 0.03% |
424,287
+227,661
| +116% | +$28.3M |
|
306
PUT
Lockheed Martin
LMT
$119B
| $57.7M | 0.03% |
126,900
-129,400
| -50% | -$56.7M |
|
307
CALL
Dick's Sporting Goods
DKS
$18.8B
| $57.6M | 0.03% |
256,200
-43,300
| -14% | -$7.4M |
|
308
PUT
Cigna
CI
$75.4B
| $57.3M | 0.03% |
157,800
+21,000
| +15% | +$6.91M |
|
309
CALL
Marathon Petroleum
MPC
$92.2B
| $57.2M | 0.03% |
283,800
-18,600
| -6% | -$3.18M |
|
310
CALL
Western Digital
WDC
$192B
| $56.6M | 0.03% |
1,097,561
+351,918
| +47% | +$15.4M |
|
311
CALL
Snap
SNAP
$7.52B
| $56.2M | 0.03% |
4,898,300
+1,382,400
| +39% | +$18.5M |
|
312
CALL
Analog Devices
ADI
$188B
| $56.1M | 0.03% |
283,600
+33,700
| +13% | +$6.48M |
|
313
CALL
AT&T
T
$160B
| $56.1M | 0.03% |
3,185,300
-1,996,600
| -39% | -$34.1M |
|
314
CALL
Sea Limited
SE
$64.2B
| $56M | 0.03% |
1,042,300
-897,200
| -46% | -$41.3M |
|
315
PUT
Eaton
ETN
$158B
| $55.6M | 0.03% |
214,200
+139,000
| +185% | +$38M |
|
316
PUT
Diamondback Energy
FANG
$57.1B
| $55.4M | 0.03% |
279,800
+46,500
| +20% | +$7.9M |
|
317
CALL
Carnival Corporation Ltd
CCL
$35.7B
| $55.3M | 0.03% |
3,385,800
-1,430,400
| -30% | -$23.3M |
|
318
CALL
Carvana
CVNA
$44.9B
| $55M | 0.03% |
3,129,500
-7,358,500
| -70% | -$89.8M |
|
319
CALL
Progressive
PGR
$119B
| $55M | 0.03% |
265,700
-25,700
| -9% | -$4.77M |
|
320
CALL
Dollar General
DG
$26.5B
| $54.6M | 0.03% |
349,600
-137,900
| -28% | -$19.6M |
|
321
KraneShares CSI China Internet ETF
KWEB
$5.23B
| $54.4M | 0.03% |
2,073,125
+191,650
| +10% | +$4.83M |
|
322
CALL
Starbucks
SBUX
$119B
| $54.4M | 0.03% |
594,800
-397,500
| -40% | -$37M |
|
323
PUT
Robinhood
HOOD
$93.8B
| $54.2M | 0.03% |
2,693,100
+216,400
| +9% | +$3.03M |
|
324
CALL
Intuit
INTU
$77.8B
| $54.2M | 0.03% |
83,400
-14,200
| -15% | -$9.06M |
|
|
325
PUT
Dollar General
DG
$26.5B
| $54.2M | 0.03% |
347,200
-125,400
| -27% | -$17.8M |
|
Similar funds
Simplex Trading's Q1 2024 Portfolio in Review
As of Q1 2024, Simplex Trading held 10,366 positions worth $173B, up 11% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading's Q1 2024 filing shows 1,549 new, 3,675 increased, 3,484 reduced and 1,506 closed positions. Its largest new stake was Boeing: 345,653 shares worth $66.7M. The largest sale was NVIDIA, an estimated $117M.
By sector, the portfolio is most concentrated in Technology at 0.38% of assets, up from 0.33% a quarter earlier, followed by Healthcare and Consumer Discretionary.
- Simplex Trading's largest Q1 2024 buy was Boeing: 345,653 shares worth $66.7M.
- Simplex Trading added most to Pfizer in Q1 2024, an estimated $89.5M increase.
- Simplex Trading's biggest Q1 2024 reduction was NVIDIA, cutting an estimated $117M.
- Simplex Trading fully exited Citigroup in Q1 2024, selling an estimated $59.8M.
- Simplex Trading's ten largest holdings make up 47% of its $173B portfolio in Q1 2024.
- Simplex Trading opened 1,549 new positions and closed 1,506 in Q1 2024.
- Simplex Trading's portfolio value rose 11% quarter-over-quarter to $173B.
Based on Simplex Trading's 13F filing for Q1 2024, filed 25 Apr 2024.