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 | |
|---|---|---|---|---|---|---|
501
CALL
DuPont de Nemours
DD
$18.9B
| $21.6M | 0.01% |
230,635
-126,112
| -35% | -$12.3M |
|
502
CALL
Amphenol
APH
$194B
| $21.5M | 0.01% |
327,800
+56,800
| +21% | +$3.88M |
|
503
CALL
Dollar General
DG
$26.5B
| $21.4M | 0.01% |
243,400
-150,600
| -38% | -$11.4M |
|
504
CALL
Coupang
CPNG
$28.1B
| $21.1M | 0.01% |
961,900
-476,000
| -33% | -$11.1M |
|
505
PUT
Dow Inc
DOW
$22.5B
| $21M | 0.01% |
601,700
-64,700
| -10% | -$2.48M |
|
506
PUT
ResMed
RMD
$28B
| $20.9M | 0.01% |
93,500
-3,600
| -4% | -$840K |
|
507
PUT
Abercrombie & Fitch
ANF
$4.27B
| $20.9M | 0.01% |
273,300
+32,100
| +13% | +$3.46M |
|
508
PUT
Twilio
TWLO
$27.8B
| $20.9M | 0.01% |
213,000
-49,200
| -19% | -$5.83M |
|
509
CALL
iPath Series B S&P 500 VIX Short-Term Futures ETN
VXX
$156M
| $20.8M | 0.01% |
404,800
+166,600
| +70% | +$7.71M |
|
510
CALL
US Bancorp Series B Preferred Stock
USB.PRH
$747M
| $20.8M | 0.01% |
493,000
+167,500
| +51% | +$3.79M |
|
511
PUT
Cardinal Health
CAH
$51.7B
| $20.8M | 0.01% |
150,900
+68,300
| +83% | +$8.71M |
|
512
CALL
Bilibili
BILI
$7.4B
| $20.8M | 0.01% |
1,086,200
-108,400
| -9% | -$2.08M |
|
513
CALL
Coherent
COHR
$61.1B
| $20.7M | 0.01% |
318,400
+94,800
| +42% | +$7.85M |
|
514
PUT
Agnico Eagle Mines
AEM
$73.5B
| $20.6M | 0.01% |
189,600
-36,900
| -16% | -$3.53M |
|
515
PUT
Ferrari
RACE
$65.4B
| $20.4M | 0.01% |
47,600
+7,300
| +18% | +$3.28M |
|
516
CALL
ProShares Ultra Bloomberg Natural Gas
BOIL
$422M
| $20.3M | 0.01% |
318,600
-313,100
| -50% | -$47M |
|
517
CALL
Edwards Lifesciences
EW
$48.6B
| $20.2M | 0.01% |
279,300
-56,200
| -17% | -$4.02M |
|
518
CALL
Oneok
OKE
$57.8B
| $20.2M | 0.01% |
204,000
+35,100
| +21% | +$3.48M |
|
519
ProShares Short QQQ
PSQ
$673M
| $20.1M | 0.01% |
495,320
+39,852
| +9% | +$1.51M |
|
520
CALL
SiriusXM
SIRI
$10B
| $20.1M | 0.01% |
891,800
-29,600
| -3% | -$697K |
|
521
PUT
Corcept Therapeutics
CORT
$9.76B
| $20.1M | 0.01% |
175,700
+146,700
| +506% | +$8.93M |
|
|
BNY
522
CALL
Bank of New York Mellon
BNY
$110B
| $20M | 0.01% |
239,000
-127,800
| -35% | -$10.7M |
|
523
CALL
Northrop Grumman
NOC
$74.6B
| $20M | 0.01% |
39,100
-36,300
| -48% | -$17.3M |
|
524
PUT
eBay
EBAY
$49.3B
| $20M | 0.01% |
295,500
-75,300
| -20% | -$5.02M |
|
|
525
PUT
ProShares Ultra Bloomberg Natural Gas
BOIL
$422M
| $20M | 0.01% |
318,850
-255,600
| -44% | -$38.4M |
|
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.