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 | |
|---|---|---|---|---|---|---|
601
PUT
Cadence Design Systems
CDNS
$93B
| $16.7M | 0.01% |
65,700
+29,900
| +84% | +$8.31M |
|
602
CALL
HP
HPQ
$23B
| $16.7M | 0.01% |
603,000
-300,300
| -33% | -$9.5M |
|
603
CALL
ON Semiconductor
ON
$35.9B
| $16.7M | 0.01% |
410,200
+112,200
| +38% | +$5.65M |
|
604
PUT
CF Industries
CF
$19.6B
| $16.7M | 0.01% |
213,200
-94,600
| -31% | -$7.94M |
|
605
PUT
Ciena
CIEN
$56.2B
| $16.7M | 0.01% |
275,700
+118,700
| +76% | +$9.38M |
|
606
CALL
Suncor Energy
SU
$76.4B
| $16.6M | 0.01% |
429,900
+77,100
| +22% | +$2.94M |
|
607
PUT
Iris Energy
IREN
$14.8B
| $16.6M | 0.01% |
2,731,600
+568,000
| +26% | +$5.53M |
|
608
PUT
Interactive Brokers
IBKR
$41.7B
| $16.6M | 0.01% |
401,600
-12,800
| -3% | -$634K |
|
|
NVO
609
Novo Nordisk
NVO
$213B
| $16.6M | 0.01% |
+239,010
| New | +$19.7M |
|
610
CALL
Restaurant Brands International
QSR
$25.4B
| $16.6M | 0.01% |
248,700
+20,400
| +9% | +$1.32M |
|
611
CALL
Toast
TOST
$16.9B
| $16.5M | 0.01% |
498,400
-142,200
| -22% | -$5.32M |
|
612
PUT
SharkNinja
SN
$20.8B
| $16.5M | 0.01% |
198,100
+131,100
| +196% | +$13.3M |
|
613
CALL
Automatic Data Processing
ADP
$97.2B
| $16.5M | 0.01% |
54,000
-9,700
| -15% | -$2.93M |
|
614
CALL
Cigna
CI
$75.4B
| $16.5M | 0.01% |
50,100
-66,000
| -57% | -$19.9M |
|
615
CALL
American International
AIG
$41.5B
| $16.4M | 0.01% |
188,800
-252,700
| -57% | -$19.6M |
|
616
CALL
Schwab US Broad Market ETF
SCHB
$43.3B
| $16.4M | 0.01% |
594,800
+198,200
| +50% | +$4.51M |
|
617
PUT
Regeneron Pharmaceuticals
REGN
$68.3B
| $16.4M | 0.01% |
25,800
+1,300
| +5% | +$894K |
|
618
Humana
HUM
$47.7B
| $16.3M | 0.01% |
61,672
-37,223
| -38% | -$10.1M |
|
619
Wells Fargo
WFC
$262B
| $16.3M | 0.01% |
227,152
-55,316
| -20% | -$4.15M |
|
|
AXON
620
PUT
Axon Enterprise
AXON
$39.6B
| $16.3M | 0.01% |
31,000
-9,000
| -23% | -$5.27M |
|
621
CALL
Valero Energy
VLO
$92.3B
| $16.2M | 0.01% |
123,000
-119,000
| -49% | -$15.8M |
|
622
PUT
Nu Holdings
NU
$70.1B
| $16.2M | 0.01% |
1,586,100
-16,400
| -1% | -$194K |
|
623
PUT
United Rentals
URI
$64.8B
| $16.2M | 0.01% |
25,900
-4,300
| -14% | -$2.96M |
|
|
624
PUT
ON Semiconductor
ON
$35.9B
| $16.2M | 0.01% |
398,700
-26,500
| -6% | -$1.33M |
|
625
CALL
Capri Holdings
CPRI
$1.86B
| $16.2M | 0.01% |
821,900
-185,100
| -18% | -$4.1M |
|
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.