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 | |
|---|---|---|---|---|---|---|
1501
PUT
Logitech
LOGI
$15.2B
| $3.75M | ﹤0.01% |
44,400
-7,400
| -14% | -$696K |
|
|
ECHO
1502
CALL
EchoStar
ECHO
$25.2B
| $3.75M | ﹤0.01% |
146,500
-122,100
| -45% | -$3.32M |
|
1503
Chewy
CHWY
$8.59B
| $3.74M | ﹤0.01% |
115,156
-2,664
| -2% | -$95.6K |
|
1504
PUT
Lumentum
LITE
$59.2B
| $3.74M | ﹤0.01% |
60,000
-11,200
| -16% | -$862K |
|
1505
CALL
Generac Holdings
GNRC
$11.8B
| $3.74M | ﹤0.01% |
29,500
-53,300
| -64% | -$7.65M |
|
1506
CALL
Recursion Pharmaceuticals
RXRX
$1.58B
| $3.73M | ﹤0.01% |
706,100
+126,400
| +22% | +$921K |
|
1507
PUT
Sony
SONY
$124B
| $3.73M | ﹤0.01% |
147,000
-390,100
| -73% | -$9.01M |
|
1508
PUT
Axos Financial
AX
$5.46B
| $3.73M | ﹤0.01% |
57,800
-56,400
| -49% | -$3.83M |
|
|
SHNY
1509
PUT
DELISTED
Direxion Daily Silver Miners Index Bull 2X Shares
SHNY
| $3.73M | ﹤0.01% |
539,400
+8,200
| +2% | +$56.7K |
|
1510
PUT
Planet Fitness
PLNT
$4.25B
| $3.72M | ﹤0.01% |
38,500
-77,100
| -67% | -$7.76M |
|
1511
PUT
Burlington
BURL
$22.1B
| $3.72M | ﹤0.01% |
15,600
-18,100
| -54% | -$4.69M |
|
1512
CALL
Joby Aviation
JOBY
$6.88B
| $3.71M | ﹤0.01% |
616,900
-243,300
| -28% | -$1.82M |
|
1513
CALL
Rubrik
RBRK
$15B
| $3.71M | ﹤0.01% |
60,900
-19,600
| -24% | -$1.34M |
|
1514
PUT
SLM Corp
SLM
$4.55B
| $3.71M | ﹤0.01% |
126,200
+105,400
| +507% | +$3.08M |
|
1515
PUT
Scorpio Tankers
STNG
$3.94B
| $3.71M | ﹤0.01% |
98,600
-12,500
| -11% | -$560K |
|
1516
CALL
Enovix
ENVX
$855M
| $3.7M | ﹤0.01% |
576,457
-554,857
| -49% | -$4.94M |
|
1517
PUT
Exelixis
EXEL
$14B
| $3.7M | ﹤0.01% |
100,200
-46,800
| -32% | -$1.67M |
|
1518
CALL
Lattice Semiconductor
LSCC
$17.7B
| $3.7M | ﹤0.01% |
70,500
+48,500
| +220% | +$2.89M |
|
1519
ICICI Bank
IBN
$106B
| $3.68M | ﹤0.01% |
116,892
+58,822
| +101% | +$1.71M |
|
1520
PUT
Canadian Natural Resources
CNQ
$97.3B
| $3.68M | ﹤0.01% |
119,500
-120,300
| -50% | -$3.65M |
|
1521
PUT
GE HealthCare
GEHC
$27.8B
| $3.67M | ﹤0.01% |
45,500
-103,300
| -69% | -$8.88M |
|
1522
PUT
Cummins
CMI
$91.4B
| $3.67M | ﹤0.01% |
11,700
-10,600
| -48% | -$3.73M |
|
1523
CALL
Freshpet
FRPT
$2.84B
| $3.67M | ﹤0.01% |
44,100
+2,400
| +6% | +$294K |
|
1524
PUT
SentinelOne
S
$6.19B
| $3.66M | ﹤0.01% |
201,500
-116,600
| -37% | -$2.53M |
|
1525
PUT
Stride
LRN
$3.69B
| $3.65M | ﹤0.01% |
28,900
+19,400
| +204% | +$2.45M |
|
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.