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 | |
|---|---|---|---|---|---|---|
376
CALL
Globalstar
GSAT
$10.3B
| $32.4M | 0.02% |
1,554,000
+1,508,127
| +3,288% | +$36.5M |
|
377
PUT
Occidental Petroleum
OXY
$57.2B
| $32.3M | 0.02% |
653,500
-701,100
| -52% | -$34.2M |
|
378
CALL
General Dynamics
GD
$101B
| $32.2M | 0.02% |
118,300
-18,600
| -14% | -$4.83M |
|
379
PUT
Moderna
MRNA
$23B
| $32M | 0.02% |
1,130,400
+69,200
| +7% | +$2.46M |
|
380
CALL
Hewlett Packard
HPE
$63.7B
| $31.8M | 0.02% |
2,058,200
+1,000,000
| +95% | +$19.9M |
|
381
CALL
TJX Companies
TJX
$172B
| $31.7M | 0.02% |
260,200
-89,600
| -26% | -$10.9M |
|
382
PUT
Dollar Tree
DLTR
$23.5B
| $31.6M | 0.02% |
420,700
-166,700
| -28% | -$11.9M |
|
383
CALL
Williams Companies
WMB
$91.1B
| $31.5M | 0.02% |
527,500
+69,400
| +15% | +$3.97M |
|
384
PUT
Hims & Hers Health
HIMS
$7.33B
| $31.5M | 0.02% |
1,066,100
-202,000
| -16% | -$7.5M |
|
385
CALL
Enterprise Products Partners
EPD
$84.1B
| $31.4M | 0.02% |
921,000
-114,600
| -11% | -$3.82M |
|
386
CALL
Roblox
RBLX
$35.5B
| $31.4M | 0.02% |
539,200
-668,200
| -55% | -$42M |
|
387
PUT
DoorDash
DASH
$77.4B
| $31.3M | 0.02% |
171,200
-129,500
| -43% | -$24.4M |
|
388
CALL
Mercado Libre
MELI
$91.2B
| $31M | 0.02% |
15,900
-4,000
| -20% | -$7.94M |
|
389
CALL
Vertex Pharmaceuticals
VRTX
$120B
| $31M | 0.02% |
63,900
-24,000
| -27% | -$11.2M |
|
390
PUT
Estee Lauder
EL
$29.9B
| $30.9M | 0.02% |
468,000
-16,000
| -3% | -$1.16M |
|
391
PUT
Delta Air Lines
DAL
$54.9B
| $30.6M | 0.02% |
702,900
-641,400
| -48% | -$38M |
|
392
PUT
Charter Communications
CHTR
$15.9B
| $30.4M | 0.02% |
82,500
-56,300
| -41% | -$20.1M |
|
393
Tesla
TSLA
$1.4T
| $30.4M | 0.02% |
117,279
+107,115
| +1,054% | +$35.7M |
|
394
CALL
Ulta Beauty
ULTA
$20.8B
| $30.3M | 0.02% |
82,600
-23,600
| -22% | -$8.99M |
|
395
Baidu
BIDU
$36.6B
| $30.3M | 0.02% |
328,925
+65,746
| +25% | +$5.9M |
|
396
CALL
Devon Energy
DVN
$51.8B
| $30.2M | 0.02% |
808,400
-105,400
| -12% | -$3.74M |
|
397
CALL
Becton Dickinson
BDX
$42.2B
| $30M | 0.02% |
130,900
+31,300
| +31% | +$7.26M |
|
398
PUT
Nucor
NUE
$53.7B
| $29.9M | 0.02% |
248,800
+57,500
| +30% | +$7.41M |
|
399
PUT
American International
AIG
$41.5B
| $29.8M | 0.02% |
343,300
-66,400
| -16% | -$5.16M |
|
|
B
400
PUT
Barrick Mining
B
$62.8B
| $29.7M | 0.02% |
1,530,100
-882,200
| -37% | -$15.5M |
|
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.