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 | |
|---|---|---|---|---|---|---|
326
CALL
Lennar Class A
LEN
$19.8B
| $39.6M | 0.03% |
460,300
+36,150
| +9% | +$4.51M |
|
327
CALL
Duke Energy
DUK
$99.7B
| $39.5M | 0.03% |
323,500
+151,100
| +88% | +$17.2M |
|
328
PUT
FedEx
FDX
$76.6B
| $39.3M | 0.03% |
161,400
-106,300
| -40% | -$27.6M |
|
329
PUT
Lockheed Martin
LMT
$119B
| $39.1M | 0.03% |
87,500
-7,200
| -8% | -$3.31M |
|
330
PUT
Caterpillar
CAT
$410B
| $37.8M | 0.02% |
114,600
-47,600
| -29% | -$17M |
|
331
CALL
Microchip Technology
MCHP
$46.2B
| $37.6M | 0.02% |
776,700
+409,200
| +111% | +$22.8M |
|
332
CALL
Marathon Digital Holdings
MARA
$4.73B
| $37.5M | 0.02% |
3,262,800
-703,800
| -18% | -$11.2M |
|
333
CALL
Cloudflare
NET
$95.5B
| $37.4M | 0.02% |
332,300
+8,000
| +2% | +$1.06M |
|
334
CALL
Crown Castle
CCI
$33.8B
| $37.3M | 0.02% |
357,600
+253,700
| +244% | +$23.7M |
|
335
PUT
Cigna
CI
$75.4B
| $37.2M | 0.02% |
113,100
+1,800
| +2% | +$542K |
|
336
PUT
Honeywell
HON
$73.8B
| $37.2M | 0.02% |
186,312
-25,358
| -12% | -$5.13M |
|
|
WBA
337
CALL
DELISTED
Walgreens Boots Alliance
WBA
| $37M | 0.02% |
3,314,900
+1,485,600
| +81% | +$16.1M |
|
338
Citigroup
C
$222B
| $36.8M | 0.02% |
519,037
-168,447
| -25% | -$12.8M |
|
339
CALL
Corning
GLW
$133B
| $36.8M | 0.02% |
804,800
-4,600
| -0.6% | -$227K |
|
340
CALL
Constellation Energy
CEG
$98.2B
| $36.8M | 0.02% |
182,300
+11,300
| +7% | +$3.03M |
|
341
CALL
Halliburton
HAL
$27.6B
| $36.7M | 0.02% |
1,475,000
-31,800
| -2% | -$836K |
|
342
PUT
American Express
AXP
$238B
| $36.5M | 0.02% |
135,500
-111,000
| -45% | -$32.8M |
|
343
CALL
Twilio
TWLO
$27.8B
| $36.4M | 0.02% |
371,800
+78,000
| +27% | +$9.24M |
|
344
PUT
Reddit
RDDT
$32.8B
| $36.4M | 0.02% |
382,600
-204,700
| -35% | -$33.8M |
|
345
CALL
Riot Platforms
RIOT
$8.84B
| $36.4M | 0.02% |
5,111,400
+978,000
| +24% | +$10.1M |
|
346
CALL
Kinder Morgan
KMI
$72.3B
| $36.1M | 0.02% |
1,265,100
+14,200
| +1% | +$393K |
|
347
PUT
Albemarle
ALB
$13.9B
| $36M | 0.02% |
500,100
-11,500
| -2% | -$936K |
|
348
PUT
Trade Desk
TTD
$8.26B
| $35.9M | 0.02% |
655,300
+388,000
| +145% | +$35.1M |
|
349
PUT
AST SpaceMobile
ASTS
$18.5B
| $35.8M | 0.02% |
1,572,900
+480,200
| +44% | +$12.3M |
|
350
CALL
GraniteShares Bloomberg Commodity Broad Strategy No K-1 ETF
COMB
$135M
| $35.6M | 0.02% |
996,800
+3,700
| +0.4% | +$78.1K |
|
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.