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 | |
|---|---|---|---|---|---|---|
701
PUT
HSBC
HSBC
$354B
| $13.7M | 0.01% |
238,100
+74,000
| +45% | +$4.05M |
|
702
CALL
CoStar Group
CSGP
$11.3B
| $13.6M | 0.01% |
171,900
+92,100
| +115% | +$7.01M |
|
703
PUT
Rocket Lab Corp
RKLB
$43.6B
| $13.6M | 0.01% |
760,400
-15,200
| -2% | -$364K |
|
704
CALL
Regeneron Pharmaceuticals
REGN
$68.3B
| $13.6M | 0.01% |
21,400
-1,300
| -6% | -$894K |
|
705
CALL
GSK
GSK
$102B
| $13.6M | 0.01% |
349,800
-217,300
| -38% | -$7.96M |
|
706
CALL
Antero Resources
AR
$10.9B
| $13.5M | 0.01% |
334,800
-142,300
| -30% | -$5.46M |
|
707
PUT
Suncor Energy
SU
$76.4B
| $13.5M | 0.01% |
348,600
+18,300
| +6% | +$698K |
|
708
PUT
Alnylam Pharmaceuticals
ALNY
$35.6B
| $13.5M | 0.01% |
49,900
+21,000
| +73% | +$5.4M |
|
709
CALL
Cleveland-Cliffs
CLF
$5.39B
| $13.4M | 0.01% |
1,635,600
-468,100
| -22% | -$4.76M |
|
710
PUT
Analog Devices
ADI
$188B
| $13.4M | 0.01% |
66,300
-43,800
| -40% | -$9.47M |
|
711
PUT
Entergy
ETR
$53.6B
| $13.3M | 0.01% |
156,000
+154,200
| +8,567% | +$12.7M |
|
712
PUT
LyondellBasell Industries
LYB
$20.1B
| $13.3M | 0.01% |
189,100
-31,600
| -14% | -$2.38M |
|
713
PUT
Avis
CAR
$5.81B
| $13.3M | 0.01% |
175,000
+74,300
| +74% | +$5.97M |
|
714
CALL
Ciena
CIEN
$56.2B
| $13.2M | 0.01% |
219,100
+47,200
| +27% | +$3.73M |
|
715
PUT
Chewy
CHWY
$8.81B
| $13.2M | 0.01% |
407,200
-154,600
| -28% | -$5.55M |
|
716
PUT
CleanSpark
CLSK
$3.93B
| $13.2M | 0.01% |
1,961,600
-217,700
| -10% | -$2.06M |
|
717
CALL
Marriott International
MAR
$97.5B
| $13.2M | 0.01% |
55,300
-132,300
| -71% | -$36M |
|
|
718
PUT
Marriott International
MAR
$97.5B
| $13.2M | 0.01% |
55,300
-102,300
| -65% | -$27.8M |
|
719
CALL
Enphase Energy
ENPH
$5.22B
| $13.1M | 0.01% |
211,900
-175,000
| -45% | -$11.1M |
|
720
CALL
Aptiv
APTV
$12.3B
| $13.1M | 0.01% |
220,900
+52,400
| +31% | +$3.32M |
|
721
PUT
Diamondback Energy
FANG
$57.1B
| $13.1M | 0.01% |
81,900
+11,400
| +16% | +$1.84M |
|
722
CALL
Burlington
BURL
$22.3B
| $13.1M | 0.01% |
54,900
+33,900
| +161% | +$8.78M |
|
|
SCIU
723
PUT
DELISTED
Global X Scientific Beta US ETF
SCIU
| $13.1M | 0.01% |
481,800
+57,800
| +14% | +$1.57M |
|
|
SLNO
724
CALL
DELISTED
Soleno Therapeutics
SLNO
| $13M | 0.01% |
182,300
+120,100
| +193% | +$5.85M |
|
725
Booking.com
BKNG
$138B
| $13M | 0.01% |
70,675
-19,300
| -21% | -$3.69M |
|
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.