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 |
Amazon
AMZN
|
+$168M |
| 2 |
NVIDIA
NVDA
|
+$141M |
| 3 |
TSMC
TSM
|
+$121M |
| 4 |
Meta Platforms (Facebook)
META
|
+$107M |
| 5 |
SPDR Gold Trust
GLD
|
+$103M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$174M |
| 2 |
Western Digital
WDC
|
+$87.7M |
| 3 |
Broadcom
AVGO
|
+$62.2M |
| 4 |
Direxion Daily Semiconductor Bull 3X ETF
SOXL
|
+$52M |
| 5 |
Netflix
NFLX
|
+$44.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.3% |
| 2 | Technology | 0.62% |
| 3 | Communication Services | 0.22% |
| 4 | Consumer Discretionary | 0.21% |
| 5 | Healthcare | 0.2% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
5701
CALL
CGI
GIB
$14.5B
| $58.5K | ﹤0.01% |
800
-100
| -11% | -$7.99K |
2025 Q3
2 quarters
|
|
5702
Global X Blockchain ETF
BKCH
$287M
| $58.5K | ﹤0.01% |
1,047
-1,623
| -61% | -$109K |
2025 Q3
2 quarters
|
|
5703
CALL
Acumen Pharmaceuticals
ABOS
$148M
| $58.3K | ﹤0.01% |
24,700
+18,100
| +274% | +$46.2K |
2023 Q3
10 quarters
|
|
5704
PUT
SFL Corp
SFL
$1.87B
| $58.3K | ﹤0.01% |
5,400
-13,400
| -71% | -$130K |
2021 Q2
19 quarters
|
|
5705
CALL
F&G Annuities & Life
FG
$2.87B
| $58.2K | ﹤0.01% |
+2,300
| New | +$59.9K |
2026 Q1
0 quarters
|
|
5706
Group 1 Automotive
GPI
$2.98B
| $58.2K | ﹤0.01% |
176
+174
| +8,700% | +$60.7K |
2025 Q4
1 quarter
|
|
5707
Willis Towers Watson
WTW
$26.8B
| $58.1K | ﹤0.01% |
+200
| New | +$61.4K |
2026 Q1
0 quarters
|
|
5708
USA Compression Partners
USAC
$3.69B
| $58.1K | ﹤0.01% |
+2,143
| New | +$56.9K |
2026 Q1
0 quarters
|
|
|
PENG
5709
PUT
Penguin Solutions Inc
PENG
$3.15B
| $58.1K | ﹤0.01% |
3,300
-39,400
| -92% | -$750K |
2018 Q2
31 quarters
|
|
5710
CALL
Watts Water Technologies
WTS
$12.1B
| $58.1K | ﹤0.01% |
+200
| New | +$61K |
2026 Q1
0 quarters
|
|
5711
PUT
Freedom Holding
FRHC
$11.1B
| $58K | ﹤0.01% |
400
-2,700
| -87% | -$346K |
2022 Q4
13 quarters
|
|
5712
CALL
The Greenbrier Companies
GBX
$1.26B
| $57.9K | ﹤0.01% |
1,100
+700
| +175% | +$37K |
2014 Q4
45 quarters
|
|
5713
CALL
Ethan Allen Interiors
ETD
$531M
| $57.9K | ﹤0.01% |
2,600
+300
| +13% | +$6.97K |
2021 Q4
17 quarters
|
|
|
HUCK
5714
Huckleberry.ai, Inc. Class B Common Stock
HUCK
$151M
| $57.8K | ﹤0.01% |
+18,903
| New | +$95.8K |
2026 Q1
0 quarters
|
|
5715
CALL
Byrna Technologies
BYRN
$81.4M
| $57.8K | ﹤0.01% |
6,300
-1,300
| -17% | -$17.1K |
2022 Q2
15 quarters
|
|
5716
PUT
loanDepot
LDI
$213M
| $57.8K | ﹤0.01% |
40,700
-2,000
| -5% | -$4.11K |
2025 Q3
2 quarters
|
|
5717
Edgewise Therapeutics
EWTX
$4.5B
| $57.7K | ﹤0.01% |
1,832
-7,237
| -80% | -$209K |
2025 Q2
3 quarters
|
|
|
SEPN
5718
CALL
Septerna Inc
SEPN
$1.76B
| $57.7K | ﹤0.01% |
2,400
+1,100
| +85% | +$28.9K |
2025 Q1
4 quarters
|
|
5719
MoonLake Immunotherapeutics
MLTX
$971M
| $57.3K | ﹤0.01% |
3,075
-25,897
| -89% | -$429K |
2025 Q3
2 quarters
|
|
5720
Dole
DOLE
$1.2B
| $57.3K | ﹤0.01% |
4,010
+3,818
| +1,989% | +$57.9K |
2024 Q4
5 quarters
|
|
|
GTY
5721
CALL
Getty Realty Corp
GTY
$1.75B
| $57.2K | ﹤0.01% |
1,800
+1,500
| +500% | +$46.9K |
2020 Q2
23 quarters
|
|
5722
CALL
Cooper Companies
COO
$10.8B
| $57.2K | ﹤0.01% |
800
-2,900
| -78% | -$229K |
2022 Q4
13 quarters
|
|
5723
PUT
Quantum-Si Incorporated
QSI
$339M
| $57.2K | ﹤0.01% |
73,900
-117,700
| -61% | -$122K |
2024 Q4
5 quarters
|
|
|
LIF
5724
CALL
Life360
LIF
$3.51B
| $57.1K | ﹤0.01% |
1,400
-900
| -39% | -$46.6K |
2025 Q2
3 quarters
|
|
5725
Comstock Resources
CRK
$3.75B
| $57.1K | ﹤0.01% |
2,711
-97,448
| -97% | -$2.07M |
2025 Q3
2 quarters
|
|
Similar funds
Simplex Trading's Q1 2026 Portfolio in Review
As of Q1 2026, Simplex Trading held 10,500 positions worth $149B, down 16% from $177B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q1 2026 filing shows 2,157 new, 2,651 increased, 3,926 reduced and 1,574 closed positions. Its largest new stake was Amazon: 764,884 shares worth $159M. The largest sale was Apple, an estimated $174M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, up from 98% a quarter earlier, followed by Technology and Communication Services.
- Simplex Trading's largest Q1 2026 buy was Amazon: 764,884 shares worth $159M.
- Simplex Trading added most to NVIDIA in Q1 2026, an estimated $141M increase.
- Simplex Trading's biggest Q1 2026 reduction was Apple, cutting an estimated $174M.
- Simplex Trading fully exited Direxion Daily Semiconductor Bull 3X ETF in Q1 2026, selling an estimated $52M.
- Simplex Trading's ten largest holdings make up 51% of its $149B portfolio in Q1 2026.
- Simplex Trading opened 2,157 new positions and closed 1,574 in Q1 2026.
- Simplex Trading's portfolio value fell 16% quarter-over-quarter to $149B.
Based on Simplex Trading's 13F filing for Q1 2026, filed 14 May 2026.