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 | |
|---|---|---|---|---|---|---|---|
|
DOO
4351
Bombardier Recreational Products
DOO
$3.89B
| $191K | ﹤0.01% |
2,662
+2,292
| +619% | +$168K |
2025 Q3
2 quarters
|
|
4352
CALL
Enlight Renewable Energy
ENLT
$9.14B
| $191K | ﹤0.01% |
+2,800
| New | +$179K |
2026 Q1
0 quarters
|
|
4353
CALL
Ichor Holdings
ICHR
$2.34B
| $191K | ﹤0.01% |
4,100
-2,600
| -39% | -$101K |
2025 Q1
4 quarters
|
|
4354
PUT
DXC Technology
DXC
$1.86B
| $191K | ﹤0.01% |
15,200
-5,800
| -28% | -$77.9K |
2017 Q4
33 quarters
|
|
4355
PUT
Cemex
CX
$13.6B
| $191K | ﹤0.01% |
16,700
-7,400
| -31% | -$88.2K |
2021 Q1
20 quarters
|
|
4356
Worthington Enterprises
WOR
$2.89B
| $191K | ﹤0.01% |
3,661
+3,243
| +776% | +$174K |
2024 Q4
5 quarters
|
|
4357
CALL
SES AI
SES
$303M
| $191K | ﹤0.01% |
198,300
-205,000
| -51% | -$348K |
2024 Q4
5 quarters
|
|
4358
PUT
ARKO Corp
ARKO
$461M
| $191K | ﹤0.01% |
34,300
+17,600
| +105% | +$98.1K |
2025 Q1
4 quarters
|
|
4359
Lufax Holding
LU
$1.03B
| $191K | ﹤0.01% |
101,933
-50,780
| -33% | -$128K |
2024 Q3
6 quarters
|
|
4360
CALL
Steven Madden
SHOO
$3.34B
| $190K | ﹤0.01% |
5,600
+1,500
| +37% | +$58.1K |
2025 Q1
4 quarters
|
|
4361
CALL
Cimpress
CMPR
$1.83B
| $190K | ﹤0.01% |
+2,600
| New | +$192K |
2026 Q1
0 quarters
|
|
4362
CALL
TORM
TRMD
$3.98B
| $190K | ﹤0.01% |
6,800
-38,000
| -85% | -$967K |
2022 Q3
14 quarters
|
|
4363
Kinetik
KNTK
$4.1B
| $190K | ﹤0.01% |
+3,919
| New | +$167K |
2026 Q1
0 quarters
|
|
4364
CALL
Rezolute
RZLT
$394M
| $190K | ﹤0.01% |
62,200
-122,200
| -66% | -$367K |
2024 Q2
7 quarters
|
|
4365
Guidewire Software
GWRE
$12.7B
| $190K | ﹤0.01% |
1,268
+1,223
| +2,718% | +$186K |
2025 Q4
1 quarter
|
|
4366
CALL
Public Storage
PSA
$53.1B
| $190K | ﹤0.01% |
700
-9,600
| -93% | -$2.75M |
2014 Q4
45 quarters
|
|
4367
CALL
Alkami Technology
ALKT
$1.5B
| $190K | ﹤0.01% |
12,100
+5,800
| +92% | +$107K |
2025 Q3
2 quarters
|
|
4368
Citi Trends
CTRN
$412M
| $190K | ﹤0.01% |
+4,375
| New | +$199K |
2026 Q1
0 quarters
|
|
4369
CALL
Simply Good Foods
SMPL
$874M
| $189K | ﹤0.01% |
13,200
-45,300
| -77% | -$781K |
2025 Q1
4 quarters
|
|
4370
PUT
NNN REIT
NNN
$7.72B
| $189K | ﹤0.01% |
4,500
-2,100
| -32% | -$90.5K |
2018 Q4
29 quarters
|
|
4371
PUT
Loar Holdings
LOAR
$5.8B
| $189K | ﹤0.01% |
3,300
+2,200
| +200% | +$148K |
2024 Q4
5 quarters
|
|
4372
CALL
UroGen Pharma
URGN
$1.98B
| $189K | ﹤0.01% |
10,500
+100
| +1% | +$2K |
2022 Q3
14 quarters
|
|
4373
PUT
SEI Investments
SEIC
$12.5B
| $188K | ﹤0.01% |
+2,400
| New | +$198K |
2026 Q1
0 quarters
|
|
4374
CALL
Icon
ICLR
$12.5B
| $188K | ﹤0.01% |
1,700
-4,700
| -73% | -$642K |
2018 Q3
30 quarters
|
|
4375
PUT
Par Pacific Holdings
PARR
$4.32B
| $188K | ﹤0.01% |
3,000
-2,400
| -44% | -$107K |
2022 Q3
14 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.