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 | |
|---|---|---|---|---|---|---|---|
5226
CALL
Lantronix
LTRX
$337M
| $89.1K | ﹤0.01% |
17,000
+9,400
| +124% | +$57.5K |
2025 Q4
1 quarter
|
|
5227
PUT
Public Service Enterprise Group
PEG
$33.9B
| $89K | ﹤0.01% |
+1,100
| New | +$90.2K |
2026 Q1
0 quarters
|
|
5228
CALL
HighPeak Energy
HPK
$993M
| $89K | ﹤0.01% |
12,900
+12,800
| +12,800% | +$67.2K |
2022 Q3
14 quarters
|
|
5229
CALL
Payoneer
PAYO
$2.42B
| $88.9K | ﹤0.01% |
18,400
+12,200
| +197% | +$64.3K |
2021 Q2
19 quarters
|
|
|
KW
5230
PUT
DELISTED
Kennedy-Wilson Holdings
KW
| $88.7K | ﹤0.01% |
8,200
+6,500
| +382% | +$67.4K |
2025 Q2
3 quarters
|
|
5231
Global X Artificial Intelligence & Technology ETF
AIQ
$10.5B
| $88.7K | ﹤0.01% |
1,900
-8,550
| -82% | -$429K |
2025 Q4
1 quarter
|
|
5232
CALL
NiSource
NI
$18.9B
| $88.7K | ﹤0.01% |
1,900
-11,800
| -86% | -$532K |
2018 Q2
31 quarters
|
|
|
HPP
5233
CALL
Hudson Pacific Properties
HPP
$623M
| $88.7K | ﹤0.01% |
15,000
-57,400
| -79% | -$441K |
2020 Q2
23 quarters
|
|
5234
CALL
Mueller Industries
MLI
$13.8B
| $88.6K | ﹤0.01% |
1,600
-1,400
| -47% | -$83.9K |
2021 Q2
19 quarters
|
|
5235
PUT
Golub Capital BDC
GBDC
$3.26B
| $88.6K | ﹤0.01% |
7,000
-3,900
| -36% | -$50K |
2020 Q1
24 quarters
|
|
|
GCPU
5236
Grayscale AI Compute ETF
GCPU
$11.8M
| $88.5K | ﹤0.01% |
3,475
-1,962
| -36% | -$62.4K |
2025 Q4
1 quarter
|
|
5237
PUT
Embecta
EMBC
$320M
| $88.4K | ﹤0.01% |
10,000
+7,700
| +335% | +$80.2K |
2022 Q4
13 quarters
|
|
|
BTQ
5238
PUT
BTQ Technologies Corp
BTQ
$466M
| $88.4K | ﹤0.01% |
33,100
+14,600
| +79% | +$51.5K |
2025 Q4
1 quarter
|
|
5239
CALL
Atkore
ATKR
$3.2B
| $88.4K | ﹤0.01% |
1,500
+1,400
| +1,400% | +$91K |
2018 Q4
29 quarters
|
|
5240
State Street SPDR S&P Homebuilders ETF
XHB
$1.49B
| $88.4K | ﹤0.01% |
895
-16,486
| -95% | -$1.81M |
2025 Q2
3 quarters
|
|
|
SGMO
5241
PUT
DELISTED
SANGAMO THERAPEUTICS INC
SGMO
| $88.3K | ﹤0.01% |
357,500
+73,200
| +26% | +$29.1K |
2024 Q3
6 quarters
|
|
|
OFRM
5242
CALL
Once Upon a Farm PBC
OFRM
$681M
| $88.3K | ﹤0.01% |
+5,400
| New | +$111K |
2026 Q1
0 quarters
|
|
5243
CALL
Rani Therapeutics
RANI
$93.6M
| $88.3K | ﹤0.01% |
120,100
-352,400
| -75% | -$450K |
2024 Q1
8 quarters
|
|
5244
Ivanhoe Electric
IE
$1.67B
| $87.9K | ﹤0.01% |
7,440
-45,321
| -86% | -$710K |
2024 Q3
6 quarters
|
|
5245
CALL
Thor Industries
THO
$3.59B
| $87.9K | ﹤0.01% |
1,100
-8,200
| -88% | -$836K |
2016 Q1
40 quarters
|
|
5246
PUT
Inseego
INSG
$75.7M
| $87.8K | ﹤0.01% |
7,900
+6,200
| +365% | +$69.8K |
2024 Q1
8 quarters
|
|
5247
CALL
Duos Technologies
DUOT
$287M
| $87.8K | ﹤0.01% |
12,800
+1,000
| +8% | +$8.9K |
2025 Q4
1 quarter
|
|
|
RYZ
5248
CALL
Ryerson Holding Corp
RYZ
$1.33B
| $87.7K | ﹤0.01% |
3,900
+3,500
| +875% | +$91.2K |
2025 Q2
3 quarters
|
|
|
AD
5249
PUT
Array Digital Infrastructure
AD
$2.97B
| $87.7K | ﹤0.01% |
+1,900
| New | +$94.7K |
2026 Q1
0 quarters
|
|
|
CAI
5250
PUT
Caris Life Sciences
CAI
$8B
| $87.6K | ﹤0.01% |
4,900
-6,000
| -55% | -$131K |
2025 Q2
3 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.