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 | |
|---|---|---|---|---|---|---|---|
5301
Sturm, Ruger & Co
RGR
$709M
| $83.1K | ﹤0.01% |
2,074
+998
| +93% | +$37.9K |
2025 Q4
1 quarter
|
|
5302
PUT
Atossa Therapeutics
ATOS
$23.4M
| $83.1K | ﹤0.01% |
+15,800
| New | +$100K |
2026 Q1
0 quarters
|
|
5303
CALL
Itaú Unibanco
ITUB
$94.7B
| $83K | ﹤0.01% |
9,900
+1,300
| +15% | +$10.9K |
2014 Q4
45 quarters
|
|
|
BRSL
5304
CALL
Brightstar Lottery PLC
BRSL
$1.8B
| $82.8K | ﹤0.01% |
6,500
-1,100
| -14% | -$15.2K |
2016 Q3
38 quarters
|
|
|
AGIX
5305
KraneShares Public-Private AI & Technology ETF
AGIX
$1.18B
| $82.7K | ﹤0.01% |
+2,525
| New | +$88.1K |
2026 Q1
0 quarters
|
|
5306
CALL
Perrigo
PRGO
$1.98B
| $82.7K | ﹤0.01% |
7,700
-86,900
| -92% | -$1.13M |
2015 Q1
44 quarters
|
|
5307
Genesco
GCO
$377M
| $82.7K | ﹤0.01% |
2,852
+2,481
| +669% | +$71.3K |
2025 Q4
1 quarter
|
|
5308
CALL
United States Gasoline Fund
UGA
$194M
| $82.7K | ﹤0.01% |
800
+500
| +167% | +$38.4K |
2017 Q2
35 quarters
|
|
|
GTM
5309
PUT
ZoomInfo Technologies
GTM
$1.08B
| $82.5K | ﹤0.01% |
13,800
+400
| +3% | +$2.94K |
2020 Q3
22 quarters
|
|
5310
PUT
Financial Institutions
FISI
$788M
| $82.4K | ﹤0.01% |
2,600
+600
| +30% | +$19.3K |
2025 Q4
1 quarter
|
|
5311
Morgan Stanley Direct Lending Fund
MSDL
$1.14B
| $82.3K | ﹤0.01% |
+5,896
| New | +$91.2K |
2026 Q1
0 quarters
|
|
5312
CALL
Grindr
GRND
$2.33B
| $82.2K | ﹤0.01% |
6,800
-65,800
| -91% | -$776K |
2023 Q3
10 quarters
|
|
5313
CALL
Helen of Troy
HELE
$623M
| $82.2K | ﹤0.01% |
5,700
-45,100
| -89% | -$788K |
2021 Q2
19 quarters
|
|
5314
PUT
Warby Parker
WRBY
$3.34B
| $82.2K | ﹤0.01% |
3,900
-142,200
| -97% | -$3.53M |
2021 Q4
17 quarters
|
|
5315
PUT
Pliant Therapeutics
PLRX
$63.8M
| $82.2K | ﹤0.01% |
65,200
+45,600
| +233% | +$57.6K |
2025 Q2
3 quarters
|
|
5316
Simulations Plus
SLP
$374M
| $81.9K | ﹤0.01% |
6,932
+4,961
| +252% | +$73.1K |
2025 Q1
4 quarters
|
|
5317
PUT
Power Integrations
POWI
$3.04B
| $81.9K | ﹤0.01% |
1,600
-8,900
| -85% | -$408K |
2025 Q3
2 quarters
|
|
5318
CALL
Capital Southwest
CSWC
$1.5B
| $81.8K | ﹤0.01% |
3,700
-600
| -14% | -$13.6K |
2021 Q1
20 quarters
|
|
5319
CALL
Rexford Industrial Realty
REXR
$8.18B
| $81.8K | ﹤0.01% |
2,500
-6,800
| -73% | -$255K |
2024 Q3
6 quarters
|
|
5320
PUT
Mirion Technologies
MIR
$3.55B
| $81.8K | ﹤0.01% |
4,400
-5,700
| -56% | -$129K |
2021 Q1
20 quarters
|
|
|
GRID
5321
PUT
First Trust NASDAQ Clean Edge Smart Grid Infrastructure Index Fund
GRID
$12.2B
| $81.8K | ﹤0.01% |
+500
| New | +$83.1K |
2026 Q1
0 quarters
|
|
5322
iShares MSCI Global Gold Miners ETF
RING
$2.32B
| $81.7K | ﹤0.01% |
1,035
+454
| +78% | +$38.5K |
2025 Q3
2 quarters
|
|
|
PMT
5323
CALL
PennyMac Mortgage Investment
PMT
$680M
| $81.6K | ﹤0.01% |
7,000
-2,900
| -29% | -$35.8K |
2019 Q1
28 quarters
|
|
5324
PUT
California Water Service
CWT
$2.84B
| $81.6K | ﹤0.01% |
1,800
+1,600
| +800% | +$71.8K |
2025 Q4
1 quarter
|
|
5325
PUT
Relay Therapeutics
RLAY
$4.15B
| $81.6K | ﹤0.01% |
8,200
+8,100
| +8,100% | +$72.5K |
2025 Q4
1 quarter
|
|
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.