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 | |
|---|---|---|---|---|---|---|---|
5451
Cardlytics
CDLX
$14.9M
| $72.9K | ﹤0.01% |
6,940
-11,698
| -63% | -$114K |
2023 Q3
10 quarters
|
|
|
GXRP
5452
CALL
Grayscale XRP Trust ETF
GXRP
$69.5M
| $72.9K | ﹤0.01% |
+2,800
| New | +$87.6K |
2026 Q1
0 quarters
|
|
5453
CALL
Snap-on
SNA
$19.1B
| $72.6K | ﹤0.01% |
200
-1,200
| -86% | -$445K |
2015 Q1
44 quarters
|
|
5454
CALL
Relay Therapeutics
RLAY
$4.15B
| $72.6K | ﹤0.01% |
7,300
-38,300
| -84% | -$343K |
2025 Q1
4 quarters
|
|
5455
CALL
Dyne Therapeutics
DYN
$2.84B
| $72.5K | ﹤0.01% |
4,000
-31,600
| -89% | -$545K |
2023 Q4
9 quarters
|
|
|
JBGS
5456
JBG SMITH
JBGS
$619M
| $72.3K | ﹤0.01% |
+4,952
| New | +$79K |
2026 Q1
0 quarters
|
|
|
WAY
5457
CALL
Waystar Holding Corp
WAY
$4.76B
| $72.3K | ﹤0.01% |
3,000
-9,500
| -76% | -$252K |
2024 Q4
5 quarters
|
|
|
OLPX
5458
PUT
DELISTED
Olaplex Holdings
OLPX
| $72.3K | ﹤0.01% |
+35,600
| New | +$54.6K |
2026 Q1
0 quarters
|
|
5459
CALL
Dakota Gold
DC
$794M
| $72.2K | ﹤0.01% |
14,300
-33,100
| -70% | -$196K |
2025 Q4
1 quarter
|
|
5460
CALL
Inspire Medical Systems
INSP
$2.02B
| $72.2K | ﹤0.01% |
1,400
-3,300
| -70% | -$231K |
2021 Q1
20 quarters
|
|
5461
Baytex Energy
BTE
$3.24B
| $72.2K | ﹤0.01% |
+16,142
| New | +$59.6K |
2026 Q1
0 quarters
|
|
5462
iShares MSCI Global Metals & Mining Producers ETF
PICK
$2.43B
| $72K | ﹤0.01% |
1,273
+826
| +185% | +$48K |
2025 Q4
1 quarter
|
|
|
SMST
5463
PUT
Defiance Daily Target 2x Short MSTR ETF
SMST
$28.1M
| $72K | ﹤0.01% |
2,700
-9,000
| -77% | -$644K |
2025 Q2
3 quarters
|
|
5464
CALL
AMC Global Media
AMCX
$460M
| $72K | ﹤0.01% |
10,600
-3,900
| -27% | -$30.4K |
2021 Q2
19 quarters
|
|
5465
Brink's
BCO
$4.19B
| $71.8K | ﹤0.01% |
+693
| New | +$83.1K |
2026 Q1
0 quarters
|
|
|
PURR
5466
PUT
Hyperliquid Strategies Inc
PURR
$2.35B
| $71.8K | ﹤0.01% |
+14,100
| New | +$63.8K |
2026 Q1
0 quarters
|
|
5467
Progressive
PGR
$122B
| $71.8K | ﹤0.01% |
362
-14,996
| -98% | -$3.1M |
2025 Q4
1 quarter
|
|
|
SY
5468
So-Young International
SY
$277M
| $71.7K | ﹤0.01% |
26,267
-17,372
| -40% | -$52K |
2024 Q4
5 quarters
|
|
5469
AtriCure
ATRC
$2.8B
| $71.7K | ﹤0.01% |
+2,512
| New | +$85.7K |
2026 Q1
0 quarters
|
|
|
FFAI
5470
Faraday Future Intelligent Electric
FFAI
$7.54M
| $71.6K | ﹤0.01% |
+1,736
| New | +$179K |
2026 Q1
0 quarters
|
|
|
CYPH
5471
PUT
Cypherpunk Technologies Inc
CYPH
$327M
| $71.5K | ﹤0.01% |
89,900
-10,200
| -10% | -$7.87K |
2025 Q4
1 quarter
|
|
5472
PUT
Avantor
AVTR
$10.4B
| $71.3K | ﹤0.01% |
9,100
-101,000
| -92% | -$994K |
2019 Q2
27 quarters
|
|
5473
PUT
Grindr
GRND
$2.33B
| $71.3K | ﹤0.01% |
5,900
-150,100
| -96% | -$1.77M |
2023 Q2
11 quarters
|
|
5474
Sagimet Biosciences
SGMT
$568M
| $71.2K | ﹤0.01% |
13,636
-591
| -4% | -$3.29K |
2025 Q4
1 quarter
|
|
5475
PUT
Radiant Logistics
RLGT
$439M
| $71.2K | ﹤0.01% |
10,100
-36,400
| -78% | -$255K |
2023 Q3
10 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.