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 | Technology | 0.62% |
| 2 | Communication Services | 0.22% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Healthcare | 0.2% |
| 5 | Industrials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
5176
PUT
CNX Resources
CNX
$4.85B
| $92.5K | ﹤0.01% |
2,400
-600
| -20% | -$23.4K |
|
|
DYNC
5177
Dynamix Corp
DYNC
$239M
| $92.4K | ﹤0.01% |
+8,828
| New | +$91.7K |
|
5178
PUT
Atmos Energy
ATO
$29.9B
| $92.4K | ﹤0.01% |
500
+300
| +150% | +$53K |
|
5179
CALL
A.O. Smith
AOS
$8.38B
| $92.3K | ﹤0.01% |
1,400
-400
| -22% | -$28.8K |
|
5180
CALL
Neurocrine Biosciences
NBIX
$17.7B
| $92.2K | ﹤0.01% |
700
+200
| +40% | +$26.5K |
|
5181
CALL
Sturm, Ruger & Co
RGR
$610M
| $92.2K | ﹤0.01% |
2,300
-400
| -15% | -$15.2K |
|
|
GOLD
5182
PUT
Gold.com Inc
GOLD
$1.14B
| $92.2K | ﹤0.01% |
2,300
-2,200
| -49% | -$108K |
|
5183
CALL
Boston Beer
SAM
$1.88B
| $92.2K | ﹤0.01% |
400
+300
| +300% | +$67.5K |
|
|
ZEPP
5184
PUT
Zepp Health
ZEPP
$71.9M
| $92K | ﹤0.01% |
7,700
-200
| -3% | -$4.09K |
|
5185
CALL
Central Garden & Pet Co Class A
CENTA
$2.41B
| $91.9K | ﹤0.01% |
+2,500
| New | +$79.7K |
|
5186
CALL
Delcath Systems
DCTH
$422M
| $91.9K | ﹤0.01% |
9,900
+1,400
| +16% | +$13.6K |
|
5187
PUT
Surgery Partners
SGRY
$2.06B
| $91.8K | ﹤0.01% |
7,700
-48,700
| -86% | -$699K |
|
5188
PUT
Old Republic International
ORI
$10.3B
| $91.8K | ﹤0.01% |
2,300
-11,700
| -84% | -$481K |
|
|
GRCE
5189
CALL
Grace Therapeutics
GRCE
$37.9M
| $91.7K | ﹤0.01% |
+19,800
| New | +$77.7K |
|
5190
CALL
Cardlytics
CDLX
$21M
| $91.7K | ﹤0.01% |
8,730
-2,700
| -24% | -$26.3K |
|
5191
CALL
Ooma
OOMA
$550M
| $91.7K | ﹤0.01% |
6,300
+4,300
| +215% | +$53.9K |
|
|
SAIL
5192
SailPoint Inc
SAIL
$8.48B
| $91.6K | ﹤0.01% |
6,921
-6,138
| -47% | -$95.8K |
|
5193
CALL
Digi International
DGII
$2.52B
| $91.6K | ﹤0.01% |
1,900
+1,800
| +1,800% | +$84.2K |
|
5194
CALL
AirSculpt Technologies
AIRS
$325M
| $91.4K | ﹤0.01% |
32,300
-20,300
| -39% | -$47.3K |
|
5195
PUT
Jones Lang LaSalle
JLL
$15.1B
| $91.3K | ﹤0.01% |
300
+100
| +50% | +$32.3K |
|
5196
PUT
MiMedx Group
MDXG
$626M
| $91.2K | ﹤0.01% |
23,100
-3,800
| -14% | -$19.1K |
|
|
ACB
5197
PUT
Aurora Cannabis
ACB
$165M
| $91.2K | ﹤0.01% |
27,900
-107,300
| -79% | -$405K |
|
5198
CALL
Sumitomo Mitsui Financial
SMFG
$166B
| $90.8K | ﹤0.01% |
+4,600
| New | +$96.6K |
|
5199
CALL
Cato Corp
CATO
$65.9M
| $90.8K | ﹤0.01% |
32,100
-4,800
| -13% | -$14.8K |
|
5200
Teucrium Agricultural Fund
TAGS
$19.6M
| $90.7K | ﹤0.01% |
+3,575
| New | +$84.5K |
|
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 withdrew a net $18.1B in Q1 2026, closing 1,574 positions and reducing 3,926 holdings. Its most notable exit was Direxion Daily Semiconductor Bull 3X ETF, an estimated $52M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.62% of assets, up from 0.59% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in Amazon worth $159M.
- 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 2,156 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.