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 | |
|---|---|---|---|---|---|---|
4151
PUT
PTC
PTC
$15.8B
| $228K | ﹤0.01% |
1,600
+800
| +100% | +$126K |
|
4152
PUT
Arvinas
ARVN
$518M
| $228K | ﹤0.01% |
21,500
-4,300
| -17% | -$53.3K |
|
4153
Nexa Resources
NEXA
$1.7B
| $228K | ﹤0.01% |
21,520
+3,847
| +22% | +$44.4K |
|
4154
Photronics
PLAB
$1.79B
| $227K | ﹤0.01% |
+5,626
| New | +$203K |
|
4155
Revolve Group
RVLV
$1.8B
| $227K | ﹤0.01% |
10,055
-2,513
| -20% | -$65.9K |
|
4156
Gladstone Investment Corp
GAIN
$643M
| $227K | ﹤0.01% |
+15,997
| New | +$223K |
|
4157
CALL
Funko
FNKO
$326M
| $227K | ﹤0.01% |
72,100
+60,300
| +511% | +$240K |
|
|
CGAU
4158
Centerra Gold
CGAU
$3.36B
| $227K | ﹤0.01% |
12,748
-4,750
| -27% | -$84.5K |
|
4159
PUT
Biohaven
BHVN
$2.03B
| $227K | ﹤0.01% |
26,800
-170,300
| -86% | -$1.86M |
|
4160
Banco Bilbao Vizcaya Argentaria
BBVA
$154B
| $227K | ﹤0.01% |
+10,467
| New | +$242K |
|
4161
CALL
Xerox
XRX
$387M
| $227K | ﹤0.01% |
573,900
+371,000
| +183% | +$734K |
|
4162
Virgin Galactic
SPCE
$328M
| $227K | ﹤0.01% |
+93,276
| New | +$253K |
|
4163
PUT
Energizer
ENR
$1.44B
| $227K | ﹤0.01% |
13,800
+5,900
| +75% | +$119K |
|
4164
PUT
Ambarella
AMBA
$3.77B
| $226K | ﹤0.01% |
4,400
-26,300
| -86% | -$1.64M |
|
4165
CALL
Prothena Corp
PRTA
$425M
| $226K | ﹤0.01% |
23,300
-2,600
| -10% | -$23.8K |
|
4166
Qfin Holdings
QFIN
$1.69B
| $226K | ﹤0.01% |
+17,495
| New | +$269K |
|
4167
Vanguard Morningstar Mega Cap ETF
MGC
$9.99B
| $226K | ﹤0.01% |
955
-930
| -49% | -$231K |
|
4168
CALL
Rogers Corp
ROG
$2.21B
| $225K | ﹤0.01% |
2,100
+1,300
| +163% | +$134K |
|
4169
PUT
Danaos Corp
DAC
$2.58B
| $225K | ﹤0.01% |
2,000
+900
| +82% | +$96.1K |
|
4170
Sprott Copper Miners ETF
COPP
$262M
| $225K | ﹤0.01% |
+6,303
| New | +$245K |
|
4171
CALL
Idexx Laboratories
IDXX
$44.1B
| $225K | ﹤0.01% |
400
-2,800
| -88% | -$1.8M |
|
4172
State Street
STT
$50.6B
| $225K | ﹤0.01% |
1,775
-8,908
| -83% | -$1.14M |
|
|
4173
CALL
Qfin Holdings
QFIN
$1.69B
| $225K | ﹤0.01% |
17,400
-700
| -4% | -$10.8K |
|
4174
CALL
Dimensional US Core Equity Market ETF
DFAU
$12.4B
| $224K | ﹤0.01% |
5,800
+5,600
| +2,800% | +$263K |
|
4175
PUT
Gen Digital
GEN
$16.4B
| $224K | ﹤0.01% |
11,900
-39,600
| -77% | -$916K |
|
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.