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 | |
|---|---|---|---|---|---|---|
4126
American States Water
AWR
$3.36B
| $233K | ﹤0.01% |
+3,081
| New | +$227K |
|
4127
PUT
Becton Dickinson
BDX
$45.6B
| $232K | ﹤0.01% |
3,300
-15,500
| -82% | -$2.85M |
|
4128
Regal Rexnord
RRX
$13.7B
| $232K | ﹤0.01% |
1,240
+1,193
| +2,538% | +$222K |
|
|
MRX
4129
CALL
Marex Group Limited Ordinary Shares
MRX
$4.67B
| $232K | ﹤0.01% |
5,200
+100
| +2% | +$3.95K |
|
4130
CALL
Q2 Holdings
QTWO
$3.8B
| $232K | ﹤0.01% |
4,900
+4,400
| +880% | +$248K |
|
4131
PUT
Thor Industries
THO
$3.9B
| $232K | ﹤0.01% |
2,900
-1,400
| -33% | -$143K |
|
4132
PUT
Altimmune
ALT
$552M
| $231K | ﹤0.01% |
75,000
-487,600
| -87% | -$2.07M |
|
4133
PUT
Elicio Therapeutics
ELTX
$73.5M
| $231K | ﹤0.01% |
21,600
+21,500
| +21,500% | +$208K |
|
4134
CALL
Ziff Davis
ZD
$1.96B
| $231K | ﹤0.01% |
5,500
+3,500
| +175% | +$129K |
|
4135
Zentalis Pharmaceuticals
ZNTL
$337M
| $231K | ﹤0.01% |
+98,554
| New | +$255K |
|
|
HTT
4136
PUT
High Templar Tech Ltd
HTT
$379M
| $230K | ﹤0.01% |
118,800
+116,200
| +4,469% | +$328K |
|
4137
CALL
Perspective Therapeutics
CATX
$332M
| $230K | ﹤0.01% |
+55,200
| New | +$233K |
|
4138
CALL
Invivyd
IVVD
$158M
| $230K | ﹤0.01% |
177,000
-79,400
| -31% | -$146K |
|
4139
CALL
Banco Bilbao Vizcaya Argentaria
BBVA
$154B
| $230K | ﹤0.01% |
+10,600
| New | +$245K |
|
4140
CALL
PROG Holdings
PRG
$1.75B
| $230K | ﹤0.01% |
8,000
+7,300
| +1,043% | +$236K |
|
4141
Grindr
GRND
$3.08B
| $229K | ﹤0.01% |
18,978
-93,470
| -83% | -$1.1M |
|
4142
PUT
SSR Mining
SSRM
$5.32B
| $229K | ﹤0.01% |
7,800
-187,900
| -96% | -$4.98M |
|
4143
Xperi
XPER
$372M
| $229K | ﹤0.01% |
40,947
+38,875
| +1,876% | +$225K |
|
|
MOMO
4144
CALL
Hello Group
MOMO
$885M
| $229K | ﹤0.01% |
39,800
+9,600
| +32% | +$62.1K |
|
4145
PUT
Customers Bancorp
CUBI
$2.66B
| $229K | ﹤0.01% |
+3,300
| New | +$240K |
|
4146
CALL
Primoris Services
PRIM
$4.58B
| $229K | ﹤0.01% |
1,600
-2,600
| -62% | -$381K |
|
4147
PUT
Integer Holdings
ITGR
$4.12B
| $229K | ﹤0.01% |
2,600
+1,400
| +117% | +$119K |
|
4148
CALL
1st Source
SRCE
$2.16B
| $228K | ﹤0.01% |
+3,300
| New | +$222K |
|
4149
PUT
Assured Guaranty
AGO
$3.66B
| $228K | ﹤0.01% |
2,800
+1,400
| +100% | +$119K |
|
4150
PUT
Popular Inc
BPOP
$11.2B
| $228K | ﹤0.01% |
+1,700
| New | +$228K |
|
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.