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 | |
|---|---|---|---|---|---|---|
2001
PUT
Corvus Pharmaceuticals
CRVS
$1.13B
| $1.66M | ﹤0.01% |
113,300
+88,100
| +350% | +$1.41M |
|
2002
CALL
MKS Inc
MKSI
$20.6B
| $1.65M | ﹤0.01% |
7,200
-28,400
| -80% | -$6.42M |
|
2003
PUT
Nabors Industries
NBR
$1.19B
| $1.65M | ﹤0.01% |
19,200
+15,900
| +482% | +$1.15M |
|
|
LINE
2004
PUT
Lineage Inc
LINE
$9.56B
| $1.65M | ﹤0.01% |
50,400
+23,900
| +90% | +$885K |
|
2005
CALL
F5
FFIV
$22.5B
| $1.65M | ﹤0.01% |
5,700
-600
| -10% | -$166K |
|
2006
PUT
Valaris
VAL
$5.44B
| $1.65M | ﹤0.01% |
16,800
-21,900
| -57% | -$1.71M |
|
2007
PUT
Icahn Enterprises
IEP
$5.16B
| $1.65M | ﹤0.01% |
217,900
+45,700
| +27% | +$358K |
|
2008
Range Resources
RRC
$9.1B
| $1.64M | ﹤0.01% |
36,320
-12,790
| -26% | -$499K |
|
2009
CALL
Sysco
SYY
$40B
| $1.64M | ﹤0.01% |
23,000
-25,900
| -53% | -$2.14M |
|
|
SGI
2010
CALL
Somnigroup International
SGI
$15.4B
| $1.63M | ﹤0.01% |
+22,100
| New | +$1.92M |
|
2011
Applied Digital
APLD
$7.46B
| $1.63M | ﹤0.01% |
68,735
-164,934
| -71% | -$5.16M |
|
2012
PUT
Intellia Therapeutics
NTLA
$1.51B
| $1.63M | ﹤0.01% |
127,100
-263,100
| -67% | -$3.35M |
|
2013
CALL
Babcock & Wilcox
BW
$1.39B
| $1.63M | ﹤0.01% |
+110,900
| New | +$1.17M |
|
2014
Builders FirstSource
BLDR
$7.8B
| $1.63M | ﹤0.01% |
19,773
+3,913
| +25% | +$418K |
|
|
MFA
2015
PUT
MFA Financial
MFA
$934M
| $1.63M | ﹤0.01% |
169,700
+2,700
| +2% | +$26.6K |
|
2016
CALL
Trane Technologies
TT
$106B
| $1.63M | ﹤0.01% |
3,900
-2,100
| -35% | -$892K |
|
2017
Centuri Holdings
CTRI
$2.72B
| $1.62M | ﹤0.01% |
55,450
+43,170
| +352% | +$1.26M |
|
2018
CALL
Vermilion Energy
VET
$1.66B
| $1.62M | ﹤0.01% |
117,500
-109,500
| -48% | -$1.16M |
|
2019
GlobalFoundries
GFS
$28.4B
| $1.62M | ﹤0.01% |
36,395
-46,090
| -56% | -$2.03M |
|
2020
PUT
Global Payments
GPN
$22.8B
| $1.62M | ﹤0.01% |
24,000
-91,000
| -79% | -$6.71M |
|
2021
CALL
Vanguard Total International Stock ETF
VXUS
$153B
| $1.6M | ﹤0.01% |
20,800
+17,700
| +571% | +$1.41M |
|
2022
PUT
SentinelOne
S
$6.29B
| $1.6M | ﹤0.01% |
124,500
-87,200
| -41% | -$1.21M |
|
|
KDK
2023
CALL
Kodiak AI
KDK
$815M
| $1.6M | ﹤0.01% |
230,100
+63,300
| +38% | +$554K |
|
2024
CALL
Sterling Infrastructure
STRL
$18.9B
| $1.59M | ﹤0.01% |
3,900
+100
| +3% | +$39.1K |
|
|
NUAI
2025
New Era Energy & Digital Inc
NUAI
$474M
| $1.59M | ﹤0.01% |
+390,886
| New | +$1.96M |
|
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.