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 |
Walmart Inc
WMT
|
+$43.6M |
| 2 |
Apple
AAPL
|
+$40.9M |
| 3 |
VanEck Oil Services ETF
OIH
|
+$37.7M |
| 4 |
Citigroup
C
|
+$34.2M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$32.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$189M |
| 2 |
Invesco QQQ Trust
QQQ
|
+$123M |
| 3 |
NVIDIA
NVDA
|
+$115M |
| 4 |
Tesla
TSLA
|
+$52M |
| 5 |
Meta Platforms (Facebook)
META
|
+$49M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.42% |
| 2 | Consumer Discretionary | 0.2% |
| 3 | Healthcare | 0.17% |
| 4 | Industrials | 0.15% |
| 5 | Communication Services | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2001
PUT
Mid-America Apartment Communities
MAA
$15.6B
| $1.87M | ﹤0.01% |
12,400
+200
| +2% | +$31.7K |
|
2002
Clear Secure
YOU
$5.26B
| $1.87M | ﹤0.01% |
+71,518
| New | +$2.03M |
|
2003
ING
ING
$93.8B
| $1.87M | ﹤0.01% |
157,239
+8,087
| +5% | +$107K |
|
|
MAXN
2004
CALL
DELISTED
Maxeon Solar Technologies
MAXN
| $1.86M | ﹤0.01% |
703
-80
| -10% | -$170K |
|
2005
PUT
ICL Group
ICL
$6.81B
| $1.86M | ﹤0.01% |
273,900
+31,500
| +13% | +$233K |
|
2006
PUT
Crane NXT
CXT
$3.04B
| $1.86M | ﹤0.01% |
47,216
+41,458
| +720% | +$1.64M |
|
2007
PUT
Unum
UNM
$13.8B
| $1.86M | ﹤0.01% |
47,000
+26,000
| +124% | +$1.07M |
|
2008
PUT
Waters Corp
WAT
$36.8B
| $1.86M | ﹤0.01% |
6,000
-6,400
| -52% | -$2.07M |
|
|
SAVE
2009
CALL
DELISTED
Spirit Airlines, Inc.
SAVE
| $1.86M | ﹤0.01% |
108,200
+45,400
| +72% | +$848K |
|
2010
PUT
Aramark
ARMK
$15B
| $1.85M | ﹤0.01% |
71,743
+27,838
| +63% | +$792K |
|
2011
CALL
Entegris
ENTG
$19.7B
| $1.85M | ﹤0.01% |
22,600
+20,900
| +1,229% | +$1.69M |
|
|
PPLI
2012
PUT
People Inc
PPLI
$3.1B
| $1.85M | ﹤0.01% |
43,640
-187,726
| -81% | -$8.04M |
|
2013
CALL
PagerDuty
PD
$700M
| $1.85M | ﹤0.01% |
52,800
+21,200
| +67% | +$622K |
|
2014
PUT
Tencent Music
TME
$14.5B
| $1.84M | ﹤0.01% |
222,700
-426,000
| -66% | -$3.49M |
|
2015
PUT
Bumble
BMBL
$367M
| $1.84M | ﹤0.01% |
94,200
-48,800
| -34% | -$1.1M |
|
2016
CALL
Blink Charging
BLNK
$75.2M
| $1.84M | ﹤0.01% |
212,800
-143,600
| -40% | -$1.51M |
|
2017
CALL
Philips
PHG
$25.4B
| $1.84M | ﹤0.01% |
117,138
+56,409
| +93% | +$811K |
|
2018
PUT
Bankunited
BKU
$3.38B
| $1.84M | ﹤0.01% |
81,400
+80,700
| +11,529% | +$2.63M |
|
2019
CALL
Alliance Resource Partners
ARLP
$3.18B
| $1.84M | ﹤0.01% |
91,100
+37,000
| +68% | +$757K |
|
2020
CALL
Cheesecake Factory
CAKE
$4.21B
| $1.84M | ﹤0.01% |
52,400
-63,600
| -55% | -$2.37M |
|
2021
CALL
Mettler-Toledo International
MTD
$26.8B
| $1.84M | ﹤0.01% |
1,200
-200
| -14% | -$300K |
|
2022
PUT
MasTec
MTZ
$26.7B
| $1.83M | ﹤0.01% |
19,400
-15,900
| -45% | -$1.51M |
|
2023
CenterPoint Energy
CNP
$29.1B
| $1.83M | ﹤0.01% |
62,053
-2,270
| -4% | -$66.3K |
|
2024
CALL
Xenon Pharmaceuticals
XENE
$6.32B
| $1.83M | ﹤0.01% |
51,100
-29,900
| -37% | -$1.1M |
|
2025
CALL
Factset
FDS
$9.05B
| $1.83M | ﹤0.01% |
4,400
+500
| +13% | +$208K |
|
Similar funds
Simplex Trading's Q1 2023 Portfolio in Review
As of Q1 2023, Simplex Trading held 10,803 positions worth $114B, up 24% from $91.9B the previous quarter. Its ten largest holdings account for 38% of the portfolio.
Simplex Trading deployed $10.1B of net new capital in Q1 2023, opening 1,536 new positions and adding to 3,665 existing holdings. Its largest new stake was Walmart Inc: 918,957 shares worth $45.2M.
By sector, the portfolio is most concentrated in Technology at 0.42% of assets, up from 0.35% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Meta Platforms (Facebook), an estimated $49M trimmed.
- Simplex Trading's largest Q1 2023 buy was Walmart Inc: 918,957 shares worth $45.2M.
- Simplex Trading added most to Apple in Q1 2023, an estimated $40.9M increase.
- Simplex Trading's biggest Q1 2023 reduction was Meta Platforms (Facebook), cutting an estimated $49M.
- Simplex Trading fully exited Amazon in Q1 2023, selling an estimated $189M.
- Simplex Trading's ten largest holdings make up 38% of its $114B portfolio in Q1 2023.
- Simplex Trading opened 1,536 new positions and closed 1,729 in Q1 2023.
- Simplex Trading's portfolio value rose 24% quarter-over-quarter to $114B.
Based on Simplex Trading's 13F filing for Q1 2023, filed 27 Apr 2023.