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 | |
|---|---|---|---|---|---|---|
|
IPG
1976
CALL
DELISTED
Interpublic Group of Companies
IPG
| $1.93M | ﹤0.01% |
51,900
-9,900
| -16% | -$356K |
|
1977
CALL
McCormick & Company Non-Voting
MKC
$13.4B
| $1.93M | ﹤0.01% |
23,200
+17,200
| +287% | +$1.31M |
|
1978
PUT
Icahn Enterprises
IEP
$5.17B
| $1.93M | ﹤0.01% |
37,300
-11,000
| -23% | -$582K |
|
1979
CALL
Rogers Corp
ROG
$2.33B
| $1.93M | ﹤0.01% |
11,800
+7,700
| +188% | +$1.11M |
|
1980
PUT
Chegg
CHGG
$108M
| $1.93M | ﹤0.01% |
118,200
+76,500
| +183% | +$1.43M |
|
1981
CALL
Teledyne Technologies
TDY
$30.4B
| $1.92M | ﹤0.01% |
4,300
+1,200
| +39% | +$508K |
|
1982
PUT
Landstar System
LSTR
$6.8B
| $1.92M | ﹤0.01% |
10,700
+10,500
| +5,250% | +$1.85M |
|
|
ABB
1983
DELISTED
ABB Ltd
ABB
| $1.92M | ﹤0.01% |
55,896
+49,721
| +805% | +$1.67M |
|
1984
iShares Core MSCI Emerging Markets ETF
IEMG
$149B
| $1.91M | ﹤0.01% |
39,221
+36,647
| +1,424% | +$1.8M |
|
1985
JB Hunt Transport Services
JBHT
$27.1B
| $1.91M | ﹤0.01% |
10,887
+6,435
| +145% | +$1.17M |
|
|
TGR
1986
PUT
DELISTED
ISHARES TARGET DATE RETIREMENT INCOME ETF
TGR
| $1.91M | ﹤0.01% |
101,400
+82,800
| +445% | +$1.56M |
|
1987
CALL
WD-40
WDFC
$3.1B
| $1.91M | ﹤0.01% |
10,700
+9,400
| +723% | +$1.62M |
|
1988
PUT
FTAI Aviation
FTAI
$22.2B
| $1.9M | ﹤0.01% |
75,600
-30,100
| -28% | -$711K |
|
1989
PUT
Weyerhaeuser
WY
$17.3B
| $1.9M | ﹤0.01% |
63,000
+1,900
| +3% | +$59.9K |
|
1990
CALL
Vanguard Short-Term Treasury ETF
VGSH
$29.3B
| $1.89M | ﹤0.01% |
28,300
-21,600
| -43% | -$1.25M |
|
1991
CALL
Sigma Lithium
SGML
$1.08B
| $1.89M | ﹤0.01% |
50,200
+39,200
| +356% | +$1.26M |
|
1992
CALL
monday.com
MNDY
$3.27B
| $1.88M | ﹤0.01% |
13,200
-5,700
| -30% | -$771K |
|
|
OSG
1993
Octave Specialty Group
OSG
$252M
| $1.88M | ﹤0.01% |
121,605
+106,206
| +690% | +$1.72M |
|
1994
CALL
Kinross Gold
KGC
$28.5B
| $1.88M | ﹤0.01% |
535,500
-396,500
| -43% | -$1.68M |
|
1995
CALL
Meritage Homes
MTH
$4.87B
| $1.88M | ﹤0.01% |
32,200
+30,600
| +1,913% | +$1.65M |
|
1996
CALL
SBA Communications
SBAC
$18.4B
| $1.88M | ﹤0.01% |
7,200
+6,900
| +2,300% | +$1.9M |
|
|
JKS
1997
CALL
JinkoSolar
JKS
$775M
| $1.88M | ﹤0.01% |
36,800
-74,100
| -67% | -$3.88M |
|
1998
PUT
Universal Display
OLED
$3.71B
| $1.88M | ﹤0.01% |
12,100
+800
| +7% | +$108K |
|
1999
CALL
Illinois Tool Works
ITW
$81.4B
| $1.87M | ﹤0.01% |
7,700
+2,400
| +45% | +$560K |
|
2000
CALL
Inspire Medical Systems
INSP
$1.42B
| $1.87M | ﹤0.01% |
8,000
+7,300
| +1,043% | +$1.85M |
|
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.