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 | |
|---|---|---|---|---|---|---|
1776
CALL
Penske Automotive Group
PAG
$14.3B
| $2.45M | ﹤0.01% |
17,300
-11,700
| -40% | -$1.56M |
|
1777
CALL
Full Truck Alliance
YMM
$9.56B
| $2.45M | ﹤0.01% |
322,400
-191,700
| -37% | -$1.52M |
|
1778
CALL
Krispy Kreme
DNUT
$543M
| $2.45M | ﹤0.01% |
157,400
+29,600
| +23% | +$384K |
|
1779
CALL
Doximity
DOCS
$3.67B
| $2.44M | ﹤0.01% |
75,400
-12,800
| -15% | -$425K |
|
|
XM
1780
PUT
DELISTED
Qualtrics International Inc. Class A Common Stock
XM
| $2.44M | ﹤0.01% |
136,700
+33,300
| +32% | +$509K |
|
|
DISH
1781
CALL
DELISTED
DISH Network Corp.
DISH
| $2.44M | ﹤0.01% |
261,300
-52,800
| -17% | -$666K |
|
|
ONC
1782
CALL
BeOne Medicines Ltd
ONC
$33.8B
| $2.44M | ﹤0.01% |
11,300
+10,000
| +769% | +$2.4M |
|
1783
CALL
Biomea Fusion
BMEA
$90.4M
| $2.43M | ﹤0.01% |
78,400
+76,400
| +3,820% | +$949K |
|
1784
CALL
Murphy Oil
MUR
$5.58B
| $2.43M | ﹤0.01% |
65,700
+49,900
| +316% | +$1.99M |
|
1785
CALL
RenaissanceRe
RNR
$13.8B
| $2.42M | ﹤0.01% |
12,100
+11,900
| +5,950% | +$2.4M |
|
1786
CALL
Raymond James Financial
RJF
$32.5B
| $2.42M | ﹤0.01% |
25,900
+12,300
| +90% | +$1.3M |
|
1787
CALL
Transmedics
TMDX
$2.5B
| $2.42M | ﹤0.01% |
31,900
+29,000
| +1,000% | +$2.01M |
|
1788
CALL
FIVE9
FIVN
$1.77B
| $2.41M | ﹤0.01% |
33,400
-7,800
| -19% | -$558K |
|
1789
PUT
Bausch Health
BHC
$1.65B
| $2.41M | ﹤0.01% |
298,000
+17,000
| +6% | +$137K |
|
1790
ProShares UltraPro Short S&P 500
SPXU
$436M
| $2.41M | ﹤0.01% |
8,935
+8,065
| +927% | +$2.39M |
|
|
ETNB
1791
DELISTED
89bio
ETNB
| $2.4M | ﹤0.01% |
157,700
+88,017
| +126% | +$1.15M |
|
1792
ZIM Integrated Shipping Services
ZIM
$3B
| $2.4M | ﹤0.01% |
101,855
+68,886
| +209% | +$1.45M |
|
1793
PUT
Eastman Chemical
EMN
$7.8B
| $2.4M | ﹤0.01% |
28,400
+24,700
| +668% | +$2.12M |
|
|
ETNB
1794
PUT
DELISTED
89bio
ETNB
| $2.4M | ﹤0.01% |
157,300
+154,200
| +4,974% | +$2.01M |
|
1795
PUT
Honda
HMC
$36.5B
| $2.39M | ﹤0.01% |
90,300
+72,800
| +416% | +$1.83M |
|
|
JKS
1796
PUT
JinkoSolar
JKS
$775M
| $2.39M | ﹤0.01% |
46,900
-49,800
| -51% | -$2.61M |
|
1797
Weibo
WB
$1.9B
| $2.38M | ﹤0.01% |
+118,883
| New | +$2.43M |
|
|
LKFT
1798
CALL
Lakefront Biotherapeutics American Depositary Shares
LKFT
$1.82B
| $2.38M | ﹤0.01% |
61,600
+21,700
| +54% | +$892K |
|
1799
McCormick & Company Non-Voting
MKC
$13.4B
| $2.38M | ﹤0.01% |
+28,576
| New | +$2.18M |
|
1800
PUT
Elastic
ESTC
$6.1B
| $2.37M | ﹤0.01% |
41,000
-31,500
| -43% | -$1.8M |
|
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.