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 | |
|---|---|---|---|---|---|---|
3951
PUT
Fortive
FTV
$19.5B
| $272K | ﹤0.01% |
+5,308
| New | +$267K |
|
|
SOL
3952
DELISTED
Emeren Group
SOL
| $272K | ﹤0.01% |
61,309
-4,922
| -7% | -$23.1K |
|
|
CEI
3953
CALL
DELISTED
Camber Energy, Inc
CEI
| $272K | ﹤0.01% |
172,400
-90,500
| -34% | -$157K |
|
3954
CALL
W&T Offshore
WTI
$473M
| $271K | ﹤0.01% |
53,500
-57,200
| -52% | -$320K |
|
|
ENZ
3955
CALL
DELISTED
Enzo Biochem, Inc.
ENZ
| $271K | ﹤0.01% |
+111,600
| New | +$166K |
|
|
DNMR
3956
DELISTED
Danimer Scientific, Inc.
DNMR
| $271K | ﹤0.01% |
+1,964
| New | +$180K |
|
3957
CALL
Compass Diversified
CODI
$777M
| $270K | ﹤0.01% |
14,200
+2,800
| +25% | +$57.3K |
|
3958
PUT
Iovance Biotherapeutics
IOVA
$2.1B
| $270K | ﹤0.01% |
44,300
+13,400
| +43% | +$92.5K |
|
3959
PUT
Lufax Holding
LU
$1.33B
| $270K | ﹤0.01% |
33,150
-2,825
| -8% | -$27.1K |
|
3960
PUT
Raymond James Financial
RJF
$34B
| $270K | ﹤0.01% |
2,900
-27,300
| -90% | -$2.89M |
|
3961
Procore
PCOR
$7.37B
| $269K | ﹤0.01% |
4,296
+3,112
| +263% | +$182K |
|
|
ENLC
3962
PUT
DELISTED
ENLINK MIDSTREAM, LLC
ENLC
| $269K | ﹤0.01% |
24,900
-71,500
| -74% | -$847K |
|
3963
iShares 10-20 Year Treasury Bond ETF
TLH
$11.1B
| $268K | ﹤0.01% |
2,346
+1,693
| +259% | +$190K |
|
|
ATHX
3964
CALL
DELISTED
Athersys, Inc. Common Stock
ATHX
| $268K | ﹤0.01% |
218,100
+111,600
| +105% | +$159K |
|
3965
Archer Aviation
ACHR
$3.68B
| $267K | ﹤0.01% |
93,527
+52,307
| +127% | +$141K |
|
3966
PUT
Golar LNG
GLNG
$4.95B
| $267K | ﹤0.01% |
12,400
+3,500
| +39% | +$78.4K |
|
3967
CALL
iShares S&P GSCI Commodity-Indexed Trust
GSG
$968M
| $267K | ﹤0.01% |
13,300
+2,300
| +21% | +$46.8K |
|
3968
CALL
Hubbell
HUBB
$25.6B
| $267K | ﹤0.01% |
1,100
+1,000
| +1,000% | +$239K |
|
3969
CALL
Kennametal
KMT
$2.71B
| $267K | ﹤0.01% |
9,700
+7,100
| +273% | +$196K |
|
3970
CALL
Ryder
R
$9.98B
| $267K | ﹤0.01% |
3,000
-2,500
| -45% | -$230K |
|
|
KEEL
3971
CALL
Keel Infrastructure Corp
KEEL
$2.25B
| $266K | ﹤0.01% |
274,700
+102,300
| +59% | +$95.6K |
|
3972
PUT
Sotera Health
SHC
$5.06B
| $266K | ﹤0.01% |
14,900
+14,700
| +7,350% | +$246K |
|
3973
CALL
Workiva
WK
$3.28B
| $266K | ﹤0.01% |
2,600
+800
| +44% | +$72.5K |
|
3974
Zillow
Z
$7.7B
| $266K | ﹤0.01% |
5,999
| – | – |
|
|
BIG
3975
CALL
DELISTED
Big Lots, Inc.
BIG
| $266K | ﹤0.01% |
24,300
-51,800
| -68% | -$783K |
|
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.