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 | |
|---|---|---|---|---|---|---|
3976
United States Copper Index Fund
CPER
$742M
| $265K | ﹤0.01% |
10,635
-17,423
| -62% | -$432K |
|
|
FINV
3977
CALL
FinVolution Group
FINV
$1.16B
| $265K | ﹤0.01% |
63,600
-216,700
| -77% | -$1.1M |
|
3978
CALL
Worthington Enterprises
WOR
$2.82B
| $265K | ﹤0.01% |
6,650
+3,568
| +116% | +$126K |
|
|
OLK
3979
PUT
DELISTED
Olink Holding AB (publ) American Depositary Shares
OLK
| $265K | ﹤0.01% |
11,800
+8,000
| +211% | +$174K |
|
3980
CALL
Casella Waste Systems
CWST
$5.79B
| $264K | ﹤0.01% |
+3,200
| New | +$253K |
|
|
EH
3981
EHang Holdings
EH
$397M
| $264K | ﹤0.01% |
24,230
-29,721
| -55% | -$346K |
|
3982
CALL
Ingredion
INGR
$6.48B
| $264K | ﹤0.01% |
2,600
+2,300
| +767% | +$229K |
|
|
SFIX
3983
CALL
Stitch Fix
SFIX
$563M
| $264K | ﹤0.01% |
51,700
-178,400
| -78% | -$836K |
|
3984
CALL
Signet Jewelers
SIG
$3.81B
| $264K | ﹤0.01% |
3,400
-11,600
| -77% | -$860K |
|
3985
CALL
Coeur Mining
CDE
$15.4B
| $263K | ﹤0.01% |
66,000
-83,500
| -56% | -$290K |
|
3986
CALL
Immersion
IMMR
$254M
| $263K | ﹤0.01% |
29,500
+20,600
| +231% | +$156K |
|
3987
Digital Turbine
APPS
$1.02B
| $262K | ﹤0.01% |
21,222
+3,632
| +21% | +$48.8K |
|
3988
CALL
3D Systems Corp
DDD
$412M
| $262K | ﹤0.01% |
24,500
-69,500
| -74% | -$708K |
|
3989
PUT
Flex
FLEX
$41.5B
| $262K | ﹤0.01% |
15,128
-2,787
| -16% | -$48.2K |
|
3990
CALL
Nerdy
NRDY
$110M
| $262K | ﹤0.01% |
+62,900
| New | +$192K |
|
3991
PUT
Steven Madden
SHOO
$3.22B
| $262K | ﹤0.01% |
7,300
-4,100
| -36% | -$142K |
|
3992
PUT
FerroAtlántica
GSM
$628M
| $261K | ﹤0.01% |
53,000
-602,000
| -92% | -$2.78M |
|
3993
PUT
Pegasystems
PEGA
$4.85B
| $261K | ﹤0.01% |
10,800
+9,800
| +980% | +$206K |
|
3994
PUT
Timken Company
TKR
$9.72B
| $261K | ﹤0.01% |
3,200
+2,800
| +700% | +$227K |
|
3995
CALL
TPG
TPG
$7.02B
| $261K | ﹤0.01% |
8,900
-3,900
| -30% | -$122K |
|
3996
PUT
BorgWarner
BWA
$13B
| $260K | ﹤0.01% |
6,021
-8,406
| -58% | -$348K |
|
|
DADA
3997
CALL
DELISTED
Dada Nexus
DADA
| $260K | ﹤0.01% |
30,700
+9,700
| +46% | +$106K |
|
3998
CALL
Healthcare Realty
HR
$7.58B
| $260K | ﹤0.01% |
13,500
+8,300
| +160% | +$167K |
|
|
3999
Immersion
IMMR
$254M
| $260K | ﹤0.01% |
29,152
+15,338
| +111% | +$116K |
|
4000
PUT
iRhythm Holdings
IRTC
$3.86B
| $260K | ﹤0.01% |
2,100
-5,600
| -73% | -$607K |
|
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.