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 | |
|---|---|---|---|---|---|---|
|
JBTM
6101
CALL
JBT Marel
JBTM
$7.21B
| $43K | ﹤0.01% |
+400
| New | +$42.3K |
|
|
QUOT
6102
DELISTED
Quotient Technology Inc
QUOT
| $43K | ﹤0.01% |
+13,219
| New | +$46.9K |
|
|
CSII
6103
PUT
DELISTED
Cardiovascular Systems, Inc.
CSII
| $43K | ﹤0.01% |
2,200
+700
| +47% | +$12.1K |
|
6104
PUT
Broadstone Net Lease
BNL
$4.11B
| $42K | ﹤0.01% |
2,500
+900
| +56% | +$15.7K |
|
6105
CALL
BeyondSpring
BYSI
$47.3M
| $42K | ﹤0.01% |
37,600
+7,100
| +23% | +$13.8K |
|
6106
EverQuote
EVER
$892M
| $42K | ﹤0.01% |
+3,065
| New | +$45.8K |
|
6107
CALL
HUTCHMED
HCM
$1.93B
| $42K | ﹤0.01% |
3,300
+1,300
| +65% | +$21.3K |
|
|
INFA
6108
CALL
DELISTED
Informatica
INFA
| $42K | ﹤0.01% |
2,600
+400
| +18% | +$6.79K |
|
6109
Inspire Medical Systems
INSP
$1.45B
| $42K | ﹤0.01% |
+183
| New | +$46.3K |
|
6110
KraneShares MSCI China Clean Technology Index ETF
KGRN
$54.8M
| $42K | ﹤0.01% |
1,477
+785
| +113% | +$22.9K |
|
6111
PUT
Standard BioTools
LAB
$340M
| $42K | ﹤0.01% |
21,600
+18,200
| +535% | +$36K |
|
6112
CALL
Lineage Cell Therapeutics
LCTX
$269M
| $42K | ﹤0.01% |
28,600
-9,000
| -24% | -$12.6K |
|
6113
CALL
Lindblad Expeditions
LIND
$1.94B
| $42K | ﹤0.01% |
4,400
+4,200
| +2,100% | +$42.2K |
|
6114
PUT
Lexicon Pharmaceuticals
LXRX
$1.03B
| $42K | ﹤0.01% |
17,400
+11,900
| +216% | +$27.3K |
|
6115
MGIC Investment
MTG
$6.16B
| $42K | ﹤0.01% |
3,150
+556
| +21% | +$7.49K |
|
6116
PUT
Performance Food Group
PFGC
$18B
| $42K | ﹤0.01% |
700
-2,700
| -79% | -$158K |
|
6117
CALL
RAVE Restaurant Group
RAVE
$44.8M
| $42K | ﹤0.01% |
29,300
+19,400
| +196% | +$30.9K |
|
6118
Southwest Gas
SWX
$6.47B
| $42K | ﹤0.01% |
673
+174
| +35% | +$11.1K |
|
6119
CALL
Tenable Holdings
TENB
$3.6B
| $42K | ﹤0.01% |
900
-16,600
| -95% | -$705K |
|
6120
CALL
Sixth Street Specialty
TSLX
$1.63B
| $42K | ﹤0.01% |
2,300
-3,500
| -60% | -$64.9K |
|
6121
PUT
United Natural Foods
UNFI
$3.08B
| $42K | ﹤0.01% |
1,600
-21,100
| -93% | -$769K |
|
|
ZH
6122
CALL
Zhihu
ZH
$281M
| $42K | ﹤0.01% |
5,533
-667
| -11% | -$6.18K |
|
|
SYNH
6123
CALL
DELISTED
Syneos Health, Inc. Class A Common Stock
SYNH
| $42K | ﹤0.01% |
1,200
+100
| +9% | +$3.63K |
|
6124
PUT
Adaptive Biotechnologies
ADPT
$3.59B
| $41K | ﹤0.01% |
4,700
+3,300
| +236% | +$29.1K |
|
6125
CALL
AudioEye
AEYE
$72.3M
| $41K | ﹤0.01% |
5,800
+5,300
| +1,060% | +$30.2K |
|
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.