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 | |
|---|---|---|---|---|---|---|
6276
Beazer Homes USA
BZH
$877M
| $36K | ﹤0.01% |
+2,285
| New | +$33.9K |
|
6277
Casey's General Stores
CASY
$32.2B
| $36K | ﹤0.01% |
+168
| New | +$36.7K |
|
6278
PUT
Enanta Pharmaceuticals
ENTA
$366M
| $36K | ﹤0.01% |
900
+600
| +200% | +$28.7K |
|
6279
Enova International
ENVA
$6.33B
| $36K | ﹤0.01% |
+830
| New | +$37.6K |
|
6280
PUT
Empire State Realty Trust
ESRT
$872M
| $36K | ﹤0.01% |
5,600
+5,000
| +833% | +$36.6K |
|
6281
PUT
Extreme Networks
EXTR
$3.94B
| $36K | ﹤0.01% |
1,900
-19,200
| -91% | -$354K |
|
6282
PUT
Gold Royalty Corp
GROY
$600M
| $36K | ﹤0.01% |
16,800
-17,900
| -52% | -$41.1K |
|
6283
PUT
Fusion Fuel Green
HTOO
$18.7M
| $36K | ﹤0.01% |
429
-22
| -5% | -$2.75K |
|
6284
Ionis Pharmaceuticals
IONS
$8.6B
| $36K | ﹤0.01% |
1,019
-3,351
| -77% | -$126K |
|
6285
PUT
IPG Photonics
IPGP
$3.61B
| $36K | ﹤0.01% |
300
-100
| -25% | -$11.6K |
|
6286
CALL
Karyopharm Therapeutics
KPTI
$43.5M
| $36K | ﹤0.01% |
633
-774
| -55% | -$38.2K |
|
6287
PUT
Marcus Corp
MCS
$897M
| $36K | ﹤0.01% |
+2,300
| New | +$35.3K |
|
|
MVO
6288
PUT
DELISTED
MV Oil Trust
MVO
| $36K | ﹤0.01% |
3,100
+2,300
| +288% | +$30.5K |
|
6289
NovaGold Resources
NG
$2.56B
| $36K | ﹤0.01% |
5,875
-4,903
| -45% | -$29.8K |
|
6290
PUT
New Mountain Finance
NMFC
$651M
| $36K | ﹤0.01% |
3,000
+700
| +30% | +$8.81K |
|
6291
Nano X Imaging
NNOX
$68.2M
| $36K | ﹤0.01% |
6,300
-41,423
| -87% | -$317K |
|
6292
ProShares S&P 500 Dividend Aristocrats ETF
NOBL
$11.7B
| $36K | ﹤0.01% |
792
-1,970
| -71% | -$89.6K |
|
6293
PUT
RCM Technologies
RCMT
$201M
| $36K | ﹤0.01% |
3,200
+3,100
| +3,100% | +$40.8K |
|
6294
Reinsurance Group of America
RGA
$15.5B
| $36K | ﹤0.01% |
+274
| New | +$38.8K |
|
6295
Rocket Companies
RKT
$36.5B
| $36K | ﹤0.01% |
4,000
| – | – |
|
6296
SI-BONE Inc
SIBN
$788M
| $36K | ﹤0.01% |
1,839
-5,920
| -76% | -$105K |
|
6297
PUT
Smart Sand
SND
$185M
| $36K | ﹤0.01% |
20,700
-5,800
| -22% | -$10.8K |
|
6298
PUT
Sensus Healthcare
SRTS
$47.9M
| $36K | ﹤0.01% |
+7,000
| New | +$50.3K |
|
6299
PUT
Sasol
SSL
$7.5B
| $36K | ﹤0.01% |
2,700
+1,100
| +69% | +$17.1K |
|
6300
CALL
Supernus Pharmaceuticals
SUPN
$2.59B
| $36K | ﹤0.01% |
1,000
-1,700
| -63% | -$65.4K |
|
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.