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 | |
|---|---|---|---|---|---|---|
4851
PUT
Quest Resource Holding
QRHC
$27.6M
| $130K | ﹤0.01% |
21,300
+7,600
| +55% | +$48.8K |
|
|
SOND
4852
DELISTED
Sonder
SOND
| $130K | ﹤0.01% |
8,632
+3,836
| +80% | +$89K |
|
4853
CALL
TMC The Metals Company
TMC
$1.49B
| $130K | ﹤0.01% |
157,700
-161,000
| -51% | -$150K |
|
4854
ProShares Ultra Semiconductors
USD
$2.13B
| $130K | ﹤0.01% |
+18,032
| New | +$104K |
|
|
FFAI
4855
PUT
Faraday Future Intelligent Electric
FFAI
$11.8M
| – | – |
0
| – | – |
|
4856
PUT
Carter's
CRI
$1.43B
| $129K | ﹤0.01% |
1,800
+1,300
| +260% | +$99.5K |
|
|
AGNT
4857
CALL
AGNT Inc
AGNT
$629M
| $129K | ﹤0.01% |
10,200
-10,200
| -50% | -$136K |
|
|
DMC
4858
CALL
Del Monte Corp
DMC
$1.42B
| $129K | ﹤0.01% |
4,300
-100
| -2% | -$2.9K |
|
|
OTLY
4859
PUT
Oatly Group
OTLY
$476M
| $129K | ﹤0.01% |
2,675
+2,190
| +452% | +$102K |
|
4860
Banco Santander
SAN
$191B
| $129K | ﹤0.01% |
35,195
-338,290
| -91% | -$1.2M |
|
4861
PUT
Tandem Diabetes Care
TNDM
$1.27B
| $129K | ﹤0.01% |
3,200
-9,200
| -74% | -$381K |
|
4862
Veritone
VERI
$92.9M
| $129K | ﹤0.01% |
22,236
+14,813
| +200% | +$102K |
|
|
VLRS
4863
CALL
Controladora Vuela Compania de Aviacion
VLRS
$869M
| $129K | ﹤0.01% |
+10,400
| New | +$115K |
|
|
EVA
4864
PUT
DELISTED
Enviva Inc.
EVA
| $129K | ﹤0.01% |
4,500
-1,700
| -27% | -$69.4K |
|
4865
PUT
Calix
CALX
$2.24B
| $128K | ﹤0.01% |
2,400
-2,800
| -54% | -$153K |
|
4866
EXL Service
EXLS
$5.46B
| $128K | ﹤0.01% |
3,960
+3,020
| +321% | +$100K |
|
4867
PUT
First American
FAF
$7.98B
| $128K | ﹤0.01% |
2,300
+1,400
| +156% | +$80.4K |
|
4868
CALL
Fidelity Corporate Bond ETF
FCOR
$353M
| $128K | ﹤0.01% |
2,800
+2,700
| +2,700% | +$124K |
|
4869
PUT
Heritage Insurance Holdings
HRTG
$903M
| $128K | ﹤0.01% |
+41,700
| New | +$109K |
|
|
JAMF
4870
CALL
DELISTED
Jamf
JAMF
| $128K | ﹤0.01% |
6,600
+4,600
| +230% | +$92.1K |
|
4871
Navitas Semiconductor
NVTS
$2.54B
| $128K | ﹤0.01% |
17,595
+11,851
| +206% | +$66.4K |
|
4872
PUT
Oscar Health
OSCR
$9.22B
| $128K | ﹤0.01% |
19,600
-4,300
| -18% | -$17.6K |
|
4873
PUT
Ultragenyx Pharmaceutical
RARE
$2.46B
| $128K | ﹤0.01% |
3,200
+2,100
| +191% | +$90.1K |
|
4874
Voyager Therapeutics
VYGR
$181M
| $128K | ﹤0.01% |
+16,623
| New | +$132K |
|
|
TGH
4875
PUT
DELISTED
Textainer Group Holdings limited
TGH
| $128K | ﹤0.01% |
4,000
+3,700
| +1,233% | +$121K |
|
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.