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 | |
|---|---|---|---|---|---|---|
5551
CALL
8x8 Inc
EGHT
$269M
| $69K | ﹤0.01% |
16,600
+4,300
| +35% | +$21.5K |
|
|
FRGE
5552
CALL
DELISTED
Forge Global Holdings
FRGE
| $69K | ﹤0.01% |
2,633
+333
| +14% | +$9.04K |
|
|
TDAY
5553
CALL
USA Today Co
TDAY
$1.27B
| $69K | ﹤0.01% |
37,300
-14,400
| -28% | -$33.7K |
|
5554
CALL
Insteel Industries
IIIN
$593M
| $69K | ﹤0.01% |
2,500
-29,200
| -92% | -$849K |
|
5555
CALL
Immatics
IMTX
$1.18B
| $69K | ﹤0.01% |
10,000
+200
| +2% | +$1.64K |
|
5556
CALL
Dorian LPG
LPG
$2.03B
| $69K | ﹤0.01% |
3,500
-100
| -3% | -$2.03K |
|
5557
CALL
Moelis & Co
MC
$4.97B
| $69K | ﹤0.01% |
1,800
-3,400
| -65% | -$146K |
|
5558
Mitek Systems
MITK
$754M
| $69K | ﹤0.01% |
7,195
+4,212
| +141% | +$40.4K |
|
5559
CALL
Movado Group
MOV
$849M
| $69K | ﹤0.01% |
2,400
+2,000
| +500% | +$67.8K |
|
5560
CALL
Myriad Genetics
MYGN
$270M
| $69K | ﹤0.01% |
+3,000
| New | +$60.9K |
|
5561
CALL
PubMatic
PUBM
$585M
| $69K | ﹤0.01% |
5,000
-17,500
| -78% | -$253K |
|
5562
CALL
Revolution Medicines
RVMD
$39.9B
| $69K | ﹤0.01% |
+3,200
| New | +$78.8K |
|
5563
State Street SPDR Portfolio Developed World ex-US ETF
SPDW
$40.2B
| $69K | ﹤0.01% |
+2,161
| New | +$68.2K |
|
5564
PUT
Tronox
TROX
$932M
| $69K | ﹤0.01% |
4,800
-9,700
| -67% | -$150K |
|
|
PWSC
5565
CALL
DELISTED
PowerSchool Holdings, Inc.
PWSC
| $69K | ﹤0.01% |
3,500
+3,400
| +3,400% | +$74.4K |
|
|
CONX
5566
PUT
DELISTED
CONX Corp. Class A Common Stock
CONX
| $69K | ﹤0.01% |
6,800
-4,100
| -38% | -$41.4K |
|
5567
PUT
AdaptHealth
AHCO
$1.47B
| $68K | ﹤0.01% |
5,500
-500
| -8% | -$9.2K |
|
5568
CALL
BioCardia
BCDA
$12.3M
| $68K | ﹤0.01% |
2,353
-1,127
| -32% | -$37.4K |
|
5569
Breakwave Dry Bulk Shipping ETF
BDRY
$29.5M
| $68K | ﹤0.01% |
6,765
+5,865
| +652% | +$51K |
|
5570
Huron Consulting
HURN
$2.41B
| $68K | ﹤0.01% |
+854
| New | +$62K |
|
5571
Immunocore
IMCR
$1.72B
| $68K | ﹤0.01% |
+1,394
| New | +$78.4K |
|
5572
CALL
Recursion Pharmaceuticals
RXRX
$1.59B
| $68K | ﹤0.01% |
10,200
+9,900
| +3,300% | +$78.5K |
|
|
CZOO
5573
PUT
DELISTED
Cazoo Group Ltd
CZOO
| $68K | ﹤0.01% |
277
+272
| +5,440% | +$88.6K |
|
|
RTL
5574
CALL
DELISTED
The Necessity Retail REIT, Inc. Class A Common Stock
RTL
| $68K | ﹤0.01% |
10,900
-1,500
| -12% | -$9.73K |
|
|
ARVL
5575
CALL
DELISTED
Arrival Ordinary Shares
ARVL
| $68K | ﹤0.01% |
10,242
+1,054
| +11% | +$15.5K |
|
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.