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 | |
|---|---|---|---|---|---|---|
8701
CALL
CS Disco
LAW
$226M
| $1K | ﹤0.01% |
300
-38,400
| -99% | -$273K |
|
|
LGO
8702
Largo
LGO
$62.8M
| $1K | ﹤0.01% |
+322
| New | +$1.91K |
|
8703
CALL
Comstock
LODE
$228M
| $1K | ﹤0.01% |
400
-570
| -59% | -$2.24K |
|
8704
LG Display
LPL
$3.17B
| $1K | ﹤0.01% |
+231
| New | +$1.31K |
|
|
SEGG
8705
Sports Entertainment Gaming Global Corp
SEGG
$14.4M
| $1K | ﹤0.01% |
21
-42
| -67% | -$3.61K |
|
8706
PUT
LiveWire
LVWR
$299M
| $1K | ﹤0.01% |
300
-1,800
| -86% | -$11.6K |
|
8707
CALL
MiMedx Group
MDXG
$626M
| $1K | ﹤0.01% |
300
-14,200
| -98% | -$55K |
|
8708
CALL
Mizuho Financial
MFG
$129B
| $1K | ﹤0.01% |
500
-1,700
| -77% | -$5.2K |
|
8709
PUT
Mitek Systems
MITK
$762M
| $1K | ﹤0.01% |
200
-3,000
| -94% | -$28.8K |
|
|
MPX
8710
PUT
DELISTED
Marine Products Corp
MPX
| $1K | ﹤0.01% |
100
-100
| -50% | -$1.3K |
|
|
MRC
8711
CALL
DELISTED
MRC Global
MRC
| $1K | ﹤0.01% |
200
-200
| -50% | -$2.27K |
|
8712
Midland States Bancorp
MSBI
$669M
| $1K | ﹤0.01% |
+85
| New | +$2.14K |
|
8713
PUT
Mueller Water Products
MWA
$3.92B
| $1K | ﹤0.01% |
+100
| New | +$1.3K |
|
8714
CALL
MaxCyte
MXCT
$116M
| $1K | ﹤0.01% |
+400
| New | +$1.97K |
|
8715
PUT
PLAYSTUDIOS Inc
MYPS
$79.3M
| $1K | ﹤0.01% |
+300
| New | +$1.22K |
|
8716
PUT
Nature's Sunshine
NATR
$359M
| $1K | ﹤0.01% |
+100
| New | +$983 |
|
|
NFBK
8717
CALL
DELISTED
Northfield Bancorp
NFBK
| $1K | ﹤0.01% |
+100
| New | +$1.43K |
|
8718
PUT
NovaGold Resources
NG
$2.6B
| $1K | ﹤0.01% |
+200
| New | +$1.22K |
|
8719
PUT
NN Inc
NNBR
$272M
| $1K | ﹤0.01% |
1,200
| – | – |
|
|
NOAH
8720
CALL
Noah Holdings
NOAH
$588M
| $1K | ﹤0.01% |
100
-6,000
| -98% | -$111K |
|
8721
PUT
Nomad Foods
NOMD
$1.64B
| $1K | ﹤0.01% |
+100
| New | +$1.76K |
|
8722
NETSCOUT
NTCT
$2.86B
| $1K | ﹤0.01% |
52
+50
| +2,500% | +$1.5K |
|
|
NVX
8723
NOVONIX
NVX
$102M
| $1K | ﹤0.01% |
+347
| New | +$1.52K |
|
8724
NWPX Infrastructure Inc
NWPX
$1.25B
| $1K | ﹤0.01% |
41
-465
| -92% | -$16.8K |
|
8725
PUT
Ocugen
OCGN
$410M
| $1K | ﹤0.01% |
1,400
-7,000
| -83% | -$7.63K |
|
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.