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 | |
|---|---|---|---|---|---|---|
|
CDTX
6701
DELISTED
Cidara Therapeutics
CDTX
| $24K | ﹤0.01% |
+978
| New | +$27.8K |
|
|
CGAU
6702
PUT
Centerra Gold
CGAU
$3.58B
| $24K | ﹤0.01% |
3,800
+2,900
| +322% | +$18.1K |
|
6703
Compass
COMP
$8.56B
| $24K | ﹤0.01% |
+7,739
| New | +$26.5K |
|
6704
CALL
Citi Trends
CTRN
$565M
| $24K | ﹤0.01% |
1,300
-5,000
| -79% | -$137K |
|
6705
PUT
Designer Brands
DBI
$314M
| $24K | ﹤0.01% |
2,800
-2,000
| -42% | -$19.2K |
|
|
DENN
6706
CALL
DELISTED
Denny's
DENN
| $24K | ﹤0.01% |
2,200
-11,300
| -84% | -$131K |
|
6707
CALL
Dynagas LNG Partners
DLNG
$134M
| $24K | ﹤0.01% |
8,700
+400
| +5% | +$1.18K |
|
6708
PUT
Healthpeak Properties
DOC
$15.2B
| $24K | ﹤0.01% |
1,100
-4,900
| -82% | -$122K |
|
|
DOG
6709
ProShares Short Dow30
DOG
$110M
| $24K | ﹤0.01% |
+729
| New | +$24.3K |
|
6710
PUT
Essent Group
ESNT
$6.12B
| $24K | ﹤0.01% |
600
-13,400
| -96% | -$552K |
|
6711
CALL
First Trust Morningstar Dividend Leaders Index Fund
FDL
$7.74B
| $24K | ﹤0.01% |
+700
| New | +$25.6K |
|
6712
Fathom Holdings
FTHM
$26.3M
| $24K | ﹤0.01% |
+5,802
| New | +$29.9K |
|
6713
StealthGas
GASS
$329M
| $24K | ﹤0.01% |
9,415
+5,359
| +132% | +$14.8K |
|
6714
PUT
Howard Hughes
HHH
$3.87B
| $24K | ﹤0.01% |
315
-6,608
| -95% | -$514K |
|
6715
PUT
International General Insurance
IGIC
$1.18B
| $24K | ﹤0.01% |
3,000
-100
| -3% | -$827 |
|
6716
PUT
Invivyd
IVVD
$171M
| $24K | ﹤0.01% |
+20,000
| New | +$36.5K |
|
6717
CALL
Jasper Therapeutics
JSPR
$20.7M
| $24K | ﹤0.01% |
+1,340
| New | +$24.8K |
|
6718
PUT
Kodak
KODK
$819M
| $24K | ﹤0.01% |
6,000
-4,800
| -44% | -$17.3K |
|
|
DFTX
6719
PUT
Definium Therapeutics
DFTX
$5.91B
| $24K | ﹤0.01% |
7,700
-365,600
| -98% | -$1.22M |
|
6720
PUT
Newegg Commerce
NEGG
$270M
| $24K | ﹤0.01% |
910
+75
| +9% | +$2.34K |
|
6721
Quest Resource Holding
QRHC
$27.8M
| $24K | ﹤0.01% |
4,061
-5,561
| -58% | -$35.7K |
|
6722
CALL
Q2 Holdings
QTWO
$3.7B
| $24K | ﹤0.01% |
1,000
+400
| +67% | +$11.9K |
|
6723
CALL
FreightCar America
RAIL
$261M
| $24K | ﹤0.01% |
7,900
+1,300
| +20% | +$4.5K |
|
6724
CALL
SGHC Ltd
SGHC
$7.15B
| $24K | ﹤0.01% |
6,200
+700
| +13% | +$2.53K |
|
6725
PUT
Snap-on
SNA
$21.2B
| $24K | ﹤0.01% |
+100
| New | +$24.4K |
|
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.