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 |
Alibaba
BABA
|
+$120M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$93.9M |
| 3 |
Walt Disney
DIS
|
+$71.7M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$41.7M |
| 5 |
Citigroup
C
|
+$39.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$136M |
| 2 |
Amazon
AMZN
|
+$118M |
| 3 |
SPDR Gold Trust
GLD
|
+$56.2M |
| 4 |
Microsoft
MSFT
|
+$52.4M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$45.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.33% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Communication Services | 0.21% |
| 4 | Financials | 0.19% |
| 5 | Healthcare | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
7176
Inseego
INSG
$112M
| $14K | ﹤0.01% |
6,750
+1,687
| +33% | +$5.08K |
|
7177
PUT
Inter&Co
INTR
$2.45B
| $14K | ﹤0.01% |
+2,600
| New | +$12.6K |
|
7178
CALL
Interparfums
IPAR
$3.96B
| $14K | ﹤0.01% |
100
-800
| -89% | -$104K |
|
7179
PUT
The Joint Corp
JYNT
$122M
| $14K | ﹤0.01% |
+1,500
| New | +$13K |
|
7180
KraneShares Global Carbon Strategy ETF
KRBN
$139M
| $14K | ﹤0.01% |
402
-1,806
| -82% | -$64.7K |
|
7181
PUT
loanDepot
LDI
$553M
| $14K | ﹤0.01% |
4,000
+1,700
| +74% | +$3.2K |
|
7182
CALL
Liberty Latin America Class C
LILAK
$1.54B
| $14K | ﹤0.01% |
2,200
-32,120
| -94% | -$208K |
|
7183
Mayville Engineering Co
MEC
$744M
| $14K | ﹤0.01% |
1,016
-678
| -40% | -$8.41K |
|
7184
Mizuho Financial
MFG
$127B
| $14K | ﹤0.01% |
+4,219
| New | +$14.3K |
|
7185
CALL
Mueller Water Products
MWA
$3.91B
| $14K | ﹤0.01% |
+1,000
| New | +$13.2K |
|
7186
PUT
MYR Group
MYRG
$5.58B
| $14K | ﹤0.01% |
+100
| New | +$12.9K |
|
|
NOA
7187
North American Construction
NOA
$374M
| $14K | ﹤0.01% |
+708
| New | +$14.6K |
|
7188
PUT
Envista
NVST
$4.33B
| $14K | ﹤0.01% |
600
-4,000
| -87% | -$95.6K |
|
|
ADAM
7189
CALL
Adamas Trust
ADAM
$789M
| $14K | ﹤0.01% |
7,900
-1,800
| -19% | -$15.2K |
|
|
ODV
7190
DELISTED
Osisko Development Corp
ODV
| $14K | ﹤0.01% |
4,921
-6,423
| -57% | -$19.4K |
|
7191
Parke Bancorp
PKBK
$389M
| $14K | ﹤0.01% |
706
+226
| +47% | +$4K |
|
7192
CALL
Park Aerospace
PKE
$773M
| $14K | ﹤0.01% |
+1,000
| New | +$15K |
|
|
PRPH
7193
DELISTED
ProPhase Labs
PRPH
| $14K | ﹤0.01% |
329
+10
| +3% | +$456 |
|
|
RENT
7194
CALL
Rent the Runway
RENT
$108M
| $14K | ﹤0.01% |
1,330
-200
| -13% | -$2.47K |
|
|
RENT
7195
PUT
Rent the Runway
RENT
$108M
| $14K | ﹤0.01% |
1,400
-455
| -25% | -$5.62K |
|
|
SEM
7196
PUT
DELISTED
Select Medical
SEM
| $14K | ﹤0.01% |
+1,114
| New | +$14.1K |
|
7197
Spire
SR
$4.89B
| $14K | ﹤0.01% |
229
+68
| +42% | +$4.06K |
|
|
STR
7198
DELISTED
Sitio Royalties
STR
| $14K | ﹤0.01% |
+614
| New | +$14.3K |
|
|
SUPV
7199
PUT
Grupo Supervielle
SUPV
$853M
| $14K | ﹤0.01% |
3,500
-48,200
| -93% | -$132K |
|
7200
Savara
SVRA
$1.13B
| $14K | ﹤0.01% |
+2,996
| New | +$11.5K |
|
Similar funds
Simplex Trading's Q4 2023 Portfolio in Review
As of Q4 2023, Simplex Trading held 10,333 positions worth $156B, up 23% from $127B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading deployed $15.1B of net new capital in Q4 2023, opening 1,639 new positions and adding to 3,920 existing holdings. Its largest new stake was Walt Disney: 812,984 shares worth $73.4M.
By sector, the portfolio is most concentrated in Technology at 0.33% of assets, down from 0.44% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was iShares 20+ Year Treasury Bond ETF, an estimated $136M trimmed.
- Simplex Trading's largest Q4 2023 buy was Walt Disney: 812,984 shares worth $73.4M.
- Simplex Trading added most to Alibaba in Q4 2023, an estimated $120M increase.
- Simplex Trading's biggest Q4 2023 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $136M.
- Simplex Trading fully exited Amazon in Q4 2023, selling an estimated $118M.
- Simplex Trading's ten largest holdings make up 42% of its $156B portfolio in Q4 2023.
- Simplex Trading opened 1,639 new positions and closed 1,508 in Q4 2023.
- Simplex Trading's portfolio value rose 23% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q4 2023, filed 2 Feb 2024.