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 | |
|---|---|---|---|---|---|---|
4026
CALL
McEwen Inc
MUX
$1.03B
| $364K | ﹤0.01% |
70,600
+33,000
| +88% | +$239K |
|
4027
PUT
Portillo's
PTLO
$339M
| $364K | ﹤0.01% |
22,900
+11,300
| +97% | +$175K |
|
4028
PUT
CNA Financial
CNA
$15B
| $363K | ﹤0.01% |
8,600
+500
| +6% | +$20.4K |
|
|
LTHM
4029
CALL
DELISTED
Livent Corporation
LTHM
| $363K | ﹤0.01% |
257,900
+119,300
| +86% | +$1.86M |
|
4030
PUT
American Conservative Values ETF
ACVF
$150M
| $362K | ﹤0.01% |
+14,600
| New | +$499K |
|
|
IPG
4031
PUT
DELISTED
Interpublic Group of Companies
IPG
| $362K | ﹤0.01% |
11,100
+2,800
| +34% | +$84.3K |
|
4032
PUT
Manulife Financial
MFC
$74.2B
| $362K | ﹤0.01% |
16,400
+8,700
| +113% | +$167K |
|
4033
Archer Aviation
ACHR
$3.68B
| $361K | ﹤0.01% |
+58,804
| New | +$334K |
|
4034
Cenovus Energy
CVE
$51.6B
| $361K | ﹤0.01% |
21,722
-62,519
| -74% | -$1.14M |
|
4035
CALL
Harmony Biosciences
HRMY
$2.07B
| $361K | ﹤0.01% |
11,200
+6,200
| +124% | +$173K |
|
|
VRN
4036
PUT
DELISTED
Veren
VRN
| $361K | ﹤0.01% |
52,100
+12,500
| +32% | +$92.2K |
|
|
TSVT
4037
PUT
DELISTED
2seventy bio
TSVT
| $360K | ﹤0.01% |
84,500
+84,100
| +21,025% | +$259K |
|
|
ONC
4038
PUT
BeOne Medicines Ltd
ONC
$34.3B
| $360K | ﹤0.01% |
2,000
-1,300
| -39% | -$235K |
|
|
AXNX
4039
PUT
DELISTED
Axonics, Inc. Common Stock
AXNX
| $360K | ﹤0.01% |
5,800
+5,700
| +5,700% | +$319K |
|
4040
PUT
Lennox International
LII
$18.9B
| $358K | ﹤0.01% |
800
+700
| +700% | +$279K |
|
4041
Intellia Therapeutics
NTLA
$1.52B
| $358K | ﹤0.01% |
+11,751
| New | +$338K |
|
4042
PUT
Revolution Medicines
RVMD
$39.1B
| $358K | ﹤0.01% |
12,500
-500
| -4% | -$12K |
|
4043
CALL
Metallus
MTUS
$879M
| $358K | ﹤0.01% |
15,300
+13,900
| +993% | +$292K |
|
4044
Armstrong World Industries
AWI
$7.55B
| $357K | ﹤0.01% |
3,633
+3,599
| +10,585% | +$298K |
|
4045
CALL
American Financial Group
AFG
$12B
| $356K | ﹤0.01% |
3,000
-200
| -6% | -$22.5K |
|
4046
AeroVironment
AVAV
$7.91B
| $356K | ﹤0.01% |
+2,829
| New | +$346K |
|
4047
PUT
Huntsman Corp
HUN
$2B
| $356K | ﹤0.01% |
14,200
-54,000
| -79% | -$1.31M |
|
4048
CALL
OFG Bancorp
OFG
$2.24B
| $356K | ﹤0.01% |
9,500
-11,100
| -54% | -$366K |
|
4049
CALL
Pricesmart
PSMT
$5.9B
| $356K | ﹤0.01% |
4,700
+4,200
| +840% | +$298K |
|
|
DADA
4050
PUT
DELISTED
Dada Nexus
DADA
| $355K | ﹤0.01% |
107,000
+21,400
| +25% | +$79K |
|
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.