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 | |
|---|---|---|---|---|---|---|
1051
PUT
HSBC
HSBC
$349B
| $10.5M | 0.01% |
259,900
-35,700
| -12% | -$1.38M |
|
1052
Canadian Solar
CSIQ
$997M
| $10.5M | 0.01% |
401,444
+254,218
| +173% | +$5.61M |
|
1053
United Airlines
UAL
$37.4B
| $10.5M | 0.01% |
254,171
+230,768
| +986% | +$9.07M |
|
|
SPR
1054
CALL
DELISTED
Spirit AeroSystems
SPR
| $10.5M | 0.01% |
329,600
+210,300
| +176% | +$5.16M |
|
1055
CALL
Elastic
ESTC
$5.96B
| $10.5M | 0.01% |
92,900
+38,200
| +70% | +$3.4M |
|
1056
PUT
Ralph Lauren
RL
$22.1B
| $10.5M | 0.01% |
72,600
+23,500
| +48% | +$2.91M |
|
1057
PUT
BioNTech
BNTX
$23.3B
| $10.5M | 0.01% |
99,100
-57,700
| -37% | -$5.81M |
|
1058
PUT
Oneok
OKE
$58.7B
| $10.4M | 0.01% |
148,600
-75,000
| -34% | -$5.03M |
|
1059
CALL
monday.com
MNDY
$3.03B
| $10.4M | 0.01% |
55,300
+19,900
| +56% | +$3.2M |
|
1060
CALL
Copart
CPRT
$25.2B
| $10.4M | 0.01% |
211,900
+136,300
| +180% | +$6.44M |
|
1061
CALL
Unilever
UL
$130B
| $10.4M | 0.01% |
190,311
-10,756
| -5% | -$580K |
|
1062
PUT
Lamb Weston
LW
$6.79B
| $10.4M | 0.01% |
96,000
+17,700
| +23% | +$1.7M |
|
|
EXAS
1063
PUT
DELISTED
Exact Sciences
EXAS
| $10.4M | 0.01% |
140,100
+98,400
| +236% | +$6.45M |
|
1064
Constellation Brands
STZ
$22.1B
| $10.4M | 0.01% |
42,827
+11,602
| +37% | +$2.76M |
|
1065
Apple
AAPL
$4.72T
| $10.4M | 0.01% |
53,768
-245,491
| -82% | -$45.3M |
|
1066
CALL
Monster Beverage
MNST
$91.5B
| $10.3M | 0.01% |
179,100
+74,000
| +70% | +$3.95M |
|
|
NOVA
1067
PUT
DELISTED
Sunnova Energy
NOVA
| $10.3M | 0.01% |
674,400
+427,400
| +173% | +$4.68M |
|
1068
PUT
Arthur J. Gallagher & Co
AJG
$62.2B
| $10.3M | 0.01% |
45,700
+39,900
| +688% | +$9.45M |
|
1069
PUT
Camping World
CWH
$358M
| $10.3M | 0.01% |
391,300
+201,800
| +106% | +$4.23M |
|
1070
CALL
Ovintiv
OVV
$17.3B
| $10.3M | 0.01% |
233,800
+9,700
| +4% | +$443K |
|
|
BNY
1071
CALL
Bank of New York Mellon
BNY
$109B
| $10.2M | 0.01% |
196,900
+109,300
| +125% | +$5.03M |
|
1072
CALL
ZIM Integrated Shipping Services
ZIM
$3.08B
| $10.2M | 0.01% |
1,036,600
+572,400
| +123% | +$4.81M |
|
1073
PUT
Ball Corp
BALL
$16.6B
| $10.2M | 0.01% |
177,700
+163,400
| +1,143% | +$8.43M |
|
1074
CALL
PACCAR
PCAR
$68.8B
| $10.2M | 0.01% |
104,400
+9,600
| +10% | +$862K |
|
1075
PUT
Dropbox
DBX
$6.63B
| $10.2M | 0.01% |
345,100
+88,800
| +35% | +$2.47M |
|
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.