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 | |
|---|---|---|---|---|---|---|
2101
CALL
Clear Secure
YOU
$5.26B
| $2.72M | ﹤0.01% |
131,600
+17,000
| +15% | +$330K |
|
2102
PUT
Amphenol
APH
$188B
| $2.72M | ﹤0.01% |
54,800
+17,600
| +47% | +$777K |
|
2103
PUT
Mattel
MAT
$4.17B
| $2.71M | ﹤0.01% |
143,800
+91,500
| +175% | +$1.78M |
|
2104
CALL
Vodafone
VOD
$34.9B
| $2.71M | ﹤0.01% |
311,500
-74,300
| -19% | -$679K |
|
2105
CALL
Ollie's Bargain Outlet
OLLI
$4.01B
| $2.71M | ﹤0.01% |
35,700
+6,500
| +22% | +$490K |
|
2106
CALL
Dover
DOV
$27.2B
| $2.71M | ﹤0.01% |
17,600
+13,400
| +319% | +$1.88M |
|
2107
PUT
Willis Towers Watson
WTW
$27.9B
| $2.7M | ﹤0.01% |
11,200
+800
| +8% | +$185K |
|
2108
PUT
Impinj
PI
$3.89B
| $2.7M | ﹤0.01% |
30,000
+700
| +2% | +$50.2K |
|
|
ABK
2109
CALL
DELISTED
Ambac Financial Group
ABK
| $2.7M | ﹤0.01% |
163,700
+153,500
| +1,505% | +$2.53M |
|
|
APLS
2110
DELISTED
Apellis Pharmaceuticals
APLS
| $2.69M | ﹤0.01% |
44,954
-31,911
| -42% | -$1.62M |
|
2111
State Street SPDR S&P Homebuilders ETF
XHB
$1.74B
| $2.69M | ﹤0.01% |
+28,129
| New | +$2.29M |
|
2112
CALL
Winnebago Industries
WGO
$870M
| $2.69M | ﹤0.01% |
36,900
+7,900
| +27% | +$507K |
|
2113
PUT
Jefferies Financial Group
JEF
$12.9B
| $2.69M | ﹤0.01% |
67,400
+49,200
| +270% | +$1.74M |
|
2114
Mobileye
MBLY
$2.03B
| $2.69M | ﹤0.01% |
+62,026
| New | +$2.44M |
|
2115
Galicia Financial Group
GGAL
$7.92B
| $2.68M | ﹤0.01% |
155,337
+66,594
| +75% | +$944K |
|
2116
PUT
Icahn Enterprises
IEP
$5.17B
| $2.68M | ﹤0.01% |
155,900
+20,600
| +15% | +$360K |
|
2117
CALL
Nextpower Inc
NXT
$15.2B
| $2.68M | ﹤0.01% |
57,200
+14,300
| +33% | +$560K |
|
|
EMBJ
2118
PUT
Embraer S.A. ADS
EMBJ
$11.6B
| $2.68M | ﹤0.01% |
145,200
+700
| +0.5% | +$11.2K |
|
2119
CALL
Hertz
HTZ
$572M
| $2.68M | ﹤0.01% |
257,800
-13,500
| -5% | -$130K |
|
2120
CALL
NewMarket
NEU
$7.17B
| $2.67M | ﹤0.01% |
+4,900
| New | +$2.46M |
|
2121
MP Materials
MP
$7.35B
| $2.67M | ﹤0.01% |
134,546
+51,527
| +62% | +$879K |
|
2122
PUT
Wendy's
WEN
$1.33B
| $2.67M | ﹤0.01% |
137,100
+41,300
| +43% | +$795K |
|
2123
PUT
Ingersoll Rand
IR
$33B
| $2.66M | ﹤0.01% |
34,400
+19,200
| +126% | +$1.31M |
|
2124
CALL
Ecolab
ECL
$75.6B
| $2.66M | ﹤0.01% |
13,400
-29,800
| -69% | -$5.36M |
|
2125
CALL
Performance Food Group
PFGC
$17.5B
| $2.65M | ﹤0.01% |
38,400
+20,000
| +109% | +$1.23M |
|
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.