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 | |
|---|---|---|---|---|---|---|
2051
CALL
Plains All American Pipeline
PAA
$17.4B
| $2.88M | ﹤0.01% |
189,800
-29,900
| -14% | -$457K |
|
|
TGI
2052
PUT
DELISTED
Triumph Group
TGI
| $2.87M | ﹤0.01% |
+173,400
| New | +$1.76M |
|
2053
PUT
Cognex
CGNX
$10.3B
| $2.87M | ﹤0.01% |
68,700
+53,700
| +358% | +$2.06M |
|
2054
CALL
SBA Communications
SBAC
$18.4B
| $2.87M | ﹤0.01% |
11,300
+10,100
| +842% | +$2.27M |
|
2055
CALL
Kinross Gold
KGC
$28.5B
| $2.86M | ﹤0.01% |
473,100
+48,900
| +12% | +$267K |
|
|
LAZR
2056
CALL
DELISTED
Luminar Technologies
LAZR
| $2.84M | ﹤0.01% |
56,240
+5,787
| +11% | +$288K |
|
2057
PUT
Century Aluminum
CENX
$4.57B
| $2.84M | ﹤0.01% |
233,900
+174,000
| +290% | +$1.37M |
|
2058
PUT
Iovance Biotherapeutics
IOVA
$2.23B
| $2.83M | ﹤0.01% |
348,700
+56,700
| +19% | +$297K |
|
|
CBL
2059
CALL
DELISTED
CBL& Associates Properties, Inc.
CBL
| $2.83M | ﹤0.01% |
116,000
+13,200
| +13% | +$322K |
|
2060
PUT
Target Hospitality
TH
$1.61B
| $2.83M | ﹤0.01% |
291,000
-378,000
| -57% | -$4.68M |
|
2061
CALL
Sphere Entertainment
SPHR
$4.88B
| $2.83M | ﹤0.01% |
83,300
+15,300
| +23% | +$532K |
|
2062
CALL
Scotiabank
BNS
$106B
| $2.82M | ﹤0.01% |
58,000
+17,300
| +43% | +$762K |
|
2063
PUT
Opendoor
OPEN
$3.69B
| $2.82M | ﹤0.01% |
651,517
+129,890
| +25% | +$363K |
|
2064
CALL
Xcel Energy
XEL
$51B
| $2.82M | ﹤0.01% |
45,500
-22,200
| -33% | -$1.33M |
|
2065
PUT
Diageo
DEO
$46.2B
| $2.81M | ﹤0.01% |
19,300
-12,200
| -39% | -$1.8M |
|
2066
CALL
Vanguard Dividend Appreciation ETF
VIG
$111B
| $2.81M | ﹤0.01% |
16,500
+7,700
| +88% | +$1.24M |
|
|
JKS
2067
PUT
JinkoSolar
JKS
$775M
| $2.81M | ﹤0.01% |
76,000
+3,900
| +5% | +$126K |
|
2068
CALL
Grab
GRAB
$13.5B
| $2.81M | ﹤0.01% |
832,800
+335,300
| +67% | +$1.08M |
|
2069
PUT
Glaukos
GKOS
$9.02B
| $2.81M | ﹤0.01% |
35,300
+23,100
| +189% | +$1.58M |
|
2070
CALL
Liberty Global Class C
LBTYK
$3.27B
| $2.8M | ﹤0.01% |
157,600
+18,800
| +14% | +$326K |
|
2071
CALL
Labcorp
LH
$24.3B
| $2.8M | ﹤0.01% |
17,600
+6,600
| +60% | +$1.39M |
|
2072
Ferguson
FERG
$44.7B
| $2.79M | ﹤0.01% |
14,452
+13,838
| +2,254% | +$2.33M |
|
2073
UGI
UGI
$8B
| $2.79M | ﹤0.01% |
113,371
+13,173
| +13% | +$291K |
|
2074
PUT
Exelon
EXC
$48.6B
| $2.79M | ﹤0.01% |
77,600
+64,300
| +483% | +$2.48M |
|
2075
US Bancorp
USB
$99.6B
| $2.78M | ﹤0.01% |
64,345
-2,987
| -4% | -$109K |
|
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.