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 | |
|---|---|---|---|---|---|---|
1126
CALL
Hilton Worldwide
HLT
$72.9B
| $9.39M | 0.01% |
51,600
-10,200
| -17% | -$1.66M |
|
1127
CALL
Healthcare Realty
HR
$7.33B
| $9.39M | 0.01% |
545,300
+525,500
| +2,654% | +$8.02M |
|
1128
Zillow
Z
$6.77B
| $9.39M | 0.01% |
+162,285
| New | +$7.15M |
|
1129
PUT
Carrier Global
CARR
$57.4B
| $9.39M | 0.01% |
163,400
-15,600
| -9% | -$825K |
|
1130
CALL
FIVE9
FIVN
$1.66B
| $9.38M | 0.01% |
119,200
+30,800
| +35% | +$2.14M |
|
1131
CALL
PPG Industries
PPG
$25.4B
| $9.38M | 0.01% |
62,700
+41,500
| +196% | +$5.62M |
|
1132
General Mills
GIS
$19B
| $9.38M | 0.01% |
143,935
-19,722
| -12% | -$1.27M |
|
|
HUT
1133
CALL
Hut 8
HUT
$13.2B
| $9.37M | 0.01% |
702,600
+539,940
| +332% | +$5.76M |
|
1134
PUT
argenx
ARGX
$57.8B
| $9.36M | 0.01% |
24,600
+12,000
| +95% | +$5.59M |
|
1135
CALL
Samsara
IOT
$18.3B
| $9.35M | 0.01% |
280,000
-21,500
| -7% | -$597K |
|
1136
CALL
Stellantis
STLA
$16.7B
| $9.34M | 0.01% |
400,400
+300
| +0.1% | +$6.2K |
|
|
PXD
1137
PUT
DELISTED
Pioneer Natural Resource Co.
PXD
| $9.33M | 0.01% |
41,500
-4,100
| -9% | -$961K |
|
1138
State Street Energy Select Sector SPDR ETF
XLE
$39.3B
| $9.32M | 0.01% |
+222,396
| New | +$9.51M |
|
1139
PUT
Colgate-Palmolive
CL
$72.1B
| $9.32M | 0.01% |
116,900
-437,500
| -79% | -$32.9M |
|
1140
PUT
Stanley Black & Decker
SWK
$13.6B
| $9.31M | 0.01% |
94,900
+34,200
| +56% | +$3.01M |
|
1141
PUT
AMC Entertainment Holdings
AMC
$2.04B
| $9.3M | 0.01% |
1,530,100
-602,100
| -28% | -$4.89M |
|
1142
PUT
American Electric Power
AEP
$73.4B
| $9.29M | 0.01% |
114,400
+53,600
| +88% | +$4.16M |
|
1143
CALL
KeyCorp
KEY
$24.4B
| $9.28M | 0.01% |
644,700
+191,600
| +42% | +$2.27M |
|
1144
PUT
Archer Daniels Midland
ADM
$41.6B
| $9.28M | 0.01% |
128,500
+59,600
| +87% | +$4.36M |
|
1145
CALL
Blackstone Mortgage Trust
BXMT
$2.78B
| $9.24M | 0.01% |
434,500
+110,800
| +34% | +$2.39M |
|
1146
CALL
DigitalOcean
DOCN
$15.3B
| $9.23M | 0.01% |
251,700
+44,100
| +21% | +$1.22M |
|
|
1147
PUT
Samsara
IOT
$18.3B
| $9.22M | 0.01% |
276,200
+26,100
| +10% | +$725K |
|
1148
CALL
Quanta Services
PWR
$98.1B
| $9.21M | 0.01% |
42,700
-10,300
| -19% | -$1.9M |
|
1149
PUT
Public Storage
PSA
$58.8B
| $9.21M | 0.01% |
30,200
+6,500
| +27% | +$1.72M |
|
1150
PUT
State Street
STT
$50.6B
| $9.12M | 0.01% |
117,700
+59,400
| +102% | +$4.14M |
|
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.