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 | |
|---|---|---|---|---|---|---|
101
PUT
Caterpillar
CAT
$410B
| $157M | 0.1% |
531,900
+65,800
| +14% | +$17.1M |
|
102
PUT
Carvana
CVNA
$47B
| $152M | 0.1% |
14,361,500
+3,104,000
| +28% | +$23.2M |
|
103
PUT
Home Depot
HD
$331B
| $152M | 0.1% |
438,500
+2,800
| +0.6% | +$867K |
|
104
CALL
Freeport-McMoran
FCX
$89.9B
| $151M | 0.1% |
3,541,500
+1,227,100
| +53% | +$45.3M |
|
105
PUT
Shopify
SHOP
$160B
| $151M | 0.1% |
1,933,200
+264,500
| +16% | +$16.9M |
|
106
PUT
Royal Caribbean
RCL
$77.2B
| $149M | 0.1% |
1,147,600
-167,700
| -13% | -$17.1M |
|
107
PUT
ServiceNow
NOW
$105B
| $147M | 0.09% |
1,043,500
+137,000
| +15% | +$17.3M |
|
108
PUT
Chipotle Mexican Grill
CMG
$42.7B
| $146M | 0.09% |
3,190,000
+1,075,000
| +51% | +$44.7M |
|
109
CALL
Berkshire Hathaway Class B
BRK.B
$1.06T
| $145M | 0.09% |
576,800
+16,200
| +3% | +$5.69M |
|
110
PUT
Pfizer
PFE
$142B
| $145M | 0.09% |
5,046,300
+2,204,800
| +78% | +$66.7M |
|
111
CALL
State Street SPDR Portfolio Short Term Treasury ETF
SPTS
$6.07B
| $144M | 0.09% |
1,092,600
+86,400
| +9% | +$2.49M |
|
112
PUT
Snowflake
SNOW
$94.2B
| $143M | 0.09% |
718,100
-28,300
| -4% | -$4.78M |
|
113
CALL
Occidental Petroleum
OXY
$56.2B
| $143M | 0.09% |
2,392,700
+1,095,100
| +84% | +$66.8M |
|
114
PUT
Visa
V
$677B
| $143M | 0.09% |
547,500
+41,300
| +8% | +$10.2M |
|
115
CALL
Target
TGT
$63.4B
| $142M | 0.09% |
998,700
+88,900
| +10% | +$10.9M |
|
|
116
PUT
State Street SPDR Portfolio Short Term Treasury ETF
SPTS
$6.07B
| $142M | 0.09% |
1,060,200
-203,400
| -16% | -$5.86M |
|
117
CALL
Mastercard
MA
$476B
| $140M | 0.09% |
327,700
-20,100
| -6% | -$8.07M |
|
118
CALL
Strategy Inc
MSTR
$37B
| $139M | 0.09% |
2,207,000
+970,000
| +78% | +$46M |
|
119
CALL
Palantir
PLTR
$318B
| $139M | 0.09% |
8,117,000
+1,170,500
| +17% | +$20.8M |
|
120
PUT
ASML
ASML
$692B
| $139M | 0.09% |
184,100
-21,800
| -11% | -$14.4M |
|
121
PUT
United Rentals
URI
$63.4B
| $139M | 0.09% |
241,800
+102,400
| +73% | +$48.3M |
|
122
CALL
Morgan Stanley
MS
$340B
| $138M | 0.09% |
1,479,400
+216,800
| +17% | +$17.3M |
|
123
CALL
UnitedHealth
UNH
$396B
| $137M | 0.09% |
261,000
-23,500
| -8% | -$12.5M |
|
124
CALL
Airbnb
ABNB
$85.5B
| $136M | 0.09% |
1,002,500
+65,800
| +7% | +$8.48M |
|
|
125
Alibaba
BABA
$283B
| $136M | 0.09% |
1,760,268
+1,504,903
| +589% | +$120M |
|
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.