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 | |
|---|---|---|---|---|---|---|
76
PUT
Strategy Inc
MSTR
$37B
| $202M | 0.13% |
3,196,000
+1,040,000
| +48% | +$49.3M |
|
77
CALL
Shopify
SHOP
$160B
| $202M | 0.13% |
2,589,700
+253,800
| +11% | +$16.2M |
|
78
PUT
UnitedHealth
UNH
$396B
| $199M | 0.13% |
377,300
+24,700
| +7% | +$13.2M |
|
|
79
PUT
Walt Disney
DIS
$167B
| $191M | 0.12% |
2,139,900
+66,300
| +3% | +$5.84M |
|
80
PUT
Eli Lilly
LLY
$1.02T
| $189M | 0.12% |
323,500
+54,000
| +20% | +$31.5M |
|
81
CALL
Snowflake
SNOW
$94.2B
| $184M | 0.12% |
925,900
-139,800
| -13% | -$23.6M |
|
|
UWC
82
CALL
DELISTED
PROSHARES TR ULTRA RUSSELL3000
UWC
| $183M | 0.12% |
3,579,700
+460,400
| +15% | +$23.6M |
|
83
CALL
Bank of America
BAC
$430B
| $183M | 0.12% |
5,438,500
+719,500
| +15% | +$20.9M |
|
84
CALL
Micron Technology
MU
$1.1T
| $182M | 0.12% |
2,136,000
+238,000
| +13% | +$17.7M |
|
|
XYZ
85
CALL
Block Inc
XYZ
$47.8B
| $180M | 0.12% |
2,327,100
+180,700
| +8% | +$10.2M |
|
86
PUT
Pinduoduo
PDD
$121B
| $178M | 0.11% |
1,441,700
+348,800
| +32% | +$42.3M |
|
87
CALL
Direxion Daily S&P Oil & Gas Exp. & Prod. Bull 2X ETF
GUSH
$247M
| $177M | 0.11% |
4,513,700
+2,343,700
| +108% | +$81.8M |
|
88
CALL
Palo Alto Networks
PANW
$279B
| $175M | 0.11% |
1,185,000
-9,800
| -0.8% | -$1.31M |
|
89
CALL
AbbVie
ABBV
$448B
| $174M | 0.11% |
1,123,600
+216,700
| +24% | +$31.6M |
|
90
PUT
Nike
NKE
$63.7B
| $173M | 0.11% |
1,594,300
+328,000
| +26% | +$35.2M |
|
91
CALL
Uber
UBER
$146B
| $170M | 0.11% |
2,769,000
-347,600
| -11% | -$18.2M |
|
|
92
PUT
Uber
UBER
$146B
| $170M | 0.11% |
3,358,900
+1,021,800
| +44% | +$53.5M |
|
93
CALL
Direxion Daily Technology Bull 3x ETF
TECL
$5.6B
| $168M | 0.11% |
4,510,400
+1,899,500
| +73% | +$103M |
|
94
PUT
Airbnb
ABNB
$86B
| $167M | 0.11% |
1,227,000
+379,200
| +45% | +$48.9M |
|
95
CALL
Qualcomm
QCOM
$183B
| $163M | 0.1% |
1,125,100
+186,100
| +20% | +$23M |
|
96
PUT
First Solar
FSLR
$22.1B
| $162M | 0.1% |
941,500
+55,600
| +6% | +$8.5M |
|
97
CALL
Home Depot
HD
$332B
| $161M | 0.1% |
465,800
+182,800
| +65% | +$56.6M |
|
98
CALL
ARK Space & Defense Innovation ETF
ARKX
$823M
| $159M | 0.1% |
3,234,500
+1,226,000
| +61% | +$17.2M |
|
99
PUT
Occidental Petroleum
OXY
$56.2B
| $159M | 0.1% |
2,663,200
+716,600
| +37% | +$43.7M |
|
100
CALL
Chevron
CVX
$381B
| $158M | 0.1% |
1,359,600
+442,300
| +48% | +$66.9M |
|
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.