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 | |
|---|---|---|---|---|---|---|
26
PUT
Broadcom
AVGO
$1.84T
| $767M | 0.49% |
6,875,000
+2,385,000
| +53% | +$226M |
|
27
PUT
State Street SPDR NYSE Technology ETF
XNTK
$2.16B
| $758M | 0.48% |
10,855,900
+2,788,100
| +35% | +$412M |
|
28
PUT
Netflix
NFLX
$286B
| $708M | 0.45% |
15,522,000
-1,235,000
| -7% | -$53.9M |
|
|
29
CALL
Alibaba
BABA
$283B
| $682M | 0.44% |
8,793,000
+2,241,400
| +34% | +$179M |
|
|
30
CALL
Netflix
NFLX
$286B
| $661M | 0.42% |
13,567,000
-1,640,000
| -11% | -$71.6M |
|
|
31
CALL
State Street SPDR NYSE Technology ETF
XNTK
$2.16B
| $650M | 0.42% |
9,970,900
+5,202,500
| +109% | +$769M |
|
32
PUT
Advanced Micro Devices
AMD
$888B
| $612M | 0.39% |
4,232,400
-188,100
| -4% | -$22.2M |
|
|
33
CALL
Advanced Micro Devices
AMD
$888B
| $593M | 0.38% |
4,021,800
-231,400
| -5% | -$27.3M |
|
|
34
PUT
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$46B
| $555M | 0.35% |
1,472,100
-334,700
| -19% | -$117M |
|
35
PUT
Coinbase
COIN
$46.3B
| $455M | 0.29% |
2,615,100
+247,700
| +10% | +$27M |
|
36
PUT
iShares Morningstar Value ETF
ILCV
$1.3B
| $451M | 0.29% |
5,539,000
+497,900
| +10% | +$33M |
|
37
PUT
Costco
COST
$412B
| $439M | 0.28% |
665,100
+314,400
| +90% | +$186M |
|
38
CALL
Boeing
BA
$161B
| $438M | 0.28% |
1,679,000
+492,100
| +41% | +$105M |
|
|
39
CALL
Broadcom
AVGO
$1.84T
| $431M | 0.28% |
3,864,000
+24,000
| +0.6% | +$2.27M |
|
40
CALL
VanEck Gold Miners ETF
GDX
$22.7B
| $393M | 0.25% |
6,907,100
-1,775,600
| -20% | -$52M |
|
41
CALL
PayPal
PYPL
$49.3B
| $387M | 0.25% |
6,299,600
+1,806,400
| +40% | +$103M |
|
|
42
CALL
Citigroup
C
$223B
| $360M | 0.23% |
6,996,900
+2,136,900
| +44% | +$94.6M |
|
|
43
CALL
Coinbase
COIN
$46.3B
| $356M | 0.23% |
2,046,900
+319,500
| +18% | +$34.9M |
|
44
PUT
Adobe
ADBE
$90.3B
| $347M | 0.22% |
582,400
+118,800
| +26% | +$68.5M |
|
|
45
PUT
Boeing
BA
$161B
| $324M | 0.21% |
1,244,100
-12,000
| -1% | -$2.57M |
|
46
CALL
JPMorgan Chase
JPM
$918B
| $323M | 0.21% |
1,925,000
-103,500
| -5% | -$15.7M |
|
|
47
CALL
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$46B
| $322M | 0.21% |
854,900
-674,500
| -44% | -$236M |
|
|
48
CALL
Adobe
ADBE
$90.3B
| $318M | 0.2% |
532,800
-82,300
| -13% | -$47.5M |
|
|
49
CALL
Costco
COST
$412B
| $310M | 0.2% |
469,500
+209,900
| +81% | +$124M |
|
|
50
PUT
VanEck Gold Miners ETF
GDX
$22.7B
| $310M | 0.2% |
4,000,100
+412,200
| +11% | +$12.1M |
|
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.