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 |
Amazon
AMZN
|
+$113M |
| 2 |
SPDR Gold Trust
GLD
|
+$68.6M |
| 3 |
NVIDIA
NVDA
|
+$63.4M |
| 4 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$55.2M |
| 5 |
Apple
AAPL
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Netflix
NFLX
|
+$27.1M |
| 2 |
Qualcomm
QCOM
|
+$24.6M |
| 3 |
Walt Disney
DIS
|
+$21.2M |
| 4 |
Advanced Micro Devices
AMD
|
+$18.2M |
| 5 |
Snowflake
SNOW
|
+$16.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.44% |
| 2 | Consumer Discretionary | 0.32% |
| 3 | Healthcare | 0.22% |
| 4 | Financials | 0.17% |
| 5 | Communication Services | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
101
CALL
Shopify
SHOP
$153B
| $127M | 0.1% |
2,335,900
-120,800
| -5% | -$7.32M |
|
|
SCHW
102
CALL
Charles Schwab
SCHW
$173B
| $127M | 0.1% |
2,319,700
+565,100
| +32% | +$34.2M |
|
103
PUT
Caterpillar
CAT
$415B
| $127M | 0.1% |
466,100
-58,900
| -11% | -$16M |
|
104
PUT
Chevron
CVX
$382B
| $127M | 0.1% |
751,600
+176,800
| +31% | +$28.6M |
|
105
PUT
Berkshire Hathaway Class B
BRK.B
$1.05T
| $126M | 0.1% |
360,900
+64,800
| +22% | +$23M |
|
106
PUT
Cisco
CSCO
$445B
| $126M | 0.1% |
2,350,500
-88,800
| -4% | -$4.79M |
|
107
PUT
Occidental Petroleum
OXY
$56.8B
| $126M | 0.1% |
1,946,600
+176,000
| +10% | +$11.1M |
|
108
PUT
Vanguard S&P 500 ETF
VOO
$982B
| $126M | 0.1% |
466,700
+50,800
| +12% | +$20.8M |
|
|
109
NVIDIA
NVDA
$5.16T
| $123M | 0.1% |
2,835,340
+1,416,010
| +100% | +$63.4M |
|
110
PUT
ASML
ASML
$694B
| $121M | 0.1% |
205,900
+39,100
| +23% | +$26M |
|
111
PUT
Royal Caribbean
RCL
$76.8B
| $121M | 0.1% |
1,315,300
-92,500
| -7% | -$9.27M |
|
112
PUT
Nike
NKE
$62.5B
| $121M | 0.1% |
1,266,300
+207,800
| +20% | +$21.4M |
|
113
CALL
Union Pacific
UNP
$174B
| $119M | 0.09% |
583,700
+205,100
| +54% | +$44.7M |
|
114
PUT
Visa
V
$676B
| $116M | 0.09% |
506,200
+2,200
| +0.4% | +$529K |
|
115
PUT
Airbnb
ABNB
$84B
| $116M | 0.09% |
847,800
-50,100
| -6% | -$6.92M |
|
116
PUT
Applied Materials
AMAT
$445B
| $116M | 0.09% |
838,600
+211,300
| +34% | +$30.3M |
|
|
117
PUT
Snowflake
SNOW
$92.7B
| $114M | 0.09% |
746,400
-9,300
| -1% | -$1.51M |
|
|
UWC
118
CALL
DELISTED
PROSHARES TR ULTRA RUSSELL3000
UWC
| $112M | 0.09% |
3,119,300
+559,100
| +22% | +$20.1M |
|
119
CALL
Palantir
PLTR
$304B
| $111M | 0.09% |
6,946,500
+1,580,100
| +29% | +$25.2M |
|
|
120
CALL
ASML
ASML
$694B
| $109M | 0.09% |
184,500
+19,200
| +12% | +$12.8M |
|
121
PUT
Uber
UBER
$144B
| $107M | 0.08% |
2,337,100
-1,328,800
| -36% | -$60.7M |
|
122
PUT
Pinduoduo
PDD
$119B
| $107M | 0.08% |
1,092,900
-277,700
| -20% | -$23.9M |
|
|
123
Amazon
AMZN
$2.62T
| $107M | 0.08% |
+841,102
| New | +$113M |
|
124
PUT
Super Micro Computer
SMCI
$20.5B
| $106M | 0.08% |
3,854,000
+583,000
| +18% | +$16.3M |
|
|
125
CALL
Cisco
CSCO
$445B
| $106M | 0.08% |
1,965,700
-554,800
| -22% | -$29.9M |
|
Similar funds
Simplex Trading's Q3 2023 Portfolio in Review
As of Q3 2023, Simplex Trading held 10,417 positions worth $127B, up 4.5% from $122B the previous quarter. Its ten largest holdings account for 44% of the portfolio.
Simplex Trading deployed $11.9B of net new capital in Q3 2023, opening 1,399 new positions and adding to 3,690 existing holdings. Its largest new stake was Amazon: 841,102 shares worth $107M.
By sector, the portfolio is most concentrated in Technology at 0.44% of assets, up from 0.41% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Netflix, an estimated $27.1M trimmed.
- Simplex Trading's largest Q3 2023 buy was Amazon: 841,102 shares worth $107M.
- Simplex Trading added most to SPDR Gold Trust in Q3 2023, an estimated $68.6M increase.
- Simplex Trading's biggest Q3 2023 reduction was Netflix, cutting an estimated $27.1M.
- Simplex Trading fully exited Qualcomm in Q3 2023, selling an estimated $24.6M.
- Simplex Trading's ten largest holdings make up 44% of its $127B portfolio in Q3 2023.
- Simplex Trading opened 1,399 new positions and closed 1,719 in Q3 2023.
- Simplex Trading's portfolio value rose 4.5% quarter-over-quarter to $127B.
Based on Simplex Trading's 13F filing for Q3 2023, filed 1 Nov 2023.