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 | |
|---|---|---|---|---|---|---|
2176
PUT
Canadian National Railway
CNI
$78.3B
| $1.76M | ﹤0.01% |
16,300
-2,400
| -13% | -$275K |
|
2177
PUT
H&R Block
HRB
$5.18B
| $1.76M | ﹤0.01% |
41,000
-11,600
| -22% | -$428K |
|
2178
CALL
Grab
GRAB
$13.5B
| $1.76M | ﹤0.01% |
497,500
+50,100
| +11% | +$179K |
|
2179
PUT
Cullen/Frost Bankers
CFR
$10.3B
| $1.76M | ﹤0.01% |
19,300
+3,300
| +21% | +$335K |
|
2180
Cenovus Energy
CVE
$54.6B
| $1.75M | ﹤0.01% |
84,241
-96,228
| -53% | -$1.84M |
|
2181
PUT
Vertiv
VRT
$112B
| $1.75M | ﹤0.01% |
47,100
+19,500
| +71% | +$643K |
|
|
WW
2182
PUT
DELISTED
WW International
WW
| $1.75M | ﹤0.01% |
158,200
+62,400
| +65% | +$613K |
|
2183
United States Natural Gas Fund
UNG
$470M
| $1.74M | ﹤0.01% |
63,865
-45,553
| -42% | -$1.27M |
|
|
DO
2184
CALL
DELISTED
Diamond Offshore Drilling, Inc.
DO
| $1.74M | ﹤0.01% |
118,700
+8,400
| +8% | +$128K |
|
2185
CALL
Establishment Labs
ESTA
$2.72B
| $1.74M | ﹤0.01% |
35,500
+13,100
| +58% | +$783K |
|
|
IMGN
2186
CALL
DELISTED
Immunogen Inc
IMGN
| $1.74M | ﹤0.01% |
109,700
+11,400
| +12% | +$190K |
|
|
EWCZ
2187
CALL
DELISTED
European Wax Center
EWCZ
| $1.74M | ﹤0.01% |
107,300
-700
| -0.6% | -$12.6K |
|
2188
Rambus
RMBS
$10.4B
| $1.74M | ﹤0.01% |
31,157
+15,326
| +97% | +$870K |
|
2189
CALL
Vista Energy
VIST
$7.75B
| $1.74M | ﹤0.01% |
57,200
+51,200
| +853% | +$1.34M |
|
2190
Noble Corp
NE
$6.9B
| $1.74M | ﹤0.01% |
34,269
+30,764
| +878% | +$1.57M |
|
|
PLL
2191
CALL
DELISTED
Piedmont Lithium
PLL
| $1.73M | ﹤0.01% |
43,700
+12,900
| +42% | +$627K |
|
2192
PUT
Replimune Group
REPL
$814M
| $1.73M | ﹤0.01% |
101,300
+99,700
| +6,231% | +$1.96M |
|
2193
CoreCivic
CXW
$3.1B
| $1.73M | ﹤0.01% |
154,009
+113,388
| +279% | +$1.14M |
|
2194
Sempra
SRE
$60.8B
| $1.73M | ﹤0.01% |
25,448
+25,238
| +12,018% | +$1.82M |
|
2195
PUT
FS KKR Capital
FSK
$2.98B
| $1.73M | ﹤0.01% |
87,900
+66,700
| +315% | +$1.33M |
|
2196
CALL
Blue Owl Capital
OBDC
$5.35B
| $1.73M | ﹤0.01% |
124,800
+16,100
| +15% | +$222K |
|
|
LAC
2197
PUT
DELISTED
Lithium Americas Corp. Common Shares
LAC
| $1.73M | ﹤0.01% |
101,600
-19,200
| -16% | -$362K |
|
2198
CALL
Winnebago Industries
WGO
$870M
| $1.72M | ﹤0.01% |
29,000
-20,400
| -41% | -$1.32M |
|
2199
Celanese
CE
$5.09B
| $1.72M | ﹤0.01% |
13,733
+13,525
| +6,502% | +$1.66M |
|
2200
PUT
International Paper
IP
$22.3B
| $1.72M | ﹤0.01% |
48,600
+28,900
| +147% | +$983K |
|
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.