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 | |
|---|---|---|---|---|---|---|
4151
CALL
Tandem Diabetes Care
TNDM
$1.27B
| $243K | ﹤0.01% |
11,700
-3,400
| -23% | -$93.4K |
|
4152
United States Brent Oil Fund
BNO
$782M
| $242K | ﹤0.01% |
7,571
+4,304
| +132% | +$126K |
|
4153
CALL
Braze
BRZE
$3.02B
| $242K | ﹤0.01% |
5,200
-1,800
| -26% | -$79.1K |
|
4154
CALL
Carriage Services
CSV
$647M
| $242K | ﹤0.01% |
8,600
+1,900
| +28% | +$59.9K |
|
4155
Haemonetics
HAE
$3.88B
| $242K | ﹤0.01% |
+2,712
| New | +$242K |
|
|
BAND
4156
CALL
Bandwidth Inc
BAND
$1.18B
| $241K | ﹤0.01% |
21,400
+5,800
| +37% | +$79K |
|
4157
PUT
Group 1 Automotive
GPI
$4.26B
| $241K | ﹤0.01% |
900
-2,500
| -74% | -$655K |
|
4158
PMV Pharmaceuticals
PMVP
$57.1M
| $241K | ﹤0.01% |
39,359
+28,667
| +268% | +$197K |
|
4159
Sotera Health
SHC
$5B
| $241K | ﹤0.01% |
16,130
-244
| -1% | -$4.12K |
|
4160
CNA Financial
CNA
$14.9B
| $240K | ﹤0.01% |
+6,119
| New | +$242K |
|
4161
PUT
Masco
MAS
$14.6B
| $240K | ﹤0.01% |
4,500
-2,300
| -34% | -$133K |
|
|
OBE
4162
CALL
Obsidian Energy
OBE
$656M
| $240K | ﹤0.01% |
29,200
-23,800
| -45% | -$167K |
|
4163
CALL
SBA Communications
SBAC
$19.8B
| $240K | ﹤0.01% |
1,200
-81,700
| -99% | -$18.2M |
|
4164
CALL
TPG
TPG
$6.76B
| $240K | ﹤0.01% |
8,000
+3,700
| +86% | +$108K |
|
4165
CALL
Telesat
TSAT
$524M
| $240K | ﹤0.01% |
16,800
+16,600
| +8,300% | +$226K |
|
4166
CALL
Zentalis Pharmaceuticals
ZNTL
$332M
| $240K | ﹤0.01% |
12,000
+5,800
| +94% | +$147K |
|
4167
CALL
Atomera
ATOM
$173M
| $239K | ﹤0.01% |
38,300
-3,600
| -9% | -$25.7K |
|
4168
PUT
EVgo
EVGO
$219M
| $239K | ﹤0.01% |
70,800
-100,600
| -59% | -$414K |
|
4169
CALL
Manitowoc
MTW
$491M
| $239K | ﹤0.01% |
15,900
+11,100
| +231% | +$186K |
|
4170
PUT
Cricut
CRCT
$1.01B
| $238K | ﹤0.01% |
25,700
+20,800
| +424% | +$220K |
|
4171
CALL
US Physical Therapy
USPH
$1.22B
| $238K | ﹤0.01% |
+2,600
| New | +$279K |
|
|
VSTO
4172
PUT
DELISTED
Vista Outdoor Inc.
VSTO
| $238K | ﹤0.01% |
7,200
+6,100
| +555% | +$180K |
|
|
IPG
4173
PUT
DELISTED
Interpublic Group of Companies
IPG
| $237K | ﹤0.01% |
8,300
-800
| -9% | -$26.7K |
|
4174
Liquidia Corp
LQDA
$7.72B
| $237K | ﹤0.01% |
37,387
+9,926
| +36% | +$71.5K |
|
4175
PUT
Boise Cascade
BCC
$2.73B
| $236K | ﹤0.01% |
2,300
-3,400
| -60% | -$350K |
|
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.