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 | |
|---|---|---|---|---|---|---|
3226
Quanta Services
PWR
$93.1B
| $589K | ﹤0.01% |
+3,153
| New | +$632K |
|
3227
PUT
Vermilion Energy
VET
$1.62B
| $589K | ﹤0.01% |
40,300
-31,900
| -44% | -$449K |
|
3228
CALL
Liquidia Corp
LQDA
$7.51B
| $588K | ﹤0.01% |
92,900
+70,700
| +318% | +$509K |
|
3229
CALL
Markel Group
MKL
$25.2B
| $588K | ﹤0.01% |
400
-1,000
| -71% | -$1.46M |
|
3230
Champion Homes
SKY
$4.52B
| $587K | ﹤0.01% |
9,223
+7,944
| +621% | +$533K |
|
3231
PUT
Church & Dwight Co
CHD
$23.4B
| $586K | ﹤0.01% |
6,400
+5,300
| +482% | +$508K |
|
|
GOGL
3232
DELISTED
Golden Ocean Group
GOGL
| $586K | ﹤0.01% |
74,372
+71,853
| +2,852% | +$540K |
|
3233
Impinj
PI
$3.97B
| $586K | ﹤0.01% |
10,652
-11,669
| -52% | -$792K |
|
3234
CALL
Rocket Pharmaceuticals
RCKT
$355M
| $586K | ﹤0.01% |
28,600
-400
| -1% | -$7.27K |
|
3235
CALL
Dover
DOV
$27.7B
| $585K | ﹤0.01% |
4,200
-400
| -9% | -$57.8K |
|
3236
CALL
Howard Hughes
HHH
$3.93B
| $585K | ﹤0.01% |
8,287
+8,077
| +3,846% | +$609K |
|
3237
PUT
Eos Energy Enterprises
EOSE
$1.31B
| $584K | ﹤0.01% |
272,000
+26,500
| +11% | +$79.3K |
|
|
LEV
3238
CALL
DELISTED
The Lion Electric Company
LEV
| $584K | ﹤0.01% |
306,100
+152,800
| +100% | +$332K |
|
3239
Arvinas
ARVN
$530M
| $583K | ﹤0.01% |
29,706
+7,493
| +34% | +$184K |
|
3240
PUT
Commercial Metals
CMC
$7.53B
| $583K | ﹤0.01% |
11,800
+7,200
| +157% | +$391K |
|
|
CALY
3241
Callaway Golf Company
CALY
$3.28B
| $583K | ﹤0.01% |
42,173
-38,267
| -48% | -$672K |
|
|
SNV
3242
DELISTED
Synovus
SNV
| $583K | ﹤0.01% |
+20,984
| New | +$656K |
|
3243
PUT
Companhia Siderúrgica Nacional
SID
$1.49B
| $581K | ﹤0.01% |
243,300
-3,400
| -1% | -$8.71K |
|
3244
PUT
Cathay General Bancorp
CATY
$4.18B
| $580K | ﹤0.01% |
16,700
-600
| -3% | -$21.4K |
|
3245
PUT
Murphy Oil
MUR
$5.38B
| $580K | ﹤0.01% |
12,800
-27,700
| -68% | -$1.21M |
|
3246
PUT
AeroVironment
AVAV
$7.81B
| $579K | ﹤0.01% |
5,200
-1,800
| -26% | -$181K |
|
3247
CALL
Vroom Inc
VRM
$37.5M
| $577K | ﹤0.01% |
6,443
+992
| +18% | +$125K |
|
|
SCPL
3248
PUT
DELISTED
SciPlay Corporation Class A Common Stock
SCPL
| $576K | ﹤0.01% |
25,300
-400
| -2% | -$8.59K |
|
3249
CALL
CleanSpark
CLSK
$3.6B
| $573K | ﹤0.01% |
150,600
+40,500
| +37% | +$214K |
|
3250
CALL
Westlake Corp
WLK
$9.27B
| $573K | ﹤0.01% |
4,600
-1,600
| -26% | -$205K |
|
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.