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 | |
|---|---|---|---|---|---|---|
5126
Jackson Financial
JXN
$8.5B
| $96K | ﹤0.01% |
2,522
-17,268
| -87% | -$603K |
|
5127
CALL
Omeros
OMER
$863M
| $96K | ﹤0.01% |
33,100
-157,500
| -83% | -$632K |
|
|
PINC
5128
CALL
DELISTED
Premier
PINC
| $96K | ﹤0.01% |
4,500
+4,400
| +4,400% | +$110K |
|
5129
Perdoceo Education
PRDO
$2.04B
| $96K | ﹤0.01% |
5,615
+5,128
| +1,053% | +$78.1K |
|
5130
PUT
UroGen Pharma
URGN
$2B
| $96K | ﹤0.01% |
+6,900
| New | +$111K |
|
5131
PUT
Alkermes
ALKS
$8.39B
| $95K | ﹤0.01% |
3,400
-13,600
| -80% | -$399K |
|
5132
Allison Transmission
ALSN
$9.57B
| $95K | ﹤0.01% |
1,612
-10,429
| -87% | -$614K |
|
5133
Appian
APPN
$1.94B
| $95K | ﹤0.01% |
2,092
+469
| +29% | +$22.5K |
|
5134
CALL
AerSale
ASLE
$291M
| $95K | ﹤0.01% |
6,400
+4,300
| +205% | +$62K |
|
5135
PUT
Atmos Energy
ATO
$29.1B
| $95K | ﹤0.01% |
900
| – | – |
|
5136
Flowers Foods
FLO
$1.51B
| $95K | ﹤0.01% |
+4,302
| New | +$103K |
|
5137
Genesco
GCO
$429M
| $95K | ﹤0.01% |
+3,089
| New | +$87.7K |
|
|
NVNO
5138
enVVeno Medical
NVNO
$7.09M
| $95K | ﹤0.01% |
+507
| New | +$84.6K |
|
5139
PUT
Pegasystems
PEGA
$4.94B
| $95K | ﹤0.01% |
+4,400
| New | +$108K |
|
5140
PTC
PTC
$15.7B
| $95K | ﹤0.01% |
+677
| New | +$96.8K |
|
5141
PUT
Radian Group
RDN
$5.16B
| $95K | ﹤0.01% |
3,800
+3,300
| +660% | +$87.2K |
|
5142
CALL
Sportradar
SRAD
$4.35B
| $95K | ﹤0.01% |
9,500
+5,600
| +144% | +$70.1K |
|
5143
PUT
Sterling Infrastructure
STRL
$17.8B
| $95K | ﹤0.01% |
1,300
-1,800
| -58% | -$126K |
|
5144
Viper Energy
VNOM
$8.48B
| $95K | ﹤0.01% |
3,423
-1,644
| -32% | -$45.3K |
|
|
CTEV
5145
Claritev Corp
CTEV
$402M
| $95K | ﹤0.01% |
1,421
-493
| -26% | -$36.4K |
|
|
AGR
5146
DELISTED
Avangrid, Inc.
AGR
| $95K | ﹤0.01% |
3,161
+3,148
| +24,215% | +$111K |
|
5147
CALL
Agios Pharmaceuticals
AGIO
$1.95B
| $94K | ﹤0.01% |
3,800
+2,300
| +153% | +$60.8K |
|
5148
PUT
American States Water
AWR
$3.37B
| $94K | ﹤0.01% |
1,200
+1,000
| +500% | +$85.2K |
|
5149
Cars.com
CARS
$664M
| $94K | ﹤0.01% |
5,596
+2,505
| +81% | +$48.9K |
|
5150
PUT
Invesco
IVZ
$13B
| $94K | ﹤0.01% |
6,500
-3,800
| -37% | -$61.2K |
|
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.