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 | |
|---|---|---|---|---|---|---|
|
RPTX
3101
CALL
DELISTED
Repare Therapeutics
RPTX
| $658K | ﹤0.01% |
54,500
+53,800
| +7,686% | +$555K |
|
3102
Amphenol
APH
$184B
| $657K | ﹤0.01% |
+15,654
| New | +$673K |
|
3103
Chewy
CHWY
$8.93B
| $657K | ﹤0.01% |
35,999
+18,267
| +103% | +$522K |
|
3104
CALL
Ferguson
FERG
$45.4B
| $657K | ﹤0.01% |
4,000
-38,000
| -90% | -$6M |
|
3105
PUT
CVR Energy
CVI
$3.43B
| $656K | ﹤0.01% |
19,300
+17,800
| +1,187% | +$608K |
|
3106
PUT
United States Gasoline Fund
UGA
$143M
| $656K | ﹤0.01% |
9,700
+5,800
| +149% | +$408K |
|
3107
PUT
Alcon
ALC
$32.8B
| $655K | ﹤0.01% |
8,500
+4,300
| +102% | +$354K |
|
3108
PUT
Jacobs Solutions
J
$16B
| $655K | ﹤0.01% |
5,803
-1,814
| -24% | -$195K |
|
3109
PUT
Nokia
NOK
$51.8B
| $655K | ﹤0.01% |
175,300
-13,700
| -7% | -$54K |
|
3110
PUT
Virgin Galactic
SPCE
$325M
| $654K | ﹤0.01% |
18,175
-17,095
| -48% | -$1.02M |
|
3111
PUT
Energy Fuels
UUUU
$2.93B
| $653K | ﹤0.01% |
79,500
+66,300
| +502% | +$456K |
|
3112
PUT
Zai Lab
ZLAB
$2.1B
| $651K | ﹤0.01% |
26,800
+100
| +0.4% | +$2.66K |
|
|
INFN
3113
CALL
DELISTED
Infinera Corporation Common Stock
INFN
| $651K | ﹤0.01% |
155,900
-12,400
| -7% | -$53.5K |
|
3114
Procept Biorobotics
PRCT
$1.01B
| $650K | ﹤0.01% |
19,838
+6,306
| +47% | +$215K |
|
3115
CALL
Curis
CRIS
$9.14M
| $649K | ﹤0.01% |
4,925
+4,692
| +2,014% | +$1.21M |
|
3116
CALL
Asure Software
ASUR
$222M
| $648K | ﹤0.01% |
68,600
+22,600
| +49% | +$274K |
|
3117
ProShares Ultra Bloomberg Natural Gas
BOIL
$348M
| $648K | ﹤0.01% |
1,192
-61
| -5% | -$37.1K |
|
3118
PUT
Joby Aviation
JOBY
$7.25B
| $648K | ﹤0.01% |
100,600
+32,600
| +48% | +$257K |
|
3119
CALL
Suburban Propane Partners
SPH
$1.21B
| $648K | ﹤0.01% |
40,400
+25,800
| +177% | +$381K |
|
3120
CALL
MannKind Corp
MNKD
$1.22B
| $647K | ﹤0.01% |
156,700
+19,900
| +15% | +$89.4K |
|
|
PENG
3121
CALL
Penguin Solutions Inc
PENG
$2.69B
| $647K | ﹤0.01% |
26,600
-31,000
| -54% | -$783K |
|
|
SCS
3122
CALL
DELISTED
Steelcase
SCS
| $646K | ﹤0.01% |
57,900
+55,500
| +2,313% | +$486K |
|
3123
Direxion Daily Junior Gold Miners Index Bear 2X ETF
JDST
$29.8M
| $645K | ﹤0.01% |
391
-236
| -38% | -$330K |
|
3124
CALL
Moelis & Co
MC
$5.04B
| $645K | ﹤0.01% |
14,300
+500
| +4% | +$23.5K |
|
3125
CALL
SoundHound AI
SOUN
$2.79B
| $645K | ﹤0.01% |
321,200
-311,600
| -49% | -$793K |
|
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.