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 | |
|---|---|---|---|---|---|---|
3976
CALL
Baytex Energy
BTE
$2.86B
| $288K | ﹤0.01% |
65,500
-61,000
| -48% | -$239K |
|
3977
Invesco CurrencyShares Australian Dollar Trust
FXA
$96.7M
| $288K | ﹤0.01% |
4,525
+4,321
| +2,118% | +$280K |
|
3978
CALL
Tetra Tech
TTEK
$8.7B
| $288K | ﹤0.01% |
9,500
+9,000
| +1,800% | +$292K |
|
3979
PUT
Tradeweb Markets
TW
$22.2B
| $288K | ﹤0.01% |
3,600
+200
| +6% | +$15.9K |
|
3980
Allot
ALLT
$373M
| $287K | ﹤0.01% |
131,717
+130,642
| +12,153% | +$322K |
|
3981
PUT
Microvision
MVIS
$86.6M
| $287K | ﹤0.01% |
131,400
-3,800
| -3% | -$11.6K |
|
3982
PUT
RLX Technology
RLX
$2.43B
| $287K | ﹤0.01% |
190,100
+173,600
| +1,052% | +$272K |
|
3983
PUT
Frontier Group Holdings
ULCC
$1.43B
| $287K | ﹤0.01% |
59,300
+56,700
| +2,181% | +$425K |
|
3984
RPC Inc
RES
$1.14B
| $286K | ﹤0.01% |
+32,084
| New | +$268K |
|
3985
CALL
Energy Fuels
UUUU
$2.83B
| $286K | ﹤0.01% |
34,900
-2,400
| -6% | -$16.5K |
|
3986
iShares National Muni Bond ETF
MUB
$45.3B
| $285K | ﹤0.01% |
2,781
+822
| +42% | +$86.7K |
|
3987
PUT
Navient
NAVI
$822M
| $285K | ﹤0.01% |
16,600
-2,200
| -12% | -$39.6K |
|
|
RDFN
3988
DELISTED
Redfin
RDFN
| $285K | ﹤0.01% |
+40,547
| New | +$445K |
|
|
UNIT
3989
CALL
Uniti Group
UNIT
$2.53B
| $285K | ﹤0.01% |
60,400
+52,600
| +674% | +$269K |
|
3990
Warner Music
WMG
$15B
| $285K | ﹤0.01% |
+9,079
| New | +$284K |
|
3991
CALL
WD-40
WDFC
$3.08B
| $284K | ﹤0.01% |
1,400
-800
| -36% | -$171K |
|
3992
CALL
Verisk Analytics
VRSK
$27.8B
| $283K | ﹤0.01% |
1,200
-2,100
| -64% | -$495K |
|
3993
CALL
AZZ Inc
AZZ
$4.41B
| $282K | ﹤0.01% |
6,200
+6,100
| +6,100% | +$279K |
|
|
CWAN
3994
CALL
DELISTED
Clearwater Analytics
CWAN
| $282K | ﹤0.01% |
14,600
+14,500
| +14,500% | +$256K |
|
3995
SandRidge Energy
SD
$485M
| $282K | ﹤0.01% |
18,023
+15,108
| +518% | +$242K |
|
3996
LendingTree
TREE
$572M
| $282K | ﹤0.01% |
+18,253
| New | +$370K |
|
3997
CALL
Beam Therapeutics
BEAM
$2.7B
| $281K | ﹤0.01% |
11,700
+5,700
| +95% | +$153K |
|
3998
PUT
Vishay Intertechnology
VSH
$5.02B
| $281K | ﹤0.01% |
11,400
+300
| +3% | +$8.09K |
|
|
SOVO
3999
CALL
DELISTED
Sovos Brands, Inc. Common Stock
SOVO
| $281K | ﹤0.01% |
12,500
+12,200
| +4,067% | +$257K |
|
4000
CALL
Innoviz Technologies
INVZ
$99.5M
| $280K | ﹤0.01% |
144,000
+8,900
| +7% | +$23.9K |
|
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.