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 | |
|---|---|---|---|---|---|---|
1901
CALL
Brown & Brown
BRO
$22.9B
| $2.49M | ﹤0.01% |
35,600
+9,400
| +36% | +$670K |
|
1902
PUT
America Movil
AMX
$78.1B
| $2.48M | ﹤0.01% |
143,400
+142,600
| +17,825% | +$2.79M |
|
1903
CALL
TripAdvisor
TRIP
$1.59B
| $2.48M | ﹤0.01% |
149,800
-17,700
| -11% | -$289K |
|
1904
CALL
Wabtec
WAB
$51.1B
| $2.48M | ﹤0.01% |
23,300
-29,300
| -56% | -$3.26M |
|
1905
PUT
CBRE Group
CBRE
$40.8B
| $2.47M | ﹤0.01% |
33,400
-33,000
| -50% | -$2.74M |
|
1906
CALL
Iovance Biotherapeutics
IOVA
$2.23B
| $2.46M | ﹤0.01% |
541,500
+442,800
| +449% | +$2.89M |
|
1907
PUT
Equinor
EQNR
$95.9B
| $2.46M | ﹤0.01% |
75,100
+50,000
| +199% | +$1.55M |
|
|
MRTX
1908
DELISTED
Mirati Therapeutics, Inc. Common Stock
MRTX
| $2.46M | ﹤0.01% |
56,433
+12,270
| +28% | +$438K |
|
1909
PUT
Ares Capital
ARCC
$13.5B
| $2.45M | ﹤0.01% |
126,000
-12,500
| -9% | -$242K |
|
1910
CALL
Caleres
CAL
$396M
| $2.44M | ﹤0.01% |
85,000
+38,300
| +82% | +$1.02M |
|
|
1911
CALL
CBRE Group
CBRE
$40.8B
| $2.44M | ﹤0.01% |
33,100
-29,100
| -47% | -$2.41M |
|
1912
CALL
Xylem
XYL
$28.5B
| $2.44M | ﹤0.01% |
26,800
+3,700
| +16% | +$382K |
|
1913
PUT
Infosys
INFY
$45B
| $2.44M | ﹤0.01% |
142,400
-28,600
| -17% | -$488K |
|
|
SNCY
1914
PUT
DELISTED
Sun Country Airlines
SNCY
| $2.43M | ﹤0.01% |
163,500
+149,100
| +1,035% | +$2.63M |
|
1915
PUT
Fortive
FTV
$19B
| $2.42M | ﹤0.01% |
43,393
+41,933
| +2,872% | +$2.41M |
|
1916
T. Rowe Price
TROW
$25B
| $2.42M | ﹤0.01% |
23,125
+15,900
| +220% | +$1.79M |
|
1917
CALL
Itaú Unibanco
ITUB
$91.3B
| $2.42M | ﹤0.01% |
510,870
-148,536
| -23% | -$741K |
|
1918
PUT
Corteva
CTVA
$59.7B
| $2.42M | ﹤0.01% |
47,300
+26,000
| +122% | +$1.38M |
|
1919
Spectrum Brands
SPB
$2.04B
| $2.42M | ﹤0.01% |
30,856
-77,877
| -72% | -$6.14M |
|
1920
CALL
Gentherm
THRM
$1.31B
| $2.41M | ﹤0.01% |
44,500
+44,000
| +8,800% | +$2.55M |
|
|
NUVL
1921
PUT
DELISTED
Nuvalent
NUVL
| $2.41M | ﹤0.01% |
+52,500
| New | +$2.33M |
|
1922
CALL
Tidewater
TDW
$3.91B
| $2.4M | ﹤0.01% |
33,800
+2,800
| +9% | +$177K |
|
|
ABCM
1923
CALL
DELISTED
Abcam PLC
ABCM
| $2.4M | ﹤0.01% |
106,000
+101,800
| +2,424% | +$2.34M |
|
1924
CALL
Agilon Health
AGL
$1.64B
| $2.4M | ﹤0.01% |
5,396
+484
| +10% | +$219K |
|
1925
CALL
Centrus Energy
LEU
$3.22B
| $2.4M | ﹤0.01% |
42,200
+32,300
| +326% | +$1.39M |
|
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.