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 | |
|---|---|---|---|---|---|---|
1951
UGI
UGI
$8B
| $2.3M | ﹤0.01% |
100,198
+98,535
| +5,925% | +$2.45M |
|
1952
PUT
Consolidated Edison
ED
$41.6B
| $2.3M | ﹤0.01% |
26,900
+2,600
| +11% | +$237K |
|
1953
PUT
Lumentum
LITE
$59.4B
| $2.3M | ﹤0.01% |
50,900
+26,400
| +108% | +$1.34M |
|
1954
Direxion Daily Financial Bull 3x ETF
FAS
$2.4B
| $2.3M | ﹤0.01% |
39,118
-23,526
| -38% | -$1.57M |
|
1955
CALL
Corsair Gaming
CRSR
$1.05B
| $2.3M | ﹤0.01% |
158,100
-71,700
| -31% | -$1.15M |
|
1956
PUT
Guidewire Software
GWRE
$11.5B
| $2.29M | ﹤0.01% |
25,500
+100
| +0.4% | +$8.35K |
|
|
MRNS
1957
CALL
DELISTED
Marinus Pharmaceuticals, Inc
MRNS
| $2.29M | ﹤0.01% |
285,100
+197,700
| +226% | +$1.64M |
|
1958
CALL
Axsome Therapeutics
AXSM
$12.4B
| $2.29M | ﹤0.01% |
32,800
-36,200
| -52% | -$2.71M |
|
1959
CALL
DXC Technology
DXC
$1.63B
| $2.29M | ﹤0.01% |
110,000
-64,300
| -37% | -$1.48M |
|
1960
Crocs
CROX
$6.69B
| $2.29M | ﹤0.01% |
25,908
-17,353
| -40% | -$1.78M |
|
1961
CALL
Camping World
CWH
$363M
| $2.29M | ﹤0.01% |
112,000
+35,300
| +46% | +$930K |
|
1962
CALL
Celanese
CE
$5.09B
| $2.28M | ﹤0.01% |
18,200
-21,900
| -55% | -$2.69M |
|
1963
Aramark
ARMK
$15B
| $2.28M | ﹤0.01% |
90,886
-1,480
| -2% | -$41.5K |
|
1964
CALL
Academy Sports + Outdoors
ASO
$2.89B
| $2.26M | ﹤0.01% |
47,900
-52,900
| -52% | -$2.83M |
|
1965
PUT
Novavax
NVAX
$1.23B
| $2.26M | ﹤0.01% |
312,700
+187,400
| +150% | +$1.5M |
|
1966
ProShares UltraPro S&P 500
UPRO
$5.1B
| $2.26M | ﹤0.01% |
54,983
+3,033
| +6% | +$143K |
|
1967
CALL
Natural Resource Partners
NRP
$1.3B
| $2.25M | ﹤0.01% |
28,600
+2,800
| +11% | +$182K |
|
1968
CALL
Ollie's Bargain Outlet
OLLI
$4.01B
| $2.25M | ﹤0.01% |
29,200
-700
| -2% | -$51.1K |
|
1969
CALL
Applied Digital
APLD
$7.77B
| $2.25M | ﹤0.01% |
361,000
+237,300
| +192% | +$1.66M |
|
1970
CALL
AeroVironment
AVAV
$7.57B
| $2.25M | ﹤0.01% |
20,200
+12,000
| +146% | +$1.21M |
|
1971
PUT
Invesco Equal Weight 0-30 Year Treasury ETF
GOVI
$1.22B
| $2.25M | ﹤0.01% |
55,800
+28,800
| +107% | +$810K |
|
1972
CALL
Waters Corp
WAT
$36.8B
| $2.25M | ﹤0.01% |
8,200
+5,100
| +165% | +$1.41M |
|
1973
ProShares UltraPro Short S&P 500
SPXU
$436M
| $2.25M | ﹤0.01% |
+9,397
| New | +$2.01M |
|
1974
Coca-Cola
KO
$354B
| $2.24M | ﹤0.01% |
+40,076
| New | +$2.4M |
|
1975
CALL
Magnite
MGNI
$2.65B
| $2.24M | ﹤0.01% |
297,000
+156,200
| +111% | +$1.68M |
|
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.