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 | |
|---|---|---|---|---|---|---|
|
NOVA
1926
CALL
DELISTED
Sunnova Energy
NOVA
| $2.4M | ﹤0.01% |
228,800
+20,600
| +10% | +$322K |
|
1927
CALL
Infosys
INFY
$45B
| $2.38M | ﹤0.01% |
139,300
-253,900
| -65% | -$4.33M |
|
|
WRK
1928
PUT
DELISTED
WestRock Company
WRK
| $2.38M | ﹤0.01% |
66,400
-47,000
| -41% | -$1.54M |
|
1929
CALL
Liberty Global Class C
LBTYK
$3.27B
| $2.38M | ﹤0.01% |
138,800
-158,400
| -53% | -$3.05M |
|
1930
CALL
Vanguard S&P 500 Growth ETF
VOOG
$25.4B
| $2.37M | ﹤0.01% |
60,000
+6,000
| +11% | +$255K |
|
1931
CALL
Eos Energy Enterprises
EOSE
$1.23B
| $2.36M | ﹤0.01% |
1,099,900
+133,100
| +14% | +$398K |
|
1932
argenx
ARGX
$57.4B
| $2.36M | ﹤0.01% |
+4,798
| New | +$2.35M |
|
1933
CALL
A.O. Smith
AOS
$8.38B
| $2.35M | ﹤0.01% |
35,600
+15,700
| +79% | +$1.11M |
|
1934
Tower Semiconductor
TSEM
$26.4B
| $2.35M | ﹤0.01% |
95,646
+88,788
| +1,295% | +$2.85M |
|
1935
CALL
HEICO Corp Class A
HEI.A
$35.4B
| $2.35M | ﹤0.01% |
14,500
+2,600
| +22% | +$352K |
|
1936
PUT
Pinnacle West Capital
PNW
$12.9B
| $2.34M | ﹤0.01% |
31,800
+29,200
| +1,123% | +$2.32M |
|
1937
CALL
dLocal
DLO
$4.26B
| $2.34M | ﹤0.01% |
122,100
+74,600
| +157% | +$1.27M |
|
1938
British American Tobacco
BTI
$132B
| $2.34M | ﹤0.01% |
74,480
-126,300
| -63% | -$4.16M |
|
|
AMAM
1939
CALL
DELISTED
Ambrx Biopharma Inc
AMAM
| $2.33M | ﹤0.01% |
203,000
+190,300
| +1,498% | +$2.59M |
|
1940
CALL
Weyerhaeuser
WY
$17.3B
| $2.33M | ﹤0.01% |
76,100
+12,900
| +20% | +$425K |
|
|
CHGX
1941
CALL
DELISTED
AXS Change Finance ESG ETF
CHGX
| $2.33M | ﹤0.01% |
61,900
-2,000
| -3% | -$62K |
|
1942
PUT
Innovative Industrial Properties
IIPR
$1.78B
| $2.33M | ﹤0.01% |
30,800
+20,000
| +185% | +$1.6M |
|
1943
PUT
Lumen
LUMN
$6.53B
| $2.32M | ﹤0.01% |
1,633,600
+1,369,100
| +518% | +$2.32M |
|
1944
State Street Materials Select Sector SPDR ETF
XLB
$8.51B
| $2.32M | ﹤0.01% |
+59,024
| New | +$2.42M |
|
|
GES
1945
CALL
DELISTED
Guess Inc
GES
| $2.32M | ﹤0.01% |
107,100
-9,600
| -8% | -$203K |
|
1946
PUT
Aptiv
APTV
$12B
| $2.32M | ﹤0.01% |
23,500
-35,100
| -60% | -$3.63M |
|
1947
CALL
MSC Industrial Direct
MSM
$7.02B
| $2.32M | ﹤0.01% |
23,600
+17,600
| +293% | +$1.74M |
|
1948
CALL
ScottsMiracle-Gro
SMG
$4.03B
| $2.31M | ﹤0.01% |
44,800
+8,300
| +23% | +$481K |
|
1949
CALL
Tanger
SKT
$4.82B
| $2.31M | ﹤0.01% |
102,400
+2,600
| +3% | +$60.6K |
|
1950
CALL
Costamare
CMRE
$1.9B
| $2.31M | ﹤0.01% |
240,300
+174,500
| +265% | +$1.78M |
|
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.