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 | |
|---|---|---|---|---|---|---|
2151
CALL
Navios Maritime Partners
NMM
$2.25B
| $1.83M | ﹤0.01% |
79,100
+70,200
| +789% | +$1.6M |
|
|
CERE
2152
CALL
DELISTED
Cerevel Therapeutics Holdings, Inc. Common Stock
CERE
| $1.83M | ﹤0.01% |
83,800
+66,800
| +393% | +$1.67M |
|
2153
PUT
VSE Corp
VSEC
$5.48B
| $1.82M | ﹤0.01% |
36,200
+30,000
| +484% | +$1.63M |
|
|
SWN
2154
CALL
DELISTED
Southwestern Energy Company
SWN
| $1.82M | ﹤0.01% |
282,300
+37,900
| +16% | +$242K |
|
|
PGTI
2155
CALL
DELISTED
PGT, Inc.
PGTI
| $1.81M | ﹤0.01% |
65,400
+41,000
| +168% | +$1.13M |
|
2156
PUT
Entergy
ETR
$54.1B
| $1.81M | ﹤0.01% |
39,200
+36,400
| +1,300% | +$1.78M |
|
|
HTGCR
2157
CALL
DELISTED
HERCULES TECHNOLOGY GROWTH CAP INC TRANS RGTS TO PUR COM STK
HTGCR
| $1.81M | ﹤0.01% |
110,400
-6,000
| -5% | -$98.5K |
|
2158
CALL
Incyte
INCY
$23.5B
| $1.81M | ﹤0.01% |
31,300
-13,400
| -30% | -$845K |
|
2159
PUT
Roivant Sciences
ROIV
$25.2B
| $1.81M | ﹤0.01% |
154,800
+134,700
| +670% | +$1.52M |
|
2160
CALL
IPG Photonics
IPGP
$3.89B
| $1.81M | ﹤0.01% |
17,800
+16,200
| +1,013% | +$1.83M |
|
2161
PUT
Tanger
SKT
$4.82B
| $1.8M | ﹤0.01% |
79,900
+47,900
| +150% | +$1.12M |
|
2162
PUT
Cinemark Holdings
CNK
$3.82B
| $1.8M | ﹤0.01% |
98,200
-27,900
| -22% | -$467K |
|
2163
PUT
Leidos
LDOS
$14.1B
| $1.8M | ﹤0.01% |
19,500
+700
| +4% | +$65.9K |
|
2164
CALL
Cullen/Frost Bankers
CFR
$10.3B
| $1.8M | ﹤0.01% |
19,700
+14,100
| +252% | +$1.43M |
|
|
GES
2165
PUT
DELISTED
Guess Inc
GES
| $1.79M | ﹤0.01% |
82,800
+42,200
| +104% | +$892K |
|
2166
Manchester United
MANU
$3.91B
| $1.79M | ﹤0.01% |
90,543
-45,211
| -33% | -$984K |
|
2167
Flex
FLEX
$43.4B
| $1.78M | ﹤0.01% |
87,835
+77,657
| +763% | +$1.57M |
|
2168
Nexstar Media Group
NXST
$5.6B
| $1.78M | ﹤0.01% |
12,445
+445
| +4% | +$72.2K |
|
2169
PUT
Semtech
SMTC
$11.7B
| $1.78M | ﹤0.01% |
69,100
+15,600
| +29% | +$410K |
|
2170
PUT
CSX Corp
CSX
$98.6B
| $1.78M | ﹤0.01% |
57,800
-10,800
| -16% | -$342K |
|
2171
Kimberly-Clark
KMB
$36.4B
| $1.77M | ﹤0.01% |
+14,682
| New | +$1.9M |
|
2172
Western Union
WU
$2.57B
| $1.77M | ﹤0.01% |
134,295
+40,075
| +43% | +$491K |
|
2173
CALL
Kyndryl
KD
$2.66B
| $1.77M | ﹤0.01% |
117,200
-298,300
| -72% | -$4.42M |
|
|
2174
CALL
Roivant Sciences
ROIV
$25.2B
| $1.77M | ﹤0.01% |
151,300
+49,000
| +48% | +$554K |
|
2175
PUT
Elanco Animal Health
ELAN
$12.4B
| $1.77M | ﹤0.01% |
157,200
-30,300
| -16% | -$352K |
|
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.