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 | |
|---|---|---|---|---|---|---|
2126
PUT
Under Armour Class C
UA
$2.92B
| $1.89M | ﹤0.01% |
280,100
-29,300
| -9% | -$202K |
|
2127
Avantor
AVTR
$7.81B
| $1.89M | ﹤0.01% |
+89,554
| New | +$1.9M |
|
2128
CALL
Coursera
COUR
$1.54B
| $1.89M | ﹤0.01% |
100,900
+56,800
| +129% | +$906K |
|
2129
CALL
Darling Ingredients
DAR
$9.93B
| $1.88M | ﹤0.01% |
36,100
-9,700
| -21% | -$606K |
|
2130
CALL
CVR Partners
UAN
$1.3B
| $1.88M | ﹤0.01% |
22,800
+8,300
| +57% | +$688K |
|
|
SNV
2131
PUT
DELISTED
Synovus
SNV
| $1.88M | ﹤0.01% |
67,600
+56,000
| +483% | +$1.75M |
|
2132
CALL
Cardlytics
CDLX
$21M
| $1.88M | ﹤0.01% |
11,380
+10,770
| +1,766% | +$1.4M |
|
|
GRMN
2133
Garmin
GRMN
$46.9B
| $1.88M | ﹤0.01% |
17,851
+11,718
| +191% | +$1.23M |
|
2134
CALL
TAL Education Group
TAL
$5.71B
| $1.87M | ﹤0.01% |
205,800
-5,500
| -3% | -$38.6K |
|
2135
CALL
Modine Manufacturing
MOD
$12.8B
| $1.87M | ﹤0.01% |
40,900
+34,800
| +570% | +$1.46M |
|
2136
PUT
Applied Digital
APLD
$7.77B
| $1.87M | ﹤0.01% |
299,600
+264,500
| +754% | +$1.85M |
|
2137
CALL
Amplify Online Retail ETF
IBUY
$106M
| $1.87M | ﹤0.01% |
85,000
+16,900
| +25% | +$810K |
|
2138
CALL
Steris
STE
$20.9B
| $1.86M | ﹤0.01% |
8,500
-13,700
| -62% | -$3.1M |
|
2139
CALL
Gulfport Energy Corp
GPOR
$2.83B
| $1.86M | ﹤0.01% |
+15,700
| New | +$1.74M |
|
2140
Global Payments
GPN
$22.1B
| $1.86M | ﹤0.01% |
16,136
+9,998
| +163% | +$1.19M |
|
2141
Vale
VALE
$62.9B
| $1.86M | ﹤0.01% |
138,862
+52,216
| +60% | +$711K |
|
|
MRTX
2142
PUT
DELISTED
Mirati Therapeutics, Inc. Common Stock
MRTX
| $1.86M | ﹤0.01% |
42,700
+4,700
| +12% | +$168K |
|
2143
CALL
Scotiabank
BNS
$106B
| $1.85M | ﹤0.01% |
40,700
-146,800
| -78% | -$7.03M |
|
2144
PUT
Martin Marietta Materials
MLM
$33.6B
| $1.85M | ﹤0.01% |
4,500
-2,000
| -31% | -$884K |
|
2145
CALL
Philips
PHG
$25.4B
| $1.85M | ﹤0.01% |
103,521
+23,029
| +29% | +$442K |
|
|
BBBY
2146
PUT
Bed Bath & Beyond
BBBY
$473M
| $1.84M | ﹤0.01% |
128,260
-268,290
| -68% | -$6.57M |
|
2147
iShares MSCI China ETF
MCHI
$6.04B
| $1.84M | ﹤0.01% |
42,506
+5,333
| +14% | +$242K |
|
|
DM
2148
DELISTED
Desktop Metal, Inc.
DM
| $1.84M | ﹤0.01% |
126,057
-14,147
| -10% | -$235K |
|
2149
CALL
Burford Capital
BUR
$907M
| $1.83M | ﹤0.01% |
130,800
+81,400
| +165% | +$1.11M |
|
2150
CALL
Middleby
MIDD
$6.05B
| $1.83M | ﹤0.01% |
14,300
-16,500
| -54% | -$2.34M |
|
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.