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 | |
|---|---|---|---|---|---|---|
3201
PUT
Gulfport Energy Corp
GPOR
$2.77B
| $605K | ﹤0.01% |
5,100
+100
| +2% | +$11.1K |
|
3202
CALL
NETGEAR
NTGR
$681M
| $605K | ﹤0.01% |
+48,100
| New | +$638K |
|
3203
CALL
Shoals Technologies Group
SHLS
$1.57B
| $605K | ﹤0.01% |
33,200
-22,000
| -40% | -$490K |
|
3204
Beam Therapeutics
BEAM
$2.58B
| $604K | ﹤0.01% |
25,117
+21,622
| +619% | +$580K |
|
3205
PUT
nVent Electric
NVT
$24.1B
| $604K | ﹤0.01% |
+11,400
| New | +$615K |
|
3206
PUT
Gen Digital
GEN
$16.1B
| $602K | ﹤0.01% |
34,100
-32,400
| -49% | -$632K |
|
3207
CALL
International Bancshares
IBOC
$4.77B
| $602K | ﹤0.01% |
+13,900
| New | +$636K |
|
3208
PUT
Liberty Global Class C
LBTYK
$3.27B
| $602K | ﹤0.01% |
35,200
+19,500
| +124% | +$375K |
|
|
SBDS
3209
PUT
DELISTED
Solo Brands Inc
SBDS
| $602K | ﹤0.01% |
2,953
+45
| +2% | +$9.82K |
|
3210
PUT
RXO
RXO
$3.98B
| $601K | ﹤0.01% |
+30,500
| New | +$601K |
|
|
TE
3211
CALL
T1 Energy
TE
$1.37B
| $600K | ﹤0.01% |
122,800
+9,300
| +8% | +$66.9K |
|
3212
Harley-Davidson
HOG
$2.61B
| $599K | ﹤0.01% |
+18,148
| New | +$631K |
|
3213
Huntsman Corp
HUN
$2.06B
| $599K | ﹤0.01% |
24,581
-3,302
| -12% | -$89.5K |
|
3214
PUT
Mirion Technologies
MIR
$4.12B
| $598K | ﹤0.01% |
80,100
+79,600
| +15,920% | +$627K |
|
3215
CALL
Voya Financial
VOYA
$8.98B
| $598K | ﹤0.01% |
9,000
+8,100
| +900% | +$577K |
|
3216
CALL
Verra Mobility
VRRM
$636M
| $598K | ﹤0.01% |
32,000
-38,100
| -54% | -$739K |
|
3217
Algoma Steel
ASTL
$463M
| $596K | ﹤0.01% |
87,731
-102,016
| -54% | -$732K |
|
3218
CALL
Reinsurance Group of America
RGA
$15.7B
| $595K | ﹤0.01% |
4,100
+2,100
| +105% | +$298K |
|
|
SNV
3219
CALL
DELISTED
Synovus
SNV
| $594K | ﹤0.01% |
21,400
+15,000
| +234% | +$469K |
|
3220
Illinois Tool Works
ITW
$81.9B
| $593K | ﹤0.01% |
+2,577
| New | +$629K |
|
|
ONC
3221
PUT
BeOne Medicines Ltd
ONC
$33.8B
| $593K | ﹤0.01% |
3,300
-4,300
| -57% | -$851K |
|
3222
PUT
Cirrus Logic
CRUS
$6.87B
| $591K | ﹤0.01% |
8,000
-4,100
| -34% | -$320K |
|
|
HCP
3223
DELISTED
HashiCorp, Inc. Class A Common Stock
HCP
| $590K | ﹤0.01% |
25,846
-14,262
| -36% | -$387K |
|
|
GOEV
3224
CALL
DELISTED
Canoo Inc. Class A Common Stock
GOEV
| $590K | ﹤0.01% |
2,621
+259
| +11% | +$65.3K |
|
3225
CALL
Freshworks
FRSH
$2.99B
| $589K | ﹤0.01% |
29,600
-7,600
| -20% | -$151K |
|
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.