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 | |
|---|---|---|---|---|---|---|
|
GRMN
2226
CALL
Garmin
GRMN
$46.9B
| $1.68M | ﹤0.01% |
16,000
-15,100
| -49% | -$1.59M |
|
2227
iShare MSCI Eurozone ETF
EZU
$9.41B
| $1.68M | ﹤0.01% |
+39,779
| New | +$1.78M |
|
2228
PUT
Nano X Imaging
NNOX
$62.4M
| $1.68M | ﹤0.01% |
255,800
+102,900
| +67% | +$1.06M |
|
2229
State Street SPDR S&P 500 ETF Trust
SPY
$778B
| $1.68M | ﹤0.01% |
+3,925
| New | +$1.75M |
|
2230
NCR Voyix
VYX
$1.06B
| $1.67M | ﹤0.01% |
101,130
+37,369
| +59% | +$636K |
|
2231
Banc of California
BANC
$3.28B
| $1.67M | ﹤0.01% |
+135,091
| New | +$1.72M |
|
2232
Glaukos
GKOS
$9.02B
| $1.67M | ﹤0.01% |
22,193
+4,412
| +25% | +$329K |
|
2233
CALL
FuboTV Inc
FUBO
$245M
| $1.67M | ﹤0.01% |
52,117
+18,734
| +56% | +$580K |
|
2234
PUT
ICICI Bank
IBN
$106B
| $1.67M | ﹤0.01% |
72,200
-9,500
| -12% | -$223K |
|
2235
PUT
Sundial Growers
SNDL
$324M
| $1.67M | ﹤0.01% |
877,700
+203,700
| +30% | +$343K |
|
2236
CALL
Doximity
DOCS
$3.67B
| $1.67M | ﹤0.01% |
78,500
-20,800
| -21% | -$568K |
|
2237
PUT
Huntsman Corp
HUN
$2.24B
| $1.66M | ﹤0.01% |
68,200
+9,800
| +17% | +$266K |
|
2238
CALL
Ultragenyx Pharmaceutical
RARE
$2.65B
| $1.66M | ﹤0.01% |
46,700
+7,600
| +19% | +$301K |
|
2239
CALL
STAAR Surgical
STAA
$1.16B
| $1.66M | ﹤0.01% |
41,400
+31,700
| +327% | +$1.48M |
|
2240
Cheesecake Factory
CAKE
$4.21B
| $1.66M | ﹤0.01% |
54,704
+39,043
| +249% | +$1.3M |
|
|
LAZR
2241
PUT
DELISTED
Luminar Technologies
LAZR
| $1.66M | ﹤0.01% |
24,260
-31,127
| -56% | -$2.85M |
|
2242
Acadia Pharmaceuticals
ACAD
$4.25B
| $1.65M | ﹤0.01% |
+79,388
| New | +$2.16M |
|
2243
PUT
HEICO Corp Class A
HEI.A
$35.4B
| $1.65M | ﹤0.01% |
10,200
+4,200
| +70% | +$569K |
|
2244
PUT
Sigma Lithium
SGML
$1.08B
| $1.65M | ﹤0.01% |
50,900
+47,300
| +1,314% | +$1.69M |
|
2245
PUT
Hain Celestial
HAIN
$47.8M
| $1.65M | ﹤0.01% |
158,700
+158,600
| +158,600% | +$1.83M |
|
2246
CME Group
CME
$92.2B
| $1.64M | ﹤0.01% |
+8,213
| New | +$1.63M |
|
2247
MasTec
MTZ
$26.7B
| $1.64M | ﹤0.01% |
+22,841
| New | +$2.28M |
|
2248
PUT
Weyerhaeuser
WY
$17.3B
| $1.64M | ﹤0.01% |
53,600
+2,300
| +4% | +$75.7K |
|
|
SAVE
2249
PUT
DELISTED
Spirit Airlines, Inc.
SAVE
| $1.64M | ﹤0.01% |
99,500
+34,000
| +52% | +$579K |
|
|
2250
CALL
Cheesecake Factory
CAKE
$4.21B
| $1.63M | ﹤0.01% |
53,900
-2,500
| -4% | -$83.3K |
|
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.