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 |
GE Aerospace
GE
|
+$36M |
| 2 |
Advanced Micro Devices
AMD
|
+$19.4M |
| 3 |
iShares MSCI EAFE ETF
EFA
|
+$10.2M |
| 4 |
Micron Technology
MU
|
+$6.31M |
| 5 |
Alibaba
BABA
|
+$6.19M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$25.9M |
| 2 |
SPDR Gold Trust
GLD
|
+$15.3M |
| 3 |
Amazon
AMZN
|
+$9.53M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$9.03M |
| 5 |
State Street Technology Select Sector SPDR ETF
XLK
|
+$7.73M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.49% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.25% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1226
PUT
Lumen
LUMN
$6.73B
| $4.91M | ﹤0.01% |
357,000
-4,000
| -1% | -$50.1K |
|
1227
CALL
Atmos Energy
ATO
$29.8B
| $4.9M | ﹤0.01% |
50,500
| – | – |
|
1228
PUT
Royal Gold
RGLD
$17.2B
| $4.89M | ﹤0.01% |
42,700
| – | – |
|
1229
CALL
Cadence Design Systems
CDNS
$91.8B
| $4.89M | ﹤0.01% |
35,700
| – | – |
|
1230
CALL
Chubb
CB
$139B
| $4.89M | ﹤0.01% |
30,200
+500
| +2% | +$87.6K |
|
1231
PUT
Apollo Global Management
APO
$70.4B
| $4.88M | ﹤0.01% |
77,500
+7,200
| +10% | +$433K |
|
1232
PUT
Tyler Technologies
TYL
$12.3B
| $4.87M | ﹤0.01% |
10,600
| – | – |
|
1233
PUT
HubSpot
HUBS
$10.3B
| $4.86M | ﹤0.01% |
8,300
+100
| +1% | +$64.4K |
|
|
K
1234
PUT
DELISTED
Kellanova
K
| $4.85M | ﹤0.01% |
80,727
| – | – |
|
1235
Lam Research
LRCX
$392B
| $4.85M | ﹤0.01% |
76,590
-6,000
| -7% | -$365K |
|
1236
CALL
Butterfly Network
BFLY
$1.75B
| $4.85M | ﹤0.01% |
340,200
-7,600
| -2% | -$87.8K |
|
1237
CALL
Huntington Ingalls Industries
HII
$11.4B
| $4.84M | ﹤0.01% |
22,800
+800
| +4% | +$162K |
|
1238
CALL
Immunovant
IMVT
$8.09B
| $4.83M | ﹤0.01% |
425,200
-9,200
| -2% | -$83K |
|
|
SBNY
1239
DELISTED
Signature Bank
SBNY
| $4.83M | ﹤0.01% |
19,322
+200
| +1% | +$50.2K |
|
|
FTCH
1240
DELISTED
Farfetch Limited Class A Ordinary Shares
FTCH
| $4.82M | ﹤0.01% |
95,131
-4,266
| -4% | -$189K |
|
|
KL
1241
PUT
DELISTED
Kirkland Lake Gold Ltd Ordinary
KL
| $4.82M | ﹤0.01% |
125,500
-800
| -0.6% | -$32.5K |
|
1242
ASML
ASML
$684B
| $4.81M | ﹤0.01% |
7,087
-422
| -6% | -$332K |
|
1243
CALL
Open Text
OTEX
$5.38B
| $4.81M | ﹤0.01% |
93,500
| – | – |
|
1244
Direxion Daily Technology Bull 3x ETF
TECL
$5.38B
| $4.79M | ﹤0.01% |
85,943
-140
| -0.2% | -$8.82K |
|
1245
PUT
Church & Dwight Co
CHD
$23B
| $4.78M | ﹤0.01% |
56,300
-100
| -0.2% | -$8.48K |
|
1246
PUT
STAAR Surgical
STAA
$1.2B
| $4.78M | ﹤0.01% |
31,600
+11,100
| +54% | +$1.55M |
|
1247
PUT
Opendoor
OPEN
$3.81B
| $4.76M | ﹤0.01% |
288,093
+1,033
| +0.4% | +$16.7K |
|
1248
CALL
Copart
CPRT
$25.9B
| $4.76M | ﹤0.01% |
141,600
| – | – |
|
1249
CALL
Exelon
EXC
$48.5B
| $4.74M | ﹤0.01% |
147,631
-140
| -0.1% | -$4.78K |
|
1250
CALL
Qorvo
QRVO
$7.67B
| $4.73M | ﹤0.01% |
24,500
+1,000
| +4% | +$186K |
|
Similar funds
Simplex Trading's Q3 2021 Portfolio in Review
As of Q3 2021, Simplex Trading held 10,062 positions worth $107B, up 3.4% from $104B the previous quarter. Its ten largest holdings account for 41% of the portfolio.
Trading was light in Q3 2021: portfolio turnover was 3.5%. Simplex Trading opened 86 new positions and exited 271, leaving the 10,062-position portfolio largely intact.
By sector, the portfolio is most concentrated in Technology at 0.49% of assets, up from 0.47% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q3 2021 buy was Olo Inc: 143,230 shares worth $4.91M.
- Simplex Trading added most to GE Aerospace in Q3 2021, an estimated $36M increase.
- Simplex Trading's biggest Q3 2021 reduction was NVIDIA, cutting an estimated $25.9M.
- Simplex Trading fully exited Amazon in Q3 2021, selling an estimated $9.53M.
- Simplex Trading's ten largest holdings make up 41% of its $107B portfolio in Q3 2021.
- Simplex Trading opened 86 new positions and closed 271 in Q3 2021.
- Simplex Trading's portfolio value rose 3.4% quarter-over-quarter to $107B.
Based on Simplex Trading's 13F filing for Q3 2021, filed 28 Oct 2021.