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 | |
|---|---|---|---|---|---|---|
1251
PUT
New York Times
NYT
$11.6B
| $4.73M | ﹤0.01% |
106,700
| – | – |
|
|
LEV
1252
PUT
DELISTED
The Lion Electric Company
LEV
| $4.73M | ﹤0.01% |
241,800
-100
| -0% | -$1.4K |
|
1253
PUT
Citizens Financial Group
CFG
$30.4B
| $4.72M | ﹤0.01% |
101,700
+100
| +0.1% | +$4.39K |
|
1254
CALL
Royal Gold
RGLD
$17.1B
| $4.72M | ﹤0.01% |
41,200
+2,500
| +6% | +$280K |
|
1255
CarMax
KMX
$8.35B
| $4.72M | ﹤0.01% |
36,119
-200
| -0.6% | -$26.6K |
|
|
SI
1256
CALL
DELISTED
Silvergate Capital Corporation
SI
| $4.71M | ﹤0.01% |
43,000
-200
| -0.5% | -$21.4K |
|
1257
CALL
Progressive
PGR
$123B
| $4.7M | ﹤0.01% |
47,600
+300
| +0.6% | +$28.6K |
|
1258
PUT
SBA Communications
SBAC
$18.6B
| $4.7M | ﹤0.01% |
14,700
+200
| +1% | +$69.2K |
|
1259
PUT
Natera
NTRA
$37.8B
| $4.69M | ﹤0.01% |
40,400
| – | – |
|
1260
CALL
Itaú Unibanco
ITUB
$91.5B
| $4.68M | ﹤0.01% |
1,100,150
+14,018
| +1% | +$57.4K |
|
1261
CALL
Procore
PCOR
$6.42B
| $4.68M | ﹤0.01% |
50,300
+200
| +0.4% | +$18.9K |
|
1262
CALL
Bunge Global
BG
$23.7B
| $4.67M | ﹤0.01% |
58,800
+1,100
| +2% | +$84.9K |
|
1263
PUT
Hydrofarm Holdings
HYFM
$3.19M
| $4.67M | ﹤0.01% |
8,250
+830
| +11% | +$403K |
|
1264
Energy Transfer Partners
ET
$70.2B
| $4.66M | ﹤0.01% |
435,411
-4,900
| -1% | -$47K |
|
1265
CALL
Ternium
TX
$9.3B
| $4.66M | ﹤0.01% |
120,000
+200
| +0.2% | +$9.77K |
|
1266
CALL
State Street SPDR Portfolio Europe ETF
SPEU
$714M
| $4.65M | ﹤0.01% |
98,600
-100
| -0.1% | -$4.26K |
|
1267
PUT
Pan American Silver
PAAS
$18.7B
| $4.64M | ﹤0.01% |
163,500
+1,000
| +0.6% | +$26.1K |
|
|
HUYA
1268
PUT
Huya Inc
HUYA
$556M
| $4.64M | ﹤0.01% |
269,200
| – | – |
|
|
SAVE
1269
PUT
DELISTED
Spirit Airlines, Inc.
SAVE
| $4.64M | ﹤0.01% |
148,400
+6,700
| +5% | +$176K |
|
1270
Cboe Global Markets
CBOE
$29.6B
| $4.64M | ﹤0.01% |
39,143
+100
| +0.3% | +$12.2K |
|
1271
CALL
L3Harris
LHX
$56B
| $4.63M | ﹤0.01% |
21,200
| – | – |
|
1272
CALL
Invesco CurrencyShares Canadian Dollar Trust
FXC
$69.3M
| $4.62M | ﹤0.01% |
58,600
+100
| +0.2% | +$7.79K |
|
1273
CALL
Synchrony
SYF
$23.6B
| $4.62M | ﹤0.01% |
94,600
-100
| -0.1% | -$4.86K |
|
1274
CALL
United Therapeutics
UTHR
$26.4B
| $4.62M | ﹤0.01% |
25,000
+100
| +0.4% | +$19.7K |
|
|
WWE
1275
CALL
DELISTED
World Wrestling Entertainment
WWE
| $4.62M | ﹤0.01% |
79,100
+9,100
| +13% | +$474K |
|
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.