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 | |
|---|---|---|---|---|---|---|
1126
CALL
Microchip Technology
MCHP
$44.2B
| $5.43M | 0.01% |
73,600
| – | – |
|
1127
PUT
Zoetis
ZTS
$31.3B
| $5.43M | 0.01% |
28,700
| – | – |
|
1128
Editas Medicine
EDIT
$419M
| $5.42M | 0.01% |
95,876
+423
| +0.4% | +$23.2K |
|
1129
CALL
Groupon
GRPN
$966M
| $5.4M | 0.01% |
121,500
+500
| +0.4% | +$14.8K |
|
1130
CALL
Diageo
DEO
$45.7B
| $5.39M | 0.01% |
28,100
-100
| -0.4% | -$19.4K |
|
|
MMP
1131
CALL
DELISTED
Magellan Midstream Partners, L.P.
MMP
| $5.39M | 0.01% |
110,000
-2,000
| -2% | -$95.1K |
|
1132
PUT
Qorvo
QRVO
$7.65B
| $5.39M | 0.01% |
27,900
+400
| +1% | +$74.3K |
|
1133
CALL
Stem
STEM
$52M
| $5.39M | 0.01% |
7,280
+1,040
| +17% | +$547K |
|
|
1134
GE Aerospace
GE
$362B
| $5.37M | 0.01% |
639,837
+559,961
| +701% | +$36M |
|
1135
CALL
International Paper
IP
$20.1B
| $5.37M | 0.01% |
92,189
-528
| -0.6% | -$29.4K |
|
1136
CALL
Canadian Pacific Kansas City
CP
$82B
| $5.37M | 0.01% |
70,000
+200
| +0.3% | +$14.3K |
|
|
AVLR
1137
PUT
DELISTED
Avalara, Inc.
AVLR
| $5.37M | 0.01% |
33,300
| – | – |
|
1138
CALL
AutoNation
AN
$6.86B
| $5.36M | 0.01% |
54,700
-2,500
| -4% | -$282K |
|
1139
PUT
DaVita
DVA
$15B
| $5.36M | 0.01% |
43,800
+500
| +1% | +$62.6K |
|
1140
PUT
New Oriental
EDU
$7.85B
| $5.36M | 0.01% |
68,610
+2,080
| +3% | +$66K |
|
1141
PUT
General Mills
GIS
$19B
| $5.35M | 0.01% |
88,900
+1,500
| +2% | +$88.6K |
|
1142
Caterpillar
CAT
$412B
| $5.35M | 0.01% |
24,701
-2,034
| -8% | -$424K |
|
1143
CALL
AutoZone
AZO
$47.7B
| $5.34M | 0.01% |
3,500
| – | – |
|
1144
CALL
Dominion Energy
D
$62.8B
| $5.33M | 0.01% |
72,000
+6,800
| +10% | +$519K |
|
|
IAA
1145
CALL
DELISTED
IAA, Inc. Common Stock
IAA
| $5.33M | 0.01% |
93,800
-100
| -0.1% | -$5.54K |
|
1146
CALL
Canadian Imperial Bank of Commerce
CM
$106B
| $5.31M | 0.01% |
92,400
+2,200
| +2% | +$127K |
|
1147
CALL
KB Home
KBH
$3.41B
| $5.3M | 0.01% |
126,800
-2,500
| -2% | -$104K |
|
1148
PUT
Baker Hughes
BKR
$55.6B
| $5.3M | 0.01% |
225,300
+59,600
| +36% | +$1.33M |
|
1149
Atlassian
TEAM
$20.3B
| $5.3M | 0.01% |
20,509
-1,200
| -6% | -$401K |
|
1150
PUT
Credit Acceptance
CACC
$6.2B
| $5.3M | ﹤0.01% |
11,700
| – | – |
|
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.