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 | |
|---|---|---|---|---|---|---|
126
CALL
State Street SPDR NYSE Technology ETF
XNTK
$2.16B
| $113M | 0.11% |
1,319,100
+41,400
| +3% | +$6.62M |
|
127
PUT
JD.com
JD
$41.1B
| $113M | 0.11% |
1,453,000
+73,100
| +5% | +$5.39M |
|
128
PUT
Johnson & Johnson
JNJ
$603B
| $112M | 0.11% |
677,300
+11,500
| +2% | +$1.96M |
|
129
PUT
Berkshire Hathaway Class B
BRK.B
$1.06T
| $111M | 0.1% |
396,400
+25,300
| +7% | +$7.11M |
|
130
PUT
Costco
COST
$412B
| $111M | 0.1% |
280,100
+13,700
| +5% | +$6.02M |
|
131
PUT
IBM
IBM
$198B
| $110M | 0.1% |
784,709
-4,916
| -0.6% | -$657K |
|
132
PUT
Lam Research
LRCX
$403B
| $110M | 0.1% |
1,732,000
+281,000
| +19% | +$17.1M |
|
133
CALL
State Street SPDR Portfolio Short Term Treasury ETF
SPTS
$6.07B
| $108M | 0.1% |
1,095,700
+33,700
| +3% | +$1.03M |
|
134
CALL
Booking.com
BKNG
$139B
| $107M | 0.1% |
1,210,000
| – | – |
|
135
PUT
AutoZone
AZO
$49.2B
| $107M | 0.1% |
70,100
| – | – |
|
136
PUT
Vanguard S&P 500 ETF
VOO
$981B
| $107M | 0.1% |
394,200
+300
| +0.1% | +$122K |
|
137
PUT
Cisco
CSCO
$442B
| $105M | 0.1% |
1,960,200
+22,900
| +1% | +$1.28M |
|
138
PUT
ExxonMobil
XOM
$629B
| $105M | 0.1% |
1,652,900
+138,600
| +9% | +$7.9M |
|
|
139
CALL
ExxonMobil
XOM
$629B
| $104M | 0.1% |
1,647,100
-5,500
| -0.3% | -$313K |
|
140
PUT
Caterpillar
CAT
$410B
| $103M | 0.1% |
473,600
+31,000
| +7% | +$6.46M |
|
141
PUT
CrowdStrike
CRWD
$195B
| $102M | 0.1% |
1,632,400
+71,600
| +5% | +$4.62M |
|
|
142
CALL
Caterpillar
CAT
$410B
| $102M | 0.1% |
471,400
+20,500
| +5% | +$4.27M |
|
143
CALL
Moderna
MRNA
$23.7B
| $102M | 0.09% |
432,400
+10,500
| +2% | +$3.87M |
|
144
PUT
Lowe's Companies
LOW
$114B
| $101M | 0.09% |
513,900
-1,500
| -0.3% | -$299K |
|
145
CALL
United States Oil Fund
USO
$2.31B
| $101M | 0.09% |
1,985,600
+44,500
| +2% | +$2.18M |
|
146
CALL
Pinduoduo
PDD
$121B
| $99.7M | 0.09% |
818,200
+34,100
| +4% | +$3.32M |
|
147
CALL
United Airlines
UAL
$38.2B
| $99M | 0.09% |
1,866,000
+68,000
| +4% | +$3.2M |
|
148
PUT
AT&T
T
$155B
| $97.9M | 0.09% |
4,453,804
-36,012
| -0.8% | -$757K |
|
|
149
CALL
AT&T
T
$155B
| $97M | 0.09% |
4,411,171
-71,761
| -2% | -$1.51M |
|
150
CALL
Uber
UBER
$146B
| $95.8M | 0.09% |
1,894,400
+91,800
| +5% | +$4.01M |
|
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.