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 | |
|---|---|---|---|---|---|---|
|
1
PUT
State Street SPDR S&P 500 ETF Trust
SPY
$787B
| $12.7B | 11.84% |
29,462,600
+1,135,700
| +4% | +$501M |
|
|
2
CALL
State Street SPDR S&P 500 ETF Trust
SPY
$787B
| $5.55B | 5.18% |
12,894,400
+248,000
| +2% | +$109M |
|
3
PUT
Tesla
TSLA
$1.42T
| $5.35B | 5% |
23,675,400
+1,218,600
| +5% | +$287M |
|
4
PUT
Invesco QQQ Trust
QQQ
$471B
| $3.86B | 3.6% |
10,883,200
+828,800
| +8% | +$305M |
|
5
PUT
iShares S&P 100 ETF
OEF
$20.2B
| $3.58B | 3.34% |
23,255,600
+711,700
| +3% | +$145M |
|
|
6
CALL
Tesla
TSLA
$1.42T
| $3.29B | 3.08% |
14,577,600
+485,400
| +3% | +$114M |
|
|
7
PUT
Amazon
AMZN
$2.66T
| $2.44B | 2.28% |
14,222,000
+288,000
| +2% | +$49.7M |
|
|
8
CALL
Invesco QQQ Trust
QQQ
$471B
| $2.4B | 2.24% |
6,761,300
+638,000
| +10% | +$235M |
|
|
9
CALL
Amazon
AMZN
$2.66T
| $2.24B | 2.09% |
13,026,000
+1,502,000
| +13% | +$259M |
|
10
CALL
Apple
AAPL
$4.81T
| $2B | 1.87% |
14,585,100
+805,600
| +6% | +$119M |
|
|
11
PUT
Apple
AAPL
$4.81T
| $1.75B | 1.63% |
12,725,400
+140,000
| +1% | +$20.6M |
|
|
12
CALL
iShares S&P 100 ETF
OEF
$20.2B
| $1.65B | 1.54% |
12,785,300
+205,000
| +2% | +$41.6M |
|
13
PUT
State Street Materials Select Sector SPDR ETF
XLB
$8.31B
| $1B | 0.94% |
31,506,600
-207,800
| -0.7% | -$8.64M |
|
|
14
PUT
NVIDIA
NVDA
$5.02T
| $986M | 0.92% |
12,192,000
-33,972,000
| -74% | -$705M |
|
|
15
CALL
State Street Materials Select Sector SPDR ETF
XLB
$8.31B
| $941M | 0.88% |
29,313,000
+825,400
| +3% | +$34.3M |
|
|
16
CALL
Alibaba
BABA
$283B
| $867M | 0.81% |
3,909,800
+301,900
| +8% | +$54.9M |
|
17
PUT
Meta Platforms (Facebook)
META
$1.63T
| $860M | 0.8% |
2,427,900
+76,900
| +3% | +$27.7M |
|
18
PUT
GameStop
GME
$9.78B
| $858M | 0.8% |
16,798,400
+6,000
| +0% | +$274K |
|
|
19
CALL
Meta Platforms (Facebook)
META
$1.63T
| $813M | 0.76% |
2,295,100
-44,800
| -2% | -$16.1M |
|
|
20
CALL
NVIDIA
NVDA
$5.02T
| $804M | 0.75% |
9,946,000
-30,010,000
| -75% | -$623M |
|
21
PUT
Alphabet (Google) Class A
GOOGL
$4.24T
| $789M | 0.74% |
6,330,000
+234,000
| +4% | +$31.8M |
|
22
PUT
AMC Entertainment Holdings
AMC
$1.96B
| $786M | 0.73% |
1,449,170
+27,280
| +2% | +$11M |
|
|
23
PUT
SPDR Gold Trust
GLD
$132B
| $710M | 0.66% |
4,270,900
+96,200
| +2% | +$16.1M |
|
24
PUT
Microsoft
MSFT
$2.95T
| $684M | 0.64% |
2,517,100
-9,700
| -0.4% | -$2.82M |
|
|
25
CALL
SPDR Gold Trust
GLD
$132B
| $647M | 0.6% |
3,890,800
+170,800
| +5% | +$28.6M |
|
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.