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 |
AMC Entertainment Holdings
AMC
|
+$39.3M |
| 2 |
AT&T
T
|
+$29.8M |
| 3 |
NVIDIA
NVDA
|
+$28.3M |
| 4 |
Micron Technology
MU
|
+$22.9M |
| 5 |
Baidu
BIDU
|
+$22.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco QQQ Trust
QQQ
|
+$36.1M |
| 2 |
Tesla
TSLA
|
+$35.2M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$25.9M |
| 4 |
Palantir
PLTR
|
+$25.7M |
| 5 |
Wells Fargo
WFC
|
+$20.4M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.47% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.26% |
| 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
| $12.1B | 11.71% |
28,326,900
+28,072,023
| +11,014% | +$11.7B |
|
|
2
CALL
State Street SPDR S&P 500 ETF Trust
SPY
$787B
| $5.41B | 5.23% |
12,646,400
+12,538,226
| +11,591% | +$5.23B |
|
|
3
PUT
Tesla
TSLA
$1.42T
| $5.09B | 4.91% |
+22,456,800
| New | +$4.88B |
|
|
4
PUT
Invesco QQQ Trust
QQQ
$471B
| $3.56B | 3.44% |
+10,054,400
| New | +$3.38B |
|
5
PUT
iShares S&P 100 ETF
OEF
$20.2B
| $3.47B | 3.35% |
22,543,900
+22,308,779
| +9,488% | +$4.24B |
|
|
6
CALL
Tesla
TSLA
$1.42T
| $3.19B | 3.08% |
+14,092,200
| New | +$3.06B |
|
7
PUT
Amazon
AMZN
$2.66T
| $2.4B | 2.32% |
13,934,000
+13,813,400
| +11,454% | +$2.3B |
|
|
8
CALL
Invesco QQQ Trust
QQQ
$471B
| $2.17B | 2.1% |
+6,123,300
| New | +$2.06B |
|
|
9
CALL
Amazon
AMZN
$2.66T
| $1.98B | 1.91% |
11,524,000
+11,385,540
| +8,223% | +$1.89B |
|
10
CALL
Apple
AAPL
$4.81T
| $1.89B | 1.82% |
13,779,500
+13,646,623
| +10,270% | +$1.77B |
|
|
11
PUT
Apple
AAPL
$4.81T
| $1.72B | 1.67% |
12,585,400
+12,466,371
| +10,473% | +$1.62B |
|
|
12
CALL
iShares S&P 100 ETF
OEF
$20.2B
| $1.62B | 1.57% |
12,580,300
+12,424,063
| +7,952% | +$2.36B |
|
13
PUT
State Street Materials Select Sector SPDR ETF
XLB
$8.31B
| $991M | 0.96% |
31,714,400
+31,472,730
| +13,023% | +$1.33B |
|
|
14
PUT
NVIDIA
NVDA
$5.02T
| $923M | 0.89% |
+46,164,000
| New | +$740M |
|
|
15
CALL
State Street Materials Select Sector SPDR ETF
XLB
$8.31B
| $902M | 0.87% |
28,487,600
+28,281,270
| +13,707% | +$1.19B |
|
16
PUT
GameStop
GME
$9.78B
| $899M | 0.87% |
+16,792,400
| New | +$815M |
|
17
CALL
Alibaba
BABA
$283B
| $818M | 0.79% |
+3,607,900
| New | +$802M |
|
18
PUT
Meta Platforms (Facebook)
META
$1.63T
| $817M | 0.79% |
2,351,000
+2,330,839
| +11,561% | +$748M |
|
|
19
CALL
Meta Platforms (Facebook)
META
$1.63T
| $814M | 0.79% |
2,339,900
+2,315,474
| +9,480% | +$743M |
|
|
20
PUT
AMC Entertainment Holdings
AMC
$1.96B
| $806M | 0.78% |
+1,421,890
| New | +$377M |
|
|
21
CALL
NVIDIA
NVDA
$5.02T
| $799M | 0.77% |
+39,956,000
| New | +$640M |
|
22
PUT
Alphabet (Google) Class A
GOOGL
$4.24T
| $755M | 0.73% |
6,096,000
+6,047,800
| +12,547% | +$706M |
|
23
PUT
SPDR Gold Trust
GLD
$132B
| $691M | 0.67% |
4,174,700
+4,138,076
| +11,299% | +$703M |
|
24
PUT
Microsoft
MSFT
$2.95T
| $685M | 0.66% |
2,526,800
+2,501,399
| +9,848% | +$636M |
|
|
25
PUT
Alibaba
BABA
$283B
| $652M | 0.63% |
+2,874,700
| New | +$639M |
|
Similar funds
Simplex Trading's Q2 2021 Portfolio in Review
As of Q2 2021, Simplex Trading held 11,184 positions worth $104B, up 86% from $55.7B the previous quarter. Its ten largest holdings account for 40% of the portfolio.
Simplex Trading deployed $97.5B of net new capital in Q2 2021, opening 2,250 new positions and adding to 6,673 existing holdings. Its largest new stake was AT&T: 1,311,180 shares worth $28.5M.
By sector, the portfolio is most concentrated in Technology at 0.47% of assets, down from 0.65% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, an estimated $25.9M trimmed.
- Simplex Trading's largest Q2 2021 buy was AT&T: 1,311,180 shares worth $28.5M.
- Simplex Trading added most to AMC Entertainment Holdings in Q2 2021, an estimated $39.3M increase.
- Simplex Trading's biggest Q2 2021 reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, cutting an estimated $25.9M.
- Simplex Trading fully exited Invesco QQQ Trust in Q2 2021, selling an estimated $36.1M.
- Simplex Trading's ten largest holdings make up 40% of its $104B portfolio in Q2 2021.
- Simplex Trading opened 2,250 new positions and closed 1,197 in Q2 2021.
- Simplex Trading's portfolio value rose 86% quarter-over-quarter to $104B.
Based on Simplex Trading's 13F filing for Q2 2021, filed 12 Aug 2021.