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 | |
|---|---|---|---|---|---|---|
126
PUT
Johnson & Johnson
JNJ
$612B
| $110M | 0.11% |
665,800
+660,057
| +11,493% | +$109M |
|
127
PUT
Peloton Interactive
PTON
$2.69B
| $108M | 0.1% |
871,600
+862,076
| +9,052% | +$91.8M |
|
128
PUT
Pinterest
PINS
$12.6B
| $107M | 0.1% |
1,353,800
+1,344,329
| +14,194% | +$93.7M |
|
129
CALL
State Street SPDR NYSE Technology ETF
XNTK
$2.15B
| $107M | 0.1% |
1,277,700
+1,262,378
| +8,239% | +$189M |
|
130
CALL
Booking.com
BKNG
$138B
| $106M | 0.1% |
+1,210,000
| New | +$113M |
|
131
PUT
Vanguard S&P 500 ETF
VOO
$979B
| $106M | 0.1% |
393,900
+392,391
| +26,003% | +$151M |
|
132
PUT
Costco
COST
$410B
| $105M | 0.1% |
+266,400
| New | +$101M |
|
133
PUT
AutoZone
AZO
$49.2B
| $105M | 0.1% |
70,100
+69,465
| +10,939% | +$101M |
|
134
CALL
ExxonMobil
XOM
$639B
| $104M | 0.1% |
+1,652,600
| New | +$98.7M |
|
135
PUT
Berkshire Hathaway Class B
BRK.B
$1.06T
| $103M | 0.1% |
+371,100
| New | +$104M |
|
136
PUT
Cisco
CSCO
$446B
| $103M | 0.1% |
1,937,300
+1,913,943
| +8,194% | +$101M |
|
137
CALL
State Street SPDR Portfolio Short Term Treasury ETF
SPTS
$6.07B
| $102M | 0.1% |
1,062,000
+1,053,405
| +12,256% | +$32.3M |
|
138
PUT
Lowe's Companies
LOW
$114B
| $100M | 0.1% |
+515,400
| New | +$101M |
|
139
CALL
Pinduoduo
PDD
$119B
| $99.6M | 0.1% |
784,100
+782,154
| +40,193% | +$102M |
|
140
CALL
Moderna
MRNA
$23.4B
| $99.1M | 0.1% |
421,900
+418,431
| +12,062% | +$74.8M |
|
141
CALL
Snap
SNAP
$7.57B
| $98.7M | 0.1% |
1,448,800
+1,425,903
| +6,227% | +$85.6M |
|
142
CALL
Caterpillar
CAT
$412B
| $98.1M | 0.09% |
450,900
+447,346
| +12,587% | +$103M |
|
143
PUT
CrowdStrike
CRWD
$193B
| $98.1M | 0.09% |
1,560,800
+1,553,480
| +21,222% | +$83.6M |
|
|
144
PUT
AT&T
T
$159B
| $97.6M | 0.09% |
4,489,816
+4,471,889
| +24,945% | +$102M |
|
|
145
CALL
AT&T
T
$159B
| $97.4M | 0.09% |
4,482,932
+4,444,778
| +11,650% | +$101M |
|
146
CALL
United States Oil Fund
USO
$2.38B
| $96.8M | 0.09% |
+1,941,100
| New | +$87.6M |
|
|
147
PUT
Caterpillar
CAT
$412B
| $96.3M | 0.09% |
442,600
+438,215
| +9,994% | +$101M |
|
|
148
PUT
ExxonMobil
XOM
$639B
| $95.5M | 0.09% |
+1,514,300
| New | +$90.4M |
|
149
PUT
Nike
NKE
$61.8B
| $95.5M | 0.09% |
618,100
+612,755
| +11,464% | +$82.5M |
|
150
PUT
Lam Research
LRCX
$399B
| $94.4M | 0.09% |
1,451,000
+1,443,520
| +19,298% | +$91.1M |
|
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.