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 | |
|---|---|---|---|---|---|---|
1201
CALL
Bumble
BMBL
$370M
| $4.95M | ﹤0.01% |
85,900
+85,659
| +35,543% | +$4.52M |
|
1202
PUT
Deutsche Bank
DB
$66.3B
| $4.94M | ﹤0.01% |
377,800
+375,657
| +17,529% | +$5.1M |
|
1203
Royal Caribbean
RCL
$78.4B
| $4.93M | ﹤0.01% |
57,834
-31,769
| -35% | -$2.77M |
|
1204
PUT
Opendoor
OPEN
$3.74B
| $4.92M | ﹤0.01% |
287,060
+283,702
| +8,449% | +$4.88M |
|
1205
Align Technology
ALGN
$12.1B
| $4.92M | ﹤0.01% |
8,059
+8,056
| +268,533% | +$4.77M |
|
1206
PUT
Pool Corp
POOL
$6.64B
| $4.91M | ﹤0.01% |
10,700
+10,683
| +62,841% | +$4.5M |
|
1207
PUT
Lumen
LUMN
$6.55B
| $4.91M | ﹤0.01% |
+361,000
| New | +$4.98M |
|
|
PENG
1208
PUT
Penguin Solutions Inc
PENG
$2.74B
| $4.9M | ﹤0.01% |
205,600
+205,572
| +734,186% | +$4.95M |
|
1209
CALL
W.P. Carey
WPC
$17B
| $4.89M | ﹤0.01% |
66,978
+66,718
| +25,661% | +$4.88M |
|
|
SI
1210
CALL
DELISTED
Silvergate Capital Corporation
SI
| $4.89M | ﹤0.01% |
43,200
+43,024
| +24,445% | +$4.87M |
|
1211
PUT
Cardinal Health
CAH
$53.3B
| $4.89M | ﹤0.01% |
+85,600
| New | +$5M |
|
1212
CALL
Cadence Design Systems
CDNS
$91.4B
| $4.88M | ﹤0.01% |
35,700
+34,999
| +4,993% | +$4.64M |
|
|
K
1213
PUT
DELISTED
Kellanova
K
| $4.88M | ﹤0.01% |
80,727
+79,612
| +7,140% | +$4.84M |
|
1214
PUT
Royal Gold
RGLD
$17B
| $4.87M | ﹤0.01% |
42,700
+42,167
| +7,911% | +$4.97M |
|
|
KL
1215
PUT
DELISTED
Kirkland Lake Gold Ltd Ordinary
KL
| $4.87M | ﹤0.01% |
126,300
+124,504
| +6,932% | +$4.99M |
|
1216
CALL
Atmos Energy
ATO
$29.8B
| $4.85M | ﹤0.01% |
50,500
+50,433
| +75,273% | +$5.06M |
|
1217
PUT
Synchrony
SYF
$23.6B
| $4.85M | ﹤0.01% |
99,900
+99,285
| +16,144% | +$4.52M |
|
|
SIVB
1218
CALL
DELISTED
SVB Financial Group
SIVB
| $4.84M | ﹤0.01% |
8,700
+8,643
| +15,163% | +$4.79M |
|
1219
CALL
Bread Financial
BFH
$4.16B
| $4.81M | ﹤0.01% |
57,889
+57,686
| +28,417% | +$5.22M |
|
1220
VanEck Junior Gold Miners ETF
GDXJ
$7.03B
| $4.81M | ﹤0.01% |
102,945
+72,487
| +238% | +$3.66M |
|
1221
PUT
Church & Dwight Co
CHD
$23B
| $4.81M | ﹤0.01% |
56,400
+55,831
| +9,812% | +$4.83M |
|
1222
CALL
Dominion Energy
D
$62.5B
| $4.8M | ﹤0.01% |
65,200
+64,558
| +10,056% | +$4.98M |
|
1223
PUT
Tyler Technologies
TYL
$12.3B
| $4.79M | ﹤0.01% |
10,600
+10,489
| +9,450% | +$4.46M |
|
|
NEX
1224
PUT
DELISTED
NexTier Oilfield Solutions Inc.
NEX
| $4.79M | ﹤0.01% |
1,006,300
+997,848
| +11,806% | +$4.38M |
|
1225
Direxion Daily Technology Bull 3x ETF
TECL
$5.08B
| $4.79M | ﹤0.01% |
86,083
+26,765
| +45% | +$1.28M |
|
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.