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 | |
|---|---|---|---|---|---|---|
1376
CALL
Polaris
PII
$4.15B
| $4.05M | ﹤0.01% |
29,600
+29,410
| +15,479% | +$3.99M |
|
|
WWE
1377
CALL
DELISTED
World Wrestling Entertainment
WWE
| $4.05M | ﹤0.01% |
70,000
+69,513
| +14,274% | +$3.95M |
|
|
ZNGA
1378
PUT
DELISTED
ZYNGA INC. CL A COMMON
ZNGA
| $4.05M | ﹤0.01% |
+381,200
| New | +$4.02M |
|
1379
Union Pacific
UNP
$182B
| $4.05M | ﹤0.01% |
18,421
+2,937
| +19% | +$654K |
|
1380
PUT
Dominion Energy
D
$62.5B
| $4.04M | ﹤0.01% |
54,900
+54,447
| +12,019% | +$4.2M |
|
1381
CALL
Jazz Pharmaceuticals
JAZZ
$15.9B
| $4.03M | ﹤0.01% |
22,700
+22,438
| +8,564% | +$3.89M |
|
1382
iPath Series B S&P 500 VIX Short-Term Futures ETN
VXX
$162M
| $4.03M | ﹤0.01% |
8,554
-14,106
| -62% | -$8.41M |
|
1383
CALL
Lufax Holding
LU
$1.2B
| $4.03M | ﹤0.01% |
89,175
+89,118
| +156,347% | +$4.49M |
|
|
MRSH
1384
Marsh
MRSH
$86.3B
| $4.03M | ﹤0.01% |
+28,652
| New | +$3.84M |
|
1385
CALL
B&G Foods
BGS
$285M
| $4.03M | ﹤0.01% |
122,800
+122,109
| +17,671% | +$3.76M |
|
1386
CALL
Rithm Capital
RITM
$5.09B
| $4.03M | ﹤0.01% |
380,300
+378,224
| +18,219% | +$4.02M |
|
1387
CALL
Service Corp International
SCI
$11.4B
| $4.01M | ﹤0.01% |
+74,900
| New | +$3.98M |
|
1388
PUT
Williams Companies
WMB
$90.5B
| $4.01M | ﹤0.01% |
151,100
+149,523
| +9,481% | +$3.83M |
|
1389
PUT
Coupang
CPNG
$27.8B
| $4.01M | ﹤0.01% |
95,800
+95,484
| +30,216% | +$3.91M |
|
|
ALTU
1390
CALL
DELISTED
Altitude Acquisition Corp
ALTU
| $4M | ﹤0.01% |
408,900
+404,892
| +10,102% | +$3.99M |
|
|
DQ
1391
CALL
Daqo New Energy
DQ
$790M
| $4M | ﹤0.01% |
61,500
+60,872
| +9,693% | +$4.38M |
|
1392
PUT
L3Harris
LHX
$55.9B
| $4M | ﹤0.01% |
18,500
+18,201
| +6,087% | +$3.91M |
|
|
NNDM
1393
PUT
Nano Dimension
NNDM
$309M
| $4M | ﹤0.01% |
485,000
+479,578
| +8,845% | +$3.55M |
|
1394
CALL
Vornado Realty Trust
VNO
$7.47B
| $3.99M | ﹤0.01% |
85,600
+84,678
| +9,184% | +$3.96M |
|
1395
CALL
Factset
FDS
$9.05B
| $3.99M | ﹤0.01% |
11,900
+11,776
| +9,497% | +$3.86M |
|
1396
PUT
GSK
GSK
$103B
| $3.99M | ﹤0.01% |
80,240
+79,410
| +9,567% | +$3.82M |
|
1397
CALL
Alaska Air
ALK
$5.15B
| $3.99M | ﹤0.01% |
+66,200
| New | +$4.47M |
|
1398
CALL
EPAM Systems
EPAM
$4.69B
| $3.98M | ﹤0.01% |
7,800
+7,784
| +48,650% | +$3.65M |
|
1399
CALL
Louisiana-Pacific
LPX
$5.2B
| $3.98M | ﹤0.01% |
66,100
+65,877
| +29,541% | +$4.21M |
|
1400
CALL
Invesco Aerospace & Defense ETF
PPA
$8.27B
| $3.98M | ﹤0.01% |
40,500
+40,118
| +10,502% | +$3.02M |
|
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.