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 | |
|---|---|---|---|---|---|---|
4451
PUT
Camtek
CAMT
$5.92B
| $414K | ﹤0.01% |
11,000
+10,991
| +122,122% | +$373K |
|
4452
CALL
Trupanion
TRUP
$1.13B
| $414K | ﹤0.01% |
3,600
+3,592
| +44,900% | +$312K |
|
4453
CRH
CRH
$66.6B
| $413K | ﹤0.01% |
8,136
-281
| -3% | -$14.1K |
|
|
AY
4454
PUT
DELISTED
Atlantica Sustainable Infrastructure plc Ordinary Shares
AY
| $413K | ﹤0.01% |
11,100
+10,991
| +10,083% | +$408K |
|
|
SNP
4455
CALL
DELISTED
CHINA PETROLEUM & CHEMICAL CORPORATION ADS (REP 100 ORDINARY H SHARES)
SNP
| $413K | ﹤0.01% |
8,100
+7,964
| +5,856% | +$421K |
|
4456
PUT
iHeartMedia
IHRT
$531M
| $412K | ﹤0.01% |
15,300
+15,209
| +16,713% | +$337K |
|
|
DFTX
4457
CALL
Definium Therapeutics
DFTX
$5.6B
| $412K | ﹤0.01% |
+7,980
| New | +$419K |
|
4458
CALL
Aecom
ACM
$9.46B
| $411K | ﹤0.01% |
6,500
+6,435
| +9,900% | +$421K |
|
4459
CALL
AEye
LIDR
$47.2M
| $411K | ﹤0.01% |
1,367
+1,349
| +7,494% | +$405K |
|
|
UNIT
4460
PUT
Uniti Group
UNIT
$2.52B
| $411K | ﹤0.01% |
38,900
+38,148
| +5,073% | +$414K |
|
4461
CALL
Comtech Telecommunications
CMTL
$49.7M
| $410K | ﹤0.01% |
17,000
+16,958
| +40,376% | +$414K |
|
|
EFC
4462
PUT
Ellington Financial
EFC
$1.69B
| $409K | ﹤0.01% |
21,400
+21,225
| +12,129% | +$392K |
|
4463
CALL
Globe Life
GL
$14B
| $409K | ﹤0.01% |
4,300
+4,297
| +143,233% | +$440K |
|
4464
PUT
ADMA Biologics
ADMA
$2.02B
| $408K | ﹤0.01% |
255,600
+253,136
| +10,273% | +$445K |
|
4465
PUT
Casey's General Stores
CASY
$32.1B
| $408K | ﹤0.01% |
2,100
+2,091
| +23,233% | +$450K |
|
4466
Consolidated Edison
ED
$41.4B
| $408K | ﹤0.01% |
+5,701
| New | +$438K |
|
4467
Novartis
NVS
$302B
| $408K | ﹤0.01% |
+4,475
| New | +$398K |
|
4468
Purple Innovation
PRPL
$34.5M
| $408K | ﹤0.01% |
619
-119
| -16% | -$91.3K |
|
|
LFLY
4469
CALL
DELISTED
Leafly Holdings, Inc. Common Stock
LFLY
| $408K | ﹤0.01% |
+2,055
| New | +$409K |
|
4470
PUT
Aemetis
AMTX
$99.2M
| $407K | ﹤0.01% |
36,500
+36,190
| +11,674% | +$570K |
|
4471
CALL
Goosehead Insurance
GSHD
$1.68B
| $407K | ﹤0.01% |
3,200
+3,198
| +159,900% | +$326K |
|
4472
PUT
LiveRamp
RAMP
$2.29B
| $407K | ﹤0.01% |
8,700
+8,534
| +5,141% | +$410K |
|
4473
PUT
Century Casinos
CNTY
$32.9M
| $406K | ﹤0.01% |
+30,300
| New | +$396K |
|
4474
CALL
Ingevity
NGVT
$2.46B
| $406K | ﹤0.01% |
5,000
+4,923
| +6,394% | +$396K |
|
4475
CALL
Toro Company
TTC
$8.79B
| $406K | ﹤0.01% |
3,700
+3,661
| +9,387% | +$402K |
|
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.