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 | |
|---|---|---|---|---|---|---|
|
SEAH
3151
CALL
DELISTED
Sports Entertainment Acquisition Corp.
SEAH
| $976K | ﹤0.01% |
+96,900
| New | +$978K |
|
|
FTCV
3152
PUT
DELISTED
FinTech Acquisition Corp. V Class A Common Stock
FTCV
| $973K | ﹤0.01% |
+79,900
| New | +$923K |
|
|
CDK
3153
CALL
DELISTED
CDK Global, Inc.
CDK
| $973K | ﹤0.01% |
19,600
+19,533
| +29,154% | +$1.03M |
|
3154
CALL
iHeartMedia
IHRT
$547M
| $972K | ﹤0.01% |
36,100
+36,026
| +48,684% | +$797K |
|
|
AHT
3155
CALL
Ashford Hospitality Trust
AHT
$20.9M
| $971K | ﹤0.01% |
+2,130
| New | +$772K |
|
3156
PUT
Hannon Armstrong Sustainable Infrastructure Capital
HASI
$4.91B
| $971K | ﹤0.01% |
17,300
+17,160
| +12,257% | +$892K |
|
3157
PUT
Allegiant Air
ALGT
$2.66B
| $970K | ﹤0.01% |
5,000
+4,997
| +166,567% | +$1.12M |
|
3158
ING
ING
$95.7B
| $970K | ﹤0.01% |
73,319
+67,791
| +1,226% | +$889K |
|
|
DCP
3159
PUT
DELISTED
DCP Midstream, LP
DCP
| $969K | ﹤0.01% |
31,600
+31,213
| +8,065% | +$806K |
|
3160
PUT
Huron Consulting
HURN
$1.89B
| $968K | ﹤0.01% |
+19,700
| New | +$1.06M |
|
3161
PUT
Sasol
SSL
$7.34B
| $968K | ﹤0.01% |
63,200
+62,561
| +9,790% | +$1.02M |
|
|
MFA
3162
CALL
MFA Financial
MFA
$927M
| $967K | ﹤0.01% |
52,700
+52,147
| +9,430% | +$922K |
|
3163
VanEck Steel ETF
SLX
$167M
| $967K | ﹤0.01% |
15,609
+3,038
| +24% | +$186K |
|
3164
CALL
Tenable Holdings
TENB
$3.58B
| $967K | ﹤0.01% |
23,400
+23,378
| +106,264% | +$948K |
|
|
RCM
3165
CALL
DELISTED
R1 RCM Inc. Common Stock
RCM
| $967K | ﹤0.01% |
43,500
+43,155
| +12,509% | +$1.04M |
|
3166
PUT
Arthur J. Gallagher & Co
AJG
$65.1B
| $966K | ﹤0.01% |
6,900
+6,861
| +17,592% | +$970K |
|
3167
PUT
Bio-Rad Laboratories Class A
BIO
$8.47B
| $966K | ﹤0.01% |
1,500
+1,499
| +149,900% | +$912K |
|
3168
PUT
Cal-Maine
CALM
$4.2B
| $966K | ﹤0.01% |
+26,700
| New | +$1,000K |
|
3169
Deutsche Bank
DB
$67.9B
| $966K | ﹤0.01% |
+73,903
| New | +$1M |
|
|
WW
3170
DELISTED
WW International
WW
| $966K | ﹤0.01% |
26,743
-31,737
| -54% | -$1.09M |
|
3171
CALL
Bankunited
BKU
$3.36B
| $964K | ﹤0.01% |
22,600
+22,310
| +7,693% | +$1.02M |
|
|
VCRA
3172
CALL
DELISTED
VOCERA COMMUNICATIONS, INC.
VCRA
| $964K | ﹤0.01% |
24,200
+24,015
| +12,981% | +$877K |
|
3173
PUT
Neurocrine Biosciences
NBIX
$17.7B
| $963K | ﹤0.01% |
9,900
+9,749
| +6,456% | +$934K |
|
3174
CALL
Perion Network
PERI
$371M
| $963K | ﹤0.01% |
45,000
+43,926
| +4,090% | +$742K |
|
|
LOV
3175
DELISTED
Spark Networks SE American Depositary Shares
LOV
| $963K | ﹤0.01% |
185,997
+96,963
| +109% | +$607K |
|
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.