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 | |
|---|---|---|---|---|---|---|
5726
PUT
CalciMedica
CALC
$15.8M
| $193K | ﹤0.01% |
+2,550
| New | +$167K |
|
5727
PUT
Compass
COMP
$8.51B
| $193K | ﹤0.01% |
+14,700
| New | +$229K |
|
5728
CALL
Dycom Industries
DY
$12B
| $193K | ﹤0.01% |
2,600
+2,436
| +1,485% | +$210K |
|
5729
PUT
i3 Verticals
IIIV
$412M
| $193K | ﹤0.01% |
6,400
+6,338
| +10,223% | +$201K |
|
5730
Quaker Houghton
KWR
$2.76B
| $193K | ﹤0.01% |
815
-100
| -11% | -$23.9K |
|
|
MZTI
5731
CALL
The Marzetti Company
MZTI
$2.93B
| $193K | ﹤0.01% |
+1,000
| New | +$188K |
|
5732
The 3D Printing ETF
PRNT
$59.5M
| $193K | ﹤0.01% |
+4,859
| New | +$186K |
|
|
SNV
5733
PUT
DELISTED
Synovus
SNV
| $193K | ﹤0.01% |
4,400
+4,004
| +1,011% | +$188K |
|
|
HRC
5734
PUT
DELISTED
HILL-ROM HOLDINGS, INC.
HRC
| $193K | ﹤0.01% |
1,700
+1,642
| +2,831% | +$184K |
|
|
PEI
5735
CALL
DELISTED
Pennsylvania Real Estate Investment Trust
PEI
| $193K | ﹤0.01% |
+5,193
| New | +$169K |
|
5736
CALL
Coherus Oncology
CHRS
$217M
| $192K | ﹤0.01% |
+13,900
| New | +$197K |
|
5737
Capital Southwest
CSWC
$1.47B
| $192K | ﹤0.01% |
+8,299
| New | +$206K |
|
|
HITI
5738
PUT
High Tide
HITI
$186M
| $192K | ﹤0.01% |
+24,100
| New | +$193K |
|
5739
Nordic American Tanker
NAT
$1.38B
| $192K | ﹤0.01% |
58,701
+12,839
| +28% | +$43.4K |
|
5740
PUT
Resideo Technologies
REZI
$5.19B
| $192K | ﹤0.01% |
6,400
+6,377
| +27,726% | +$189K |
|
5741
PUT
Tactile Systems Technology
TCMD
$635M
| $192K | ﹤0.01% |
+3,700
| New | +$200K |
|
5742
APi Group
APG
$17.1B
| $191K | ﹤0.01% |
+13,782
| New | +$195K |
|
|
APLT
5743
PUT
DELISTED
Applied Therapeutics
APLT
| $191K | ﹤0.01% |
9,200
+9,199
| +919,900% | +$174K |
|
5744
PUT
Brookdale Senior Living
BKD
$3.49B
| $191K | ﹤0.01% |
24,200
+23,769
| +5,515% | +$171K |
|
5745
CALL
Comstock Resources
CRK
$3.89B
| $191K | ﹤0.01% |
28,700
+28,236
| +6,085% | +$163K |
|
5746
CALL
Castor Maritime
CTRM
$18.8M
| $191K | ﹤0.01% |
+7,340
| New | +$298K |
|
5747
ProShares Ultra Dow30
DDM
$542M
| $191K | ﹤0.01% |
+5,310
| New | +$187K |
|
5748
Diamondrock Hospitality Co
DRH
$2.71B
| $191K | ﹤0.01% |
+19,694
| New | +$198K |
|
5749
CALL
Kimbell Royalty Partners
KRP
$1.48B
| $191K | ﹤0.01% |
14,900
+14,623
| +5,279% | +$174K |
|
|
SA
5750
CALL
Seabridge Gold
SA
$2.78B
| $191K | ﹤0.01% |
10,900
+10,649
| +4,243% | +$192K |
|
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.