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 | |
|---|---|---|---|---|---|---|
|
ZIXI
8651
DELISTED
Zix Corporation
ZIXI
| $19K | ﹤0.01% |
2,735
-51,267
| -95% | -$371K |
|
|
CEMI
8652
DELISTED
Chembio diagnostics, Inc.
CEMI
| $19K | ﹤0.01% |
6,533
+68
| +1% | +$237 |
|
8653
PUT
AC Immune
ACIU
$227M
| $18K | ﹤0.01% |
2,300
+2,288
| +19,067% | +$15.8K |
|
8654
Allegro MicroSystems
ALGM
$8.58B
| $18K | ﹤0.01% |
663
+548
| +477% | +$14.3K |
|
8655
PUT
America Movil
AMX
$78.1B
| $18K | ﹤0.01% |
1,200
-788
| -40% | -$11.7K |
|
8656
Ardmore Shipping
ASC
$678M
| $18K | ﹤0.01% |
+4,486
| New | +$19.2K |
|
8657
CALL
Altisource Portfolio Solutions
ASPS
$65.4M
| $18K | ﹤0.01% |
263
+258
| +5,160% | +$15K |
|
8658
CrossAmerica Partners
CAPL
$830M
| $18K | ﹤0.01% |
965
+116
| +14% | +$2.28K |
|
8659
Chubb
CB
$140B
| $18K | ﹤0.01% |
+115
| New | +$19.1K |
|
8660
CALL
Cohu
COHU
$2.39B
| $18K | ﹤0.01% |
500
+459
| +1,120% | +$18.2K |
|
8661
PUT
CubeSmart
CUBE
$9.53B
| $18K | ﹤0.01% |
400
+398
| +19,900% | +$17.2K |
|
|
CUK
8662
DELISTED
Carnival PLC
CUK
| $18K | ﹤0.01% |
+810
| New | +$19.5K |
|
8663
PUT
Flux Power
FLUX
$12.6M
| $18K | ﹤0.01% |
+1,600
| New | +$17.4K |
|
8664
CALL
Golub Capital BDC
GBDC
$3.33B
| $18K | ﹤0.01% |
1,200
+1,160
| +2,900% | +$18K |
|
8665
PUT
Harvard Bioscience
HBIO
$27.1M
| $18K | ﹤0.01% |
220
+219
| +21,900% | +$15.5K |
|
8666
Hexcel
HXL
$8.32B
| $18K | ﹤0.01% |
292
-1,067
| -79% | -$61.5K |
|
8667
iShares 5-10 Year Investment Grade Corporate Bond ETF
IGIB
$18.3B
| $18K | ﹤0.01% |
300
| – | – |
|
8668
Innospec
IOSP
$2.09B
| $18K | ﹤0.01% |
+200
| New | +$19.8K |
|
8669
CALL
Integer Holdings
ITGR
$3.35B
| $18K | ﹤0.01% |
200
+191
| +2,122% | +$17.6K |
|
8670
PUT
Laureate Education
LAUR
$5.18B
| $18K | ﹤0.01% |
1,300
+1,151
| +772% | +$16.3K |
|
8671
PUT
LifeVantage
LFVN
$82.4M
| $18K | ﹤0.01% |
+2,500
| New | +$20.4K |
|
8672
PUT
Movado Group
MOV
$812M
| $18K | ﹤0.01% |
600
+598
| +29,900% | +$18.2K |
|
8673
Virtus InfraCap US Preferred Stock ETF
PFFA
$2.41B
| $18K | ﹤0.01% |
756
+187
| +33% | +$4.6K |
|
|
PRO
8674
CALL
DELISTED
PROS Holdings
PRO
| $18K | ﹤0.01% |
400
+367
| +1,112% | +$16.2K |
|
8675
CALL
Radiant Logistics
RLGT
$416M
| $18K | ﹤0.01% |
2,700
+2,690
| +26,900% | +$19.5K |
|
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.