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 | |
|---|---|---|---|---|---|---|
4701
CALL
Rigel Pharmaceuticals
RIGL
$723M
| $354K | ﹤0.01% |
8,170
+8,092
| +10,374% | +$306K |
|
|
BWAC
4702
PUT
DELISTED
BETTER WORLD ACQUISITION CORP. Common Stock
BWAC
| $354K | ﹤0.01% |
35,400
+35,324
| +46,479% | +$353K |
|
4703
CALL
Axalta
AXTA
$7.45B
| $353K | ﹤0.01% |
11,600
+11,088
| +2,166% | +$351K |
|
4704
CALL
Brink's
BCO
$5.01B
| $353K | ﹤0.01% |
4,600
+4,593
| +65,614% | +$357K |
|
|
WFH
4705
DELISTED
Direxion Work From Home ETF
WFH
| $353K | ﹤0.01% |
4,662
+2,326
| +100% | +$167K |
|
4706
CALL
Willdan Group
WLDN
$1.02B
| $353K | ﹤0.01% |
9,400
+9,286
| +8,146% | +$359K |
|
4707
CALL
Harmony Gold Mining
HMY
$9.7B
| $352K | ﹤0.01% |
94,400
+93,471
| +10,061% | +$444K |
|
4708
PUT
MidCap Financial Investment
MFIC
$801M
| $352K | ﹤0.01% |
25,800
+25,569
| +11,069% | +$367K |
|
4709
CALL
Westlake Chemical Partners
WLKP
$772M
| $352K | ﹤0.01% |
13,100
+12,924
| +7,343% | +$344K |
|
4710
American Superconductor
AMSC
$1.29B
| $351K | ﹤0.01% |
+20,197
| New | +$323K |
|
4711
PUT
EnerSys
ENS
$6.43B
| $351K | ﹤0.01% |
3,600
+3,593
| +51,329% | +$335K |
|
4712
PUT
Immunovant
IMVT
$7.93B
| $351K | ﹤0.01% |
33,300
+33,265
| +95,043% | +$464K |
|
4713
PUT
Gibraltar Industries
ROCK
$1.28B
| $351K | ﹤0.01% |
+4,600
| New | +$380K |
|
4714
CALL
United States Gasoline Fund
UGA
$146M
| $351K | ﹤0.01% |
9,800
+9,611
| +5,085% | +$326K |
|
4715
CALL
ING
ING
$92.9B
| $350K | ﹤0.01% |
26,500
+25,308
| +2,123% | +$332K |
|
|
NAGE
4716
PUT
Niagen Bioscience
NAGE
$256M
| $350K | ﹤0.01% |
35,500
+34,009
| +2,281% | +$297K |
|
|
HGEN
4717
DELISTED
HUMANIGEN, INC.
HGEN
| $350K | ﹤0.01% |
20,139
-14,578
| -42% | -$266K |
|
|
RTLR
4718
CALL
DELISTED
Rattler Midstream LP Common Units
RTLR
| $350K | ﹤0.01% |
32,100
+31,648
| +7,002% | +$349K |
|
|
AVEO
4719
CALL
DELISTED
AVEO Pharmaceuticals, Inc.
AVEO
| $350K | ﹤0.01% |
53,200
+52,504
| +7,544% | +$362K |
|
4720
CALL
Dana Inc
DAN
$2.88B
| $349K | ﹤0.01% |
14,700
+14,579
| +12,049% | +$378K |
|
|
SUMO
4721
DELISTED
Sumo Logic, Inc. Common Stock
SUMO
| $349K | ﹤0.01% |
16,945
-33,975
| -67% | -$656K |
|
|
APTS
4722
CALL
DELISTED
Preferred Apartment Communities, Inc.
APTS
| $349K | ﹤0.01% |
35,800
+35,419
| +9,296% | +$359K |
|
|
EFOR
4723
CALL
Everforth Inc
EFOR
$960M
| $348K | ﹤0.01% |
3,600
+3,566
| +10,488% | +$364K |
|
4724
Huntington Bancshares
HBAN
$34B
| $348K | ﹤0.01% |
+24,440
| New | +$374K |
|
|
VLRS
4725
Controladora Vuela Compania de Aviacion
VLRS
$869M
| $348K | ﹤0.01% |
18,129
-44,222
| -71% | -$752K |
|
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.