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 | |
|---|---|---|---|---|---|---|
|
EXPR
2626
DELISTED
Express, Inc.
EXPR
| $1.43M | ﹤0.01% |
11,016
+613
| +6% | +$51.7K |
|
2627
CALL
Fluor
FLR
$7.29B
| $1.43M | ﹤0.01% |
80,700
+79,629
| +7,435% | +$1.64M |
|
2628
CALL
Guardant Health
GH
$19.5B
| $1.43M | ﹤0.01% |
11,500
+11,442
| +19,728% | +$1.54M |
|
2629
PUT
FerroAtlántica
GSM
$628M
| $1.43M | ﹤0.01% |
233,400
+233,102
| +78,222% | +$1.09M |
|
|
INOV
2630
CALL
DELISTED
Inovalon Holdings, Inc. Class A Common Stock
INOV
| $1.43M | ﹤0.01% |
41,900
+41,684
| +19,298% | +$1.29M |
|
2631
CALL
LG Display
LPL
$3.17B
| $1.42M | ﹤0.01% |
133,300
+132,191
| +11,920% | +$1.41M |
|
2632
CALL
MPLX
MPLX
$59.5B
| $1.42M | ﹤0.01% |
48,100
+47,705
| +12,077% | +$1.35M |
|
2633
QuidelOrtho
QDEL
$1.09B
| $1.42M | ﹤0.01% |
11,098
+10,163
| +1,087% | +$1.2M |
|
|
ARNC
2634
PUT
DELISTED
Arconic Corporation
ARNC
| $1.42M | ﹤0.01% |
39,900
+39,572
| +12,065% | +$1.31M |
|
2635
PUT
Papa John's
PZZA
$999M
| $1.42M | ﹤0.01% |
13,600
+13,413
| +7,173% | +$1.3M |
|
|
RAPT
2636
DELISTED
RAPT Therapeutics
RAPT
| $1.42M | ﹤0.01% |
+5,586
| New | +$1.04M |
|
2637
CALL
Sundial Growers
SNDL
$325M
| $1.42M | ﹤0.01% |
149,550
+147,690
| +7,940% | +$1.35M |
|
2638
CALL
Hims & Hers Health
HIMS
$6.5B
| $1.41M | ﹤0.01% |
129,800
+128,160
| +7,815% | +$1.52M |
|
2639
CALL
Energy Recovery
ERII
$434M
| $1.41M | ﹤0.01% |
+62,000
| New | +$1.22M |
|
|
XXII
2640
CALL
22nd Century Group
XXII
$1.47M
| – | – |
0
| – | – |
|
2641
PUT
Banco Macro
BMA
$5.7B
| $1.41M | ﹤0.01% |
93,900
+93,670
| +40,726% | +$1.4M |
|
2642
PUT
Regions Financial
RF
$26.3B
| $1.41M | ﹤0.01% |
69,900
+69,155
| +9,283% | +$1.5M |
|
|
PPD
2643
PUT
DELISTED
PPD, Inc. Common Stock
PPD
| $1.41M | ﹤0.01% |
30,600
+30,470
| +23,438% | +$1.38M |
|
2644
CALL
Martin Marietta Materials
MLM
$33.6B
| $1.41M | ﹤0.01% |
4,000
+3,859
| +2,737% | +$1.37M |
|
2645
CALL
Entergy
ETR
$54.1B
| $1.41M | ﹤0.01% |
28,200
+28,010
| +14,742% | +$1.48M |
|
|
EH
2646
CALL
EHang Holdings
EH
$372M
| $1.4M | ﹤0.01% |
32,600
+32,418
| +17,812% | +$986K |
|
2647
TE Connectivity
TEL
$58.8B
| $1.4M | ﹤0.01% |
10,362
+6,071
| +141% | +$813K |
|
2648
Lumentum
LITE
$59.4B
| $1.4M | ﹤0.01% |
17,079
+12,223
| +252% | +$1.03M |
|
2649
CALL
Zions Bancorporation
ZION
$10.1B
| $1.4M | ﹤0.01% |
26,500
+26,087
| +6,316% | +$1.46M |
|
2650
CALL
Qualys
QLYS
$4.84B
| $1.4M | ﹤0.01% |
13,900
+13,825
| +18,433% | +$1.41M |
|
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.