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 | |
|---|---|---|---|---|---|---|
2726
CALL
Cemex
CX
$17.4B
| $1.32M | ﹤0.01% |
157,500
+155,013
| +6,233% | +$1.23M |
|
2727
CALL
Kopin
KOPN
$663M
| $1.32M | ﹤0.01% |
+161,800
| New | +$1.34M |
|
2728
CALL
AES
AES
$10.6B
| $1.32M | ﹤0.01% |
50,700
+50,458
| +20,850% | +$1.33M |
|
2729
PUT
LifeMD
LFMD
$179M
| $1.32M | ﹤0.01% |
112,200
+111,588
| +18,233% | +$1.28M |
|
2730
CALL
Oppenheimer Holdings
OPY
$1.17B
| $1.32M | ﹤0.01% |
26,000
+25,928
| +36,011% | +$1.25M |
|
|
PLAN
2731
CALL
DELISTED
Anaplan, Inc.
PLAN
| $1.32M | ﹤0.01% |
24,800
+24,154
| +3,739% | +$1.34M |
|
|
JO
2732
DELISTED
iPath Series B Bloomberg Coffee Subindex Total ReturnSM ETN
JO
| $1.32M | ﹤0.01% |
29,361
-11,420
| -28% | -$478K |
|
2733
PUT
Cardlytics
CDLX
$21M
| $1.32M | ﹤0.01% |
1,040
+1,036
| +25,900% | +$1.17M |
|
|
MFA
2734
PUT
MFA Financial
MFA
$929M
| $1.31M | ﹤0.01% |
71,650
+70,230
| +4,946% | +$1.24M |
|
|
SDC
2735
CALL
DELISTED
SmileDirectClub, Inc. Class A Common Stock
SDC
| $1.31M | ﹤0.01% |
151,500
+150,762
| +20,428% | +$1.39M |
|
2736
CALL
CoreCivic
CXW
$3.1B
| $1.31M | ﹤0.01% |
125,200
+124,057
| +10,854% | +$1.11M |
|
|
IDEX
2737
CALL
DELISTED
Ideanomics, Inc. Common Stock
IDEX
| $1.31M | ﹤0.01% |
3,691
+3,669
| +16,677% | +$1.31M |
|
|
SII
2738
CALL
Sprott
SII
$2.65B
| $1.31M | ﹤0.01% |
33,300
+33,058
| +13,660% | +$1.42M |
|
|
HGEN
2739
PUT
DELISTED
HUMANIGEN, INC.
HGEN
| $1.31M | ﹤0.01% |
75,300
+73,067
| +3,272% | +$1.33M |
|
|
OPTU
2740
CALL
Optimum Communications Inc
OPTU
$316M
| $1.31M | ﹤0.01% |
38,300
+38,135
| +23,112% | +$1.33M |
|
2741
CALL
Monolithic Power Systems
MPWR
$65.5B
| $1.31M | ﹤0.01% |
3,500
+3,481
| +18,321% | +$1.23M |
|
2742
CALL
MACOM Technology Solutions
MTSI
$20.4B
| $1.31M | ﹤0.01% |
20,400
+19,892
| +3,916% | +$1.15M |
|
2743
CALL
iShares Convertible Bond ETF
ICVT
$7.23B
| $1.31M | ﹤0.01% |
38,700
+37,955
| +5,095% | +$3.77M |
|
2744
CALL
Sociedad Química y Minera de Chile
SQM
$19.6B
| $1.31M | ﹤0.01% |
27,600
+27,006
| +4,546% | +$1.33M |
|
|
SP
2745
PUT
DELISTED
SP Plus Corporation
SP
| $1.31M | ﹤0.01% |
42,700
+42,414
| +14,830% | +$1.39M |
|
|
AMRN
2746
CALL
Amarin Corp
AMRN
$284M
| $1.3M | ﹤0.01% |
+14,890
| New | +$1.46M |
|
2747
Kinross Gold
KGC
$28.5B
| $1.3M | ﹤0.01% |
205,250
+34,121
| +20% | +$253K |
|
|
REGI
2748
CALL
DELISTED
Renewable Energy Group, Inc.
REGI
| $1.3M | ﹤0.01% |
20,900
+20,871
| +71,969% | +$1.3M |
|
2749
Carrier Global
CARR
$57.2B
| $1.3M | ﹤0.01% |
26,755
+18,441
| +222% | +$824K |
|
2750
PUT
nCino
NCNO
$1.81B
| $1.3M | ﹤0.01% |
21,700
+21,450
| +8,580% | +$1.35M |
|
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.