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 | |
|---|---|---|---|---|---|---|
6501
Televisa
TV
$1.48B
| $117K | ﹤0.01% |
8,209
-90,920
| -92% | -$1.17M |
|
6502
CALL
U-Haul Holding Co
UHAL
$13.9B
| $117K | ﹤0.01% |
2,000
+1,760
| +733% | +$103K |
|
|
TFFP
6503
CALL
DELISTED
TFF Pharmaceuticals, Inc. Common Stock
TFFP
| $117K | ﹤0.01% |
488
+471
| +2,771% | +$129K |
|
6504
Burford Capital
BUR
$903M
| $116K | ﹤0.01% |
+11,254
| New | +$128K |
|
6505
CALL
DigitalOcean
DOCN
$13.7B
| $116K | ﹤0.01% |
+2,100
| New | +$90.7K |
|
6506
CALL
Gilat Satellite Networks
GILT
$834M
| $116K | ﹤0.01% |
11,400
+11,283
| +9,644% | +$112K |
|
6507
KALA BIO
KALA
$14.1M
| $116K | ﹤0.01% |
9
| – | – |
|
6508
Kulicke & Soffa
KLIC
$4.67B
| $116K | ﹤0.01% |
1,900
-2,700
| -59% | -$145K |
|
6509
PUT
Kamada
KMDA
$412M
| $116K | ﹤0.01% |
+20,100
| New | +$120K |
|
6510
CALL
Kayne Anderson Energy Infrastructure Fund
KYN
$2.47B
| $116K | ﹤0.01% |
13,100
+12,883
| +5,937% | +$103K |
|
6511
PUT
Liberty Global Class C
LBTYK
$3.53B
| $116K | ﹤0.01% |
4,300
+4,275
| +17,100% | +$115K |
|
6512
CALL
Maravai LifeSciences
MRVI
$969M
| $116K | ﹤0.01% |
2,800
+2,734
| +4,142% | +$106K |
|
6513
Middlesex Water
MSEX
$1.08B
| $116K | ﹤0.01% |
1,424
+1,394
| +4,647% | +$115K |
|
6514
Pluri
PLUR
$16.7M
| $116K | ﹤0.01% |
3,688
+2,760
| +297% | +$91.4K |
|
|
DAY
6515
DELISTED
Dayforce
DAY
| $116K | ﹤0.01% |
1,218
-1,809
| -60% | -$163K |
|
|
AAN
6516
DELISTED
The Aaron's Company Inc
AAN
| $116K | ﹤0.01% |
3,636
+2,645
| +267% | +$83.4K |
|
|
FPAC
6517
PUT
DELISTED
Far Peak Acquisition Corporation
FPAC
| $116K | ﹤0.01% |
11,700
+11,018
| +1,616% | +$108K |
|
|
PRAH
6518
DELISTED
PRA Health Sciences, Inc.
PRAH
| $116K | ﹤0.01% |
705
-147
| -17% | -$24.5K |
|
|
SPI
6519
PUT
DELISTED
SPI Energy Co., Ltd. Ordinary Shares
SPI
| $116K | ﹤0.01% |
17,400
+16,936
| +3,650% | +$109K |
|
6520
PUT
Amkor Technology
AMKR
$12.4B
| $115K | ﹤0.01% |
4,900
+4,817
| +5,804% | +$107K |
|
|
DNB
6521
DELISTED
Dun & Bradstreet
DNB
| $115K | ﹤0.01% |
5,411
+4,381
| +425% | +$98.1K |
|
6522
Huron Consulting
HURN
$2.41B
| $115K | ﹤0.01% |
2,353
-1,766
| -43% | -$94.9K |
|
6523
CALL
Northwest Natural Holdings
NWN
$2.06B
| $115K | ﹤0.01% |
2,200
+2,168
| +6,775% | +$117K |
|
|
VIVO
6524
PUT
VivoPower PLC
VIVO
$110M
| $115K | ﹤0.01% |
1,580
+1,577
| +52,567% | +$122K |
|
|
AAN
6525
PUT
DELISTED
The Aaron's Company Inc
AAN
| $115K | ﹤0.01% |
+3,600
| New | +$113K |
|
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.