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 | |
|---|---|---|---|---|---|---|
1901
CALL
Owens Corning
OC
$11.5B
| $2.46M | ﹤0.01% |
25,100
+25,087
| +192,977% | +$2.51M |
|
|
HUYA
1902
Huya Inc
HUYA
$542M
| $2.46M | ﹤0.01% |
139,133
+98,086
| +239% | +$1.64M |
|
1903
CALL
BARK
BARK
$74.8M
| $2.45M | ﹤0.01% |
11,060
+10,924
| +8,032% | +$2.36M |
|
|
CS
1904
DELISTED
Credit Suisse Group
CS
| $2.45M | ﹤0.01% |
233,517
+23,996
| +11% | +$255K |
|
1905
PUT
Pacific Biosciences
PACB
$422M
| $2.45M | ﹤0.01% |
+70,000
| New | +$2.04M |
|
1906
CALL
Enbridge
ENB
$124B
| $2.45M | ﹤0.01% |
61,100
+60,571
| +11,450% | +$2.34M |
|
1907
Buckle
BKE
$2.19B
| $2.44M | ﹤0.01% |
49,147
+48,935
| +23,083% | +$2.08M |
|
|
PRTY
1908
CALL
DELISTED
Party City Holdco Inc.
PRTY
| $2.44M | ﹤0.01% |
262,000
+258,281
| +6,945% | +$2.11M |
|
1909
BioNTech
BNTX
$22.6B
| $2.44M | ﹤0.01% |
+10,890
| New | +$2.05M |
|
1910
CALL
Affiliated Managers Group
AMG
$9.46B
| $2.44M | ﹤0.01% |
+15,800
| New | +$2.52M |
|
|
TTM
1911
DELISTED
Tata Motors Limited
TTM
| $2.43M | ﹤0.01% |
106,722
+58,469
| +121% | +$1.25M |
|
1912
PUT
Cinemark Holdings
CNK
$3.82B
| $2.42M | ﹤0.01% |
+110,500
| New | +$2.45M |
|
1913
Ally Financial
ALLY
$13.1B
| $2.42M | ﹤0.01% |
+48,643
| New | +$2.5M |
|
|
MILE
1914
CALL
DELISTED
Metromile, Inc. Common Stock
MILE
| $2.42M | ﹤0.01% |
265,000
+263,934
| +24,759% | +$2.36M |
|
1915
Costco
COST
$415B
| $2.42M | ﹤0.01% |
6,123
-15,278
| -71% | -$5.78M |
|
1916
PUT
Root
ROOT
$917M
| $2.42M | ﹤0.01% |
12,433
+12,374
| +20,973% | +$2.34M |
|
1917
PUT
U-Haul Holding Co
UHAL
$14B
| $2.42M | ﹤0.01% |
+41,000
| New | +$2.4M |
|
1918
Citizens Financial Group
CFG
$30.4B
| $2.42M | ﹤0.01% |
52,654
+42,034
| +396% | +$1.98M |
|
1919
PUT
Masco
MAS
$16B
| $2.42M | ﹤0.01% |
41,000
+40,759
| +16,912% | +$2.51M |
|
1920
Corsair Gaming
CRSR
$1.05B
| $2.41M | ﹤0.01% |
+72,437
| New | +$2.38M |
|
1921
PUT
Bank of Montreal
BMO
$125B
| $2.41M | ﹤0.01% |
23,500
+23,012
| +4,716% | +$2.27M |
|
|
TELL
1922
PUT
DELISTED
Tellurian Inc.
TELL
| $2.41M | ﹤0.01% |
518,000
+513,612
| +11,705% | +$1.58M |
|
1923
CALL
The GEO Group
GEO
$4.13B
| $2.41M | ﹤0.01% |
338,000
+336,408
| +21,131% | +$2.12M |
|
1924
CALL
Thor Industries
THO
$3.99B
| $2.41M | ﹤0.01% |
21,300
+21,187
| +18,750% | +$2.69M |
|
1925
Direxion Daily S&P Oil & Gas Exp. & Prod. Bull 2X ETF
GUSH
$247M
| $2.4M | ﹤0.01% |
99,836
-110,168
| -52% | -$2.2M |
|
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.