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 | |
|---|---|---|---|---|---|---|
|
LFC
3926
PUT
DELISTED
China Life Insurance Company Ltd.
LFC
| $576K | ﹤0.01% |
57,900
+55,715
| +2,550% | +$571K |
|
|
WLL
3927
CALL
DELISTED
Whiting Petroleum Corporation
WLL
| $574K | ﹤0.01% |
116,400
+115,262
| +10,128% | +$4.95M |
|
3928
CALL
Targa Resources
TRGP
$56.2B
| $573K | ﹤0.01% |
12,900
+12,286
| +2,001% | +$476K |
|
|
ACB
3929
PUT
Aurora Cannabis
ACB
$168M
| $572K | ﹤0.01% |
6,332
+5,877
| +1,292% | +$509K |
|
3930
CALL
Century Communities
CCS
$2.05B
| $572K | ﹤0.01% |
8,600
+8,563
| +23,143% | +$604K |
|
3931
CALL
Marcus Corp
MCS
$766M
| $572K | ﹤0.01% |
27,000
+26,805
| +13,746% | +$557K |
|
3932
Quanterix
QTRX
$164M
| $572K | ﹤0.01% |
9,753
+9,045
| +1,278% | +$525K |
|
|
RDUS
3933
PUT
DELISTED
Radius Health, Inc.
RDUS
| $572K | ﹤0.01% |
31,400
+31,252
| +21,116% | +$621K |
|
3934
Cincinnati Financial
CINF
$28.3B
| $571K | ﹤0.01% |
4,897
-565
| -10% | -$65.2K |
|
3935
PUT
Shift4
FOUR
$4.35B
| $571K | ﹤0.01% |
6,100
+5,749
| +1,638% | +$543K |
|
3936
NMI Holdings
NMIH
$3.34B
| $571K | ﹤0.01% |
25,410
+23,960
| +1,652% | +$572K |
|
|
ELMS
3937
PUT
DELISTED
Electric Last Mile Solutions, Inc. Class A Common stock
ELMS
| $571K | ﹤0.01% |
56,700
+54,372
| +2,336% | +$544K |
|
3938
Alaska Air
ALK
$5.42B
| $570K | ﹤0.01% |
9,459
+5,362
| +131% | +$362K |
|
|
RJET
3939
PUT
Republic Airways Holdings
RJET
$863M
| $570K | ﹤0.01% |
4,073
+4,033
| +10,083% | +$650K |
|
3940
State Street
STT
$50.2B
| $570K | ﹤0.01% |
6,929
-8,841
| -56% | -$746K |
|
|
LGF.B
3941
CALL
DELISTED
Lions Gate Entertainment Corp. Class B Non-Voting Shares
LGF.B
| $570K | ﹤0.01% |
27,800
+27,517
| +9,723% | +$422K |
|
3942
SiriusXM
SIRI
$10.7B
| $569K | ﹤0.01% |
8,704
+3,754
| +76% | +$235K |
|
3943
PUT
Cipher Digital
CIFR
$8.35B
| $568K | ﹤0.01% |
+57,100
| New | +$574K |
|
3944
Huazhu Hotels Group
HTHT
$13.2B
| $568K | ﹤0.01% |
10,765
+9,541
| +779% | +$538K |
|
3945
CALL
Lee Enterprises
LEE
$177M
| $568K | ﹤0.01% |
20,100
+19,897
| +9,801% | +$587K |
|
3946
PUT
Monster Beverage
MNST
$95.6B
| $566K | ﹤0.01% |
+12,400
| New | +$582K |
|
3947
VanEck Retail ETF
RTH
$254M
| $566K | ﹤0.01% |
+3,223
| New | +$554K |
|
|
WIMI
3948
PUT
WiMi Hologram Cloud
WIMI
$21M
| $566K | ﹤0.01% |
10,310
+10,109
| +5,029% | +$568K |
|
|
AVTA
3949
PUT
DELISTED
Avantax, Inc. Common Stock
AVTA
| $566K | ﹤0.01% |
32,700
+31,879
| +3,883% | +$524K |
|
3950
PUT
Broadridge
BR
$18.3B
| $565K | ﹤0.01% |
3,500
+3,413
| +3,923% | +$545K |
|
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.