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 | |
|---|---|---|---|---|---|---|
3726
PUT
Mistras Group
MG
$490M
| $668K | ﹤0.01% |
+68,000
| New | +$733K |
|
3727
PUT
RCI Hospitality Holdings
RICK
$203M
| $668K | ﹤0.01% |
10,100
+9,878
| +4,450% | +$693K |
|
3728
CALL
Cooper-Standard Automotive
CPS
$526M
| $667K | ﹤0.01% |
23,000
+22,998
| +1,149,900% | +$711K |
|
3729
Oscar Health
OSCR
$9.47B
| $667K | ﹤0.01% |
31,026
+30,947
| +39,173% | +$741K |
|
3730
PUT
Alta Equipment Group
ALTG
$207M
| $663K | ﹤0.01% |
49,900
+49,501
| +12,406% | +$676K |
|
3731
PUT
Upbound Group
UPBD
$1.26B
| $663K | ﹤0.01% |
12,500
+12,477
| +54,248% | +$725K |
|
|
ETRN
3732
PUT
DELISTED
Equitrans Midstream Corporation Common Stock
ETRN
| $662K | ﹤0.01% |
77,900
+77,691
| +37,173% | +$658K |
|
|
FARO
3733
CALL
DELISTED
Faro Technologies
FARO
| $661K | ﹤0.01% |
+8,500
| New | +$670K |
|
|
CANO
3734
CALL
DELISTED
Cano Health, Inc.
CANO
| $661K | ﹤0.01% |
547
+525
| +2,386% | +$708K |
|
3735
CALL
Gold Fields
GFI
$29.2B
| $660K | ﹤0.01% |
74,200
+72,936
| +5,770% | +$756K |
|
|
CUTR
3736
DELISTED
Cutera, Inc.
CUTR
| $660K | ﹤0.01% |
+13,466
| New | +$494K |
|
3737
CALL
Delek US
DK
$3.85B
| $659K | ﹤0.01% |
30,500
+30,276
| +13,516% | +$684K |
|
|
EXE
3738
PUT
Expand Energy Corp
EXE
$21.2B
| $659K | ﹤0.01% |
12,700
+12,647
| +23,862% | +$631K |
|
3739
CALL
AAR Corp
AIR
$5.62B
| $658K | ﹤0.01% |
17,000
+16,434
| +2,904% | +$661K |
|
|
ASXC
3740
CALL
DELISTED
Asensus Surgical, Inc.
ASXC
| $658K | ﹤0.01% |
+207,700
| New | +$519K |
|
3741
PUT
Ocular Therapeutix
OCUL
$1.85B
| $657K | ﹤0.01% |
+46,400
| New | +$705K |
|
3742
PUT
Park Hotels & Resorts
PK
$3.06B
| $657K | ﹤0.01% |
31,900
+31,580
| +9,869% | +$676K |
|
|
MNTV
3743
CALL
DELISTED
Momentive Global Inc. Common Stock
MNTV
| $657K | ﹤0.01% |
31,200
+30,997
| +15,269% | +$600K |
|
|
GBIO
3744
DELISTED
Generation Bio
GBIO
| $656K | ﹤0.01% |
2,440
-3,163
| -56% | -$946K |
|
|
TUP
3745
PUT
DELISTED
Tupperware Brands Corporation
TUP
| $655K | ﹤0.01% |
27,600
+27,058
| +4,992% | +$686K |
|
3746
ProShares Ultra Silver
AGQ
$1.12B
| $654K | ﹤0.01% |
14,183
+6,758
| +91% | +$330K |
|
3747
Lennar Class A
LEN
$21.1B
| $654K | ﹤0.01% |
6,810
-10,114
| -60% | -$977K |
|
3748
CALL
Ryder
R
$9.98B
| $654K | ﹤0.01% |
8,800
+8,782
| +48,789% | +$695K |
|
3749
CALL
Medpace
MEDP
$15.9B
| $653K | ﹤0.01% |
3,700
+3,695
| +73,900% | +$638K |
|
3750
CALL
Caleres
CAL
$447M
| $652K | ﹤0.01% |
23,900
+23,723
| +13,403% | +$595K |
|
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.