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 | |
|---|---|---|---|---|---|---|
3651
Icahn Enterprises
IEP
$5.24B
| $700K | ﹤0.01% |
12,734
+837
| +7% | +$47.6K |
|
3652
CALL
Utz Brands
UTZ
$1.25B
| $699K | ﹤0.01% |
32,100
+31,991
| +29,350% | +$799K |
|
3653
CALL
Invitation Homes
INVH
$17.8B
| $697K | ﹤0.01% |
18,700
+18,671
| +64,383% | +$660K |
|
3654
PUT
Jabil
JBL
$31.5B
| $697K | ﹤0.01% |
12,000
+11,985
| +79,900% | +$660K |
|
|
MODV
3655
PUT
DELISTED
ModivCare
MODV
| $697K | ﹤0.01% |
4,100
+4,099
| +409,900% | +$614K |
|
3656
CALL
Lazard
LAZ
$4.27B
| $696K | ﹤0.01% |
15,400
+15,201
| +7,639% | +$697K |
|
3657
Petco
WOOF
$802M
| $696K | ﹤0.01% |
+31,098
| New | +$727K |
|
|
ZGNX
3658
DELISTED
Zogenix, Inc.
ZGNX
| $696K | ﹤0.01% |
40,327
+16,709
| +71% | +$308K |
|
3659
CALL
Ardelyx
ARDX
$1.25B
| $695K | ﹤0.01% |
91,700
+91,623
| +118,991% | +$677K |
|
|
HOFV
3660
CALL
DELISTED
Hall of Fame Resort & Entertainment Co
HOFV
| $695K | ﹤0.01% |
+8,041
| New | +$696K |
|
3661
PUT
Wintrust Financial
WTFC
$10.9B
| $695K | ﹤0.01% |
9,200
+9,199
| +919,900% | +$719K |
|
|
SF
3662
PUT
Stifel
SF
$12.8B
| $694K | ﹤0.01% |
16,050
+16,030
| +80,150% | +$719K |
|
3663
CALL
BlackSky Technology
BKSY
$913M
| $693K | ﹤0.01% |
+8,675
| New | +$693K |
|
3664
Equinix
EQIX
$104B
| $693K | ﹤0.01% |
+864
| New | +$642K |
|
|
3665
Invitation Homes
INVH
$17.8B
| $693K | ﹤0.01% |
18,606
+16,555
| +807% | +$585K |
|
|
CONX
3666
PUT
DELISTED
CONX Corp. Class A Common Stock
CONX
| $693K | ﹤0.01% |
70,300
+68,480
| +3,763% | +$679K |
|
3667
CALL
Barclays
BCS
$91.3B
| $690K | ﹤0.01% |
+71,600
| New | +$731K |
|
3668
Toronto Dominion Bank
TD
$199B
| $690K | ﹤0.01% |
+9,856
| New | +$690K |
|
|
AQUA
3669
DELISTED
Evoqua Water Technologies Corp. Common Stock
AQUA
| $690K | ﹤0.01% |
20,435
+5,025
| +33% | +$151K |
|
3670
FuelCell Energy
FCEL
$1.61B
| $689K | ﹤0.01% |
2,583
+2,490
| +2,677% | +$727K |
|
3671
CALL
Kilroy Realty
KRC
$4.36B
| $689K | ﹤0.01% |
9,900
+9,827
| +13,462% | +$680K |
|
|
Y
3672
DELISTED
Alleghany Corp
Y
| $689K | ﹤0.01% |
1,033
+904
| +701% | +$622K |
|
3673
PUT
Oscar Health
OSCR
$9.32B
| $688K | ﹤0.01% |
32,000
+31,987
| +246,054% | +$766K |
|
|
PLL
3674
DELISTED
Piedmont Lithium
PLL
| $688K | ﹤0.01% |
+8,808
| New | +$598K |
|
3675
Western Union
WU
$2.61B
| $688K | ﹤0.01% |
+29,969
| New | +$746K |
|
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.