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 | |
|---|---|---|---|---|---|---|
5001
Danaos Corp
DAC
$2.52B
| $297K | ﹤0.01% |
3,873
-9,077
| -70% | -$563K |
|
5002
Extreme Networks
EXTR
$3.8B
| $297K | ﹤0.01% |
26,662
-2,664
| -9% | -$28.3K |
|
5003
PUT
HealthEquity
HQY
$8.71B
| $297K | ﹤0.01% |
3,700
+3,606
| +3,836% | +$275K |
|
|
EMBJ
5004
Embraer S.A. ADS
EMBJ
$12B
| $296K | ﹤0.01% |
19,598
-62,480
| -76% | -$808K |
|
5005
Genuine Parts
GPC
$17.9B
| $296K | ﹤0.01% |
+2,346
| New | +$295K |
|
5006
PUT
Howmet Aerospace
HWM
$109B
| $296K | ﹤0.01% |
8,800
+8,713
| +10,015% | +$291K |
|
5007
PUT
Nektar Therapeutics
NKTR
$2.39B
| $296K | ﹤0.01% |
1,153
+1,145
| +14,313% | +$317K |
|
5008
CALL
Vicor
VICR
$8.33B
| $296K | ﹤0.01% |
2,800
+2,798
| +139,900% | +$249K |
|
|
VRS
5009
DELISTED
Verso Corporation
VRS
| $296K | ﹤0.01% |
16,764
+4,006
| +31% | +$66K |
|
5010
Insmed
INSM
$22.4B
| $295K | ﹤0.01% |
10,384
+3,697
| +55% | +$110K |
|
5011
Yext
YEXT
$573M
| $295K | ﹤0.01% |
20,687
-9,795
| -32% | -$136K |
|
5012
CALL
Fortress Biotech
FBIO
$111M
| $294K | ﹤0.01% |
+5,500
| New | +$332K |
|
5013
Grocery Outlet
GO
$904M
| $294K | ﹤0.01% |
+8,484
| New | +$310K |
|
5014
CALL
Lakeland Industries
LAKE
$108M
| $294K | ﹤0.01% |
13,200
+12,987
| +6,097% | +$335K |
|
5015
ADMA Biologics
ADMA
$2.02B
| $293K | ﹤0.01% |
183,196
+12,832
| +8% | +$22.6K |
|
5016
CALL
Nordic American Tanker
NAT
$1.36B
| $293K | ﹤0.01% |
+89,600
| New | +$303K |
|
|
SPRT
5017
CALL
DELISTED
support.com, Inc.
SPRT
| $293K | ﹤0.01% |
+76,100
| New | +$276K |
|
|
SRTA
5018
PUT
Strata Critical Medical Inc
SRTA
$421M
| $292K | ﹤0.01% |
27,900
+27,646
| +10,884% | +$273K |
|
5019
PUT
O-I Glass
OI
$1.18B
| $292K | ﹤0.01% |
17,900
+17,768
| +13,461% | +$301K |
|
5020
CALL
Post Holdings
POST
$4.42B
| $292K | ﹤0.01% |
4,126
+4,054
| +5,631% | +$299K |
|
5021
PUT
Rocket Lab Corp
RKLB
$36.6B
| $292K | ﹤0.01% |
+26,900
| New | +$280K |
|
|
ISBC
5022
DELISTED
Investors Bancorp, Inc.
ISBC
| $292K | ﹤0.01% |
+20,503
| New | +$303K |
|
5023
CALL
Aclaris Therapeutics
ACRS
$715M
| $291K | ﹤0.01% |
16,600
+16,572
| +59,186% | +$376K |
|
5024
CALL
BlueLinx
BXC
$430M
| $291K | ﹤0.01% |
5,800
+5,775
| +23,100% | +$284K |
|
5025
Fox Class A
FOXA
$24.8B
| $291K | ﹤0.01% |
7,855
+7,705
| +5,137% | +$289K |
|
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.