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 | |
|---|---|---|---|---|---|---|
|
JOYY
3001
PUT
JOYY Inc
JOYY
$3.78B
| $1.07M | ﹤0.01% |
16,300
+16,252
| +33,858% | +$1.38M |
|
|
GBT
3002
DELISTED
Global Blood Therapeutics, Inc.
GBT
| $1.07M | ﹤0.01% |
30,697
+21,574
| +236% | +$842K |
|
3003
Protolabs
PRLB
$1.83B
| $1.07M | ﹤0.01% |
11,708
+4,983
| +74% | +$491K |
|
3004
PUT
Vishay Intertechnology
VSH
$5.42B
| $1.07M | ﹤0.01% |
47,600
+47,449
| +31,423% | +$1.14M |
|
|
EH
3005
PUT
EHang Holdings
EH
$395M
| $1.07M | ﹤0.01% |
24,900
+24,784
| +21,366% | +$754K |
|
3006
PUT
Entegris
ENTG
$18.5B
| $1.07M | ﹤0.01% |
8,700
+8,552
| +5,778% | +$983K |
|
3007
PUT
EPR Properties
EPR
$4.91B
| $1.07M | ﹤0.01% |
20,300
+19,919
| +5,228% | +$990K |
|
|
WCC
3008
PUT
WESCO International
WCC
$15.8B
| $1.07M | ﹤0.01% |
10,400
+10,336
| +16,150% | +$1.03M |
|
|
SFT
3009
PUT
DELISTED
Shift Technologies, Inc. Class A Common Stock
SFT
| $1.07M | ﹤0.01% |
12,470
+12,377
| +13,309% | +$991K |
|
3010
PUT
Paylocity
PCTY
$7.06B
| $1.07M | ﹤0.01% |
5,600
+5,592
| +69,900% | +$1.01M |
|
3011
CALL
Grocery Outlet
GO
$933M
| $1.07M | ﹤0.01% |
30,800
+30,480
| +9,525% | +$1.11M |
|
3012
CALL
Ingredion
INGR
$6.42B
| $1.07M | ﹤0.01% |
11,800
+11,728
| +16,289% | +$1.1M |
|
3013
CALL
A.O. Smith
AOS
$8.59B
| $1.07M | ﹤0.01% |
14,800
+14,745
| +26,809% | +$1.02M |
|
3014
Equity Residential
EQR
$25.5B
| $1.06M | ﹤0.01% |
13,839
-1,009
| -7% | -$76.3K |
|
3015
PUT
Centrus Energy
LEU
$3.32B
| $1.06M | ﹤0.01% |
42,000
+41,789
| +19,805% | +$998K |
|
|
HAPN
3016
PUT
Happen Inc
HAPN
$2.13B
| $1.06M | ﹤0.01% |
58,700
+57,861
| +6,896% | +$899K |
|
3017
PUT
Assured Guaranty
AGO
$3.8B
| $1.06M | ﹤0.01% |
22,400
+21,935
| +4,717% | +$1.03M |
|
3018
CALL
Regency Centers
REG
$15.2B
| $1.06M | ﹤0.01% |
16,600
+16,405
| +8,413% | +$1.04M |
|
|
TGH
3019
CALL
DELISTED
Textainer Group Holdings limited
TGH
| $1.06M | ﹤0.01% |
31,500
+31,327
| +18,108% | +$926K |
|
3020
PUT
Trex
TREX
$4.57B
| $1.06M | ﹤0.01% |
10,400
+10,241
| +6,441% | +$1.03M |
|
3021
CenterPoint Energy
CNP
$28.8B
| $1.06M | ﹤0.01% |
43,302
+31,281
| +260% | +$768K |
|
3022
CALL
LoveSac
LOVE
$248M
| $1.06M | ﹤0.01% |
13,300
+13,267
| +40,203% | +$988K |
|
|
RDUS
3023
CALL
DELISTED
Radius Recycling
RDUS
| $1.06M | ﹤0.01% |
21,600
+21,451
| +14,397% | +$1.07M |
|
|
MUDS
3024
DELISTED
Mudrick Capital Acquisition Corporation II Class A Common Stock
MUDS
| $1.06M | ﹤0.01% |
+85,044
| New | +$1.11M |
|
3025
CALL
Thryv Holdings
THRY
$179M
| $1.06M | ﹤0.01% |
+29,600
| New | +$836K |
|
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.