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 | |
|---|---|---|---|---|---|---|
|
AIOT
6251
PowerFleet Inc
AIOT
$526M
| $139K | ﹤0.01% |
19,321
-7,250
| -27% | -$52.9K |
|
|
NARI
6252
CALL
DELISTED
Inari Medical, Inc. Common Stock
NARI
| $139K | ﹤0.01% |
1,500
+1,489
| +13,536% | +$144K |
|
6253
CALL
Arlo Technologies
ARLO
$1.6B
| $138K | ﹤0.01% |
20,400
+20,272
| +15,838% | +$132K |
|
6254
Copa Holdings
CPA
$5.76B
| $138K | ﹤0.01% |
+1,843
| New | +$148K |
|
6255
CorVel
CRVL
$3.06B
| $138K | ﹤0.01% |
+3,096
| New | +$122K |
|
6256
PUT
Grocery Outlet
GO
$909M
| $138K | ﹤0.01% |
4,000
+3,979
| +18,948% | +$145K |
|
6257
CALL
Group 1 Automotive
GPI
$3.42B
| $138K | ﹤0.01% |
900
+701
| +352% | +$113K |
|
6258
CALL
Standard BioTools
LAB
$340M
| $138K | ﹤0.01% |
22,500
+21,941
| +3,925% | +$117K |
|
6259
PUT
Middlesex Water
MSEX
$1.08B
| $138K | ﹤0.01% |
1,700
+1,699
| +169,900% | +$141K |
|
|
NAK
6260
CALL
Northern Dynasty Minerals
NAK
$784M
| $138K | ﹤0.01% |
+280,700
| New | +$158K |
|
|
SY
6261
CALL
So-Young International
SY
$185M
| $138K | ﹤0.01% |
14,400
+14,391
| +159,900% | +$133K |
|
|
ITI
6262
DELISTED
Iteris, Inc.
ITI
| $138K | ﹤0.01% |
20,864
-7,564
| -27% | -$51K |
|
|
RPAI
6263
CALL
DELISTED
RETAIL PROPERTIES OF AMERICA, INC.
RPAI
| $138K | ﹤0.01% |
12,100
+10,421
| +621% | +$122K |
|
6264
CALL
Cars.com
CARS
$662M
| $137K | ﹤0.01% |
9,600
+9,432
| +5,614% | +$131K |
|
6265
CALL
Karyopharm Therapeutics
KPTI
$43.5M
| $137K | ﹤0.01% |
+887
| New | +$129K |
|
6266
CALL
Navigator Holdings
NVGS
$1.38B
| $137K | ﹤0.01% |
12,600
+12,582
| +69,900% | +$133K |
|
|
PBT
6267
CALL
Permian Basin Royalty Trust
PBT
$1.38B
| $137K | ﹤0.01% |
+24,500
| New | +$107K |
|
6268
PUT
RPC Inc
RES
$1.24B
| $137K | ﹤0.01% |
27,800
+27,766
| +81,665% | +$150K |
|
6269
Sensata Technologies
ST
$6.74B
| $137K | ﹤0.01% |
+2,368
| New | +$138K |
|
6270
Tennant Co
TNC
$1.43B
| $137K | ﹤0.01% |
1,724
+100
| +6% | +$8.18K |
|
6271
PUT
10x Genomics
TXG
$6B
| $137K | ﹤0.01% |
700
+696
| +17,400% | +$126K |
|
|
BRMK
6272
DELISTED
Broadmark Realty Capital Inc. Common Stock
BRMK
| $137K | ﹤0.01% |
12,976
+11,247
| +650% | +$119K |
|
|
VEDL
6273
PUT
DELISTED
Vedanta Limited American Depostary Shares (Each representing four equity shares)
VEDL
| $137K | ﹤0.01% |
9,700
+9,609
| +10,559% | +$135K |
|
6274
CALL
Airgain
AIRG
$73.4M
| $136K | ﹤0.01% |
6,600
+6,538
| +10,545% | +$135K |
|
|
FABC
6275
PUT
Fabric.AI Inc
FABC
$16.6M
| $136K | ﹤0.01% |
218
+216
| +10,800% | +$142K |
|
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.