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 | |
|---|---|---|---|---|---|---|
5926
iShares US Oil & Gas Exploration & Production ETF
IEO
$580M
| $172K | ﹤0.01% |
3,002
+685
| +30% | +$36.3K |
|
5927
CALL
Intrepid Potash
IPI
$456M
| $172K | ﹤0.01% |
5,400
+5,381
| +28,321% | +$159K |
|
|
LTC
5928
PUT
LTC Properties
LTC
$2.06B
| $172K | ﹤0.01% |
4,500
+4,483
| +26,371% | +$182K |
|
5929
CALL
Oramed Pharmaceuticals
ORMP
$167M
| $172K | ﹤0.01% |
+12,900
| New | +$148K |
|
5930
PUT
Pricesmart
PSMT
$5.98B
| $172K | ﹤0.01% |
1,900
+1,882
| +10,456% | +$168K |
|
5931
PUT
SS&C Technologies
SSNC
$18.1B
| $172K | ﹤0.01% |
2,400
+2,318
| +2,827% | +$170K |
|
|
QUOT
5932
PUT
DELISTED
Quotient Technology Inc
QUOT
| $172K | ﹤0.01% |
16,000
+15,743
| +6,126% | +$210K |
|
5933
CALL
AXT Inc
AXTI
$3.95B
| $171K | ﹤0.01% |
15,600
+15,511
| +17,428% | +$165K |
|
5934
CALL
Cue Biopharma
CUE
$113M
| $171K | ﹤0.01% |
490
+489
| +48,900% | +$190K |
|
5935
Standard BioTools
LAB
$340M
| $171K | ﹤0.01% |
27,833
-6,304
| -18% | -$33.7K |
|
5936
PUT
nVent Electric
NVT
$24.9B
| $171K | ﹤0.01% |
5,500
+5,297
| +2,609% | +$163K |
|
|
ORC
5937
CALL
Orchid Island Capital
ORC
$1.3B
| $171K | ﹤0.01% |
6,600
+6,582
| +36,567% | +$183K |
|
5938
iShares Mortgage Real Estate ETF
REM
$539M
| $171K | ﹤0.01% |
+4,625
| New | +$170K |
|
|
SEE
5939
PUT
DELISTED
Sealed Air
SEE
| $171K | ﹤0.01% |
2,900
+2,890
| +28,900% | +$156K |
|
5940
Sprout Social
SPT
$516M
| $171K | ﹤0.01% |
1,923
+1,092
| +131% | +$75.7K |
|
5941
PUT
Sun Communities
SUI
$15.2B
| $171K | ﹤0.01% |
1,000
+989
| +8,991% | +$164K |
|
|
EMAN
5942
DELISTED
eMagin Corporation
EMAN
| $171K | ﹤0.01% |
49,188
+4,870
| +11% | +$15K |
|
|
PRTK
5943
DELISTED
Paratek Pharmaceuticals, Inc.
PRTK
| $171K | ﹤0.01% |
+25,116
| New | +$203K |
|
5944
CALL
Aqua Metals
AQMS
$8.99M
| $170K | ﹤0.01% |
284
+277
| +3,957% | +$169K |
|
|
FRMM
5945
Forum Markets
FRMM
$68.2M
| $170K | ﹤0.01% |
+4
| New | +$141K |
|
5946
PUT
Ligand Pharmaceuticals
LGND
$5.76B
| $170K | ﹤0.01% |
2,084
+2,013
| +2,835% | +$167K |
|
5947
PUT
Milestone Pharmaceuticals
MIST
$138M
| $170K | ﹤0.01% |
31,000
+30,839
| +19,155% | +$175K |
|
5948
CALL
Natera
NTRA
$38.3B
| $170K | ﹤0.01% |
1,500
+1,479
| +7,043% | +$151K |
|
5949
SFL Corp
SFL
$1.64B
| $170K | ﹤0.01% |
22,341
+6,609
| +42% | +$54.1K |
|
|
ASTR
5950
CALL
DELISTED
Astra Space, Inc. Class A Common Stock
ASTR
| $170K | ﹤0.01% |
6,907
+6,733
| +3,870% | +$1.07M |
|
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.