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 | |
|---|---|---|---|---|---|---|
|
LUXA
4276
PUT
DELISTED
Lux Health Tech Acquisition Corp. Class A Common Stock
LUXA
| $465K | ﹤0.01% |
47,100
+47,084
| +294,275% | +$474K |
|
4277
PUT
Century Aluminum
CENX
$4.24B
| $464K | ﹤0.01% |
+36,000
| New | +$518K |
|
4278
CALL
Community Health Systems
CYH
$393M
| $464K | ﹤0.01% |
30,100
+29,691
| +7,259% | +$403K |
|
4279
CALL
Dine Brands
DIN
$462M
| $464K | ﹤0.01% |
5,200
+5,081
| +4,270% | +$470K |
|
4280
Moody's
MCO
$84.5B
| $464K | ﹤0.01% |
+1,283
| New | +$427K |
|
4281
UBS Group
UBS
$172B
| $464K | ﹤0.01% |
30,264
-11,867
| -28% | -$187K |
|
|
NVRO
4282
CALL
DELISTED
NEVRO CORP.
NVRO
| $464K | ﹤0.01% |
2,800
+2,745
| +4,991% | +$428K |
|
4283
Herc Holdings
HRI
$4.67B
| $463K | ﹤0.01% |
4,138
+1,434
| +53% | +$152K |
|
4284
Medifast
MED
$108M
| $463K | ﹤0.01% |
1,638
+1,190
| +266% | +$322K |
|
|
MTTR
4285
CALL
DELISTED
Matterport, Inc. Class A Common Stock
MTTR
| $463K | ﹤0.01% |
180,000
+179,617
| +46,897% | +$2.43M |
|
|
ASXC
4286
DELISTED
Asensus Surgical, Inc.
ASXC
| $463K | ﹤0.01% |
146,210
-15,934
| -10% | -$39.8K |
|
|
KSU
4287
DELISTED
Kansas City Southern
KSU
| $462K | ﹤0.01% |
1,631
-248
| -13% | -$71.6K |
|
4288
PUT
Pitney Bowes
PBI
$2.4B
| $461K | ﹤0.01% |
52,600
+51,468
| +4,547% | +$429K |
|
4289
State Street Energy Select Sector SPDR ETF
XLE
$39.3B
| $461K | ﹤0.01% |
17,150
-152,644
| -90% | -$3.97M |
|
4290
CALL
DHT Holdings
DHT
$2.97B
| $460K | ﹤0.01% |
70,900
+70,389
| +13,775% | +$432K |
|
4291
PUT
IQVIA
IQV
$41.1B
| $460K | ﹤0.01% |
1,900
+1,829
| +2,576% | +$422K |
|
|
MASI
4292
CALL
DELISTED
Masimo
MASI
| $460K | ﹤0.01% |
1,900
+1,881
| +9,900% | +$429K |
|
4293
PUT
Navient
NAVI
$824M
| $460K | ﹤0.01% |
23,800
+23,242
| +4,165% | +$399K |
|
4294
PUT
NovaGold Resources
NG
$2.5B
| $460K | ﹤0.01% |
57,500
+56,810
| +8,233% | +$535K |
|
4295
PUT
PTC Therapeutics
PTCT
$6.21B
| $460K | ﹤0.01% |
10,900
+10,899
| +1,089,900% | +$467K |
|
4296
Direxion Daily Regional Banks Bull 3X ETF
DPST
$467M
| $459K | ﹤0.01% |
1,077
-2,443
| -69% | -$1.21M |
|
|
JAMF
4297
CALL
DELISTED
Jamf
JAMF
| $459K | ﹤0.01% |
13,700
+13,553
| +9,220% | +$462K |
|
|
SVC
4298
CALL
Service Properties Trust
SVC
$1.09B
| $459K | ﹤0.01% |
+7,300
| New | +$453K |
|
|
AUY
4299
CALL
DELISTED
Yamana Gold, Inc.
AUY
| $459K | ﹤0.01% |
108,900
+108,164
| +14,696% | +$524K |
|
4300
Robert Half
RHI
$4.16B
| $458K | ﹤0.01% |
5,152
+2,997
| +139% | +$261K |
|
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.