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 | |
|---|---|---|---|---|---|---|
4901
PUT
PAR Technology
PAR
$716M
| $314K | ﹤0.01% |
4,500
+4,452
| +9,275% | +$315K |
|
4902
PUT
Riverview Bancorp
RVSB
$107M
| $314K | ﹤0.01% |
44,300
+44,133
| +26,427% | +$305K |
|
|
TWO
4903
PUT
Two Harbors Investment
TWO
$1.27B
| $314K | ﹤0.01% |
10,400
+9,959
| +2,258% | +$297K |
|
|
HEP
4904
CALL
DELISTED
Holly Energy Partners, L.P.
HEP
| $314K | ﹤0.01% |
13,900
+13,787
| +12,201% | +$292K |
|
|
NEWR
4905
PUT
DELISTED
New Relic, Inc.
NEWR
| $314K | ﹤0.01% |
4,700
+4,077
| +654% | +$263K |
|
|
AAT
4906
PUT
American Assets Trust
AAT
$1.46B
| $313K | ﹤0.01% |
8,400
+8,189
| +3,881% | +$292K |
|
4907
W.P. Carey
WPC
$17B
| $313K | ﹤0.01% |
4,291
-4,720
| -52% | -$345K |
|
|
ONCT
4908
PUT
DELISTED
Oncternal Therapeutics, Inc. Common Stock
ONCT
| $313K | ﹤0.01% |
3,300
+3,288
| +27,400% | +$390K |
|
4909
Aramark
ARMK
$15B
| $312K | ﹤0.01% |
+11,610
| New | +$319K |
|
4910
Goodyear
GT
$2.09B
| $312K | ﹤0.01% |
+18,215
| New | +$336K |
|
4911
HCI Group
HCI
$2.34B
| $312K | ﹤0.01% |
3,139
+1,272
| +68% | +$103K |
|
4912
CALL
PennantPark Floating Rate Capital
PFLT
$698M
| $312K | ﹤0.01% |
24,600
+24,553
| +52,240% | +$310K |
|
4913
PUT
QuinStreet
QNST
$927M
| $312K | ﹤0.01% |
16,800
+16,763
| +45,305% | +$318K |
|
4914
ProShares Ultra Gold
UGL
$649M
| $312K | ﹤0.01% |
21,812
-29,244
| -57% | -$443K |
|
|
DBD
4915
PUT
DELISTED
Diebold Nixdorf Incorporated
DBD
| $312K | ﹤0.01% |
24,300
+23,695
| +3,917% | +$325K |
|
|
MIME
4916
PUT
DELISTED
Mimecast Limited
MIME
| $312K | ﹤0.01% |
5,900
+5,880
| +29,400% | +$276K |
|
4917
PUT
Aspen Aerogels
ASPN
$339M
| $311K | ﹤0.01% |
10,400
+10,385
| +69,233% | +$212K |
|
4918
CALL
Core Laboratories
CLB
$455M
| $311K | ﹤0.01% |
8,000
+7,950
| +15,900% | +$285K |
|
4919
PUT
Medifast
MED
$107M
| $311K | ﹤0.01% |
1,100
+1,097
| +36,567% | +$297K |
|
4920
PUT
NeoGenomics
NEO
$1.96B
| $311K | ﹤0.01% |
+6,900
| New | +$306K |
|
|
RMO
4921
PUT
DELISTED
Romeo Power, Inc.
RMO
| $311K | ﹤0.01% |
38,300
+37,523
| +4,829% | +$320K |
|
4922
PUT
AES
AES
$10.6B
| $310K | ﹤0.01% |
11,900
+11,823
| +15,355% | +$312K |
|
4923
PUT
Guardant Health
GH
$19.1B
| $310K | ﹤0.01% |
2,500
+2,466
| +7,253% | +$332K |
|
|
LKFT
4924
PUT
Lakefront Biotherapeutics American Depositary Shares
LKFT
$1.82B
| $310K | ﹤0.01% |
4,500
+4,340
| +2,713% | +$331K |
|
|
NCTY
4925
PUT
The9 Ltd
NCTY
$66.6M
| $310K | ﹤0.01% |
2,180
+2,140
| +5,350% | +$388K |
|
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.