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 | |
|---|---|---|---|---|---|---|
|
AVID
4726
CALL
DELISTED
Avid Technology Inc
AVID
| $348K | ﹤0.01% |
8,900
+8,872
| +31,686% | +$255K |
|
|
CDK
4727
DELISTED
CDK Global, Inc.
CDK
| $348K | ﹤0.01% |
+7,004
| New | +$371K |
|
|
KIN
4728
CALL
DELISTED
Kindred Biosciences, Inc.
KIN
| $348K | ﹤0.01% |
38,000
+37,190
| +4,591% | +$216K |
|
4729
PUT
ACM Research
ACMR
$4.51B
| $347K | ﹤0.01% |
10,200
+8,724
| +591% | +$240K |
|
4730
CALL
Aspen Aerogels
ASPN
$339M
| $347K | ﹤0.01% |
11,600
+11,248
| +3,195% | +$230K |
|
4731
PUT
Dentsply Sirona
XRAY
$2.84B
| $347K | ﹤0.01% |
5,500
+5,448
| +10,477% | +$359K |
|
|
YSG
4732
CALL
Yatsen Holding
YSG
$317M
| $347K | ﹤0.01% |
7,420
+7,304
| +6,297% | +$378K |
|
|
PRTY
4733
PUT
DELISTED
Party City Holdco Inc.
PRTY
| $347K | ﹤0.01% |
37,200
+36,752
| +8,204% | +$300K |
|
|
OMP
4734
PUT
DELISTED
Oasis Midstream Partners LP Common Units Representing Limited Partner Interests
OMP
| $347K | ﹤0.01% |
14,800
+14,780
| +73,900% | +$366K |
|
4735
PUT
Apogee Enterprises
APOG
$833M
| $346K | ﹤0.01% |
8,500
+8,441
| +14,307% | +$318K |
|
|
4736
Aspen Aerogels
ASPN
$339M
| $346K | ﹤0.01% |
11,567
-18,337
| -61% | -$374K |
|
4737
PUT
Gaia
GAIA
$46.6M
| $346K | ﹤0.01% |
31,500
+31,246
| +12,302% | +$355K |
|
4738
CALL
Harrow
HROW
$1.44B
| $346K | ﹤0.01% |
37,300
+36,812
| +7,543% | +$314K |
|
4739
PAR Technology
PAR
$716M
| $346K | ﹤0.01% |
4,955
-4,580
| -48% | -$325K |
|
4740
Interface
TILE
$1.95B
| $346K | ﹤0.01% |
22,637
+18,178
| +408% | +$262K |
|
4741
PUT
Cheniere Energy
CQP
$30.5B
| $345K | ﹤0.01% |
7,800
+7,726
| +10,441% | +$325K |
|
|
VWTR
4742
CALL
DELISTED
Vidler Water Resouces, Inc. Common Stock
VWTR
| $345K | ﹤0.01% |
26,000
+25,952
| +54,067% | +$267K |
|
4743
CALL
JELD-WEN Holding
JELD
$110M
| $344K | ﹤0.01% |
13,100
+13,030
| +18,614% | +$369K |
|
4744
OneSpan
OSPN
$584M
| $344K | ﹤0.01% |
+13,505
| New | +$353K |
|
4745
CALL
Personalis
PSNL
$1.25B
| $344K | ﹤0.01% |
13,600
+13,577
| +59,030% | +$311K |
|
|
MKFG
4746
DELISTED
Markforged Holding Corporation
MKFG
| $344K | ﹤0.01% |
+3,454
| New | +$351K |
|
4747
CALL
CorMedix
CRMD
$564M
| $343K | ﹤0.01% |
50,000
+49,631
| +13,450% | +$395K |
|
4748
DHT Holdings
DHT
$2.99B
| $343K | ﹤0.01% |
52,970
-72,872
| -58% | -$447K |
|
4749
CALL
Lipocine
LPCN
$17.1M
| $343K | ﹤0.01% |
14,412
+14,141
| +5,218% | +$333K |
|
|
TWCT
4750
CALL
DELISTED
TWC Tech Holdings II Corp. Class A Common Stock
TWCT
| $343K | ﹤0.01% |
+34,600
| New | +$343K |
|
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.