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 | |
|---|---|---|---|---|---|---|
6601
CALL
Golar LNG
GLNG
$5B
| $109K | ﹤0.01% |
8,300
+8,223
| +10,679% | +$97.9K |
|
6602
VanEck High Yield Muni ETF
HYD
$4.43B
| $109K | ﹤0.01% |
+1,715
| New | +$108K |
|
6603
Amplify BlueStar Israel Technology ETF
ITEQ
$112M
| $109K | ﹤0.01% |
+1,559
| New | +$104K |
|
|
LDTC
6604
CALL
DELISTED
LeddarTech
LDTC
| $109K | ﹤0.01% |
+22,600
| New | +$110K |
|
6605
PUT
Malibu Boats
MBUU
$541M
| $109K | ﹤0.01% |
1,500
+1,396
| +1,342% | +$111K |
|
6606
PUT
OR Royalties Inc
OR
$5.58B
| $109K | ﹤0.01% |
8,000
+7,454
| +1,365% | +$99.7K |
|
6607
CALL
Plexus
PLXS
$6.72B
| $109K | ﹤0.01% |
+1,200
| New | +$112K |
|
6608
PUT
Superior Group of Companies
SGC
$185M
| $109K | ﹤0.01% |
+4,600
| New | +$116K |
|
6609
Urban Edge Properties
UE
$2.86B
| $109K | ﹤0.01% |
5,714
+5,615
| +5,672% | +$106K |
|
|
AGTC
6610
CALL
DELISTED
Applied Genetic Technologies Corporation
AGTC
| $109K | ﹤0.01% |
28,100
+27,487
| +4,484% | +$114K |
|
|
JPGE
6611
CALL
DELISTED
JPMorgan Diversified Return Global Equity ETF
JPGE
| $109K | ﹤0.01% |
1,800
+1,683
| +1,438% | +$102K |
|
6612
CALL
Arbutus Biopharma
ABUS
$857M
| $108K | ﹤0.01% |
+35,900
| New | +$111K |
|
6613
PUT
Assembly Biosciences
ASMB
$498M
| $108K | ﹤0.01% |
2,333
+2,323
| +23,230% | +$115K |
|
6614
CALL
Corbus Pharmaceuticals
CRBP
$166M
| $108K | ﹤0.01% |
1,980
+1,941
| +4,977% | +$108K |
|
6615
eGain
EGAN
$187M
| $108K | ﹤0.01% |
9,425
+4,275
| +83% | +$43.7K |
|
6616
iShares MSCI France ETF
EWQ
$335M
| $108K | ﹤0.01% |
2,877
+231
| +9% | +$8.74K |
|
6617
PUT
Identive
INVE
$63.4M
| $108K | ﹤0.01% |
6,400
+6,397
| +213,233% | +$96.6K |
|
6618
PUT
Korn Ferry
KFY
$4.18B
| $108K | ﹤0.01% |
+1,500
| New | +$99.8K |
|
6619
CALL
LiveOne
LVO
$61M
| $108K | ﹤0.01% |
2,300
+2,255
| +5,011% | +$97.9K |
|
6620
PUT
Global X MSCI Norway ETF
NORW
$88M
| $108K | ﹤0.01% |
5,000
+4,880
| +4,067% | +$149K |
|
6621
CALL
Primoris Services
PRIM
$4.58B
| $108K | ﹤0.01% |
3,700
+3,686
| +26,329% | +$119K |
|
6622
CALL
Reading International Class A
RDI
$33.2M
| $108K | ﹤0.01% |
15,600
+15,421
| +8,615% | +$97.5K |
|
6623
CALL
Solid Biosciences
SLDB
$794M
| $108K | ﹤0.01% |
1,973
+1,867
| +1,761% | +$123K |
|
6624
PUT
Vir Biotechnology
VIR
$1.46B
| $108K | ﹤0.01% |
2,296
+2,123
| +1,227% | +$96.5K |
|
|
HT
6625
PUT
DELISTED
Hersha Hospitality Trust Priority Class A Common Shares of Beneficial Interest
HT
| $108K | ﹤0.01% |
10,100
+10,019
| +12,369% | +$111K |
|
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.