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 | |
|---|---|---|---|---|---|---|
4651
McEwen Inc
MUX
$1B
| $364K | ﹤0.01% |
26,402
+3,318
| +14% | +$43.9K |
|
4652
PUT
Rekor Systems
REKR
$82.6M
| $364K | ﹤0.01% |
35,900
+35,599
| +11,827% | +$546K |
|
4653
Constellation Brands
STZ
$22.5B
| $364K | ﹤0.01% |
1,559
-7,582
| -83% | -$1.78M |
|
4654
PUT
Alexandria Real Estate Equities
ARE
$9.37B
| $363K | ﹤0.01% |
2,000
+1,974
| +7,592% | +$353K |
|
4655
PUT
Blackstone Mortgage Trust
BXMT
$2.77B
| $363K | ﹤0.01% |
+11,400
| New | +$367K |
|
4656
CALL
Columbia Sportswear
COLM
$3.25B
| $363K | ﹤0.01% |
3,700
+3,692
| +46,150% | +$387K |
|
4657
iShares Core MSCI EAFE ETF
IEFA
$186B
| $363K | ﹤0.01% |
4,856
+2,927
| +152% | +$221K |
|
4658
PUT
Alaunos Therapeutics
TCRT
$4.64M
| $363K | ﹤0.01% |
917
+910
| +13,000% | +$425K |
|
|
SILK
4659
CALL
DELISTED
Silk Road Medical, Inc. Common Stock
SILK
| $363K | ﹤0.01% |
7,600
+7,433
| +4,451% | +$379K |
|
|
VWE
4660
DELISTED
Vintage Wine Estates, Inc. Common Stock
VWE
| $363K | ﹤0.01% |
+30,319
| New | +$323K |
|
|
QTS
4661
CALL
DELISTED
QTS REALTY TRUST, INC.
QTS
| $363K | ﹤0.01% |
4,700
+4,697
| +156,567% | +$319K |
|
|
CIVI
4662
PUT
DELISTED
Civitas Resources
CIVI
| $362K | ﹤0.01% |
7,700
+7,690
| +76,900% | +$312K |
|
4663
PUT
Lantheus
LNTH
$6.51B
| $362K | ﹤0.01% |
13,100
+12,956
| +8,997% | +$297K |
|
4664
CALL
MannKind Corp
MNKD
$1.19B
| $362K | ﹤0.01% |
+66,600
| New | +$289K |
|
|
TWOU
4665
DELISTED
2U Inc
TWOU
| $362K | ﹤0.01% |
290
+140
| +93% | +$162K |
|
|
CLVS
4666
PUT
DELISTED
Clovis Oncology, Inc.
CLVS
| $362K | ﹤0.01% |
62,500
+61,984
| +12,012% | +$363K |
|
4667
CALL
Copa Holdings
CPA
$5.56B
| $361K | ﹤0.01% |
4,800
+4,793
| +68,471% | +$386K |
|
4668
Dover
DOV
$26.7B
| $361K | ﹤0.01% |
+2,399
| New | +$354K |
|
4669
CALL
Sphere Entertainment
SPHR
$5.02B
| $361K | ﹤0.01% |
4,300
+4,275
| +17,100% | +$378K |
|
4670
CALL
AbCellera Biologics
ABCL
$1.65B
| $360K | ﹤0.01% |
16,400
+16,344
| +29,186% | +$451K |
|
4671
PUT
Standard BioTools
LAB
$342M
| $360K | ﹤0.01% |
58,600
+58,291
| +18,864% | +$312K |
|
4672
ProShares Trust UltraShort Lehman 7-10 Year Treasury
PST
$10.6M
| $360K | ﹤0.01% |
21,990
-16,509
| -43% | -$276K |
|
|
RWT
4673
CALL
Redwood Trust
RWT
$588M
| $360K | ﹤0.01% |
29,900
+29,847
| +56,315% | +$333K |
|
4674
PUT
Uranium Energy
UEC
$4.47B
| $360K | ﹤0.01% |
135,500
+134,440
| +12,683% | +$405K |
|
4675
PUT
US Foods
USFD
$22.5B
| $360K | ﹤0.01% |
9,400
+9,239
| +5,739% | +$358K |
|
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.