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 | |
|---|---|---|---|---|---|---|
8976
iShares Core MSCI Europe ETF
IEUR
$8.66B
| $12K | ﹤0.01% |
219
+130
| +146% | +$7.49K |
|
8977
IRIDEX
IRIX
$15.5M
| $12K | ﹤0.01% |
+1,827
| New | +$13.9K |
|
|
JFIN
8978
Jiayin Group
JFIN
$113M
| $12K | ﹤0.01% |
+2,300
| New | +$14.1K |
|
8979
Kimco Realty
KIM
$17.6B
| $12K | ﹤0.01% |
612
-19,286
| -97% | -$400K |
|
8980
PUT
MIND Technology
MIND
$50.4M
| $12K | ﹤0.01% |
650
+630
| +3,150% | +$14K |
|
8981
PUT
Merit Medical Systems
MMSI
$4.43B
| $12K | ﹤0.01% |
+200
| New | +$12.4K |
|
8982
Matrix Service
MTRX
$347M
| $12K | ﹤0.01% |
1,191
-2,440
| -67% | -$29.4K |
|
8983
CALL
Nkarta
NKTX
$162M
| $12K | ﹤0.01% |
400
+358
| +852% | +$10.3K |
|
8984
Nelnet
NNI
$4.79B
| $12K | ﹤0.01% |
168
-916
| -85% | -$68.8K |
|
|
ADAM
8985
Adamas Trust
ADAM
$777M
| $12K | ﹤0.01% |
725
| – | – |
|
8986
Precigen
PGEN
$1.93B
| $12K | ﹤0.01% |
1,931
-9,450
| -83% | -$66K |
|
8987
PUT
Phreesia
PHR
$632M
| $12K | ﹤0.01% |
+200
| New | +$10.4K |
|
|
PNNT
8988
PUT
Pennant Park Investment Corp
PNNT
$215M
| $12K | ﹤0.01% |
1,800
+1,534
| +577% | +$10.1K |
|
8989
ProShares UltraShort Bloomberg Crude Oil
SCO
$585M
| $12K | ﹤0.01% |
34
-69
| -67% | -$31.2K |
|
8990
PUT
Silgan Holdings
SLGN
$4.91B
| $12K | ﹤0.01% |
+300
| New | +$12.7K |
|
|
SNCR
8991
CALL
DELISTED
Synchronoss Technologies
SNCR
| $12K | ﹤0.01% |
378
+375
| +12,500% | +$10.5K |
|
|
SYBX
8992
CALL
DELISTED
Synlogic
SYBX
| $12K | ﹤0.01% |
220
+219
| +21,900% | +$12K |
|
8993
PUT
TIM SA
TIMB
$10.2B
| $12K | ﹤0.01% |
1,100
+1,023
| +1,329% | +$11.9K |
|
8994
iShares 10-20 Year Treasury Bond ETF
TLH
$11B
| $12K | ﹤0.01% |
82
-958
| -92% | -$137K |
|
8995
CALL
Terreno Realty
TRNO
$7.68B
| $12K | ﹤0.01% |
+200
| New | +$12.7K |
|
8996
CALL
Mammoth Energy Services
TUSK
$132M
| $12K | ﹤0.01% |
2,800
+2,777
| +12,074% | +$11.4K |
|
8997
CALL
Visteon
VC
$2.77B
| $12K | ﹤0.01% |
+100
| New | +$12K |
|
|
ATYR
8998
PUT
aTyr Pharma
ATYR
$46.4M
| $12K | ﹤0.01% |
+2,600
| New | +$11.1K |
|
|
SCWX
8999
CALL
DELISTED
SecureWorks Corp Class A Common Stock
SCWX
| $12K | ﹤0.01% |
700
+681
| +3,584% | +$10.6K |
|
|
TAST
9000
PUT
DELISTED
Carrols Restaurant Group, Inc.
TAST
| $12K | ﹤0.01% |
2,100
+2,098
| +104,900% | +$12.4K |
|
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.