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 | |
|---|---|---|---|---|---|---|
|
XEC
1576
PUT
DELISTED
CIMAREX ENERGY CO
XEC
| $3.3M | ﹤0.01% |
45,500
+45,274
| +20,033% | +$3.06M |
|
1577
PUT
Digital Realty Trust
DLR
$73.7B
| $3.29M | ﹤0.01% |
21,900
+21,654
| +8,802% | +$3.27M |
|
1578
Ralph Lauren
RL
$22.2B
| $3.29M | ﹤0.01% |
+27,949
| New | +$3.5M |
|
1579
CALL
Baker Hughes
BKR
$56.8B
| $3.29M | ﹤0.01% |
143,900
+143,014
| +16,142% | +$3.3M |
|
1580
PUT
AST SpaceMobile
ASTS
$16.8B
| $3.28M | ﹤0.01% |
253,300
+252,083
| +20,713% | +$2.27M |
|
1581
PUT
Public Storage
PSA
$60.2B
| $3.28M | ﹤0.01% |
10,900
+10,872
| +38,829% | +$3.05M |
|
1582
PUT
Unilever
UL
$131B
| $3.28M | ﹤0.01% |
49,778
+49,320
| +10,769% | +$3.28M |
|
|
SI
1583
PUT
DELISTED
Silvergate Capital Corporation
SI
| $3.27M | ﹤0.01% |
28,900
+28,721
| +16,045% | +$3.25M |
|
1584
Stellantis
STLA
$16.5B
| $3.27M | ﹤0.01% |
166,045
+5,443
| +3% | +$102K |
|
1585
PUT
M&T Bank
MTB
$36.2B
| $3.27M | ﹤0.01% |
22,500
+22,214
| +7,767% | +$3.47M |
|
|
PRPB
1586
CALL
DELISTED
CC Neuberger Principal Holdings II Class A Ordinary Shares
PRPB
| $3.27M | ﹤0.01% |
330,300
+322,961
| +4,401% | +$3.2M |
|
1587
CALL
Payoneer
PAYO
$2.41B
| $3.26M | ﹤0.01% |
+314,400
| New | +$3.3M |
|
1588
CALL
STAG Industrial
STAG
$7.86B
| $3.26M | ﹤0.01% |
87,100
+87,085
| +580,567% | +$3.17M |
|
1589
PUT
KKR & Co
KKR
$89.2B
| $3.26M | ﹤0.01% |
55,000
+54,530
| +11,602% | +$3.03M |
|
1590
CALL
Aflac
AFL
$63.9B
| $3.25M | ﹤0.01% |
60,600
+59,643
| +6,232% | +$3.25M |
|
1591
BILL Holdings
BILL
$4.33B
| $3.25M | ﹤0.01% |
17,747
+13,419
| +310% | +$2.1M |
|
1592
PUT
American Water Works
AWK
$26.3B
| $3.24M | ﹤0.01% |
21,000
+20,501
| +4,108% | +$3.19M |
|
|
SGEN
1593
CALL
DELISTED
Seagen Inc. Common Stock
SGEN
| $3.24M | ﹤0.01% |
20,500
+20,424
| +26,874% | +$3.03M |
|
1594
PUT
Churchill Downs
CHDN
$6.03B
| $3.23M | ﹤0.01% |
32,600
+32,300
| +10,767% | +$3.32M |
|
1595
CALL
Invesco DB Commodity Index Tracking Fund
DBC
$1.73B
| $3.23M | ﹤0.01% |
167,600
+166,981
| +26,976% | +$3.05M |
|
1596
PUT
Smith & Wesson
SWBI
$655M
| $3.22M | ﹤0.01% |
93,100
+92,455
| +14,334% | +$1.94M |
|
1597
PUT
Sony
SONY
$123B
| $3.22M | ﹤0.01% |
165,500
+163,825
| +9,781% | +$3.32M |
|
1598
CALL
Anavex Life Sciences
AVXL
$222M
| $3.21M | ﹤0.01% |
+140,600
| New | +$2.08M |
|
1599
PUT
Vanguard Dividend Appreciation ETF
VIG
$111B
| $3.2M | ﹤0.01% |
20,700
+20,425
| +7,427% | +$3.13M |
|
1600
PUT
Celsius Holdings
CELH
$6.93B
| $3.2M | ﹤0.01% |
126,300
+124,851
| +8,616% | +$2.54M |
|
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.