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 | |
|---|---|---|---|---|---|---|
1676
Valero Energy
VLO
$89.8B
| $2.99M | ﹤0.01% |
+38,339
| New | +$2.97M |
|
|
HBI
1677
CALL
DELISTED
Hanesbrands
HBI
| $2.98M | ﹤0.01% |
159,900
+158,680
| +13,007% | +$3.14M |
|
1678
Bloom Energy
BE
$52.6B
| $2.98M | ﹤0.01% |
110,911
+58,662
| +112% | +$1.42M |
|
1679
PUT
Scotiabank
BNS
$106B
| $2.98M | ﹤0.01% |
45,800
+45,686
| +40,075% | +$2.95M |
|
|
MUDS
1680
PUT
DELISTED
Mudrick Capital Acquisition Corporation II Class A Common Stock
MUDS
| $2.98M | ﹤0.01% |
+238,900
| New | +$3.11M |
|
1681
ProShares Trust UltraShort Lehman 20+ Year Treasury
TBT
$293M
| $2.97M | ﹤0.01% |
157,894
+41,148
| +35% | +$838K |
|
1682
PUT
Northern Trust
NTRS
$22.2B
| $2.97M | ﹤0.01% |
25,700
+25,671
| +88,521% | +$2.94M |
|
1683
CALL
Ollie's Bargain Outlet
OLLI
$4.01B
| $2.97M | ﹤0.01% |
35,300
+34,973
| +10,695% | +$3.04M |
|
1684
PUT
Sarepta Therapeutics
SRPT
$1.66B
| $2.97M | ﹤0.01% |
+38,200
| New | +$2.9M |
|
1685
CALL
GoDaddy
GDDY
$12.3B
| $2.96M | ﹤0.01% |
34,000
+33,869
| +25,854% | +$2.83M |
|
1686
PUT
Iron Mountain
IRM
$38.2B
| $2.95M | ﹤0.01% |
+69,800
| New | +$2.93M |
|
1687
PUT
FuelCell Energy
FCEL
$1.7B
| $2.95M | ﹤0.01% |
11,057
+10,945
| +9,772% | +$3.2M |
|
1688
KraneShares CSI China Internet ETF
KWEB
$5.2B
| $2.95M | ﹤0.01% |
42,312
-28,497
| -40% | -$2.05M |
|
|
MNDT
1689
DELISTED
Mandiant, Inc. Common Stock
MNDT
| $2.95M | ﹤0.01% |
145,846
-28,971
| -17% | -$594K |
|
1690
PUT
Arrow Electronics
ARW
$10.9B
| $2.95M | ﹤0.01% |
25,900
+25,849
| +50,684% | +$3.03M |
|
1691
CALL
ZTO Express
ZTO
$18.2B
| $2.95M | ﹤0.01% |
+97,100
| New | +$3M |
|
1692
Ferrari
RACE
$63.3B
| $2.94M | ﹤0.01% |
14,293
-4,874
| -25% | -$1.02M |
|
1693
CALL
CarMax
KMX
$8.27B
| $2.94M | ﹤0.01% |
+22,800
| New | +$2.82M |
|
1694
CALL
Centene
CNC
$31.3B
| $2.94M | ﹤0.01% |
40,300
+40,164
| +29,532% | +$2.75M |
|
1695
PUT
Viatris
VTRS
$20.1B
| $2.94M | ﹤0.01% |
+205,700
| New | +$2.98M |
|
|
PLL
1696
PUT
DELISTED
Piedmont Lithium
PLL
| $2.94M | ﹤0.01% |
+37,600
| New | +$2.55M |
|
1697
PUT
QuidelOrtho
QDEL
$1.09B
| $2.93M | ﹤0.01% |
22,900
+22,264
| +3,501% | +$2.62M |
|
1698
CALL
AST SpaceMobile
ASTS
$16.8B
| $2.93M | ﹤0.01% |
226,400
+224,018
| +9,405% | +$2.02M |
|
|
HOUS
1699
PUT
DELISTED
Anywhere Real Estate
HOUS
| $2.93M | ﹤0.01% |
160,800
+159,420
| +11,552% | +$2.72M |
|
1700
CALL
Revolve Group
RVLV
$1.79B
| $2.93M | ﹤0.01% |
42,500
+41,122
| +2,984% | +$2.21M |
|
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.