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 | |
|---|---|---|---|---|---|---|
1476
PUT
Brunswick
BC
$5.19B
| $3.67M | ﹤0.01% |
36,800
+36,613
| +19,579% | +$3.73M |
|
1477
CALL
NetApp
NTAP
$32.9B
| $3.66M | ﹤0.01% |
+44,700
| New | +$3.49M |
|
|
CGC
1478
PUT
Canopy Growth
CGC
$375M
| $3.65M | ﹤0.01% |
15,100
+14,838
| +5,663% | +$3.8M |
|
|
XM
1479
CALL
DELISTED
Qualtrics International Inc. Class A Common Stock
XM
| $3.65M | ﹤0.01% |
95,300
+95,177
| +77,380% | +$3.34M |
|
1480
KLA
KLAC
$275B
| $3.64M | ﹤0.01% |
112,240
+98,570
| +721% | +$3.16M |
|
1481
PUT
Lincoln National
LNC
$7.91B
| $3.64M | ﹤0.01% |
57,900
+57,311
| +9,730% | +$3.78M |
|
1482
PUT
Mid-America Apartment Communities
MAA
$15.6B
| $3.64M | ﹤0.01% |
21,600
+21,482
| +18,205% | +$3.42M |
|
1483
CALL
Host Hotels & Resorts
HST
$16.8B
| $3.63M | ﹤0.01% |
212,700
+211,313
| +15,235% | +$3.68M |
|
1484
JD.com
JD
$40.8B
| $3.63M | ﹤0.01% |
45,502
-21,421
| -32% | -$1.61M |
|
|
OSH
1485
CALL
DELISTED
Oak Street Health, Inc.
OSH
| $3.61M | ﹤0.01% |
61,600
+61,113
| +12,549% | +$3.64M |
|
1486
PUT
Hershey
HSY
$35.4B
| $3.6M | ﹤0.01% |
20,700
+20,584
| +17,745% | +$3.47M |
|
1487
PUT
Bread Financial
BFH
$4.21B
| $3.6M | ﹤0.01% |
43,354
+42,712
| +6,653% | +$3.86M |
|
1488
The Mosaic Company
MOS
$7.09B
| $3.6M | ﹤0.01% |
112,964
+6,309
| +6% | +$214K |
|
|
AZPN
1489
PUT
DELISTED
ASPEN TECHNOLOGY INC
AZPN
| $3.6M | ﹤0.01% |
26,200
+25,761
| +5,868% | +$3.54M |
|
1490
PUT
3D Systems Corp
DDD
$420M
| $3.6M | ﹤0.01% |
90,100
+88,471
| +5,431% | +$2.34M |
|
1491
CALL
Neurocrine Biosciences
NBIX
$17.7B
| $3.6M | ﹤0.01% |
37,000
+36,722
| +13,209% | +$3.52M |
|
1492
CALL
Dillards
DDS
$8.87B
| $3.6M | ﹤0.01% |
+19,900
| New | +$2.57M |
|
1493
CALL
Emerson Electric
EMR
$82.9B
| $3.6M | ﹤0.01% |
37,400
+36,803
| +6,165% | +$3.46M |
|
|
XM
1494
PUT
DELISTED
Qualtrics International Inc. Class A Common Stock
XM
| $3.6M | ﹤0.01% |
94,000
+93,845
| +60,545% | +$3.29M |
|
1495
CALL
Hartford Financial Services
HIG
$38.5B
| $3.59M | ﹤0.01% |
58,000
+56,177
| +3,082% | +$3.68M |
|
1496
CALL
Dentsply Sirona
XRAY
$2.59B
| $3.59M | ﹤0.01% |
56,800
+56,480
| +17,650% | +$3.72M |
|
|
ML
1497
CALL
DELISTED
MoneyLion Inc.
ML
| $3.59M | ﹤0.01% |
12,033
+11,923
| +10,839% | +$3.55M |
|
|
TTM.RT
1498
PUT
DELISTED
TATA MOTORS LIMITED RT PUR ADR
TTM.RT
| $3.58M | ﹤0.01% |
157,400
+154,673
| +5,672% | +$3.52M |
|
1499
CALL
Cognex
CGNX
$10.3B
| $3.58M | ﹤0.01% |
42,600
+42,340
| +16,285% | +$3.42M |
|
1500
CALL
ZIM Integrated Shipping Services
ZIM
$3B
| $3.58M | ﹤0.01% |
+79,600
| New | +$3.07M |
|
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.