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 | |
|---|---|---|---|---|---|---|
7476
CALL
Inspire Medical Systems
INSP
$1.47B
| $57K | ﹤0.01% |
300
+297
| +9,900% | +$58.9K |
|
7477
Leidos
LDOS
$14.4B
| $57K | ﹤0.01% |
567
-1,621
| -74% | -$166K |
|
7478
PUT
Legend Biotech
LEGN
$3.65B
| $57K | ﹤0.01% |
1,400
+1,398
| +69,900% | +$47.5K |
|
7479
LivePerson
LPSN
$22M
| $57K | ﹤0.01% |
61
-325
| -84% | -$274K |
|
7480
PUT
MakeMyTrip
MMYT
$5.38B
| $57K | ﹤0.01% |
1,900
+1,819
| +2,246% | +$50.5K |
|
7481
PUT
Natural Health Trends
NHTC
$14.8M
| $57K | ﹤0.01% |
8,200
+8,084
| +6,969% | +$58.5K |
|
7482
CALL
Pilgrim's Pride
PPC
$7.13B
| $57K | ﹤0.01% |
2,600
+2,506
| +2,666% | +$59.7K |
|
7483
CALL
Ultragenyx Pharmaceutical
RARE
$2.46B
| $57K | ﹤0.01% |
600
+497
| +483% | +$51.8K |
|
7484
PUT
Thryv Holdings
THRY
$184M
| $57K | ﹤0.01% |
+1,600
| New | +$45.2K |
|
7485
Zymeworks
ZYME
$1.62B
| $57K | ﹤0.01% |
1,649
-3,826
| -70% | -$121K |
|
|
MARK
7486
DELISTED
Remark Holdings, Inc.
MARK
| $57K | ﹤0.01% |
3,101
-814
| -21% | -$15.2K |
|
|
SJI
7487
CALL
DELISTED
South Jersey Industries, Inc.
SJI
| $57K | ﹤0.01% |
2,200
+2,195
| +43,900% | +$56.6K |
|
|
AGTC
7488
PUT
DELISTED
Applied Genetic Technologies Corporation
AGTC
| $57K | ﹤0.01% |
14,600
+14,558
| +34,662% | +$60.4K |
|
|
NBEV
7489
DELISTED
NewAge, Inc. Common Stock (Delaware)
NBEV
| $57K | ﹤0.01% |
25,690
-7,692
| -23% | -$17.9K |
|
|
NNA
7490
CALL
DELISTED
Navios Maritime Acquisition Corporation
NNA
| $57K | ﹤0.01% |
16,900
+16,695
| +8,144% | +$59.1K |
|
|
GRN
7491
PUT
DELISTED
iPath Global Carbon ETN
GRN
| $57K | ﹤0.01% |
2,000
+1,963
| +5,305% | +$55.9K |
|
7492
Adecoagro
AGRO
$1.4B
| $56K | ﹤0.01% |
+5,600
| New | +$55.7K |
|
7493
Agilysys
AGYS
$3.21B
| $56K | ﹤0.01% |
1,000
+4
| +0.4% | +$207 |
|
7494
Ascendis Pharma A/S
ASND
$16.5B
| $56K | ﹤0.01% |
432
-1,562
| -78% | -$208K |
|
|
LONA
7495
CALL
LeonaBio Inc
LONA
$66.1M
| $56K | ﹤0.01% |
+550
| New | +$96K |
|
7496
CALL
AptarGroup
ATR
$8.69B
| $56K | ﹤0.01% |
400
+396
| +9,900% | +$58.4K |
|
7497
PUT
BioCardia
BCDA
$11.5M
| $56K | ﹤0.01% |
953
+928
| +3,712% | +$56.3K |
|
7498
CuriosityStream
CURI
$148M
| $56K | ﹤0.01% |
4,168
-17,309
| -81% | -$223K |
|
7499
CALL
Encore Capital Group
ECPG
$2.01B
| $56K | ﹤0.01% |
1,200
+1,151
| +2,349% | +$50K |
|
7500
Vaalco Energy
EGY
$562M
| $56K | ﹤0.01% |
17,447
+5,594
| +47% | +$15.4K |
|
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.