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 | |
|---|---|---|---|---|---|---|
5401
Organon & Co
OGN
$3.56B
| $237K | ﹤0.01% |
+7,834
| New | +$258K |
|
5402
PUT
Travel + Leisure Co
TNL
$4.62B
| $237K | ﹤0.01% |
4,000
+3,550
| +789% | +$225K |
|
|
GRTS
5403
CALL
DELISTED
Gritstone bio, Inc. Common Stock
GRTS
| $237K | ﹤0.01% |
26,000
+25,891
| +23,753% | +$239K |
|
|
NMRD
5404
CALL
DELISTED
Nemaura Medical, Inc. Common Stock
NMRD
| $237K | ﹤0.01% |
22,900
+22,895
| +457,900% | +$219K |
|
5405
Qiagen
QGEN
$8.48B
| $236K | ﹤0.01% |
4,601
-501
| -10% | -$25.9K |
|
5406
PUT
Sabesp
SBS
$19.3B
| $236K | ﹤0.01% |
165,009
+158,099
| +2,288% | +$235K |
|
5407
CALL
West Fraser Timber
WFG
$4.96B
| $236K | ﹤0.01% |
+3,300
| New | +$254K |
|
|
TRVN
5408
CALL
DELISTED
Trevena, Inc.
TRVN
| $236K | ﹤0.01% |
224
+222
| +11,100% | +$249K |
|
|
GLOP
5409
PUT
DELISTED
GASLOG PARTNERS LP
GLOP
| $236K | ﹤0.01% |
64,000
+63,730
| +23,604% | +$193K |
|
|
MIME
5410
DELISTED
Mimecast Limited
MIME
| $236K | ﹤0.01% |
4,466
+1,447
| +48% | +$68K |
|
|
ECHO
5411
PUT
DELISTED
Echo Global Logistics, Inc.
ECHO
| $236K | ﹤0.01% |
+7,700
| New | +$254K |
|
5412
CALL
BGC Group
BGC
$5.55B
| $235K | ﹤0.01% |
41,500
+41,184
| +13,033% | +$235K |
|
5413
PUT
Boot Barn
BOOT
$4.53B
| $235K | ﹤0.01% |
2,800
+2,767
| +8,385% | +$203K |
|
|
CMCM
5414
PUT
Cheetah Mobile
CMCM
$88.5M
| $235K | ﹤0.01% |
+19,860
| New | +$223K |
|
5415
Duke Energy
DUK
$98.3B
| $235K | ﹤0.01% |
+2,390
| New | +$240K |
|
5416
PUT
Genesco
GCO
$420M
| $235K | ﹤0.01% |
3,700
+3,673
| +13,604% | +$199K |
|
5417
MillerKnoll
MLKN
$1.51B
| $235K | ﹤0.01% |
5,005
-2,735
| -35% | -$124K |
|
5418
Alaunos Therapeutics
TCRT
$4.66M
| $235K | ﹤0.01% |
595
+40
| +7% | +$18.7K |
|
|
ITI
5419
PUT
DELISTED
Iteris, Inc.
ITI
| $235K | ﹤0.01% |
35,400
+35,199
| +17,512% | +$237K |
|
|
EAR
5420
PUT
DELISTED
Eargo, Inc. Common Stock
EAR
| $235K | ﹤0.01% |
+295
| New | +$247K |
|
|
TRQ
5421
CALL
DELISTED
Turquoise Hill Resources Ltd
TRQ
| $235K | ﹤0.01% |
14,000
+12,860
| +1,128% | +$228K |
|
5422
CALL
Alpha and Omega Semiconductor
AOSL
$944M
| $234K | ﹤0.01% |
7,700
+7,611
| +8,552% | +$234K |
|
5423
FMC
FMC
$1.38B
| $234K | ﹤0.01% |
2,166
-2,986
| -58% | -$346K |
|
5424
Methanex
MEOH
$4.33B
| $234K | ﹤0.01% |
7,092
-2,672
| -27% | -$98.3K |
|
|
AVID
5425
PUT
DELISTED
Avid Technology Inc
AVID
| $234K | ﹤0.01% |
6,000
+5,787
| +2,717% | +$166K |
|
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.