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 |
NVIDIA
NVDA
|
+$29.6M |
| 2 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$22.6M |
| 3 |
iShares Russell 2000 ETF
IWM
|
+$17.9M |
| 4 |
Netflix
NFLX
|
+$17.1M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$13.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco QQQ Trust
QQQ
|
+$123M |
| 2 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$40.6M |
| 3 |
Walt Disney
DIS
|
+$25.6M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$13.5M |
| 5 |
Johnson & Johnson
JNJ
|
+$11.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.5% |
| 2 | Communication Services | 0.5% |
| 3 | Healthcare | 0.35% |
| 4 | Industrials | 0.3% |
| 5 | Consumer Discretionary | 0.26% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2001
PUT
Invesco CurrencyShares Canadian Dollar Trust
FXC
$69.2M
| $896K | ﹤0.01% |
119
+100
| +526% | +$7.38K |
|
|
TVRD
2002
CALL
Tvardi Therapeutics
TVRD
$23.5M
| $896K | ﹤0.01% |
12
+6
| +100% | +$4.22K |
|
|
HEP
2003
PUT
DELISTED
Holly Energy Partners, L.P.
HEP
| $896K | ﹤0.01% |
326
-32
| -9% | -$875 |
|
|
HBI
2004
PUT
DELISTED
Hanesbrands
HBI
| $895K | ﹤0.01% |
520
+311
| +149% | +$5.36K |
|
2005
PUT
AvalonBay Communities
AVB
$27.1B
| $893K | ﹤0.01% |
44
-17
| -28% | -$3.44K |
|
2006
PUT
Lamb Weston
LW
$6.82B
| $893K | ﹤0.01% |
141
-273
| -66% | -$18K |
|
2007
PUT
Rollins
ROL
$18.6B
| $893K | ﹤0.01% |
374
+372
| +18,600% | +$9.59K |
|
2008
PUT
Wolfspeed
WOLF
$1.2B
| $893K | ﹤0.01% |
159
-227
| -59% | -$13.9K |
|
2009
CRA International
CRAI
$1.1B
| $892K | ﹤0.01% |
23,296
+20,590
| +761% | +$890K |
|
2010
MaxLinear
MXL
$6.49B
| $892K | ﹤0.01% |
38,069
+35,639
| +1,467% | +$868K |
|
2011
PUT
Mattel
MAT
$4.17B
| $890K | ﹤0.01% |
794
-821
| -51% | -$9.64K |
|
2012
CALL
Wingstop
WING
$3.68B
| $890K | ﹤0.01% |
94
+6
| +7% | +$489 |
|
2013
PUT
Grand Canyon Education
LOPE
$3.71B
| $889K | ﹤0.01% |
76
-17
| -18% | -$2.03K |
|
2014
Take-Two Interactive
TTWO
$43B
| $889K | ﹤0.01% |
7,838
-11,466
| -59% | -$1.18M |
|
|
LCI
2015
PUT
DELISTED
Lannett Company, Inc.
LCI
| $887K | ﹤0.01% |
366
-15
| -4% | -$396 |
|
|
TCO
2016
PUT
DELISTED
Taubman Centers Inc.
TCO
| $886K | ﹤0.01% |
217
+215
| +10,750% | +$10.3K |
|
2017
CALL
Teck Resources
TECK
$29.5B
| $885K | ﹤0.01% |
384
+129
| +51% | +$2.89K |
|
|
2018
CALL
Mattel
MAT
$4.17B
| $884K | ﹤0.01% |
789
+111
| +16% | +$1.3K |
|
|
RAD
2019
PUT
DELISTED
Rite Aid Corporation
RAD
| $884K | ﹤0.01% |
1,104
+1,086
| +6,033% | +$9.37K |
|
2020
Acadia Pharmaceuticals
ACAD
$4.25B
| $883K | ﹤0.01% |
33,045
-35,136
| -52% | -$898K |
|
2021
PUT
Axalta
AXTA
$7.01B
| $881K | ﹤0.01% |
296
-15
| -5% | -$398 |
|
2022
PUT
Funko
FNKO
$323M
| $881K | ﹤0.01% |
364
+30
| +9% | +$638 |
|
2023
PUT
NiSource
NI
$22.4B
| $881K | ﹤0.01% |
306
+238
| +350% | +$6.7K |
|
2024
CALL
Arrowhead Research
ARWR
$12.1B
| $879K | ﹤0.01% |
332
+135
| +69% | +$2.96K |
|
2025
CALL
Plains GP Holdings
PAGP
$5.23B
| $878K | ﹤0.01% |
352
+30
| +9% | +$725 |
|
Similar funds
Simplex Trading's Q2 2019 Portfolio in Review
As of Q2 2019, Simplex Trading held 8,406 positions worth $36.6B, up 1.9% from $36B the previous quarter. Its ten largest holdings account for 35% of the portfolio.
Simplex Trading's Q2 2019 filing shows 1,261 new, 2,604 increased, 3,015 reduced and 1,301 closed positions. Its largest new stake was iShares 20+ Year Treasury Bond ETF: 105,724 shares worth $14M. The largest sale was Invesco QQQ Trust, an estimated $123M.
By sector, the portfolio is most concentrated in Technology at 0.5% of assets, up from 0.42% a quarter earlier, followed by Communication Services and Healthcare.
- Simplex Trading's largest Q2 2019 buy was iShares 20+ Year Treasury Bond ETF: 105,724 shares worth $14M.
- Simplex Trading added most to NVIDIA in Q2 2019, an estimated $29.6M increase.
- Simplex Trading's biggest Q2 2019 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $40.6M.
- Simplex Trading fully exited Invesco QQQ Trust in Q2 2019, selling an estimated $123M.
- Simplex Trading's ten largest holdings make up 35% of its $36.6B portfolio in Q2 2019.
- Simplex Trading opened 1,261 new positions and closed 1,301 in Q2 2019.
- Simplex Trading's portfolio value rose 1.9% quarter-over-quarter to $36.6B.
Based on Simplex Trading's 13F filing for Q2 2019, filed 26 Jul 2019.