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 | |
|---|---|---|---|---|---|---|
1776
NovoCure
NVCR
$2.04B
| $1.16M | ﹤0.01% |
+18,267
| New | +$926K |
|
1777
CALL
Medifast
MED
$108M
| $1.15M | ﹤0.01% |
90
+38
| +73% | +$5.28K |
|
1778
CALL
PBF Energy
PBF
$7.29B
| $1.15M | ﹤0.01% |
369
+77
| +26% | +$2.3K |
|
1779
CALL
Kratos Defense & Security Solutions
KTOS
$8.88B
| $1.15M | ﹤0.01% |
504
+369
| +273% | +$6.96K |
|
1780
CALL
Inspire Medical Systems
INSP
$1.42B
| $1.15M | ﹤0.01% |
190
+188
| +9,400% | +$10.1K |
|
1781
PUT
Plains All American Pipeline
PAA
$17.4B
| $1.15M | ﹤0.01% |
473
+344
| +267% | +$8.21K |
|
1782
CALL
TD Synnex
SNX
$19.4B
| $1.15M | ﹤0.01% |
234
-280
| -54% | -$13.9K |
|
1783
VanEck JP Morgan EM Local Currency Bond ETF
EMLC
$4.74B
| $1.15M | ﹤0.01% |
33,093
-7,233
| -18% | -$242K |
|
1784
Guidewire Software
GWRE
$11.5B
| $1.15M | ﹤0.01% |
11,318
-5,529
| -33% | -$564K |
|
|
PLAN
1785
CALL
DELISTED
Anaplan, Inc.
PLAN
| $1.15M | ﹤0.01% |
227
+37
| +19% | +$1.53K |
|
1786
PUT
Upwork
UPWK
$1.09B
| $1.14M | ﹤0.01% |
711
+172
| +32% | +$2.96K |
|
1787
CALL
AGNC Investment
AGNC
$12.3B
| $1.14M | ﹤0.01% |
679
+536
| +375% | +$9.32K |
|
|
UNIT
1788
CALL
Uniti Group
UNIT
$2.63B
| $1.14M | ﹤0.01% |
1,203
-697
| -37% | -$7.61K |
|
1789
PUT
A10 Networks
ATEN
$2.47B
| $1.14M | ﹤0.01% |
1,672
+59
| +4% | +$387 |
|
1790
CALL
Trex
TREX
$4.51B
| $1.14M | ﹤0.01% |
318
-22
| -6% | -$746 |
|
1791
CALL
Urban Outfitters
URBN
$5.99B
| $1.14M | ﹤0.01% |
501
+41
| +9% | +$1.11K |
|
1792
CALL
Nomad Foods
NOMD
$1.64B
| $1.14M | ﹤0.01% |
533
+5
| +0.9% | +$105 |
|
|
GAP
1793
PUT
The Gap Inc
GAP
$6.84B
| $1.14M | ﹤0.01% |
633
-1,411
| -69% | -$31.6K |
|
1794
PUT
Supernus Pharmaceuticals
SUPN
$2.68B
| $1.13M | ﹤0.01% |
343
+59
| +21% | +$2.02K |
|
1795
CALL
Ally Financial
ALLY
$13.1B
| $1.13M | ﹤0.01% |
364
-1,471
| -80% | -$43.4K |
|
1796
CALL
Aramark
ARMK
$15B
| $1.13M | ﹤0.01% |
434
-41
| -9% | -$959 |
|
1797
PUT
National Fuel Gas
NFG
$7.84B
| $1.13M | ﹤0.01% |
214
+187
| +693% | +$10.6K |
|
1798
PUT
Quanta Services
PWR
$93.9B
| $1.13M | ﹤0.01% |
295
-269
| -48% | -$10.2K |
|
1799
CALL
Chemours
CC
$2.59B
| $1.13M | ﹤0.01% |
469
+304
| +184% | +$8.96K |
|
|
CTRA
1800
PUT
DELISTED
Coterra Energy
CTRA
| $1.13M | ﹤0.01% |
490
-609
| -55% | -$15.5K |
|
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.