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 | |
|---|---|---|---|---|---|---|
1976
PUT
Delek US
DK
$3.87B
| $923K | ﹤0.01% |
228
+74
| +48% | +$2.71K |
|
1977
Northrop Grumman
NOC
$77B
| $923K | ﹤0.01% |
2,857
-6,253
| -69% | -$1.86M |
|
1978
PUT
Cadence Design Systems
CDNS
$90B
| $920K | ﹤0.01% |
130
+82
| +171% | +$5.48K |
|
1979
Toyota
TM
$210B
| $920K | ﹤0.01% |
7,420
+2,309
| +45% | +$282K |
|
1980
PUT
Axsome Therapeutics
AXSM
$12.4B
| $919K | ﹤0.01% |
357
-703
| -66% | -$14.1K |
|
1981
Vanguard FTSE Europe ETF
VGK
$30B
| $919K | ﹤0.01% |
+16,752
| New | +$913K |
|
|
GBT
1982
DELISTED
Global Blood Therapeutics, Inc.
GBT
| $918K | ﹤0.01% |
17,467
+10,062
| +136% | +$578K |
|
1983
Smith & Nephew
SNN
$12.9B
| $917K | ﹤0.01% |
21,076
+13,914
| +194% | +$576K |
|
|
SFIX
1984
PUT
Stitch Fix
SFIX
$478M
| $914K | ﹤0.01% |
286
+55
| +24% | +$1.48K |
|
1985
CALL
Barclays
BCS
$94.1B
| $913K | ﹤0.01% |
1,226
-1,126
| -48% | -$8.89K |
|
1986
CALL
Lamb Weston
LW
$6.82B
| $912K | ﹤0.01% |
144
+54
| +60% | +$3.56K |
|
1987
CALL
Simon Property Group
SPG
$74.5B
| $910K | ﹤0.01% |
57
-512
| -90% | -$88.2K |
|
|
WBT
1988
CALL
DELISTED
Welbilt, Inc.
WBT
| $906K | ﹤0.01% |
543
-817
| -60% | -$13.4K |
|
1989
PUT
A.O. Smith
AOS
$8.38B
| $905K | ﹤0.01% |
192
-336
| -64% | -$16.5K |
|
1990
CALL
SSR Mining
SSRM
$5.57B
| $904K | ﹤0.01% |
662
+379
| +134% | +$4.52K |
|
1991
CALL
Grand Canyon Education
LOPE
$3.71B
| $901K | ﹤0.01% |
77
-243
| -76% | -$29K |
|
1992
United Parcel Service
UPS
$97.6B
| $901K | ﹤0.01% |
+8,728
| New | +$908K |
|
1993
CALL
ABM Industries
ABM
$2.8B
| $900K | ﹤0.01% |
225
-9
| -4% | -$342 |
|
|
TIVO
1994
PUT
DELISTED
Tivo Inc
TIVO
| $899K | ﹤0.01% |
1,220
+285
| +30% | +$2.29K |
|
|
PARA
1995
PUT
DELISTED
Paramount Global Class B
PARA
| $898K | ﹤0.01% |
180
-279
| -61% | -$13.8K |
|
|
DAY
1996
PUT
DELISTED
Dayforce
DAY
| $898K | ﹤0.01% |
179
-146
| -45% | -$7.39K |
|
1997
PUT
Dow Inc
DOW
$21.6B
| $897K | ﹤0.01% |
+182
| New | +$9.61K |
|
1998
CALL
Philips
PHG
$25.4B
| $897K | ﹤0.01% |
259
-652
| -72% | -$20.9K |
|
1999
Sony
SONY
$123B
| $897K | ﹤0.01% |
+85,665
| New | +$841K |
|
2000
CALL
Ziff Davis
ZD
$1.9B
| $897K | ﹤0.01% |
116
+115
| +11,500% | +$8.69K |
|
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.