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 | |
|---|---|---|---|---|---|---|
1926
CALL
Hewlett Packard
HPE
$63.2B
| $977K | ﹤0.01% |
654
-493
| -43% | -$7.47K |
|
1927
PUT
Iron Mountain
IRM
$38.2B
| $976K | ﹤0.01% |
312
+196
| +169% | +$6.42K |
|
1928
PUT
Mitek Systems
MITK
$762M
| $976K | ﹤0.01% |
982
+825
| +525% | +$8.8K |
|
1929
PUT
Regenxbio
RGNX
$623M
| $976K | ﹤0.01% |
190
-256
| -57% | -$12.8K |
|
|
VISN
1930
CALL
Vistance Networks Inc
VISN
$2.66B
| $975K | ﹤0.01% |
620
+274
| +79% | +$5.56K |
|
1931
ProShares UltraShort S&P500
SDS
$406M
| $969K | ﹤0.01% |
1,263
-87
| -6% | -$70K |
|
|
SPLK
1932
DELISTED
Splunk Inc
SPLK
| $968K | ﹤0.01% |
7,699
-19,206
| -71% | -$2.44M |
|
1933
CALL
Deckers Outdoor
DECK
$13.3B
| $967K | ﹤0.01% |
330
-228
| -41% | -$5.93K |
|
1934
CALL
JetBlue
JBLU
$1.96B
| $967K | ﹤0.01% |
523
+268
| +105% | +$4.79K |
|
1935
CALL
Regions Financial
RF
$26.3B
| $966K | ﹤0.01% |
647
-1,081
| -63% | -$16K |
|
1936
CALL
Copa Holdings
CPA
$5.56B
| $965K | ﹤0.01% |
99
-54
| -35% | -$4.79K |
|
1937
CALL
AMC Global Media
AMCX
$430M
| $964K | ﹤0.01% |
177
+7
| +4% | +$395 |
|
|
NS
1938
CALL
DELISTED
NuStar Energy L.P.
NS
| $960K | ﹤0.01% |
354
+143
| +68% | +$3.88K |
|
|
GWR
1939
CALL
DELISTED
Genesee & Wyoming Inc.
GWR
| $960K | ﹤0.01% |
96
-207
| -68% | -$18.9K |
|
|
NVRO
1940
PUT
DELISTED
NEVRO CORP.
NVRO
| $959K | ﹤0.01% |
148
-58
| -28% | -$3.61K |
|
1941
PUT
Levi Strauss
LEVI
$9.44B
| $958K | ﹤0.01% |
459
-702
| -60% | -$15.4K |
|
1942
Apollo Global Management
APO
$70.7B
| $957K | ﹤0.01% |
27,910
-11,761
| -30% | -$374K |
|
1943
CALL
Axsome Therapeutics
AXSM
$12.4B
| $957K | ﹤0.01% |
372
-508
| -58% | -$10.2K |
|
1944
PUT
MBIA
MBI
$288M
| $957K | ﹤0.01% |
1,029
-893
| -46% | -$8.33K |
|
1945
CALL
Steel Dynamics
STLD
$35.6B
| $957K | ﹤0.01% |
317
-79
| -20% | -$2.42K |
|
1946
CALL
Dillards
DDS
$8.87B
| $952K | ﹤0.01% |
153
-14
| -8% | -$900 |
|
1947
State Street SPDR S&P Bank ETF
KBE
$1.64B
| $952K | ﹤0.01% |
21,972
-387
| -2% | -$16.8K |
|
|
GRA
1948
CALL
DELISTED
W.R. Grace & Co.
GRA
| $951K | ﹤0.01% |
125
-531
| -81% | -$39.8K |
|
1949
PUT
New York Times
NYT
$11.6B
| $949K | ﹤0.01% |
291
-45
| -13% | -$1.5K |
|
|
SINA
1950
CALL
DELISTED
Sina Corp
SINA
| $948K | ﹤0.01% |
220
+68
| +45% | +$3.56K |
|
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.