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 | Miscellaneous | 97.48% |
| 2 | Technology | 0.51% |
| 3 | Communication Services | 0.5% |
| 4 | Healthcare | 0.37% |
| 5 | Industrials | 0.31% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
951
Fair Isaac
FICO
$20.1B
| $3.29M | 0.01% |
10,490
+6,250
| +147% | +$1.81M |
|
952
CALL
Dentsply Sirona
XRAY
$2.27B
| $3.29M | 0.01% |
563
+197
| +54% | +$10.6K |
|
953
CALL
Eastman Chemical
EMN
$8.14B
| $3.28M | 0.01% |
422
-131
| -24% | -$9.95K |
|
954
CALL
Cummins
CMI
$77.2B
| $3.27M | 0.01% |
191
-53
| -22% | -$8.68K |
|
955
PUT
Guardant Health
GH
$21.7B
| $3.27M | 0.01% |
379
+219
| +137% | +$16.7K |
|
956
CALL
Pool Corp
POOL
$6.73B
| $3.27M | 0.01% |
171
+111
| +185% | +$20K |
|
957
CALL
GDS Holdings
GDS
$6.28B
| $3.26M | 0.01% |
869
+759
| +690% | +$27.6K |
|
958
PUT
AB InBev
BUD
$158B
| $3.25M | 0.01% |
367
-1,485
| -80% | -$127K |
|
959
CALL
Toyota
TM
$233B
| $3.25M | 0.01% |
262
-53
| -17% | -$6.46K |
|
960
CALL
MPLX
MPLX
$60.5B
| $3.24M | 0.01% |
1,008
+184
| +22% | +$5.86K |
|
961
PUT
Dell
DELL
$339B
| $3.24M | 0.01% |
1,259
+247
| +24% | +$7.71K |
|
962
PUT
Microchip Technology
MCHP
$40.3B
| $3.23M | 0.01% |
746
-2,058
| -73% | -$91.4K |
|
963
CALL
Canadian Natural Resources
CNQ
$104B
| $3.23M | 0.01% |
2,444
+1,572
| +180% | +$21.6K |
|
964
PUT
Ascendis Pharma A/S
ASND
$17.7B
| $3.22M | 0.01% |
280
+32
| +13% | +$3.83K |
|
|
LOGM
965
PUT
DELISTED
LogMein, Inc.
LOGM
| $3.22M | 0.01% |
437
-291
| -40% | -$22.5K |
|
966
PUT
Zscaler
ZS
$27.7B
| $3.21M | 0.01% |
419
-88
| -17% | -$6.27K |
|
967
Stanley Black & Decker
SWK
$14.7B
| $3.19M | 0.01% |
22,074
-841
| -4% | -$119K |
|
968
PUT
Live Nation Entertainment
LYV
$40.4B
| $3.19M | 0.01% |
481
-58
| -11% | -$3.73K |
|
969
CALL
Newell Brands
NWL
$2.6B
| $3.18M | 0.01% |
2,065
+381
| +23% | +$5.7K |
|
970
PUT
Advance Auto Parts
AAP
$2.67B
| $3.17M | 0.01% |
206
-33
| -14% | -$5.36K |
|
971
CALL
Elastic
ESTC
$9.64B
| $3.17M | 0.01% |
425
+324
| +321% | +$26.4K |
|
972
Okta
OKTA
$29.8B
| $3.17M | 0.01% |
25,677
+23,931
| +1,371% | +$2.6M |
|
|
MOMO
973
PUT
Hello Group
MOMO
$710M
| $3.17M | 0.01% |
885
+295
| +50% | +$9.81K |
|
|
CONE
974
PUT
DELISTED
CyrusOne Inc Common Stock
CONE
| $3.17M | 0.01% |
549
+528
| +2,514% | +$30.9K |
|
|
VAR
975
CALL
DELISTED
Varian Medical Systems, Inc.
VAR
| $3.16M | 0.01% |
232
+1
| +0.4% | +$134 |
|
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 1,300 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 Miscellaneous at 97% of assets, up from 97% a quarter earlier, followed by Technology and Communication Services.
- 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 1,300 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.