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 | |
|---|---|---|---|---|---|---|
876
CALL
HCA Healthcare
HCA
$84.8B
| $3.65M | 0.01% |
270
-1
| -0.4% | -$126 |
|
877
PUT
Caesars Entertainment
CZR
$6.1B
| $3.65M | 0.01% |
792
+337
| +74% | +$16.5K |
|
878
CALL
Gen Digital
GEN
$15.6B
| $3.63M | 0.01% |
1,669
-282
| -14% | -$6.06K |
|
|
MASI
879
CALL
DELISTED
Masimo
MASI
| $3.63M | 0.01% |
244
-152
| -38% | -$20.9K |
|
880
CALL
Kohl's
KSS
$2.03B
| $3.63M | 0.01% |
763
+209
| +38% | +$12.6K |
|
|
SCHW
881
CALL
Charles Schwab
SCHW
$177B
| $3.63M | 0.01% |
902
-323
| -26% | -$14.1K |
|
882
Direxion Daily Gold Miners Index Bull 2X ETF
NUGT
$863M
| $3.62M | 0.01% |
26,416
+21,138
| +400% | +$1.95M |
|
883
CALL
Ingredion
INGR
$6.38B
| $3.62M | 0.01% |
439
+74
| +20% | +$6.36K |
|
884
CALL
AptarGroup
ATR
$8.45B
| $3.62M | 0.01% |
291
-1
| -0.3% | -$114 |
|
885
PUT
iShares Silver Trust
SLV
$28.1B
| $3.61M | 0.01% |
2,522
-325
| -11% | -$4.54K |
|
886
Workday
WDAY
$33.4B
| $3.6M | 0.01% |
17,498
+6,009
| +52% | +$1.21M |
|
|
ZAYO
887
CALL
DELISTED
Zayo Group Holdings, Inc.
ZAYO
| $3.6M | 0.01% |
1,093
-117
| -10% | -$3.73K |
|
888
CALL
Exelixis
EXEL
$13.9B
| $3.59M | 0.01% |
1,682
+87
| +5% | +$1.82K |
|
889
PUT
W.W. Grainger
GWW
$65.3B
| $3.59M | 0.01% |
134
-160
| -54% | -$44.9K |
|
890
PUT
Stanley Black & Decker
SWK
$14.2B
| $3.59M | 0.01% |
248
-309
| -55% | -$43.5K |
|
891
CALL
Edwards Lifesciences
EW
$47.6B
| $3.58M | 0.01% |
582
-957
| -62% | -$57.9K |
|
892
United Airlines
UAL
$38.4B
| $3.58M | 0.01% |
40,849
-2,659
| -6% | -$225K |
|
893
CALL
Xerox
XRX
$337M
| $3.58M | 0.01% |
1,010
-43
| -4% | -$1.44K |
|
|
SPR
894
CALL
DELISTED
Spirit AeroSystems
SPR
| $3.56M | 0.01% |
438
-46
| -10% | -$3.88K |
|
895
Nutanix
NTNX
$14.9B
| $3.56M | 0.01% |
137,105
+26,629
| +24% | +$928K |
|
896
PUT
Harley-Davidson
HOG
$2.68B
| $3.55M | 0.01% |
990
+97
| +11% | +$3.53K |
|
897
PUT
KLA
KLAC
$275B
| $3.54M | 0.01% |
3,000
+2,020
| +206% | +$23.4K |
|
898
CALL
Yelp
YELP
$1.38B
| $3.54M | 0.01% |
1,037
+434
| +72% | +$15K |
|
899
CALL
Enphase Energy
ENPH
$4.84B
| $3.54M | 0.01% |
1,943
+774
| +66% | +$10.7K |
|
900
PUT
RenaissanceRe
RNR
$13.8B
| $3.52M | 0.01% |
+198
| New | +$32.5K |
|
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.