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 | |
|---|---|---|---|---|---|---|
1951
Marathon Petroleum
MPC
$90.3B
| $947K | ﹤0.01% |
16,948
+1,790
| +12% | +$98K |
|
1952
Banco Santander
SAN
$194B
| $946K | ﹤0.01% |
215,712
+193,259
| +861% | +$868K |
|
|
WCN
1953
CALL
Waste Connections
WCN
$42.8B
| $946K | ﹤0.01% |
99
+77
| +350% | +$7.1K |
|
1954
CALL
DexCom
DXCM
$27.6B
| $943K | ﹤0.01% |
252
-1,384
| -85% | -$43.5K |
|
1955
Bilibili
BILI
$7.18B
| $941K | ﹤0.01% |
57,851
-15,010
| -21% | -$242K |
|
|
UCTT
1956
PUT
Ultra Clean Holdings
UCTT
$4.16B
| $940K | ﹤0.01% |
676
-594
| -47% | -$7.57K |
|
|
WLL
1957
PUT
DELISTED
Whiting Petroleum Corporation
WLL
| $939K | ﹤0.01% |
7
-5
| -42% | -$8.59K |
|
|
TSG
1958
PUT
DELISTED
The Stars Group Inc.
TSG
| $938K | ﹤0.01% |
550
-90
| -14% | -$1.6K |
|
1959
PUT
Henry Schein
HSIC
$9.74B
| $936K | ﹤0.01% |
135
+113
| +514% | +$7.47K |
|
|
SAVE
1960
PUT
DELISTED
Spirit Airlines, Inc.
SAVE
| $935K | ﹤0.01% |
196
+146
| +292% | +$7.44K |
|
1961
CALL
CNX Resources
CNX
$4.85B
| $932K | ﹤0.01% |
1,276
+1,224
| +2,354% | +$10.8K |
|
1962
PUT
CRA International
CRAI
$1.1B
| $931K | ﹤0.01% |
243
+242
| +24,200% | +$10.5K |
|
1963
PUT
PACCAR
PCAR
$69.6B
| $931K | ﹤0.01% |
195
+120
| +160% | +$5.58K |
|
1964
PUT
Pinnacle West Capital
PNW
$12.9B
| $931K | ﹤0.01% |
99
-436
| -81% | -$41.6K |
|
|
CTLP
1965
CALL
DELISTED
Cantaloupe
CTLP
| $930K | ﹤0.01% |
1,253
-136
| -10% | -$842 |
|
|
ANDX
1966
CALL
DELISTED
Andeavor Logistics LP
ANDX
| $930K | ﹤0.01% |
256
+73
| +40% | +$2.56K |
|
1967
CALL
First Majestic Silver
AG
$8.05B
| $929K | ﹤0.01% |
1,175
-212
| -15% | -$1.34K |
|
1968
CALL
KKR & Co
KKR
$89.2B
| $929K | ﹤0.01% |
368
-332
| -47% | -$7.95K |
|
1969
PUT
ON Semiconductor
ON
$33.8B
| $929K | ﹤0.01% |
460
-208
| -31% | -$4.3K |
|
|
SLCA
1970
DELISTED
U.S. SILICA HOLDINGS, INC.
SLCA
| $929K | ﹤0.01% |
72,654
+7,937
| +12% | +$108K |
|
1971
PUT
Air Products & Chemicals
APD
$66.3B
| $928K | ﹤0.01% |
41
-40
| -49% | -$8.28K |
|
1972
CALL
Texas Roadhouse
TXRH
$12.7B
| $928K | ﹤0.01% |
173
+44
| +34% | +$2.47K |
|
1973
Vanguard S&P 500 ETF
VOO
$968B
| $927K | ﹤0.01% |
+3,445
| New | +$911K |
|
1974
PUT
Live Oak Bancshares
LOB
$1.95B
| $926K | ﹤0.01% |
540
+536
| +13,400% | +$8.8K |
|
1975
Vanguard Total World Stock ETF
VT
$76.3B
| $925K | ﹤0.01% |
12,319
+9,622
| +357% | +$713K |
|
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.