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 | |
|---|---|---|---|---|---|---|
1401
Radware
RDWR
$1.24B
| $1.77M | ﹤0.01% |
71,720
+43,945
| +158% | +$1.1M |
|
1402
CALL
Interactive Brokers
IBKR
$40.9B
| $1.77M | ﹤0.01% |
1,308
+320
| +32% | +$4.34K |
|
1403
PUT
Qiagen
QGEN
$8.53B
| $1.77M | ﹤0.01% |
412
-235
| -36% | -$9.74K |
|
1404
SLB Ltd
SLB
$77.8B
| $1.77M | ﹤0.01% |
+44,555
| New | +$1.8M |
|
|
CS
1405
CALL
DELISTED
Credit Suisse Group
CS
| $1.77M | ﹤0.01% |
1,479
-380
| -20% | -$4.63K |
|
|
BERY
1406
PUT
DELISTED
Berry Global Group, Inc.
BERY
| $1.77M | ﹤0.01% |
366
-83
| -18% | -$4K |
|
|
CIT
1407
PUT
DELISTED
CIT Group Inc.
CIT
| $1.76M | ﹤0.01% |
336
+277
| +469% | +$14K |
|
|
EB
1408
CALL
DELISTED
Eventbrite
EB
| $1.76M | ﹤0.01% |
1,087
+995
| +1,082% | +$18.5K |
|
|
GWPH
1409
PUT
DELISTED
GW Pharmaceuticals Plc American Depositary Shares
GWPH
| $1.76M | ﹤0.01% |
102
-5
| -5% | -$865 |
|
|
WW
1410
CALL
DELISTED
WW International
WW
| $1.75M | ﹤0.01% |
919
+124
| +16% | +$2.46K |
|
1411
CALL
Entergy
ETR
$54.1B
| $1.75M | ﹤0.01% |
340
+262
| +336% | +$12.8K |
|
1412
PUT
Dana Inc
DAN
$2.91B
| $1.74M | ﹤0.01% |
875
+860
| +5,733% | +$15.3K |
|
1413
ING
ING
$93.8B
| $1.74M | ﹤0.01% |
150,776
+3,026
| +2% | +$36.1K |
|
1414
PUT
Enterprise Products Partners
EPD
$83.8B
| $1.74M | ﹤0.01% |
604
+149
| +33% | +$4.29K |
|
1415
PUT
Keysight
KEYS
$54.5B
| $1.74M | ﹤0.01% |
194
-552
| -74% | -$46.9K |
|
|
OPTU
1416
PUT
Optimum Communications Inc
OPTU
$316M
| $1.74M | ﹤0.01% |
715
+683
| +2,134% | +$16.2K |
|
1417
PUT
Canadian Pacific Kansas City
CP
$82B
| $1.74M | ﹤0.01% |
370
+55
| +17% | +$2.46K |
|
|
K
1418
DELISTED
Kellanova
K
| $1.74M | ﹤0.01% |
+34,560
| New | +$1.83M |
|
1419
CALL
Nektar Therapeutics
NKTR
$2.39B
| $1.74M | ﹤0.01% |
33
-1
| -3% | -$501 |
|
1420
CALL
Ambarella
AMBA
$2.99B
| $1.73M | ﹤0.01% |
393
+17
| +5% | +$762 |
|
1421
Crown Castle
CCI
$32.7B
| $1.73M | ﹤0.01% |
13,295
+9,396
| +241% | +$1.21M |
|
|
GOOS
1422
CALL
Canada Goose Holdings
GOOS
$868M
| $1.73M | ﹤0.01% |
447
+214
| +92% | +$9.63K |
|
|
ATSG
1423
CALL
DELISTED
Air Transport Services Group
ATSG
| $1.73M | ﹤0.01% |
709
+263
| +59% | +$6.04K |
|
|
MDSO
1424
DELISTED
Medidata Solutions, Inc.
MDSO
| $1.73M | ﹤0.01% |
19,086
+17,742
| +1,320% | +$1.56M |
|
1425
PUT
Thor Industries
THO
$3.99B
| $1.72M | ﹤0.01% |
295
-5
| -2% | -$303 |
|
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.