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 |
iShares Russell 2000 ETF
IWM
|
+$58.5M |
| 2 |
Alphabet (Google) Class C
GOOG
|
+$56.5M |
| 3 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$44.1M |
| 4 |
Apple
AAPL
|
+$20.3M |
| 5 |
State Street SPDR S&P Oil & Gas Exploration & Production ETF
XOP
|
+$12.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$109M |
| 2 |
Meta Platforms (Facebook)
META
|
+$62.3M |
| 3 |
Invesco QQQ Trust
QQQ
|
+$36.2M |
| 4 |
Goldman Sachs
GS
|
+$27.1M |
| 5 |
Boeing
BA
|
+$24.7M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 0.49% |
| 2 | Consumer Discretionary | 0.48% |
| 3 | Technology | 0.4% |
| 4 | Financials | 0.25% |
| 5 | Industrials | 0.22% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1626
PUT
Yum! Brands
YUM
$41B
| $1M | ﹤0.01% |
109
-246
| -69% | -$22K |
|
1627
JetBlue
JBLU
$1.96B
| $997K | ﹤0.01% |
+62,090
| New | +$1.08M |
|
1628
CALL
YPF
YPF
$20.2B
| $997K | ﹤0.01% |
745
-336
| -31% | -$4.94K |
|
1629
PUT
AGCO
AGCO
$8.78B
| $996K | ﹤0.01% |
179
+34
| +23% | +$1.92K |
|
1630
CALL
Regions Financial
RF
$26.3B
| $996K | ﹤0.01% |
745
-154
| -17% | -$2.47K |
|
1631
PUT
Snap
SNAP
$7.32B
| $995K | ﹤0.01% |
1,806
-5,433
| -75% | -$35.3K |
|
1632
PUT
Sociedad Química y Minera de Chile
SQM
$19.6B
| $991K | ﹤0.01% |
259
-210
| -45% | -$9.05K |
|
|
SCIU
1633
PUT
DELISTED
Global X Scientific Beta US ETF
SCIU
| $990K | ﹤0.01% |
471
+321
| +214% | +$9.88K |
|
1634
Noodles & Co
NDLS
$90.5M
| $989K | ﹤0.01% |
+17,688
| New | +$1.32M |
|
|
LLL
1635
CALL
DELISTED
L3 Technologies, Inc.
LLL
| $989K | ﹤0.01% |
57
+42
| +280% | +$8.09K |
|
1636
Seagate
STX
$193B
| $988K | ﹤0.01% |
25,620
+25,520
| +25,520% | +$1.07M |
|
1637
PUT
Zebra Technologies
ZBRA
$12.4B
| $987K | ﹤0.01% |
62
-209
| -77% | -$34.8K |
|
|
TELL
1638
CALL
DELISTED
Tellurian Inc.
TELL
| $987K | ﹤0.01% |
1,421
+38
| +3% | +$294 |
|
1639
Idexx Laboratories
IDXX
$42.9B
| $986K | ﹤0.01% |
5,302
-1,762
| -25% | -$361K |
|
1640
Take-Two Interactive
TTWO
$43B
| $986K | ﹤0.01% |
9,584
-11,273
| -54% | -$1.3M |
|
|
BKI
1641
CALL
DELISTED
Black Knight, Inc. Common Stock
BKI
| $986K | ﹤0.01% |
+219
| New | +$10.3K |
|
1642
CALL
STMicroelectronics
STM
$46B
| $985K | ﹤0.01% |
710
+218
| +44% | +$3.27K |
|
1643
PUT
Dillards
DDS
$8.87B
| $983K | ﹤0.01% |
163
-158
| -49% | -$10.9K |
|
|
APHA
1644
DELISTED
Aphria Inc. Common Shares
APHA
| $981K | ﹤0.01% |
+172,480
| New | +$1.36M |
|
1645
PUT
Texas Capital Bancshares
TCBI
$4.31B
| $980K | ﹤0.01% |
192
+167
| +668% | +$10.5K |
|
1646
CALL
Jazz Pharmaceuticals
JAZZ
$15.9B
| $979K | ﹤0.01% |
79
+30
| +61% | +$4.45K |
|
|
1647
Snap
SNAP
$7.32B
| $979K | ﹤0.01% |
177,825
-244,013
| -58% | -$1.59M |
|
|
BEAT
1648
CALL
DELISTED
BioTelemetry, Inc.
BEAT
| $979K | ﹤0.01% |
164
+31
| +23% | +$1.86K |
|
1649
State Street SPDR S&P Metals & Mining ETF
XME
$4.05B
| $978K | ﹤0.01% |
+37,350
| New | +$1.13M |
|
1650
CALL
Ford
F
$57.3B
| $976K | ﹤0.01% |
1,276
-552
| -30% | -$4.92K |
|
Similar funds
Simplex Trading's Q4 2018 Portfolio in Review
As of Q4 2018, Simplex Trading held 8,576 positions worth $34.1B, up 9.5% from $31.1B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading's Q4 2018 filing shows 1,199 new, 2,701 increased, 2,877 reduced and 1,573 closed positions. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M. The largest sale was Amazon, an estimated $109M.
By sector, the portfolio is most concentrated in Communication Services at 0.49% of assets, down from 0.89% a quarter earlier, followed by Consumer Discretionary and Technology.
- Simplex Trading's largest Q4 2018 buy was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q4 2018, an estimated $58.5M increase.
- Simplex Trading's biggest Q4 2018 reduction was Amazon, cutting an estimated $109M.
- Simplex Trading fully exited Meta Platforms (Facebook) in Q4 2018, selling an estimated $62.3M.
- Simplex Trading's ten largest holdings make up 43% of its $34.1B portfolio in Q4 2018.
- Simplex Trading opened 1,199 new positions and closed 1,573 in Q4 2018.
- Simplex Trading's portfolio value rose 9.5% quarter-over-quarter to $34.1B.
Based on Simplex Trading's 13F filing for Q4 2018, filed 16 Jan 2019.