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 | |
|---|---|---|---|---|---|---|
|
HOUS
1826
PUT
DELISTED
Anywhere Real Estate
HOUS
| $795K | ﹤0.01% |
542
+525
| +3,088% | +$9.56K |
|
|
ZAYO
1827
DELISTED
Zayo Group Holdings, Inc.
ZAYO
| $795K | ﹤0.01% |
34,846
+23,828
| +216% | +$652K |
|
|
KW
1828
PUT
DELISTED
Kennedy-Wilson Holdings
KW
| $794K | ﹤0.01% |
+437
| New | +$8.38K |
|
1829
CALL
Wolverine World Wide
WWW
$1.54B
| $794K | ﹤0.01% |
249
+216
| +655% | +$7.36K |
|
1830
CALL
Charles River Laboratories
CRL
$10.9B
| $792K | ﹤0.01% |
70
+25
| +56% | +$3.13K |
|
1831
iShares Biotechnology ETF
IBB
$9.31B
| $792K | ﹤0.01% |
+8,221
| New | +$873K |
|
1832
CALL
Nokia
NOK
$50.8B
| $792K | ﹤0.01% |
1,362
+1,314
| +2,738% | +$7.37K |
|
|
XIFR
1833
PUT
XPLR Infrastructure LP
XIFR
$1.18B
| $787K | ﹤0.01% |
183
+154
| +531% | +$7.02K |
|
1834
PUT
Mattel
MAT
$4.17B
| $786K | ﹤0.01% |
787
+250
| +47% | +$3.31K |
|
1835
CALL
Aegon
AEG
$13.5B
| $785K | ﹤0.01% |
1,972
+1,916
| +3,421% | +$9.35K |
|
|
CYBR
1836
PUT
DELISTED
CyberArk
CYBR
| $785K | ﹤0.01% |
106
-149
| -58% | -$10.6K |
|
1837
CALL
Jack in the Box
JACK
$278M
| $784K | ﹤0.01% |
101
-196
| -66% | -$15.9K |
|
1838
Bread Financial
BFH
$4.21B
| $783K | ﹤0.01% |
6,543
+3,408
| +109% | +$534K |
|
1839
CALL
iShares Gold Trust
IAU
$63B
| $782K | ﹤0.01% |
319
+317
| +15,850% | +$7.46K |
|
1840
CALL
National Grid
NGG
$82.7B
| $782K | ﹤0.01% |
184
+113
| +159% | +$5.28K |
|
1841
PUT
Xerox
XRX
$337M
| $782K | ﹤0.01% |
396
-725
| -65% | -$18.6K |
|
|
AXE
1842
CALL
DELISTED
Anixter International Inc
AXE
| $782K | ﹤0.01% |
144
+34
| +31% | +$2.14K |
|
|
BID
1843
PUT
DELISTED
Sotheby's
BID
| $782K | ﹤0.01% |
197
+10
| +5% | +$408 |
|
1844
PUT
Chegg
CHGG
$108M
| $781K | ﹤0.01% |
275
+101
| +58% | +$2.72K |
|
1845
CALL
Gaming and Leisure Properties
GLPI
$12.8B
| $781K | ﹤0.01% |
242
+114
| +89% | +$3.86K |
|
|
VAR
1846
CALL
DELISTED
Varian Medical Systems, Inc.
VAR
| $781K | ﹤0.01% |
69
+29
| +73% | +$3.32K |
|
1847
Johnson Controls International
JCI
$87.5B
| $780K | ﹤0.01% |
26,339
+16,597
| +170% | +$548K |
|
1848
PUT
Grand Canyon Education
LOPE
$3.71B
| $778K | ﹤0.01% |
81
-88
| -52% | -$10.2K |
|
|
SF
1849
PUT
Stifel
SF
$12.3B
| $778K | ﹤0.01% |
423
+387
| +1,075% | +$8.02K |
|
|
BZUN
1850
Baozun
BZUN
$144M
| $776K | ﹤0.01% |
26,568
-31,842
| -55% | -$1.17M |
|
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.