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 |
Apple
AAPL
|
+$34.5M |
| 2 |
Micron Technology
MU
|
+$33.9M |
| 3 |
Berkshire Hathaway Class B
BRK.B
|
+$30.8M |
| 4 |
NVIDIA
NVDA
|
+$23.5M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$22.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
TWX
Time Warner Inc
TWX
|
+$34.8M |
| 2 |
Amazon
AMZN
|
+$31.2M |
| 3 |
Tesla
TSLA
|
+$17.6M |
| 4 |
Netflix
NFLX
|
+$15.5M |
| 5 |
Advanced Micro Devices
AMD
|
+$12.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 1.23% |
| 2 | Consumer Discretionary | 0.92% |
| 3 | Communication Services | 0.73% |
| 4 | Financials | 0.62% |
| 5 | Industrials | 0.6% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2501
Leidos
LDOS
$14.1B
| $478K | ﹤0.01% |
8,114
-9,352
| -54% | -$583K |
|
2502
Omeros
OMER
$709M
| $477K | ﹤0.01% |
26,323
-18,062
| -41% | -$313K |
|
2503
SM Energy
SM
$7.96B
| $477K | ﹤0.01% |
18,597
-10,925
| -37% | -$255K |
|
|
TTM
2504
DELISTED
Tata Motors Limited
TTM
| $477K | ﹤0.01% |
+24,446
| New | +$578K |
|
2505
PUT
Sony
SONY
$123B
| $476K | ﹤0.01% |
465
+120
| +35% | +$1.17K |
|
|
STAY
2506
DELISTED
Extended Stay America, Inc. Paired Share Unit
STAY
| $476K | ﹤0.01% |
22,058
+11,024
| +100% | +$226K |
|
|
SINA
2507
CALL
DELISTED
Sina Corp
SINA
| $476K | ﹤0.01% |
58
-139
| -71% | -$12.9K |
|
|
DCP
2508
CALL
DELISTED
DCP Midstream, LP
DCP
| $474K | ﹤0.01% |
120
-88
| -42% | -$3.37K |
|
|
ATVI
2509
DELISTED
Activision Blizzard
ATVI
| $474K | ﹤0.01% |
6,214
-22,954
| -79% | -$1.62M |
|
|
TGH
2510
DELISTED
Textainer Group Holdings limited
TGH
| $473K | ﹤0.01% |
29,751
+6,089
| +26% | +$103K |
|
2511
CALL
Aecom
ACM
$9.07B
| $472K | ﹤0.01% |
143
-14
| -9% | -$480 |
|
2512
CALL
Alarm.com
ALRM
$2.56B
| $472K | ﹤0.01% |
117
-93
| -44% | -$3.86K |
|
2513
PUT
Invesco CurrencyShares Canadian Dollar Trust
FXC
$69.2M
| $472K | ﹤0.01% |
+63
| New | +$4.82K |
|
2514
PUT
SiriusXM
SIRI
$10B
| $471K | ﹤0.01% |
70
+42
| +150% | +$2.84K |
|
2515
Biogen
BIIB
$29.9B
| $470K | ﹤0.01% |
+1,620
| New | +$455K |
|
2516
CALL
Jacobs Solutions
J
$15.9B
| $469K | ﹤0.01% |
89
-48
| -35% | -$2.47K |
|
2517
United Rentals
URI
$71.1B
| $468K | ﹤0.01% |
+3,174
| New | +$519K |
|
2518
Extreme Networks
EXTR
$3.86B
| $467K | ﹤0.01% |
58,669
+53,324
| +998% | +$512K |
|
|
CY
2519
CALL
DELISTED
Cypress Semiconductor
CY
| $467K | ﹤0.01% |
300
+1
| +0.3% | +$16 |
|
2520
PUT
MSC Industrial Direct
MSM
$7.02B
| $466K | ﹤0.01% |
55
-7
| -11% | -$634 |
|
|
CLDR
2521
DELISTED
Cloudera, Inc.
CLDR
| $466K | ﹤0.01% |
34,206
-27,971
| -45% | -$427K |
|
|
VAR
2522
PUT
DELISTED
Varian Medical Systems, Inc.
VAR
| $466K | ﹤0.01% |
41
+18
| +78% | +$2.15K |
|
2523
PUT
AerCap
AER
$23.9B
| $465K | ﹤0.01% |
86
-862
| -91% | -$46.4K |
|
2524
Brinker International
EAT
$8.02B
| $465K | ﹤0.01% |
9,776
+4,103
| +72% | +$182K |
|
2525
CALL
JetBlue
JBLU
$1.96B
| $465K | ﹤0.01% |
245
+27
| +12% | +$520 |
|
Similar funds
Simplex Trading's Q2 2018 Portfolio in Review
As of Q2 2018, Simplex Trading held 8,400 positions worth $25.5B, up 1,022% from $2.27B the previous quarter. Its ten largest holdings account for 29% of the portfolio.
Simplex Trading's Q2 2018 filing shows 2,282 new, 2,314 increased, 2,591 reduced and 1,035 closed positions. Its largest new stake was Alphabet (Google) Class C: 291,860 shares worth $16.3M. The largest sale was Time Warner Inc, an estimated $34.8M.
By sector, the portfolio is most concentrated in Technology at 1.2% of assets, down from 6.2% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q2 2018 buy was Alphabet (Google) Class C: 291,860 shares worth $16.3M.
- Simplex Trading added most to Apple in Q2 2018, an estimated $34.5M increase.
- Simplex Trading's biggest Q2 2018 reduction was Amazon, cutting an estimated $31.2M.
- Simplex Trading fully exited Time Warner Inc in Q2 2018, selling an estimated $34.8M.
- Simplex Trading's ten largest holdings make up 29% of its $25.5B portfolio in Q2 2018.
- Simplex Trading opened 2,282 new positions and closed 1,035 in Q2 2018.
- Simplex Trading's portfolio value rose 1,022% quarter-over-quarter to $25.5B.
Based on Simplex Trading's 13F filing for Q2 2018, filed 30 Jul 2018.