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 | |
|---|---|---|---|---|---|---|
2601
CALL
PRA Group
PRAA
$648M
| $435K | ﹤0.01% |
113
+38
| +51% | +$1.47K |
|
2602
PUT
Vicor
VICR
$9.62B
| $435K | ﹤0.01% |
100
+46
| +85% | +$1.78K |
|
|
ZEN
2603
CALL
DELISTED
ZENDESK INC
ZEN
| $435K | ﹤0.01% |
80
+76
| +1,900% | +$4.04K |
|
2604
PUT
La-Z-Boy
LZB
$1.59B
| $434K | ﹤0.01% |
142
-185
| -57% | -$5.68K |
|
|
CRCM
2605
DELISTED
CARE.COM, INC.
CRCM
| $434K | ﹤0.01% |
20,816
+13,847
| +199% | +$259K |
|
|
BMS
2606
PUT
DELISTED
Bemis
BMS
| $434K | ﹤0.01% |
103
+40
| +63% | +$1.73K |
|
|
IMPV
2607
CALL
DELISTED
Imperva, Inc.
IMPV
| $434K | ﹤0.01% |
90
+81
| +900% | +$3.88K |
|
|
AAN.A
2608
CALL
DELISTED
The Aaron's Company Inc Class A
AAN.A
| $434K | ﹤0.01% |
100
+64
| +178% | +$278K |
|
|
NVO
2609
CALL
Novo Nordisk
NVO
$216B
| $433K | ﹤0.01% |
188
+24
| +15% | +$570 |
|
|
PPL
2610
PPL Corp
PPL
$27.3B
| $433K | ﹤0.01% |
+15,167
| New | +$420K |
|
2611
CALL
Veracyte
VCYT
$4.52B
| $433K | ﹤0.01% |
+464
| New | +$3.26K |
|
2612
CALL
CRA International
CRAI
$1.1B
| $432K | ﹤0.01% |
+85
| New | +$4.67K |
|
2613
CALL
Spectrum Brands
SPB
$2.04B
| $432K | ﹤0.01% |
53
-99
| -65% | -$8.32K |
|
2614
CALL
HP
HPQ
$23.5B
| $431K | ﹤0.01% |
190
-1,273
| -87% | -$28.4K |
|
2615
CALL
Jones Lang LaSalle
JLL
$15.1B
| $431K | ﹤0.01% |
26
+25
| +2,500% | +$4.25K |
|
2616
PUT
Franco-Nevada
FNV
$41.4B
| $430K | ﹤0.01% |
59
+20
| +51% | +$1.42K |
|
2617
PUT
AllianceBernstein
AB
$3.47B
| $428K | ﹤0.01% |
150
+58
| +63% | +$1.6K |
|
2618
PUT
Caesarstone
CSTE
$72.3M
| $428K | ﹤0.01% |
284
+19
| +7% | +$326 |
|
2619
PUT
Insperity
NSP
$1.85B
| $428K | ﹤0.01% |
+45
| New | +$3.87K |
|
2620
PUT
Nelnet
NNI
$4.79B
| $426K | ﹤0.01% |
73
-75
| -51% | -$4.33K |
|
2621
Vale
VALE
$62.9B
| $426K | ﹤0.01% |
+33,293
| New | +$455K |
|
2622
PUT
Lithia Motors
LAD
$7.78B
| $425K | ﹤0.01% |
45
+9
| +25% | +$891 |
|
|
STAY
2623
CALL
DELISTED
Extended Stay America, Inc. Paired Share Unit
STAY
| $425K | ﹤0.01% |
197
+87
| +79% | +$1.78K |
|
|
SONC
2624
DELISTED
Sonic Corp
SONC
| $425K | ﹤0.01% |
+12,354
| New | +$344K |
|
2625
CALL
Chord Energy
CHRD
$7.79B
| $424K | ﹤0.01% |
327
+235
| +255% | +$2.68K |
|
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.