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 | |
|---|---|---|---|---|---|---|
626
PUT
Cboe Global Markets
CBOE
$29.5B
| $4.35M | 0.02% |
418
+43
| +11% | +$4.54K |
|
627
PUT
Southwest Airlines
LUV
$23.3B
| $4.34M | 0.02% |
853
+195
| +30% | +$10.3K |
|
628
CALL
General Mills
GIS
$19.7B
| $4.34M | 0.02% |
980
+446
| +84% | +$19.5K |
|
629
CALL
Cracker Barrel
CBRL
$1.19B
| $4.33M | 0.02% |
277
-3
| -1% | -$484 |
|
630
CALL
United Rentals
URI
$64.8B
| $4.33M | 0.02% |
293
+73
| +33% | +$11.9K |
|
|
VIAB
631
PUT
DELISTED
Viacom Inc. Class B
VIAB
| $4.32M | 0.02% |
1,433
+330
| +30% | +$9.71K |
|
632
Western Digital
WDC
$192B
| $4.32M | 0.02% |
+73,846
| New | +$4.7M |
|
633
PUT
MSCI
MSCI
$41.5B
| $4.32M | 0.02% |
+261
| New | +$41.2K |
|
|
LSI
634
PUT
DELISTED
Life Storage, Inc.
LSI
| $4.31M | 0.02% |
665
-543
| -45% | -$32.8K |
|
635
Edwards Lifesciences
EW
$48.6B
| $4.31M | 0.02% |
+88,812
| New | +$4.15M |
|
|
PF
636
CALL
DELISTED
Pinnacle Foods, Inc.
PF
| $4.29M | 0.02% |
660
-45,013
| -99% | -$2.77M |
|
637
PUT
Bath & Body Works
BBWI
$4.04B
| $4.29M | 0.02% |
1,439
-600
| -29% | -$17.3K |
|
638
CALL
Oneok
OKE
$57.8B
| $4.29M | 0.02% |
614
-566
| -48% | -$36.4K |
|
639
CALL
Paychex
PAYX
$39.4B
| $4.29M | 0.02% |
627
+174
| +38% | +$11.2K |
|
640
CALL
Xerox
XRX
$348M
| $4.29M | 0.02% |
1,786
+1,275
| +250% | +$36K |
|
641
CALL
Dominion Energy
D
$62.5B
| $4.27M | 0.02% |
626
+407
| +186% | +$26.5K |
|
642
PUT
Acuity Brands
AYI
$9.93B
| $4.26M | 0.02% |
368
+176
| +92% | +$21.4K |
|
643
CALL
Danaher
DHR
$126B
| $4.26M | 0.02% |
487
+219
| +82% | +$19.5K |
|
644
CALL
Enbridge
ENB
$123B
| $4.25M | 0.02% |
+1,191
| New | +$37.7K |
|
645
Workday
WDAY
$32.7B
| $4.23M | 0.02% |
34,909
+34,296
| +5,595% | +$4.39M |
|
646
American International
AIG
$41.5B
| $4.22M | 0.02% |
79,658
-108,351
| -58% | -$5.86M |
|
647
PUT
Cardinal Health
CAH
$51.7B
| $4.22M | 0.02% |
864
+73
| +9% | +$4.14K |
|
648
PUT
CF Industries
CF
$19.6B
| $4.2M | 0.02% |
946
+94
| +11% | +$3.83K |
|
649
PUT
General Dynamics
GD
$101B
| $4.19M | 0.02% |
225
-382
| -63% | -$78.2K |
|
|
CS
650
PUT
DELISTED
Credit Suisse Group
CS
| $4.19M | 0.02% |
2,815
+2,074
| +280% | +$33.4K |
|
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.