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 | |
|---|---|---|---|---|---|---|
|
PRTK
2476
CALL
DELISTED
Paratek Pharmaceuticals, Inc.
PRTK
| $492K | ﹤0.01% |
483
+240
| +99% | +$2.72K |
|
|
JKS
2477
PUT
JinkoSolar
JKS
$775M
| $491K | ﹤0.01% |
357
+175
| +96% | +$2.97K |
|
|
MSB
2478
PUT
Mesabi Trust
MSB
$295M
| $491K | ﹤0.01% |
200
+151
| +308% | +$3.71K |
|
|
RDFN
2479
CALL
DELISTED
Redfin
RDFN
| $491K | ﹤0.01% |
213
+189
| +788% | +$4.26K |
|
2480
PUT
Stanley Black & Decker
SWK
$14.2B
| $491K | ﹤0.01% |
37
+1
| +3% | +$144 |
|
2481
PUT
Ball Corp
BALL
$17B
| $490K | ﹤0.01% |
+138
| New | +$5.29K |
|
2482
Trane Technologies
TT
$106B
| $490K | ﹤0.01% |
+5,462
| New | +$480K |
|
2483
CALL
Cerus
CERS
$587M
| $489K | ﹤0.01% |
734
-140
| -16% | -$859 |
|
2484
CALL
Brighthouse Financial
BHF
$3.63B
| $488K | ﹤0.01% |
122
+101
| +481% | +$4.86K |
|
|
PVG
2485
DELISTED
PRETIUM RESOURCES INC.
PVG
| $488K | ﹤0.01% |
66,616
+38,969
| +141% | +$278K |
|
2486
CALL
KB Home
KBH
$3.48B
| $487K | ﹤0.01% |
179
+13
| +8% | +$350 |
|
2487
AstraZeneca
AZN
$263B
| $486K | ﹤0.01% |
6,933
-34,199
| -83% | -$2.46M |
|
2488
CALL
ICICI Bank
IBN
$106B
| $486K | ﹤0.01% |
606
+358
| +144% | +$3.07K |
|
2489
Clean Harbors
CLH
$16.1B
| $485K | ﹤0.01% |
+8,740
| New | +$449K |
|
|
ECHO
2490
PUT
DELISTED
Echo Global Logistics, Inc.
ECHO
| $485K | ﹤0.01% |
166
-88
| -35% | -$2.52K |
|
2491
Akebia Therapeutics
AKBA
$327M
| $484K | ﹤0.01% |
48,518
+46,743
| +2,633% | +$468K |
|
2492
Gerdau
GGB
$9.44B
| $484K | ﹤0.01% |
172,587
+100,357
| +139% | +$350K |
|
2493
WisdomTree India Earnings Fund ETF
EPI
$2.02B
| $482K | ﹤0.01% |
19,183
+16,581
| +637% | +$431K |
|
2494
Invesco CurrencyShares British Pound Sterling Trust
FXB
$76.9M
| $482K | ﹤0.01% |
+3,770
| New | +$498K |
|
2495
Wheaton Precious Metals
WPM
$50.6B
| $482K | ﹤0.01% |
21,853
+3,740
| +21% | +$80.5K |
|
2496
Cirrus Logic
CRUS
$6.74B
| $480K | ﹤0.01% |
+12,533
| New | +$479K |
|
|
ASXC
2497
CALL
DELISTED
Asensus Surgical, Inc.
ASXC
| $480K | ﹤0.01% |
85
+31
| +57% | +$1.13K |
|
2498
CALL
Core Laboratories
CLB
$538M
| $479K | ﹤0.01% |
38
+14
| +58% | +$1.7K |
|
2499
MakeMyTrip
MMYT
$4.67B
| $479K | ﹤0.01% |
13,269
+7,074
| +114% | +$254K |
|
2500
Graphic Packaging
GPK
$3.26B
| $478K | ﹤0.01% |
+32,970
| New | +$489K |
|
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.