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 |
Tesla
TSLA
|
+$33.5M |
| 2 |
Netflix
NFLX
|
+$22.8M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$20.9M |
| 4 |
TWX
Time Warner Inc
TWX
|
+$18.3M |
| 5 |
Alibaba
BABA
|
+$15.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$71.1M |
| 2 |
Micron Technology
MU
|
+$43.8M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$26.3M |
| 4 |
Booking.com
BKNG
|
+$22.2M |
| 5 |
Boeing
BA
|
+$21.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 7.87% |
| 2 | Communication Services | 7.14% |
| 3 | Technology | 6.23% |
| 4 | Financials | 5.5% |
| 5 | Healthcare | 5.2% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
451
PUT
McDonald's
MCD
$187B
| $857K | 0.04% |
2,618
-180
| -6% | -$29.6K |
|
452
Planet Fitness
PLNT
$4.29B
| $844K | 0.04% |
+22,348
| New | +$783K |
|
453
uniQure
QURE
$2.71B
| $844K | 0.04% |
35,933
+15,612
| +77% | +$340K |
|
454
Invesco S&P 500 Low Volatility ETF
SPLV
$7.12B
| $844K | 0.04% |
17,977
+17,213
| +2,253% | +$814K |
|
455
Spectrum Brands
SPB
$2.01B
| $842K | 0.04% |
8,125
-5,014
| -38% | -$539K |
|
456
PUT
Union Pacific
UNP
$181B
| $841K | 0.04% |
3,011
+1,566
| +108% | +$211K |
|
457
iShares Core MSCI Emerging Markets ETF
IEMG
$152B
| $839K | 0.04% |
14,367
+11,295
| +368% | +$668K |
|
458
Darden Restaurants
DRI
$22.2B
| $838K | 0.04% |
+9,830
| New | +$931K |
|
|
SHNY
459
PUT
DELISTED
Direxion Daily Silver Miners Index Bull 2X Shares
SHNY
| $837K | 0.04% |
2,186
-2,931
| -57% | -$25.3K |
|
460
Enterprise Products Partners
EPD
$83.9B
| $836K | 0.04% |
+34,162
| New | +$910K |
|
461
PUT
Comcast
CMCSA
$78.3B
| $835K | 0.04% |
3,109
-2,335
| -43% | -$90.6K |
|
462
iShares Semiconductor ETF
SOXX
$46.2B
| $835K | 0.04% |
+13,929
| New | +$849K |
|
463
CALL
Arista Networks
ANET
$222B
| $834K | 0.04% |
32,784
+30,800
| +1,552% | +$519K |
|
464
Howmet Aerospace
HWM
$115B
| $834K | 0.04% |
+47,254
| New | +$961K |
|
465
PUT
RTX Corp
RTX
$282B
| $832K | 0.04% |
5,312
+1,672
| +46% | +$138K |
|
466
AB InBev
BUD
$155B
| $825K | 0.04% |
7,513
+4,173
| +125% | +$463K |
|
467
PUT
Mercado Libre
MELI
$91.2B
| $824K | 0.04% |
247
+99
| +67% | +$36.2K |
|
468
ON Semiconductor
ON
$35.1B
| $824K | 0.04% |
+33,727
| New | +$813K |
|
|
SHNY
469
CALL
DELISTED
Direxion Daily Silver Miners Index Bull 2X Shares
SHNY
| $823K | 0.04% |
5,063
-1,017
| -17% | -$8.78K |
|
470
Old Dominion Freight Line
ODFL
$48B
| $822K | 0.04% |
16,794
+5,616
| +50% | +$266K |
|
471
PUT
FedEx
FDX
$74.7B
| $821K | 0.04% |
2,816
+1,036
| +58% | +$262K |
|
472
PUT
Align Technology
ALGN
$12B
| $816K | 0.04% |
954
+278
| +41% | +$71.4K |
|
473
Herbalife
HLF
$1.22B
| $815K | 0.04% |
+16,742
| New | +$711K |
|
474
CALL
Cognex
CGNX
$10.6B
| $812K | 0.04% |
15,699
+15,566
| +11,704% | +$920K |
|
|
CZR
475
CALL
DELISTED
Caesars Entertainment Corporation
CZR
| $811K | 0.04% |
71,942
+70,958
| +7,211% | +$911K |
|
Similar funds
Simplex Trading's Q1 2018 Portfolio in Review
As of Q1 2018, Simplex Trading held 7,591 positions worth $2.27B, down 2.1% from $2.32B the previous quarter. Its ten largest holdings account for 18% of the portfolio.
Simplex Trading withdrew a net $210M in Q1 2018, closing 1,502 positions and reducing 2,267 holdings. Its most notable exit was Alphabet (Google) Class C, an estimated $26.3M position sold in full.
By sector, the portfolio is most concentrated in Consumer Discretionary at 7.9% of assets, down from 11% a quarter earlier, followed by Communication Services and Technology.
Against the trend, Simplex Trading opened a new position in Tesla worth $27.1M.
- Simplex Trading's largest Q1 2018 buy was Tesla: 1,525,035 shares worth $27.1M.
- Simplex Trading added most to Netflix in Q1 2018, an estimated $22.8M increase.
- Simplex Trading's biggest Q1 2018 reduction was Amazon, cutting an estimated $71.1M.
- Simplex Trading fully exited Alphabet (Google) Class C in Q1 2018, selling an estimated $26.3M.
- Simplex Trading's ten largest holdings make up 18% of its $2.27B portfolio in Q1 2018.
- Simplex Trading opened 1,643 new positions and closed 1,502 in Q1 2018.
- Simplex Trading's portfolio value fell 2.1% quarter-over-quarter to $2.27B.
Based on Simplex Trading's 13F filing for Q1 2018, filed 26 Apr 2018.