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 | |
|---|---|---|---|---|---|---|
|
AKRX
926
DELISTED
Akorn Inc
AKRX
| $338K | 0.01% |
18,105
+14,531
| +407% | +$394K |
|
|
APC
927
PUT
DELISTED
Anadarko Petroleum
APC
| $338K | 0.01% |
2,196
+963
| +78% | +$56.5K |
|
928
Liberty Latin America Class A
LILA
$1.51B
| $337K | 0.01% |
27,103
+18,841
| +228% | +$261K |
|
929
ProShares UltraPro Russell2000
URTY
$323M
| $337K | 0.01% |
+4,255
| New | +$360K |
|
|
SINA
930
PUT
DELISTED
Sina Corp
SINA
| $337K | 0.01% |
387
-89
| -19% | -$10.2K |
|
931
PVH
PVH
$3.71B
| $336K | 0.01% |
2,223
-13,823
| -86% | -$2.02M |
|
932
CALL
HP
HPQ
$23.5B
| $335K | 0.01% |
1,463
+1,057
| +260% | +$23.9K |
|
933
Allison Transmission
ALSN
$10.1B
| $334K | 0.01% |
8,567
+4,670
| +120% | +$194K |
|
934
Vanguard Materials ETF
VAW
$3B
| $334K | 0.01% |
2,593
+2,189
| +542% | +$300K |
|
|
WWE
935
DELISTED
World Wrestling Entertainment
WWE
| $334K | 0.01% |
+9,293
| New | +$327K |
|
936
CALL
ArcelorMittal
MT
$50.4B
| $333K | 0.01% |
749
+50
| +7% | +$1.71K |
|
|
POLY
937
DELISTED
Plantronics, Inc.
POLY
| $332K | 0.01% |
+5,511
| New | +$307K |
|
938
Nucor
NUE
$56.4B
| $331K | 0.01% |
+5,420
| New | +$359K |
|
|
SAIL
939
DELISTED
SailPoint Technologies Holdings, Inc. Common Stock
SAIL
| $331K | 0.01% |
+16,010
| New | +$293K |
|
|
FNG
940
DELISTED
AdvisorShares New Tech and Media ETF
FNG
| $331K | 0.01% |
15,940
-6,423
| -29% | -$142K |
|
941
Kennametal
KMT
$2.68B
| $330K | 0.01% |
8,221
-5,555
| -40% | -$254K |
|
942
CALL
Thermo Fisher Scientific
TMO
$211B
| $330K | 0.01% |
336
+177
| +111% | +$37.2K |
|
|
SCG
943
DELISTED
Scana
SCG
| $330K | 0.01% |
8,803
-8,738
| -50% | -$350K |
|
|
AZUL
944
DELISTED
Azul
AZUL
| $329K | 0.01% |
+9,478
| New | +$278K |
|
945
ProShares UltraShort NASDAQ Biotechnology
BIS
$2.3M
| $328K | 0.01% |
+1,943
| New | +$312K |
|
946
Evercore
EVR
$13.1B
| $327K | 0.01% |
3,757
+2,308
| +159% | +$217K |
|
947
Kulicke & Soffa
KLIC
$5.3B
| $327K | 0.01% |
13,090
+12,506
| +2,141% | +$301K |
|
|
CBI
948
PUT
DELISTED
Chicago Bridge & Iron Nv
CBI
| $327K | 0.01% |
501
-458
| -48% | -$8.38K |
|
949
BHP
BHP
$213B
| $326K | 0.01% |
+8,228
| New | +$346K |
|
950
Quest Diagnostics
DGX
$25.1B
| $326K | 0.01% |
+3,256
| New | +$333K |
|
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.