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 | |
|---|---|---|---|---|---|---|
1326
International Paper
IP
$22.3B
| $176K | 0.01% |
+3,488
| New | +$194K |
|
1327
Mativ Holdings
MATV
$448M
| $176K | 0.01% |
+4,518
| New | +$191K |
|
1328
Black Hills Corp
BKH
$5.73B
| $175K | 0.01% |
3,228
+281
| +10% | +$15K |
|
1329
PUT
HP
HPQ
$23.5B
| $175K | 0.01% |
2,088
+1,918
| +1,128% | +$43.3K |
|
|
BMS
1330
DELISTED
Bemis
BMS
| $175K | 0.01% |
4,033
-22,274
| -85% | -$1.02M |
|
1331
PUT
Accenture
ACN
$89.9B
| $174K | 0.01% |
246
-451
| -65% | -$71.4K |
|
1332
PUT
American Tower
AMT
$77.7B
| $174K | 0.01% |
1,078
+486
| +82% | +$68.5K |
|
1333
CALL
McKesson
MCK
$98.5B
| $174K | 0.01% |
673
+242
| +56% | +$37.7K |
|
1334
VirnetX Holding Corp
VHC
$52.3M
| $174K | 0.01% |
2,210
+478
| +28% | +$36.2K |
|
|
NS
1335
DELISTED
NuStar Energy L.P.
NS
| $174K | 0.01% |
8,567
-9,755
| -53% | -$261K |
|
|
IMGN
1336
PUT
DELISTED
Immunogen Inc
IMGN
| $174K | 0.01% |
729
+446
| +158% | +$4.41K |
|
|
HZNP
1337
DELISTED
Horizon Therapeutics Public Limited Company Ordinary Shares
HZNP
| $174K | 0.01% |
+12,300
| New | +$182K |
|
1338
Arrow Electronics
ARW
$10.9B
| $173K | 0.01% |
2,250
+780
| +53% | +$63.3K |
|
1339
PUT
ConocoPhillips
COP
$147B
| $173K | 0.01% |
1,125
-2,351
| -68% | -$133K |
|
1340
CALL
CoStar Group
CSGP
$11.3B
| $173K | 0.01% |
140
| – | – |
|
1341
PUT
Domino's
DPZ
$11B
| $173K | 0.01% |
155
-106
| -41% | -$23.1K |
|
1342
Equinix
EQIX
$107B
| $173K | 0.01% |
+415
| New | +$175K |
|
1343
Loews
L
$24.3B
| $173K | 0.01% |
+3,482
| New | +$176K |
|
1344
Anika Therapeutics
ANIK
$199M
| $172K | 0.01% |
+3,468
| New | +$196K |
|
1345
Oceaneering
OII
$5.25B
| $172K | 0.01% |
9,325
+8,417
| +927% | +$169K |
|
|
LMRK
1346
DELISTED
Landmark Infrastructure Partners LP Common Units
LMRK
| $172K | 0.01% |
+10,375
| New | +$181K |
|
1347
CALL
CVS Health
CVS
$137B
| $171K | 0.01% |
1,639
-710
| -30% | -$50.9K |
|
1348
Gildan
GIL
$9.25B
| $171K | 0.01% |
+5,935
| New | +$184K |
|
|
LOMA
1349
PUT
Loma Negra
LOMA
$1.33B
| $171K | 0.01% |
+431
| New | +$9.79K |
|
|
GAP
1350
PUT
The Gap Inc
GAP
$6.84B
| $171K | 0.01% |
1,202
+293
| +32% | +$9.59K |
|
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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.