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 | |
|---|---|---|---|---|---|---|
576
PUT
Chevron
CVX
$387B
| $656K | 0.03% |
1,910
-2,916
| -60% | -$349K |
|
577
Knight Transportation
KNX
$11.8B
| $656K | 0.03% |
+14,277
| New | +$676K |
|
578
Timken Company
TKR
$9.79B
| $655K | 0.03% |
+14,366
| New | +$691K |
|
|
BZUN
579
CALL
Baozun
BZUN
$143M
| $654K | 0.03% |
754
+618
| +454% | +$24.3K |
|
|
MULE
580
CALL
DELISTED
MuleSoft, Inc.
MULE
| $651K | 0.03% |
1,132
+1,075
| +1,886% | +$32K |
|
|
LFIN
581
PUT
DELISTED
LongFin Corp Class A Common Stock
LFIN
| $649K | 0.03% |
+380
| New | +$16K |
|
582
Henry Schein
HSIC
$9.63B
| $648K | 0.03% |
+12,301
| New | +$681K |
|
583
Okta
OKTA
$23.7B
| $647K | 0.03% |
16,255
+15,317
| +1,633% | +$511K |
|
584
CALL
TJX Companies
TJX
$170B
| $646K | 0.03% |
1,966
-1,392
| -41% | -$55K |
|
585
Kinder Morgan
KMI
$72.9B
| $645K | 0.03% |
+42,886
| New | +$743K |
|
|
LADR
586
Ladder Capital
LADR
$1.22B
| $645K | 0.03% |
+42,786
| New | +$626K |
|
587
PUT
General Mills
GIS
$19B
| $644K | 0.03% |
1,476
-68
| -4% | -$3.69K |
|
588
CALL
Las Vegas Sands
LVS
$30.5B
| $644K | 0.03% |
1,741
+69
| +4% | +$5.06K |
|
589
AXIS Capital
AXS
$8.45B
| $643K | 0.03% |
11,184
+4,600
| +70% | +$237K |
|
590
Brunswick
BC
$5.17B
| $642K | 0.03% |
10,820
+6,242
| +136% | +$369K |
|
591
CALL
Amgen
AMGN
$201B
| $641K | 0.03% |
1,792
+83
| +5% | +$15.2K |
|
|
ATVI
592
CALL
DELISTED
Activision Blizzard
ATVI
| $637K | 0.03% |
2,370
-178
| -7% | -$12.6K |
|
593
Medtronic
MDT
$105B
| $636K | 0.03% |
7,935
-20,194
| -72% | -$1.67M |
|
594
Progress Software
PRGS
$1.51B
| $636K | 0.03% |
+16,551
| New | +$759K |
|
595
PUT
Verizon
VZ
$183B
| $636K | 0.03% |
2,709
-443
| -14% | -$22.3K |
|
596
iShares Russell 2000 Growth ETF
IWO
$14.6B
| $635K | 0.03% |
3,336
+2,132
| +177% | +$409K |
|
|
SPLK
597
CALL
DELISTED
Splunk Inc
SPLK
| $635K | 0.03% |
413
+27
| +7% | +$2.58K |
|
|
ETP
598
DELISTED
Energy Transfer Partners, L.P.
ETP
| $635K | 0.03% |
39,164
-59,257
| -60% | -$1.1M |
|
599
CALL
Texas Instruments
TXN
$260B
| $634K | 0.03% |
2,125
+712
| +50% | +$77.1K |
|
600
Wingstop
WING
$3.67B
| $634K | 0.03% |
+13,441
| New | +$617K |
|
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.