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 | |
|---|---|---|---|---|---|---|
501
Galicia Financial Group
GGAL
$8.06B
| $770K | 0.03% |
11,715
-684
| -6% | -$44.9K |
|
502
CALL
GoDaddy
GDDY
$11.6B
| $769K | 0.03% |
12,283
+12,252
| +39,523% | +$693K |
|
|
SVU
503
DELISTED
SUPERVALU Inc.
SVU
| $767K | 0.03% |
+50,362
| New | +$801K |
|
504
PUT
Albemarle
ALB
$13.8B
| $766K | 0.03% |
846
+72
| +9% | +$7.93K |
|
505
PUT
Texas Instruments
TXN
$260B
| $765K | 0.03% |
1,838
-750
| -29% | -$81.2K |
|
506
CALL
AB InBev
BUD
$155B
| $764K | 0.03% |
1,539
+239
| +18% | +$26.5K |
|
507
CALL
American Airlines Group
AAL
$8.97B
| $763K | 0.03% |
2,689
-1,781
| -40% | -$95.4K |
|
508
Assurant
AIZ
$13.6B
| $762K | 0.03% |
8,344
+7,626
| +1,062% | +$697K |
|
509
Schwab US Large- Cap ETF
SCHX
$70.8B
| $762K | 0.03% |
72,486
+14,886
| +26% | +$162K |
|
|
ZAYO
510
CALL
DELISTED
Zayo Group Holdings, Inc.
ZAYO
| $762K | 0.03% |
20,673
+20,412
| +7,821% | +$735K |
|
511
PUT
Direxion Daily Technology Bull 3x ETF
TECL
$5.39B
| $760K | 0.03% |
14,060
-52,960
| -79% | -$675K |
|
512
State Street Utilities Select Sector SPDR ETF
XLU
$24B
| $760K | 0.03% |
30,090
-67,656
| -69% | -$1.69M |
|
513
Regency Centers
REG
$14.9B
| $759K | 0.03% |
+12,884
| New | +$778K |
|
514
AerCap
AER
$23.4B
| $757K | 0.03% |
14,936
+6,879
| +85% | +$357K |
|
515
CALL
Ball Corp
BALL
$16.6B
| $757K | 0.03% |
19,094
+18,789
| +6,160% | +$735K |
|
|
KEM
516
DELISTED
KEMET Corporation
KEM
| $757K | 0.03% |
+41,808
| New | +$765K |
|
517
Ionis Pharmaceuticals
IONS
$9.23B
| $753K | 0.03% |
17,087
-3,643
| -18% | -$185K |
|
518
Olin
OLN
$2.69B
| $745K | 0.03% |
24,538
+6,646
| +37% | +$226K |
|
|
WPZ
519
DELISTED
Williams Partners L.P.
WPZ
| $743K | 0.03% |
+21,607
| New | +$844K |
|
520
Clearwater Paper
CLW
$264M
| $742K | 0.03% |
18,986
+18,955
| +61,145% | +$788K |
|
521
ProShares UltraPro S&P 500
UPRO
$5.09B
| $739K | 0.03% |
33,960
-221,688
| -87% | -$5.45M |
|
522
CALL
Everest Group
EG
$14.9B
| $733K | 0.03% |
2,831
+2,829
| +141,450% | +$679K |
|
523
Motorola Solutions
MSI
$67.6B
| $732K | 0.03% |
+6,956
| New | +$711K |
|
524
CALL
ProShares UltraShort Industrials
SIJ
$5.78M
| $729K | 0.03% |
281
-17
| -6% | -$4.37K |
|
|
ATVI
525
PUT
DELISTED
Activision Blizzard
ATVI
| $729K | 0.03% |
2,612
+261
| +11% | +$18.4K |
|
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.