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 |
Amazon
AMZN
|
+$45.9M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$30.1M |
| 3 |
TWX
Time Warner Inc
TWX
|
+$25.8M |
| 4 |
Booking.com
BKNG
|
+$22.5M |
| 5 |
Alphabet (Google) Class C
GOOG
|
+$17.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$43.6M |
| 2 |
Amgen
AMGN
|
+$33.2M |
| 3 |
Baidu
BIDU
|
+$19.3M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$17.3M |
| 5 |
Micron Technology
MU
|
+$17.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 14.31% |
| 2 | Technology | 13.17% |
| 3 | Communication Services | 11.81% |
| 4 | Healthcare | 4.06% |
| 5 | Financials | 3.84% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
576
PUT
ProShares UltraShort Health Care
RXD
$3.38M
| $603K | 0.02% |
363
-41
| -10% | -$5.38K |
|
577
Capital One
COF
$124B
| $601K | 0.02% |
7,106
-22,981
| -76% | -$1.89M |
|
|
HIMX
578
Himax Technologies
HIMX
$2.38B
| $601K | 0.02% |
+55,040
| New | +$500K |
|
579
CALL
CSX Corp
CSX
$92.8B
| $600K | 0.02% |
4,983
-2,244
| -31% | -$38.5K |
|
580
Valero Energy
VLO
$92.3B
| $600K | 0.02% |
7,812
+3,765
| +93% | +$259K |
|
581
iShare MSCI Eurozone ETF
EZU
$9.53B
| $599K | 0.02% |
+13,842
| New | +$580K |
|
|
STRP
582
CALL
DELISTED
Straight Path Communications Inc.
STRP
| $599K | 0.02% |
797
-760
| -49% | -$136K |
|
583
The Greenbrier Companies
GBX
$1.58B
| $597K | 0.02% |
+12,399
| New | +$550K |
|
|
LVLT
584
DELISTED
Level 3 Communications Inc
LVLT
| $596K | 0.02% |
+11,196
| New | +$624K |
|
585
CALL
Ollie's Bargain Outlet
OLLI
$4.02B
| $591K | 0.02% |
416
-171
| -29% | -$7.55K |
|
586
CALL
Illumina
ILMN
$28.9B
| $588K | 0.02% |
288
+116
| +67% | +$21.6K |
|
587
Under Armour Class C
UA
$3.02B
| $588K | 0.02% |
39,195
+43
| +0.1% | +$724 |
|
588
Enterprise Products Partners
EPD
$84.1B
| $583K | 0.02% |
+22,366
| New | +$591K |
|
589
Range Resources
RRC
$9.13B
| $583K | 0.02% |
29,809
-69,852
| -70% | -$1.35M |
|
|
ITCI
590
DELISTED
Intra-Cellular Therapies Inc.
ITCI
| $581K | 0.02% |
36,852
+5,638
| +18% | +$82.7K |
|
591
Omeros
OMER
$712M
| $580K | 0.02% |
26,837
+25,079
| +1,427% | +$531K |
|
592
Ferrari
RACE
$65.4B
| $580K | 0.02% |
5,258
-12,147
| -70% | -$1.29M |
|
593
Expeditors International
EXPD
$23.2B
| $577K | 0.02% |
+9,653
| New | +$553K |
|
594
CALL
Shopify
SHOP
$154B
| $577K | 0.02% |
4,880
-3,680
| -43% | -$37.6K |
|
|
595
PUT
Capital One
COF
$124B
| $576K | 0.02% |
2,438
-308
| -11% | -$25.4K |
|
596
Public Storage
PSA
$54.7B
| $576K | 0.02% |
+2,692
| New | +$556K |
|
597
WIX.com
WIX
$2.04B
| $576K | 0.02% |
8,019
+405
| +5% | +$26.9K |
|
|
MLNX
598
DELISTED
Mellanox Technologies, Ltd.
MLNX
| $576K | 0.02% |
+12,233
| New | +$555K |
|
599
JB Hunt Transport Services
JBHT
$27.4B
| $574K | 0.02% |
5,169
+1,005
| +24% | +$97.3K |
|
600
Direxion Daily S&P 500 Bull 3x ETF
SPXL
$6.82B
| $570K | 0.02% |
+14,932
| New | +$538K |
|
Similar funds
Simplex Trading's Q3 2017 Portfolio in Review
As of Q3 2017, Simplex Trading held 7,357 positions worth $2.45B, up 6.4% from $2.3B the previous quarter. Its ten largest holdings account for 24% of the portfolio.
Simplex Trading's Q3 2017 filing shows 1,313 new, 2,078 increased, 2,339 reduced and 1,500 closed positions. Its largest new stake was iShares Russell 2000 ETF: 214,170 shares worth $31.7M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $43.6M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 14% of assets, up from 9.7% a quarter earlier, followed by Technology and Communication Services.
- Simplex Trading's largest Q3 2017 buy was iShares Russell 2000 ETF: 214,170 shares worth $31.7M.
- Simplex Trading added most to Amazon in Q3 2017, an estimated $45.9M increase.
- Simplex Trading's biggest Q3 2017 reduction was Baidu, cutting an estimated $19.3M.
- Simplex Trading fully exited State Street SPDR S&P 500 ETF Trust in Q3 2017, selling an estimated $43.6M.
- Simplex Trading's ten largest holdings make up 24% of its $2.45B portfolio in Q3 2017.
- Simplex Trading opened 1,313 new positions and closed 1,500 in Q3 2017.
- Simplex Trading's portfolio value rose 6.4% quarter-over-quarter to $2.45B.
Based on Simplex Trading's 13F filing for Q3 2017, filed 25 Oct 2017.