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 | |
|---|---|---|---|---|---|---|
551
HCA Healthcare
HCA
$82.5B
| $642K | 0.03% |
+8,078
| New | +$650K |
|
552
Semtech
SMTC
$12.8B
| $642K | 0.03% |
+17,112
| New | +$638K |
|
553
Exelixis
EXEL
$13.8B
| $641K | 0.03% |
26,477
-4,261
| -14% | -$113K |
|
554
CALL
Marathon Petroleum
MPC
$92.2B
| $640K | 0.03% |
2,605
+1,200
| +85% | +$64.4K |
|
555
PUT
Molson Coors Class B
TAP
$7.7B
| $639K | 0.03% |
480
+5
| +1% | +$440 |
|
556
CALL
Southwest Airlines
LUV
$23.3B
| $635K | 0.03% |
3,184
+1,725
| +118% | +$96.8K |
|
557
NOV
NOV
$7.3B
| $631K | 0.03% |
17,684
-6,790
| -28% | -$222K |
|
558
PUT
Incyte
INCY
$23.1B
| $630K | 0.03% |
556
-9
| -2% | -$1.14K |
|
559
CALL
TransDigm Group
TDG
$66.8B
| $630K | 0.03% |
150
-126
| -46% | -$34.1K |
|
|
AET
560
CALL
DELISTED
Aetna Inc
AET
| $628K | 0.03% |
604
-50
| -8% | -$7.81K |
|
561
PUT
Adobe
ADBE
$86.8B
| $626K | 0.03% |
2,360
+272
| +13% | +$40.6K |
|
|
LVNTA
562
CALL
DELISTED
Liberty Interactive Corporation Series A Liberty Ventures
LVNTA
| $623K | 0.03% |
1,260
+164
| +15% | +$9.49K |
|
563
Rio Tinto
RIO
$150B
| $620K | 0.03% |
+13,150
| New | +$611K |
|
|
SGI
564
CALL
Somnigroup International
SGI
$14.8B
| $619K | 0.03% |
1,732
+1,056
| +156% | +$15.6K |
|
565
Dave & Buster's
PLAY
$355M
| $618K | 0.03% |
11,791
+10,886
| +1,203% | +$647K |
|
|
TWTR
566
PUT
DELISTED
Twitter, Inc.
TWTR
| $617K | 0.03% |
5,984
+3,299
| +123% | +$57.6K |
|
567
PUT
Direxion Daily Technology Bull 3x ETF
TECL
$5.56B
| $615K | 0.03% |
61,620
-12,630
| -17% | -$105K |
|
568
CALL
Mercado Libre
MELI
$91.2B
| $612K | 0.03% |
423
+155
| +58% | +$41.1K |
|
569
PUT
Altria Group
MO
$121B
| $612K | 0.03% |
3,018
-359
| -11% | -$23.9K |
|
|
FIT
570
DELISTED
Fitbit, Inc. Class A common stock
FIT
| $611K | 0.02% |
87,793
-134,644
| -61% | -$784K |
|
|
TCF
571
DELISTED
TCF Financial Corporation
TCF
| $610K | 0.02% |
35,855
-22,453
| -39% | -$354K |
|
|
FOLD
572
DELISTED
Amicus Therapeutics
FOLD
| $608K | 0.02% |
40,336
-11,242
| -22% | -$149K |
|
|
ETFC
573
DELISTED
E*Trade Financial Corporation
ETFC
| $607K | 0.02% |
+13,937
| New | +$566K |
|
574
CALL
Adient
ADNT
$1.62B
| $605K | 0.02% |
574
+325
| +131% | +$23K |
|
575
Mercury Systems
MRCY
$5.94B
| $603K | 0.02% |
11,636
-640
| -5% | -$29.5K |
|
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.