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 | |
|---|---|---|---|---|---|---|
|
STML
1676
DELISTED
Stemline Therapeutics, Inc.
STML
| $104K | ﹤0.01% |
9,436
+5,878
| +165% | +$55.3K |
|
1677
PUT
Brinker International
EAT
$8.02B
| $103K | ﹤0.01% |
553
-412
| -43% | -$14K |
|
1678
CALL
Lincoln National
LNC
$7.91B
| $103K | ﹤0.01% |
466
+249
| +115% | +$17.6K |
|
1679
CALL
Nice
NICE
$5.29B
| $103K | ﹤0.01% |
45
+24
| +114% | +$1.86K |
|
|
UCTT
1680
Ultra Clean Holdings
UCTT
$4.16B
| $103K | ﹤0.01% |
3,393
+3,093
| +1,031% | +$73.1K |
|
|
LEAF
1681
DELISTED
Leaf Group Ltd.
LEAF
| $103K | ﹤0.01% |
14,949
-2,255
| -13% | -$16.1K |
|
|
QHC
1682
DELISTED
Quorum Health Corporation
QHC
| $103K | ﹤0.01% |
19,909
+16,422
| +471% | +$66.8K |
|
|
OA
1683
CALL
DELISTED
Orbital ATK, Inc.
OA
| $103K | ﹤0.01% |
735
+555
| +308% | +$60.9K |
|
|
BSFT
1684
DELISTED
BroadSoft, Inc.
BSFT
| $103K | ﹤0.01% |
2,050
-26,703
| -93% | -$1.22M |
|
1685
CALL
Columbia Sportswear
COLM
$3.19B
| $102K | ﹤0.01% |
188
+47
| +33% | +$2.73K |
|
1686
Carter's
CRI
$1.43B
| $102K | ﹤0.01% |
1,039
+919
| +766% | +$81.8K |
|
1687
CALL
Diageo
DEO
$46.2B
| $102K | ﹤0.01% |
205
+69
| +51% | +$8.92K |
|
1688
Cedar Fair
FUN
$1.78B
| $102K | ﹤0.01% |
1,605
-3,094
| -66% | -$207K |
|
1689
PUT
Nutanix
NTNX
$14.9B
| $102K | ﹤0.01% |
1,756
+1,202
| +217% | +$26.3K |
|
1690
CALL
PTC Therapeutics
PTCT
$6.37B
| $102K | ﹤0.01% |
431
+231
| +116% | +$4.52K |
|
|
HDS
1691
CALL
DELISTED
HD Supply Holdings, Inc.
HDS
| $102K | ﹤0.01% |
518
+153
| +42% | +$4.92K |
|
1692
PUT
ASML
ASML
$675B
| $101K | ﹤0.01% |
435
+156
| +56% | +$23.9K |
|
1693
PUT
AB InBev
BUD
$158B
| $101K | ﹤0.01% |
769
-227
| -23% | -$26.6K |
|
1694
CALL
Golar LNG
GLNG
$4.95B
| $101K | ﹤0.01% |
377
-88
| -19% | -$1.93K |
|
1695
CALL
KRONOS Worldwide
KRO
$761M
| $101K | ﹤0.01% |
305
-21
| -6% | -$431 |
|
1696
PUT
Kohl's
KSS
$2.03B
| $101K | ﹤0.01% |
1,108
+115
| +12% | +$4.71K |
|
1697
Natera
NTRA
$37.5B
| $101K | ﹤0.01% |
+7,839
| New | +$87K |
|
1698
CALL
Interface
TILE
$1.91B
| $101K | ﹤0.01% |
542
-37
| -6% | -$721 |
|
1699
Teekay
TK
$975M
| $101K | ﹤0.01% |
11,386
-38,324
| -77% | -$335K |
|
|
NETI
1700
PUT
DELISTED
Eneti Inc.
NETI
| $101K | ﹤0.01% |
102
-86
| -46% | -$5.96K |
|
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.