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 | |
|---|---|---|---|---|---|---|
401
CALL
ProShares Ultra S&P500
SSO
$8.02B
| $937K | 0.04% |
12,024
-4,824
| -29% | -$56K |
|
402
PUT
UnitedHealth
UNH
$392B
| $935K | 0.04% |
2,202
+63
| +3% | +$12.2K |
|
403
CubeSmart
CUBE
$9.31B
| $930K | 0.04% |
35,833
+35,289
| +6,487% | +$873K |
|
404
PUT
Biogen
BIIB
$29.2B
| $920K | 0.04% |
1,260
-377
| -23% | -$112K |
|
405
Teradyne
TER
$57.8B
| $918K | 0.04% |
24,624
+15,870
| +181% | +$550K |
|
406
Louisiana-Pacific
LPX
$5.07B
| $917K | 0.04% |
33,876
+23,287
| +220% | +$593K |
|
407
PUT
Walmart Inc
WMT
$870B
| $917K | 0.04% |
15,753
+1,521
| +11% | +$39.9K |
|
408
CALL
ExxonMobil
XOM
$640B
| $916K | 0.04% |
5,718
-684
| -11% | -$54.3K |
|
409
PUT
Viatris
VTRS
$19.8B
| $912K | 0.04% |
1,964
-396
| -17% | -$13.4K |
|
410
CALL
NRG Energy
NRG
$29.5B
| $911K | 0.04% |
1,256
+336
| +37% | +$7.95K |
|
|
MRTX
411
DELISTED
Mirati Therapeutics, Inc. Common Stock
MRTX
| $911K | 0.04% |
77,903
+77,580
| +24,019% | +$449K |
|
|
PRTK
412
DELISTED
Paratek Pharmaceuticals, Inc.
PRTK
| $911K | 0.04% |
36,318
+11,826
| +48% | +$275K |
|
|
GG.WS.A
413
PUT
DELISTED
GOLDCORP INC SERIES A WARRANTS EXP 5/30/2007
GG.WS.A
| $911K | 0.04% |
1,994
-137
| -6% | -$62.6K |
|
414
CALL
Deere & Co
DE
$164B
| $904K | 0.04% |
1,295
-389
| -23% | -$48K |
|
415
ICICI Bank
IBN
$106B
| $903K | 0.04% |
105,592
+23,864
| +29% | +$218K |
|
416
SAP
SAP
$174B
| $901K | 0.04% |
8,225
-13,303
| -62% | -$1.41M |
|
417
Coty
COTY
$2.4B
| $895K | 0.04% |
54,198
-2,231
| -4% | -$40.4K |
|
418
CALL
Electronic Arts
EA
$52.4B
| $894K | 0.04% |
1,052
+47
| +5% | +$5.44K |
|
|
X
419
CALL
DELISTED
US Steel
X
| $892K | 0.04% |
3,423
-2,940
| -46% | -$72K |
|
420
CALL
Lowe's Companies
LOW
$115B
| $891K | 0.04% |
1,854
-1,158
| -38% | -$88.7K |
|
421
Brighthouse Financial
BHF
$3.62B
| $886K | 0.04% |
+14,573
| New | +$831K |
|
422
CALL
Northrop Grumman
NOC
$74.6B
| $885K | 0.04% |
520
+260
| +100% | +$70K |
|
423
CALL
Johnson & Johnson
JNJ
$615B
| $882K | 0.04% |
3,535
-576
| -14% | -$76.4K |
|
|
EBIX
424
DELISTED
Ebix Inc
EBIX
| $881K | 0.04% |
13,513
+10,677
| +376% | +$615K |
|
425
Investcorp Credit Management BDC
ICMB
$11.2M
| $879K | 0.04% |
94,773
+50,934
| +116% | +$504K |
|
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.