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 | |
|---|---|---|---|---|---|---|
526
PUT
Caterpillar
CAT
$410B
| $673K | 0.03% |
5,682
-421
| -7% | -$48.5K |
|
527
PUT
Freeport-McMoran
FCX
$93.4B
| $672K | 0.03% |
4,334
-4,214
| -49% | -$59.2K |
|
528
Direxion Daily Semiconductor Bull 3X ETF
SOXL
$22B
| $670K | 0.03% |
+87,195
| New | +$563K |
|
|
NXTM
529
DELISTED
NxStage Medical Inc.
NXTM
| $670K | 0.03% |
24,307
+15,793
| +185% | +$421K |
|
|
BZUN
530
Baozun
BZUN
$144M
| $669K | 0.03% |
20,445
+20,145
| +6,715% | +$637K |
|
531
Hormel Foods
HRL
$13.9B
| $669K | 0.03% |
20,841
-7,548
| -27% | -$247K |
|
532
CALL
Oracle
ORCL
$362B
| $664K | 0.03% |
2,855
-2,706
| -49% | -$135K |
|
533
CALL
Charter Communications
CHTR
$15.9B
| $663K | 0.03% |
456
-157
| -26% | -$58.4K |
|
534
GoDaddy
GDDY
$11.8B
| $663K | 0.03% |
15,254
+13,249
| +661% | +$571K |
|
535
InterDigital
IDCC
$6.7B
| $663K | 0.03% |
9,000
+7,903
| +720% | +$578K |
|
536
Okta
OKTA
$23.8B
| $661K | 0.03% |
23,462
+20,083
| +594% | +$509K |
|
537
CALL
Nike
NKE
$62.6B
| $659K | 0.03% |
3,400
-1,474
| -30% | -$82.7K |
|
|
538
PUT
Micron Technology
MU
$1.08T
| $655K | 0.03% |
12,338
-7,757
| -39% | -$245K |
|
539
TG Therapeutics
TGTX
$8.06B
| $655K | 0.03% |
55,301
+34,535
| +166% | +$393K |
|
540
Conduent
CNDT
$234M
| $654K | 0.03% |
41,778
-7,619
| -15% | -$124K |
|
541
Progressive
PGR
$119B
| $651K | 0.03% |
13,464
+8,821
| +190% | +$413K |
|
|
DFS
542
DELISTED
Discover Financial Services
DFS
| $650K | 0.03% |
10,092
+9,849
| +4,053% | +$597K |
|
543
CALL
PayPal
PYPL
$49B
| $649K | 0.03% |
1,819
-1,340
| -42% | -$80.3K |
|
544
CALL
Fastenal
FAST
$52B
| $648K | 0.03% |
3,984
+2,556
| +179% | +$27.5K |
|
|
USCR
545
DELISTED
U S Concrete, Inc.
USCR
| $647K | 0.03% |
8,491
+5,784
| +214% | +$444K |
|
|
FTR
546
PUT
DELISTED
Frontier Communications Corp.
FTR
| $647K | 0.03% |
963
+958
| +19,160% | +$13.5K |
|
|
CY
547
DELISTED
Cypress Semiconductor
CY
| $647K | 0.03% |
43,132
-18,958
| -31% | -$265K |
|
|
CTRA
548
DELISTED
Coterra Energy
CTRA
| $645K | 0.03% |
24,133
+10,186
| +73% | +$259K |
|
549
Park Hotels & Resorts
PK
$3.03B
| $645K | 0.03% |
23,429
+5,865
| +33% | +$157K |
|
|
KEM
550
DELISTED
KEMET Corporation
KEM
| $643K | 0.03% |
30,439
+28,245
| +1,287% | +$534K |
|
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.