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 | |
|---|---|---|---|---|---|---|
476
3D Systems Corp
DDD
$434M
| $761K | 0.03% |
+56,855
| New | +$833K |
|
477
Halliburton
HAL
$27.6B
| $761K | 0.03% |
16,548
-62,060
| -79% | -$2.6M |
|
478
CALL
Equifax
EFX
$20.3B
| $760K | 0.03% |
1,251
+1,240
| +11,273% | +$164K |
|
|
RHT
479
CALL
DELISTED
Red Hat Inc
RHT
| $760K | 0.03% |
1,530
+864
| +130% | +$88.4K |
|
480
iShares Expanded Tech Sector ETF
IGM
$10.3B
| $759K | 0.03% |
+29,346
| New | +$741K |
|
|
ABMD
481
DELISTED
Abiomed Inc
ABMD
| $756K | 0.03% |
4,487
+4,033
| +888% | +$610K |
|
482
CALL
Adobe
ADBE
$86.8B
| $753K | 0.03% |
1,600
+369
| +30% | +$55.1K |
|
483
Advance Auto Parts
AAP
$3.35B
| $750K | 0.03% |
+7,569
| New | +$764K |
|
484
PUT
Intel
INTC
$516B
| $748K | 0.03% |
4,396
-5,568
| -56% | -$198K |
|
485
PUT
ProShares UltraShort Industrials
SIJ
$5.96M
| $748K | 0.03% |
93
+36
| +63% | +$12K |
|
486
CALL
Wells Fargo
WFC
$262B
| $746K | 0.03% |
2,877
-1,739
| -38% | -$92.4K |
|
487
CALL
Waste Management
WM
$94.9B
| $744K | 0.03% |
866
-52
| -6% | -$3.95K |
|
488
Nektar Therapeutics
NKTR
$2.34B
| $743K | 0.03% |
2,064
+1,843
| +834% | +$577K |
|
489
CALL
JD.com
JD
$40.7B
| $742K | 0.03% |
2,918
-3,330
| -53% | -$143K |
|
490
PUT
McKesson
MCK
$95.3B
| $740K | 0.03% |
573
+407
| +245% | +$63.5K |
|
491
Conagra Brands
CAG
$7.1B
| $739K | 0.03% |
+21,912
| New | +$744K |
|
492
PUT
Advanced Micro Devices
AMD
$901B
| $738K | 0.03% |
8,920
-4,741
| -35% | -$61.9K |
|
493
PUT
Mastercard
MA
$470B
| $737K | 0.03% |
2,377
+260
| +12% | +$34.4K |
|
494
PUT
American International
AIG
$41.5B
| $736K | 0.03% |
1,660
-655
| -28% | -$40.8K |
|
495
CALL
Chevron
CVX
$384B
| $736K | 0.03% |
1,557
-916
| -37% | -$100K |
|
496
CALL
ConocoPhillips
COP
$145B
| $733K | 0.03% |
3,681
+1,583
| +75% | +$71.1K |
|
497
CALL
Applied Optoelectronics
AAOI
$8.87B
| $732K | 0.03% |
1,715
+460
| +37% | +$32.5K |
|
|
ZAYO
498
DELISTED
Zayo Group Holdings, Inc.
ZAYO
| $731K | 0.03% |
21,240
+13,645
| +180% | +$453K |
|
499
Vanguard FTSE Emerging Markets ETF
VWO
$121B
| $730K | 0.03% |
16,761
+7,657
| +84% | +$331K |
|
500
PUT
AT&T
T
$160B
| $729K | 0.03% |
6,760
+724
| +12% | +$20.6K |
|
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.