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
|
+$83.1M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$37.2M |
| 3 |
Amgen
AMGN
|
+$30.5M |
| 4 |
Micron Technology
MU
|
+$28.8M |
| 5 |
Qualcomm
QCOM
|
+$18.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$29.5M |
| 2 |
Goldman Sachs
GS
|
+$27.8M |
| 3 |
Gilead Sciences
GILD
|
+$27.6M |
| 4 |
Booking.com
BKNG
|
+$25.4M |
| 5 |
AT&T
T
|
+$19.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 13.55% |
| 2 | Communication Services | 11.57% |
| 3 | Consumer Discretionary | 9.69% |
| 4 | Healthcare | 7.28% |
| 5 | Financials | 4.17% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
626
PUT
Adobe
ADBE
$86.8B
| $525K | 0.02% |
2,088
-62
| -3% | -$8.49K |
|
|
CXO
627
DELISTED
CONCHO RESOURCES INC.
CXO
| $524K | 0.02% |
+4,314
| New | +$545K |
|
|
PTLA
628
DELISTED
Portola Pharmaceuticals, Inc.
PTLA
| $522K | 0.02% |
9,299
-4,356
| -32% | -$174K |
|
629
iShares MSCI Malaysia ETF
EWM
$307M
| $521K | 0.02% |
16,449
+4,904
| +42% | +$156K |
|
630
Westlake Corp
WLK
$9.87B
| $521K | 0.02% |
+7,875
| New | +$500K |
|
|
SGEN
631
DELISTED
Seagen Inc. Common Stock
SGEN
| $521K | 0.02% |
10,082
+1,379
| +16% | +$87.7K |
|
632
Trex
TREX
$4.45B
| $520K | 0.02% |
+30,776
| New | +$519K |
|
|
FOLD
633
DELISTED
Amicus Therapeutics
FOLD
| $519K | 0.02% |
51,578
+21,447
| +71% | +$173K |
|
634
Murphy USA
MUSA
$11.4B
| $519K | 0.02% |
7,012
+6,361
| +977% | +$445K |
|
635
CALL
Universal Display
OLED
$3.81B
| $519K | 0.02% |
248
-66
| -21% | -$6.95K |
|
636
State Street SPDR S&P Metals & Mining ETF
XME
$4.12B
| $519K | 0.02% |
+17,336
| New | +$511K |
|
637
PUT
Kraft Heinz
KHC
$30.8B
| $517K | 0.02% |
2,634
-74
| -3% | -$6.71K |
|
638
PUT
Shopify
SHOP
$154B
| $517K | 0.02% |
13,950
+4,440
| +47% | +$37.6K |
|
|
PX
639
DELISTED
Praxair Inc
PX
| $517K | 0.02% |
+3,901
| New | +$500K |
|
640
Mercury Systems
MRCY
$5.94B
| $516K | 0.02% |
12,276
+4,263
| +53% | +$168K |
|
641
PUT
Range Resources
RRC
$9.13B
| $514K | 0.02% |
1,655
+494
| +43% | +$12.5K |
|
642
Kohl's
KSS
$2.16B
| $513K | 0.02% |
+13,286
| New | +$509K |
|
643
Trinity Industries
TRN
$2.87B
| $513K | 0.02% |
25,434
-1,742
| -6% | -$33.4K |
|
644
PUT
ProShares UltraShort Health Care
RXD
$3.38M
| $512K | 0.02% |
404
-393
| -49% | -$59.2K |
|
|
BRFS
645
DELISTED
BRF SA
BRFS
| $510K | 0.02% |
43,310
+33,971
| +364% | +$435K |
|
646
Cenovus Energy
CVE
$54.1B
| $510K | 0.02% |
69,301
+68,610
| +9,929% | +$637K |
|
647
PUT
Simon Property Group
SPG
$73.4B
| $509K | 0.02% |
833
-39
| -4% | -$6.35K |
|
|
SOHU
648
Sohu.com
SOHU
$336M
| $508K | 0.02% |
11,295
+10,474
| +1,276% | +$449K |
|
649
PUT
Skyworks Solutions
SWKS
$9.5B
| $508K | 0.02% |
1,508
+266
| +21% | +$27.3K |
|
650
PUT
American Airlines Group
AAL
$9.78B
| $505K | 0.02% |
3,930
-553
| -12% | -$25.7K |
|
Similar funds
Simplex Trading's Q2 2017 Portfolio in Review
As of Q2 2017, Simplex Trading held 7,527 positions worth $2.3B, down 0.39% from $2.31B the previous quarter. Its ten largest holdings account for 23% of the portfolio.
Simplex Trading withdrew a net $114M in Q2 2017, closing 1,474 positions and reducing 2,320 holdings. Its most notable exit was AT&T, an estimated $19.6M position sold in full.
By sector, the portfolio is most concentrated in Technology at 14% of assets, up from 9.7% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in Amgen worth $32.3M.
- Simplex Trading's largest Q2 2017 buy was Amgen: 187,633 shares worth $32.3M.
- Simplex Trading added most to Amazon in Q2 2017, an estimated $83.1M increase.
- Simplex Trading's biggest Q2 2017 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $29.5M.
- Simplex Trading fully exited AT&T in Q2 2017, selling an estimated $19.6M.
- Simplex Trading's ten largest holdings make up 23% of its $2.3B portfolio in Q2 2017.
- Simplex Trading opened 1,408 new positions and closed 1,474 in Q2 2017.
- Simplex Trading's portfolio value fell 0.39% quarter-over-quarter to $2.3B.
Based on Simplex Trading's 13F filing for Q2 2017, filed 12 Jul 2017.