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 | |
|---|---|---|---|---|---|---|
551
Macerich
MAC
$7.19B
| $608K | 0.03% |
10,481
+10,131
| +2,895% | +$614K |
|
|
AL
552
DELISTED
Air Lease Corp
AL
| $603K | 0.03% |
+16,141
| New | +$603K |
|
553
CALL
RH
RH
$3.31B
| $603K | 0.03% |
684
-279
| -29% | -$14.8K |
|
554
PUT
Lam Research
LRCX
$399B
| $600K | 0.03% |
5,850
+4,530
| +343% | +$66.4K |
|
555
CALL
ServiceNow
NOW
$98.4B
| $600K | 0.03% |
985
-580
| -37% | -$11.4K |
|
556
PUT
Devon Energy
DVN
$51.8B
| $598K | 0.03% |
1,107
-132
| -11% | -$4.83K |
|
|
MASI
557
DELISTED
Masimo
MASI
| $598K | 0.03% |
6,559
+593
| +10% | +$54.4K |
|
558
CALL
MetLife
MET
$60B
| $598K | 0.03% |
2,633
-2,021
| -43% | -$93.7K |
|
559
PUT
Dick's Sporting Goods
DKS
$18.8B
| $597K | 0.03% |
796
-575
| -42% | -$25.9K |
|
560
CALL
Electronic Arts
EA
$52.4B
| $597K | 0.03% |
1,005
+32
| +3% | +$3.3K |
|
|
WBA
561
CALL
DELISTED
Walgreens Boots Alliance
WBA
| $597K | 0.03% |
4,015
+501
| +14% | +$41.2K |
|
562
Alcoa
AA
$12.2B
| $596K | 0.03% |
18,281
-87,332
| -83% | -$2.83M |
|
|
SIOX
563
CALL
DELISTED
Sio Gene Therapies Inc. Common Stock
SIOX
| $596K | 0.03% |
65
+18
| +38% | +$3.15K |
|
564
PUT
Dollar Tree
DLTR
$23.5B
| $595K | 0.03% |
900
-567
| -39% | -$43.8K |
|
|
FINL
565
DELISTED
Finish Line
FINL
| $595K | 0.03% |
42,010
+39,877
| +1,870% | +$579K |
|
566
Philips
PHG
$25.5B
| $594K | 0.03% |
21,872
-87,623
| -80% | -$2.3M |
|
567
ResMed
RMD
$28B
| $592K | 0.03% |
7,608
-1,112
| -13% | -$79.6K |
|
|
PPLC
568
CALL
DELISTED
PortfolioPlus S&P 500 ETF
PPLC
| $592K | 0.03% |
5,934
-5,094
| -46% | -$159K |
|
569
CALL
Lockheed Martin
LMT
$119B
| $591K | 0.03% |
806
+200
| +33% | +$54.9K |
|
|
PRTK
570
DELISTED
Paratek Pharmaceuticals, Inc.
PRTK
| $590K | 0.03% |
+24,492
| New | +$541K |
|
571
PUT
General Motors
GM
$74.1B
| $587K | 0.03% |
4,204
-1,957
| -32% | -$66.5K |
|
|
TWX
572
CALL
DELISTED
Time Warner Inc
TWX
| $587K | 0.03% |
2,606
+184
| +8% | +$18.2K |
|
573
FIVE9
FIVN
$1.76B
| $586K | 0.03% |
+27,236
| New | +$558K |
|
574
PUT
Molson Coors Class B
TAP
$7.7B
| $584K | 0.03% |
475
-37
| -7% | -$3.43K |
|
575
Century Communities
CCS
$1.86B
| $583K | 0.03% |
23,523
+16,845
| +252% | +$435K |
|
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.