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 |
Alphabet (Google) Class C
GOOG
|
+$40.1M |
| 2 |
Berkshire Hathaway Class B
BRK.B
|
+$12.5M |
| 3 |
Alibaba
BABA
|
+$10.5M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$9.89M |
| 5 |
Intel
INTC
|
+$9.83M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$35.7M |
| 2 |
Gilead Sciences
GILD
|
+$32.3M |
| 3 |
Amazon
AMZN
|
+$29M |
| 4 |
Booking.com
BKNG
|
+$28.4M |
| 5 |
Baidu
BIDU
|
+$13.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 7.76% |
| 2 | Consumer Discretionary | 7.62% |
| 3 | Healthcare | 7.24% |
| 4 | Technology | 6.95% |
| 5 | Financials | 4.83% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
ENDP
451
CALL
DELISTED
Endo International plc
ENDP
| $351K | 0.04% |
+150
| New | +$12.5K |
|
452
Invesco DB Agriculture Fund
DBA
$1.26B
| $350K | 0.04% |
+15,820
| New | +$368K |
|
453
HCI Group
HCI
$2.24B
| $350K | 0.04% |
+7,652
| New | +$354K |
|
454
Teradata
TDC
$2.64B
| $350K | 0.04% |
7,945
-13,402
| -63% | -$586K |
|
455
PUT
United Parcel Service
UPS
$98.5B
| $349K | 0.04% |
466
+22
| +5% | +$2.26K |
|
456
BP
BP
$112B
| $348K | 0.04% |
10,734
-21,586
| -67% | -$707K |
|
|
MBLY
457
PUT
DELISTED
Mobileye N.V.
MBLY
| $347K | 0.04% |
+585
| New | +$22.8K |
|
458
Prothena Corp
PRTA
$442M
| $345K | 0.04% |
9,060
+505
| +6% | +$13K |
|
459
Packaging Corp of America
PKG
$20.3B
| $344K | 0.04% |
4,403
-1,052
| -19% | -$83.5K |
|
460
PUT
Occidental Petroleum
OXY
$57.2B
| $343K | 0.04% |
392
-165
| -30% | -$12.8K |
|
|
AGN
461
PUT
DELISTED
Allergan plc
AGN
| $343K | 0.04% |
+1,139
| New | +$325K |
|
|
462
Apple
AAPL
$4.79T
| $342K | 0.04% |
11,000
-1,182,152
| -99% | -$35.7M |
|
463
CALL
JPMorgan Chase
JPM
$926B
| $342K | 0.04% |
2,304
+1,462
| +174% | +$86.6K |
|
464
Kimberly-Clark
KMB
$36.1B
| $342K | 0.04% |
3,197
-533
| -14% | -$58.9K |
|
|
MBLY
465
CALL
DELISTED
Mobileye N.V.
MBLY
| $342K | 0.04% |
+975
| New | +$38K |
|
|
CERN
466
DELISTED
Cerner Corp
CERN
| $339K | 0.04% |
+4,632
| New | +$321K |
|
467
Agilent Technologies
A
$37.7B
| $338K | 0.04% |
+8,156
| New | +$330K |
|
468
Advanced Micro Devices
AMD
$901B
| $338K | 0.04% |
+126,412
| New | +$355K |
|
469
Bank of Montreal
BMO
$125B
| $338K | 0.04% |
5,638
+3,499
| +164% | +$217K |
|
470
CALL
WisdomTree US Total Dividend Fund
DTD
$1.65B
| $338K | 0.04% |
2,256
-120
| -5% | -$4.48K |
|
471
CALL
HCA Healthcare
HCA
$82.5B
| $337K | 0.04% |
377
-411
| -52% | -$29.5K |
|
472
CALL
Accenture
ACN
$85.7B
| $336K | 0.04% |
+396
| New | +$35.4K |
|
473
Meritage Homes
MTH
$4.82B
| $336K | 0.04% |
+13,826
| New | +$279K |
|
|
ICON
474
DELISTED
Iconix Brand Group, Inc.
ICON
| $335K | 0.04% |
996
-724
| -42% | -$249K |
|
475
State Street SPDR EURO STOXX 50 ETF
FEZ
$4.33B
| $334K | 0.04% |
8,610
+6,006
| +231% | +$227K |
|
Similar funds
Simplex Trading's Q1 2015 Portfolio in Review
As of Q1 2015, Simplex Trading held 6,670 positions worth $860M, up 4.2% from $826M the previous quarter. Its ten largest holdings account for 15% of the portfolio.
Simplex Trading's Q1 2015 filing shows 1,973 new, 1,386 increased, 1,513 reduced and 1,643 closed positions. Its largest new stake was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M. The largest sale was Apple, an estimated $35.7M.
By sector, the portfolio is most concentrated in Communication Services at 7.8% of assets, up from 4.8% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q1 2015 buy was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M.
- Simplex Trading added most to Alibaba in Q1 2015, an estimated $10.5M increase.
- Simplex Trading's biggest Q1 2015 reduction was Apple, cutting an estimated $35.7M.
- Simplex Trading fully exited Amazon in Q1 2015, selling an estimated $29M.
- Simplex Trading's ten largest holdings make up 15% of its $860M portfolio in Q1 2015.
- Simplex Trading opened 1,973 new positions and closed 1,643 in Q1 2015.
- Simplex Trading's portfolio value rose 4.2% quarter-over-quarter to $860M.
Based on Simplex Trading's 13F filing for Q1 2015, filed 21 Apr 2015.