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 | |
|---|---|---|---|---|---|---|
426
SL Green Realty
SLG
$3.56B
| $372K | 0.04% |
+2,995
| New | +$370K |
|
|
MWE
427
DELISTED
MARKWEST ENERGY PARTNERS, LP
MWE
| $371K | 0.04% |
+5,625
| New | +$346K |
|
428
Invesco CurrencyShares Australian Dollar Trust
FXA
$97M
| $370K | 0.04% |
+4,853
| New | +$382K |
|
429
PUT
Invesco QQQ Trust
QQQ
$469B
| $369K | 0.04% |
+1,151
| New | +$121K |
|
430
United States Natural Gas Fund
UNG
$472M
| $369K | 0.04% |
+1,745
| New | +$398K |
|
431
CALL
Zillow
ZG
$7.17B
| $365K | 0.04% |
2,790
+735
| +36% | +$26K |
|
|
VIAB
432
DELISTED
Viacom Inc. Class B
VIAB
| $365K | 0.04% |
+5,351
| New | +$369K |
|
433
CALL
American International
AIG
$41.5B
| $364K | 0.04% |
+798
| New | +$42.8K |
|
434
Realty Income
O
$60.6B
| $364K | 0.04% |
+7,281
| New | +$364K |
|
435
CALL
GoPro
GPRO
$128M
| $362K | 0.04% |
2,252
-1,832
| -45% | -$86.4K |
|
|
NP
436
DELISTED
Neenah, Inc. Common Stock
NP
| $362K | 0.04% |
+5,801
| New | +$347K |
|
437
Trinity Industries
TRN
$2.87B
| $361K | 0.04% |
+14,155
| New | +$309K |
|
438
PUT
Visa
V
$672B
| $361K | 0.04% |
3,486
+1,446
| +71% | +$95.6K |
|
|
AKRX
439
DELISTED
Akorn Inc
AKRX
| $361K | 0.04% |
7,602
+5,183
| +214% | +$235K |
|
|
FMI
440
DELISTED
Foundation Medicine, Inc.
FMI
| $361K | 0.04% |
7,514
+1,682
| +29% | +$76.3K |
|
|
NBIS
441
Nebius Group N.V.
NBIS
$55.4B
| $359K | 0.04% |
23,732
-37,623
| -61% | -$605K |
|
|
HOUS
442
DELISTED
Anywhere Real Estate
HOUS
| $358K | 0.04% |
7,878
-4,609
| -37% | -$212K |
|
443
CALL
Teva Pharmaceuticals
TEVA
$35.1B
| $357K | 0.04% |
1,292
+989
| +326% | +$57.5K |
|
|
BPL
444
DELISTED
Buckeye Partners, L.P.
BPL
| $355K | 0.04% |
+4,712
| New | +$353K |
|
445
CALL
AbbVie
ABBV
$448B
| $354K | 0.04% |
2,140
+875
| +69% | +$52.9K |
|
|
LO
446
DELISTED
LORILLARD INC COM STK
LO
| $354K | 0.04% |
+5,430
| New | +$362K |
|
447
CALL
Humana
HUM
$47.7B
| $353K | 0.04% |
187
+45
| +32% | +$7.12K |
|
448
Sherwin-Williams
SHW
$78.9B
| $353K | 0.04% |
+3,732
| New | +$348K |
|
|
449
CALL
Intel
INTC
$516B
| $352K | 0.04% |
3,089
+696
| +29% | +$23.5K |
|
450
Veeva Systems
VEEV
$30B
| $352K | 0.04% |
13,818
+12,852
| +1,330% | +$362K |
|
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.