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 | |
|---|---|---|---|---|---|---|
301
Abercrombie & Fitch
ANF
$4.23B
| $545K | 0.06% |
24,740
+17,616
| +247% | +$434K |
|
|
PARA
302
CALL
DELISTED
Paramount Global Class B
PARA
| $543K | 0.06% |
786
+82
| +12% | +$4.79K |
|
303
Rio Tinto
RIO
$150B
| $543K | 0.06% |
+13,128
| New | +$593K |
|
|
MDCO
304
DELISTED
Medicines Co
MDCO
| $543K | 0.06% |
19,410
+18,168
| +1,463% | +$510K |
|
305
iShares China Large-Cap ETF
FXI
$4.29B
| $542K | 0.06% |
+12,224
| New | +$520K |
|
306
Signet Jewelers
SIG
$3.55B
| $540K | 0.06% |
3,896
+2,310
| +146% | +$286K |
|
307
Sony
SONY
$123B
| $540K | 0.06% |
+100,990
| New | +$510K |
|
308
Edwards Lifesciences
EW
$48.7B
| $539K | 0.06% |
22,740
-19,656
| -46% | -$441K |
|
309
CALL
Caterpillar
CAT
$413B
| $538K | 0.06% |
1,287
+975
| +313% | +$81K |
|
|
SUNE
310
CALL
DELISTED
SUNEDISON, INC COM
SUNE
| $537K | 0.06% |
1,626
+198
| +14% | +$4.26K |
|
311
Capri Holdings
CPRI
$1.84B
| $534K | 0.06% |
8,125
-16,970
| -68% | -$1.16M |
|
312
O'Reilly Automotive
ORLY
$71.9B
| $534K | 0.06% |
37,065
+18,885
| +104% | +$254K |
|
|
LUMO
313
CALL
DELISTED
Lumos Pharma, Inc. Common Stock
LUMO
| $531K | 0.06% |
38
+13
| +52% | +$5.04K |
|
314
KKR & Co
KKR
$85.7B
| $527K | 0.06% |
23,137
+22,554
| +3,869% | +$533K |
|
|
INFA
315
DELISTED
INFORMATICA CORP
INFA
| $527K | 0.06% |
12,033
+8,938
| +289% | +$372K |
|
|
SBNY
316
DELISTED
Signature Bank
SBNY
| $526K | 0.06% |
+4,066
| New | +$505K |
|
317
Occidental Petroleum
OXY
$57.2B
| $525K | 0.06% |
+7,210
| New | +$558K |
|
318
PUT
Ralph Lauren
RL
$23B
| $525K | 0.06% |
629
+424
| +207% | +$62.8K |
|
319
Vanguard FTSE Emerging Markets ETF
VWO
$121B
| $525K | 0.06% |
+12,866
| New | +$523K |
|
|
ADVM
320
DELISTED
Adverum Biotechnologies
ADVM
| $523K | 0.06% |
+1,292
| New | +$546K |
|
321
Bristol-Myers Squibb
BMY
$124B
| $522K | 0.06% |
+8,105
| New | +$507K |
|
322
ProShares UltraPro S&P 500
UPRO
$5.32B
| $522K | 0.06% |
+47,016
| New | +$522K |
|
323
Entergy
ETR
$53.7B
| $513K | 0.06% |
13,250
+7,940
| +150% | +$326K |
|
324
CALL
Whirlpool
WHR
$2.4B
| $513K | 0.06% |
249
+147
| +144% | +$29.9K |
|
325
CALL
Starbucks
SBUX
$119B
| $512K | 0.06% |
1,336
+386
| +41% | +$17.3K |
|
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.