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 | |
|---|---|---|---|---|---|---|
|
WPRT
626
PUT
Westport Fuel Systems
WPRT
$36.5M
| $246K | 0.03% |
25
+13
| +108% | +$575 |
|
627
PUT
Bausch Health
BHC
$1.7B
| $245K | 0.03% |
1,034
+43
| +4% | +$7.63K |
|
628
CRH
CRH
$66.9B
| $245K | 0.03% |
+9,378
| New | +$244K |
|
629
CALL
Nordic American Tanker
NAT
$1.35B
| $245K | 0.03% |
429
+380
| +776% | +$4.02K |
|
|
SEMG
630
DELISTED
SEMGROUP CORPORATION
SEMG
| $245K | 0.03% |
+3,023
| New | +$216K |
|
631
Southern Company
SO
$108B
| $244K | 0.03% |
+5,531
| New | +$263K |
|
632
Stryker
SYK
$119B
| $244K | 0.03% |
+2,645
| New | +$246K |
|
|
CHK
633
PUT
DELISTED
Chesapeake Energy Corporation
CHK
| $243K | 0.03% |
3
-2
| -40% | -$7.06K |
|
634
3D Systems Corp
DDD
$434M
| $242K | 0.03% |
+8,827
| New | +$260K |
|
635
ING
ING
$95.2B
| $242K | 0.03% |
16,589
+16,399
| +8,631% | +$224K |
|
636
CALL
Broadcom
AVGO
$1.89T
| $241K | 0.03% |
+2,280
| New | +$26.1K |
|
637
HDFC Bank
HDB
$119B
| $241K | 0.03% |
16,424
-7,868
| -32% | -$115K |
|
638
MGM Resorts International
MGM
$11.6B
| $241K | 0.03% |
11,464
-7,572
| -40% | -$159K |
|
639
PUT
Bristol-Myers Squibb
BMY
$124B
| $240K | 0.03% |
1,230
-517
| -30% | -$32.4K |
|
640
PRA Group
PRAA
$645M
| $240K | 0.03% |
4,424
+3,345
| +310% | +$179K |
|
|
SEE
641
DELISTED
Sealed Air
SEE
| $240K | 0.03% |
+5,279
| New | +$234K |
|
|
CEMP
642
DELISTED
Cempra, Inc.
CEMP
| $239K | 0.03% |
6,975
-3,296
| -32% | -$99.1K |
|
643
Loews
L
$23.6B
| $238K | 0.03% |
5,831
+5,805
| +22,327% | +$235K |
|
644
CALL
Zoetis
ZTS
$31.1B
| $238K | 0.03% |
965
+267
| +38% | +$12K |
|
645
Banco Bradesco
BBD
$39.4B
| $237K | 0.03% |
+54,516
| New | +$267K |
|
646
PUT
Las Vegas Sands
LVS
$30B
| $237K | 0.03% |
567
-457
| -45% | -$25.5K |
|
647
NiSource
NI
$22.3B
| $237K | 0.03% |
+13,664
| New | +$232K |
|
|
EIGR
648
DELISTED
Eiger BioPharmaceuticals, Inc.
EIGR
| $237K | 0.03% |
+28
| New | +$245K |
|
649
Merck
MRK
$315B
| $236K | 0.03% |
4,304
-11,694
| -73% | -$662K |
|
650
Urban Outfitters
URBN
$6.31B
| $236K | 0.03% |
5,190
-16,393
| -76% | -$637K |
|
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.