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 | |
|---|---|---|---|---|---|---|
|
I
576
DELISTED
INTELSAT S. A.
I
| $271K | 0.03% |
22,628
+15,013
| +197% | +$216K |
|
577
CALL
Applied Materials
AMAT
$440B
| $270K | 0.03% |
+1,764
| New | +$42.3K |
|
578
Amplify Cybersecurity ETF
HACK
$2.66B
| $270K | 0.03% |
+9,665
| New | +$265K |
|
579
NetEase
NTES
$77.6B
| $270K | 0.03% |
12,850
+1,340
| +12% | +$28.3K |
|
580
Equity Residential
EQR
$25.6B
| $269K | 0.03% |
+3,463
| New | +$270K |
|
581
AvalonBay Communities
AVB
$27B
| $268K | 0.03% |
+1,543
| New | +$267K |
|
582
PUT
United Airlines
UAL
$38.1B
| $267K | 0.03% |
1,107
-201
| -15% | -$13.6K |
|
583
Boyd Gaming
BYD
$6.44B
| $265K | 0.03% |
18,674
+2,320
| +14% | +$31.9K |
|
584
PUT
Palo Alto Networks
PANW
$273B
| $265K | 0.03% |
2,628
+612
| +30% | +$13.7K |
|
|
ADVS
585
DELISTED
Advent Software Inc
ADVS
| $265K | 0.03% |
+6,028
| New | +$248K |
|
586
Citigroup
C
$222B
| $264K | 0.03% |
+5,143
| New | +$262K |
|
587
PUT
Abercrombie & Fitch
ANF
$4.27B
| $263K | 0.03% |
+702
| New | +$17.3K |
|
|
FARO
588
DELISTED
Faro Technologies
FARO
| $263K | 0.03% |
+4,234
| New | +$242K |
|
589
CALL
Neurocrine Biosciences
NBIX
$17.4B
| $263K | 0.03% |
126
-159
| -56% | -$5.69K |
|
590
CALL
Johnson & Johnson
JNJ
$615B
| $262K | 0.03% |
845
+393
| +87% | +$40K |
|
591
TJX Companies
TJX
$172B
| $262K | 0.03% |
+7,492
| New | +$255K |
|
592
CALL
Union Pacific
UNP
$174B
| $262K | 0.03% |
1,423
+525
| +58% | +$61.6K |
|
|
MW
593
DELISTED
THE MENS WAREHOUSE INC
MW
| $262K | 0.03% |
5,020
+3,726
| +288% | +$181K |
|
|
RHT
594
CALL
DELISTED
Red Hat Inc
RHT
| $262K | 0.03% |
242
+149
| +160% | +$10.1K |
|
595
Acuity Brands
AYI
$9.93B
| $261K | 0.03% |
+1,557
| New | +$244K |
|
596
Intercontinental Exchange
ICE
$80.6B
| $259K | 0.03% |
5,565
-18,705
| -77% | -$843K |
|
597
US Bancorp
USB
$100B
| $259K | 0.03% |
+5,931
| New | +$260K |
|
|
ODP
598
DELISTED
ODP
ODP
| $258K | 0.03% |
+2,811
| New | +$250K |
|
599
Sasol
SSL
$7.26B
| $257K | 0.03% |
+7,566
| New | +$272K |
|
600
TriNet
TNET
$2.76B
| $257K | 0.03% |
7,297
+4,420
| +154% | +$152K |
|
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.