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 | |
|---|---|---|---|---|---|---|
|
PE
701
DELISTED
PARSLEY ENERGY INC
PE
| $211K | 0.02% |
13,249
+7,909
| +148% | +$124K |
|
|
DNKN
702
DELISTED
Dunkin' Brands Group, Inc.
DNKN
| $211K | 0.02% |
4,452
-1,945
| -30% | -$90.3K |
|
703
GSK
GSK
$101B
| $210K | 0.02% |
3,654
-16,353
| -82% | -$938K |
|
704
CALL
ProShares UltraShort Industrials
SIJ
$5.72M
| $210K | 0.02% |
61
+60
| +6,000% | +$40.4K |
|
705
ProShares UltraPro Short S&P 500
SPXU
$437M
| $210K | 0.02% |
+15
| New | +$222K |
|
|
XCO
706
PUT
DELISTED
Exco Resources
XCO
| $209K | 0.02% |
19
+13
| +217% | +$385 |
|
707
CALL
Delta Air Lines
DAL
$53.9B
| $207K | 0.02% |
698
-1,409
| -67% | -$65.3K |
|
708
CALL
Equinix
EQIX
$103B
| $206K | 0.02% |
112
+35
| +45% | +$7.92K |
|
709
Becton Dickinson
BDX
$42.5B
| $205K | 0.02% |
1,469
-2,898
| -66% | -$406K |
|
710
CALL
ConocoPhillips
COP
$149B
| $204K | 0.02% |
463
-98
| -17% | -$6.34K |
|
711
CALL
Merck
MRK
$323B
| $204K | 0.02% |
900
+282
| +46% | +$16K |
|
|
BTU
712
PUT
DELISTED
PEABODY ENERGY CORP COM STK NEW (DE)
BTU
| $204K | 0.02% |
33
+11
| +50% | +$1.11K |
|
713
PUT
Citigroup
C
$221B
| $203K | 0.02% |
611
-1,762
| -74% | -$89.7K |
|
714
Core Laboratories
CLB
$549M
| $203K | 0.02% |
+1,952
| New | +$208K |
|
715
PUT
Ionis Pharmaceuticals
IONS
$9.49B
| $203K | 0.02% |
383
+138
| +56% | +$9.36K |
|
716
Sensata Technologies
ST
$6.62B
| $203K | 0.02% |
+3,537
| New | +$188K |
|
|
LGF
717
DELISTED
Lions Gate Entertainment
LGF
| $203K | 0.02% |
+5,994
| New | +$188K |
|
718
CALL
Salesforce
CRM
$128B
| $202K | 0.02% |
977
+544
| +126% | +$33.7K |
|
719
PUT
F5
FFIV
$22.2B
| $202K | 0.02% |
160
+14
| +10% | +$1.65K |
|
720
Kroger
KR
$34.2B
| $202K | 0.02% |
5,280
+188
| +4% | +$6.71K |
|
|
PTLA
721
DELISTED
Portola Pharmaceuticals, Inc.
PTLA
| $202K | 0.02% |
5,338
+4,765
| +832% | +$164K |
|
722
Alkermes
ALKS
$8.89B
| $201K | 0.02% |
3,301
+24
| +0.7% | +$1.64K |
|
723
Equifax
EFX
$19.4B
| $201K | 0.02% |
+2,168
| New | +$192K |
|
724
CALL
Elevance Health
ELV
$82.7B
| $201K | 0.02% |
+283
| New | +$40.3K |
|
725
CALL
Intuit
INTU
$76.7B
| $201K | 0.02% |
163
+23
| +16% | +$2.14K |
|
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.