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 |
iShares Russell 2000 ETF
IWM
|
+$29.8M |
| 2 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$17.1M |
| 3 |
Walt Disney
DIS
|
+$14.8M |
| 4 |
Gilead Sciences
GILD
|
+$11.8M |
| 5 |
iShares MSCI Emerging Markets ETF
EEM
|
+$11.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class C
GOOG
|
+$92.9M |
| 2 |
Apple
AAPL
|
+$22.5M |
| 3 |
Meta Platforms (Facebook)
META
|
+$20.5M |
| 4 |
IBM
IBM
|
+$12.7M |
| 5 |
Baidu
BIDU
|
+$10M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Healthcare | 6.46% |
| 2 | Communication Services | 4.66% |
| 3 | Consumer Discretionary | 4.6% |
| 4 | Technology | 4.57% |
| 5 | Financials | 4.49% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
AXON
801
PUT
Axon Enterprise
AXON
$39.7B
| $241K | 0.02% |
373
+269
| +259% | +$7.1K |
|
|
EXAS
802
CALL
DELISTED
Exact Sciences
EXAS
| $241K | 0.02% |
778
+342
| +78% | +$7.86K |
|
803
PUT
Capital One
COF
$121B
| $240K | 0.02% |
407
+285
| +234% | +$22.9K |
|
804
PUT
International Paper
IP
$20.4B
| $240K | 0.02% |
389
+170
| +78% | +$7.2K |
|
|
NAV
805
DELISTED
Navistar International
NAV
| $240K | 0.02% |
18,906
+12,158
| +180% | +$214K |
|
|
CXO
806
DELISTED
CONCHO RESOURCES INC.
CXO
| $240K | 0.02% |
+2,447
| New | +$257K |
|
807
Landstar System
LSTR
$7.06B
| $239K | 0.02% |
+3,780
| New | +$258K |
|
|
ATHN
808
DELISTED
Athenahealth, Inc.
ATHN
| $239K | 0.02% |
+1,799
| New | +$235K |
|
|
NSM
809
PUT
DELISTED
Nationstar Mortgage Holdings
NSM
| $238K | 0.02% |
135
-31
| -19% | -$521 |
|
810
ProShares UltraPro Short QQQ
SQQQ
$2.14B
| $237K | 0.02% |
+1
| New | +$238K |
|
811
State Street SPDR S&P Biotech ETF
XBI
$10.3B
| $237K | 0.02% |
+3,823
| New | +$301K |
|
|
ONIT
812
PUT
Onity Group
ONIT
$327M
| $237K | 0.02% |
44
+14
| +47% | +$1.77K |
|
813
Hilton Worldwide
HLT
$72.7B
| $236K | 0.02% |
3,437
+869
| +34% | +$67.2K |
|
814
Trimble
TRMB
$11.8B
| $236K | 0.02% |
14,378
+13,268
| +1,195% | +$268K |
|
815
Westlake Corp
WLK
$9.86B
| $236K | 0.02% |
4,562
+4,144
| +991% | +$242K |
|
|
AMAG
816
DELISTED
AMAG Pharmaceuticals
AMAG
| $235K | 0.02% |
5,919
+1,252
| +27% | +$77.7K |
|
|
SHLM
817
DELISTED
Schulman (A.) Inc
SHLM
| $235K | 0.02% |
7,261
+5,346
| +279% | +$189K |
|
|
OSG
818
Octave Specialty Group
OSG
$253M
| $234K | 0.02% |
16,194
+14,367
| +786% | +$233K |
|
819
PUT
Baxter International
BAX
$11.2B
| $234K | 0.02% |
551
-202
| -27% | -$7.65K |
|
820
PUT
Avis
CAR
$5.77B
| $234K | 0.02% |
139
+17
| +14% | +$737 |
|
821
Edwards Lifesciences
EW
$48.4B
| $233K | 0.02% |
9,852
+1,986
| +25% | +$47.9K |
|
822
Advanced Micro Devices
AMD
$887B
| $232K | 0.02% |
135,059
+121,316
| +883% | +$228K |
|
823
ProShares UltraShort Silver
ZSL
$94.3M
| $232K | 0.02% |
+24
| New | +$227K |
|
|
GOLD
824
PUT
DELISTED
Randgold Resources Ltd
GOLD
| $232K | 0.02% |
200
+33
| +20% | +$1.99K |
|
825
Encore Capital Group
ECPG
$1.79B
| $231K | 0.02% |
6,246
+6,196
| +12,392% | +$253K |
|
Similar funds
Simplex Trading's Q3 2015 Portfolio in Review
As of Q3 2015, Simplex Trading held 7,014 positions worth $1.36B, up 14% from $1.19B the previous quarter. Its ten largest holdings account for 15% of the portfolio.
Simplex Trading's Q3 2015 filing shows 1,810 new, 2,203 increased, 1,391 reduced and 1,420 closed positions. Its largest new stake was iShares Russell 2000 ETF: 251,486 shares worth $27.5M. The largest sale was Alphabet (Google) Class C, an estimated $92.9M.
By sector, the portfolio is most concentrated in Healthcare at 6.5% of assets, down from 7.8% a quarter earlier, followed by Communication Services and Consumer Discretionary.
- Simplex Trading's largest Q3 2015 buy was iShares Russell 2000 ETF: 251,486 shares worth $27.5M.
- Simplex Trading added most to iShares MSCI Emerging Markets ETF in Q3 2015, an estimated $11.2M increase.
- Simplex Trading's biggest Q3 2015 reduction was Alphabet (Google) Class C, cutting an estimated $92.9M.
- Simplex Trading fully exited IBM in Q3 2015, selling an estimated $12.7M.
- Simplex Trading's ten largest holdings make up 15% of its $1.36B portfolio in Q3 2015.
- Simplex Trading opened 1,810 new positions and closed 1,420 in Q3 2015.
- Simplex Trading's portfolio value rose 14% quarter-over-quarter to $1.36B.
Based on Simplex Trading's 13F filing for Q3 2015, filed 8 Oct 2015.