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 | |
|---|---|---|---|---|---|---|
326
American Tower
AMT
$77.4B
| $694K | 0.05% |
7,898
-15,057
| -66% | -$1.42M |
|
327
PUT
Ambarella
AMBA
$3.03B
| $691K | 0.05% |
505
-660
| -57% | -$62.3K |
|
328
PUT
F5
FFIV
$22.6B
| $689K | 0.05% |
514
+156
| +44% | +$19.1K |
|
329
United States Natural Gas Fund
UNG
$472M
| $685K | 0.05% |
+3,688
| New | +$769K |
|
330
PUT
Microsoft
MSFT
$2.9T
| $683K | 0.05% |
3,096
+2,176
| +237% | +$97.7K |
|
331
The Mosaic Company
MOS
$7.24B
| $682K | 0.05% |
21,951
-14,005
| -39% | -$578K |
|
|
332
Microsoft
MSFT
$2.9T
| $682K | 0.05% |
+15,429
| New | +$693K |
|
|
RSX
333
DELISTED
VanEck Russia ETF
RSX
| $681K | 0.05% |
43,436
-6,743
| -13% | -$111K |
|
334
Aon
AON
$75.2B
| $680K | 0.05% |
7,685
+449
| +6% | +$43.5K |
|
335
Philips
PHG
$25.5B
| $679K | 0.05% |
40,460
+40,013
| +8,951% | +$744K |
|
|
POT
336
PUT
DELISTED
Potash Corp Of Saskatchewan
POT
| $679K | 0.05% |
1,250
+1,045
| +510% | +$27.4K |
|
337
PUT
ProShares Ultra S&P500
SSO
$8.02B
| $675K | 0.05% |
8,792
-1,872
| -18% | -$14.6K |
|
338
Delta Air Lines
DAL
$54.9B
| $671K | 0.05% |
14,969
-13,124
| -47% | -$589K |
|
339
State Street SPDR S&P Homebuilders ETF
XHB
$1.71B
| $671K | 0.05% |
19,606
-5,280
| -21% | -$194K |
|
340
CALL
iShares MSCI Australia ETF
EWA
$1.35B
| $668K | 0.05% |
6,647
+4,427
| +199% | +$86.7K |
|
341
PUT
Opko Health
OPK
$891M
| $667K | 0.05% |
942
+472
| +100% | +$6.25K |
|
342
Yelp
YELP
$1.36B
| $664K | 0.05% |
30,676
-52,969
| -63% | -$1.47M |
|
|
AY
343
PUT
DELISTED
Atlantica Sustainable Infrastructure plc Ordinary Shares
AY
| $663K | 0.05% |
953
+930
| +4,043% | +$22.2K |
|
|
MJN
344
DELISTED
Mead Johnson Nutrition Company
MJN
| $658K | 0.05% |
9,355
+1,001
| +12% | +$82.3K |
|
345
CALL
Molson Coors Class B
TAP
$7.7B
| $654K | 0.05% |
1,970
+1,322
| +204% | +$95.7K |
|
346
Charter Communications
CHTR
$15.9B
| $653K | 0.05% |
+3,716
| New | +$678K |
|
347
Magna International
MGA
$18.4B
| $653K | 0.05% |
13,611
+10,086
| +286% | +$522K |
|
348
PUT
Visa
V
$672B
| $653K | 0.05% |
2,259
+643
| +40% | +$45.9K |
|
|
DCP
349
DELISTED
DCP Midstream, LP
DCP
| $653K | 0.05% |
27,012
+23,686
| +712% | +$686K |
|
350
PUT
Blackstone
BX
$150B
| $652K | 0.05% |
1,595
+1,301
| +443% | +$47.1K |
|
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.