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 | |
|---|---|---|---|---|---|---|
226
PUT
Procter & Gamble
PG
$350B
| $1.06M | 0.08% |
2,625
+1,482
| +130% | +$111K |
|
227
Mettler-Toledo International
MTD
$26B
| $1.05M | 0.08% |
3,699
+3,611
| +4,103% | +$1.14M |
|
228
CALL
Goldman Sachs
GS
$324B
| $1.05M | 0.08% |
2,008
+252
| +14% | +$49.4K |
|
229
PUT
Berkshire Hathaway Class B
BRK.B
$1.05T
| $1.05M | 0.08% |
2,081
-1,748
| -46% | -$239K |
|
230
Under Armour
UAA
$3.13B
| $1.05M | 0.08% |
+21,773
| New | +$1.03M |
|
|
AY
231
DELISTED
Atlantica Sustainable Infrastructure plc Ordinary Shares
AY
| $1.04M | 0.08% |
63,091
+62,240
| +7,314% | +$1.49M |
|
|
DD
232
DELISTED
Du Pont De Nemours E I
DD
| $1.04M | 0.08% |
+21,543
| New | +$1.15M |
|
233
PUT
American Airlines Group
AAL
$10.1B
| $1.02M | 0.07% |
3,139
+151
| +5% | +$6.2K |
|
234
CALL
ProShares UltraShort Health Care
RXD
$3.35M
| $1.02M | 0.07% |
1,101
+677
| +160% | +$137K |
|
235
CALL
ProShares Ultra S&P500
SSO
$8.07B
| $1.01M | 0.07% |
20,000
+8,640
| +76% | +$67.4K |
|
236
PUT
Charter Communications
CHTR
$15.7B
| $1.01M | 0.07% |
220
+157
| +249% | +$28.7K |
|
237
ProShares UltraPro QQQ
TQQQ
$34.7B
| $1.01M | 0.07% |
554,448
+218,928
| +65% | +$483K |
|
|
DD
238
PUT
DELISTED
Du Pont De Nemours E I
DD
| $1.01M | 0.07% |
1,205
+206
| +21% | +$11K |
|
239
Ulta Beauty
ULTA
$20.8B
| $1M | 0.07% |
6,152
+5,357
| +674% | +$882K |
|
240
First Solar
FSLR
$22.7B
| $996K | 0.07% |
23,308
-19,347
| -45% | -$895K |
|
|
ETP
241
DELISTED
Energy Transfer Partners L.p.
ETP
| $994K | 0.07% |
24,224
+16,094
| +198% | +$780K |
|
242
PUT
Kinder Morgan
KMI
$72.4B
| $991K | 0.07% |
1,511
+562
| +59% | +$18.6K |
|
243
PUT
NOV
NOV
$7.25B
| $986K | 0.07% |
660
-90
| -12% | -$3.68K |
|
|
ESPR
244
PUT
DELISTED
Esperion Therapeutics
ESPR
| $985K | 0.07% |
217
-4
| -2% | -$251 |
|
|
245
CALL
Baidu
BIDU
$36.7B
| $980K | 0.07% |
5,246
+3,090
| +143% | +$509K |
|
246
PUT
Deere & Co
DE
$163B
| $970K | 0.07% |
1,300
+798
| +159% | +$70.2K |
|
247
PUT
Mastercard
MA
$472B
| $968K | 0.07% |
1,388
-108
| -7% | -$10.1K |
|
248
AB InBev
BUD
$160B
| $965K | 0.07% |
+9,081
| New | +$1.05M |
|
|
249
CALL
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$46.2B
| $963K | 0.07% |
5,061
+3,616
| +250% | +$617K |
|
250
PUT
PTC Therapeutics
PTCT
$6.52B
| $961K | 0.07% |
497
+330
| +198% | +$14.1K |
|
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.