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 | |
|---|---|---|---|---|---|---|
276
iShares MSCI Spain ETF
EWP
$2B
| $851K | 0.06% |
28,712
+26,255
| +1,069% | +$857K |
|
277
PUT
ConocoPhillips
COP
$145B
| $850K | 0.06% |
1,649
+722
| +78% | +$36.7K |
|
|
MBLY
278
PUT
DELISTED
Mobileye N.V.
MBLY
| $848K | 0.06% |
972
+307
| +46% | +$16.9K |
|
|
JOY
279
DELISTED
Joy Global Inc
JOY
| $847K | 0.06% |
56,776
+45,875
| +421% | +$1.11M |
|
280
AutoZone
AZO
$48.5B
| $841K | 0.06% |
1,163
-3,794
| -77% | -$2.69M |
|
281
PUT
Union Pacific
UNP
$174B
| $839K | 0.06% |
1,059
-283
| -21% | -$25.8K |
|
|
TWX
282
DELISTED
Time Warner Inc
TWX
| $838K | 0.06% |
+12,194
| New | +$958K |
|
|
TWTR
283
CALL
DELISTED
Twitter, Inc.
TWTR
| $835K | 0.06% |
6,421
+2,315
| +56% | +$69.5K |
|
|
GOLD
284
DELISTED
Randgold Resources Ltd
GOLD
| $833K | 0.06% |
14,205
+3,257
| +30% | +$196K |
|
|
ICPT
285
PUT
DELISTED
Intercept Pharmaceuticals, Inc.
ICPT
| $821K | 0.06% |
69
-48
| -41% | -$10.6K |
|
286
Novartis
NVS
$292B
| $820K | 0.06% |
9,957
+9,400
| +1,688% | +$837K |
|
287
PUT
Skyworks Solutions
SWKS
$9.5B
| $820K | 0.06% |
1,278
+912
| +249% | +$83.4K |
|
|
STJ
288
DELISTED
St Jude Medical
STJ
| $819K | 0.06% |
12,996
+9,049
| +229% | +$646K |
|
289
Abercrombie & Fitch
ANF
$4.27B
| $817K | 0.06% |
38,588
+6,896
| +22% | +$140K |
|
290
PUT
American Express
AXP
$238B
| $810K | 0.06% |
1,424
-636
| -31% | -$48.9K |
|
291
Bunge Global
BG
$24B
| $809K | 0.06% |
+11,038
| New | +$854K |
|
|
JOY
292
PUT
DELISTED
Joy Global Inc
JOY
| $807K | 0.06% |
1,236
+1,037
| +521% | +$25.2K |
|
293
Incyte
INCY
$23.1B
| $804K | 0.06% |
7,295
+4,590
| +170% | +$515K |
|
|
294
PUT
AutoZone
AZO
$48.5B
| $803K | 0.06% |
262
-56
| -18% | -$39.7K |
|
|
TFCF
295
DELISTED
Twenty-First Century Fox, Inc. Class B
TFCF
| $799K | 0.06% |
+29,519
| New | +$876K |
|
|
WFM
296
PUT
DELISTED
Whole Foods Market Inc
WFM
| $798K | 0.06% |
953
+584
| +158% | +$20.6K |
|
297
Advance Auto Parts
AAP
$3.35B
| $793K | 0.06% |
+4,187
| New | +$726K |
|
298
CALL
Under Armour
UAA
$3.1B
| $791K | 0.06% |
1,867
+153
| +9% | +$7.22K |
|
|
BLUE
299
PUT
DELISTED
bluebird bio
BLUE
| $786K | 0.06% |
16
+3
| +23% | +$5.47K |
|
300
PUT
United Rentals
URI
$64.8B
| $783K | 0.06% |
558
+254
| +84% | +$17.6K |
|
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.