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 | |
|---|---|---|---|---|---|---|
401
Blackrock
BLK
$164B
| $566K | 0.04% |
+1,903
| New | +$614K |
|
|
AET
402
CALL
DELISTED
Aetna Inc
AET
| $566K | 0.04% |
2,078
+575
| +38% | +$66.4K |
|
403
CALL
Pfizer
PFE
$141B
| $564K | 0.04% |
3,717
+3,254
| +703% | +$104K |
|
404
KLA
KLAC
$280B
| $563K | 0.04% |
112,600
+15,600
| +16% | +$80.2K |
|
405
Direxion Daily Energy Bull 2X ETF
ERX
$245M
| $561K | 0.04% |
2,194
+1,387
| +172% | +$495K |
|
|
NE
406
DELISTED
Noble Corporation
NE
| $558K | 0.04% |
51,197
+27,932
| +120% | +$351K |
|
407
PUT
Capri Holdings
CPRI
$1.86B
| $556K | 0.04% |
842
+373
| +80% | +$15.8K |
|
|
ICPT
408
DELISTED
Intercept Pharmaceuticals, Inc.
ICPT
| $555K | 0.04% |
3,348
-501
| -13% | -$110K |
|
|
AET
409
PUT
DELISTED
Aetna Inc
AET
| $549K | 0.04% |
1,306
+788
| +152% | +$91K |
|
410
CALL
NXP Semiconductors
NXPI
$70.4B
| $548K | 0.04% |
1,329
+882
| +197% | +$79.5K |
|
|
WLL
411
PUT
DELISTED
Whiting Petroleum Corporation
WLL
| $548K | 0.04% |
2
| – | – |
|
412
CALL
Eli Lilly
LLY
$1.04T
| $547K | 0.04% |
2,841
+2,256
| +386% | +$190K |
|
413
Commault Systems
CVLT
$5.81B
| $541K | 0.04% |
15,954
+12,126
| +317% | +$453K |
|
414
PPG Industries
PPG
$26.2B
| $541K | 0.04% |
+6,173
| New | +$628K |
|
|
ANAC
415
CALL
DELISTED
ANACOR PHARMACEUTICALS INC COM
ANAC
| $540K | 0.04% |
91
-223
| -71% | -$29.1K |
|
416
Eaton
ETN
$158B
| $538K | 0.04% |
+10,489
| New | +$619K |
|
417
Post Holdings
POST
$4.12B
| $538K | 0.04% |
13,923
+3,805
| +38% | +$149K |
|
418
Mastercard
MA
$470B
| $535K | 0.04% |
5,939
-13,963
| -70% | -$1.31M |
|
419
Entergy
ETR
$53.6B
| $534K | 0.04% |
16,414
+3,410
| +26% | +$116K |
|
|
RDUS
420
DELISTED
Radius Health, Inc.
RDUS
| $534K | 0.04% |
+7,708
| New | +$535K |
|
421
Coca-Cola
KO
$354B
| $533K | 0.04% |
13,310
-22,526
| -63% | -$902K |
|
422
ProShares Short QQQ
PSQ
$673M
| $532K | 0.04% |
1,831
+1,522
| +493% | +$424K |
|
|
MRO
423
PUT
DELISTED
Marathon Oil Corporation
MRO
| $532K | 0.04% |
723
+608
| +529% | +$11.5K |
|
424
PUT
Cleveland-Cliffs
CLF
$5.39B
| $530K | 0.04% |
318
+50
| +19% | +$160 |
|
425
PUT
McKesson
MCK
$95.3B
| $530K | 0.04% |
412
+332
| +415% | +$70.4K |
|
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.