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 | |
|---|---|---|---|---|---|---|
426
Sonida Senior Living
SNDA
$1.89B
| $530K | 0.04% |
1,765
+1,677
| +1,906% | +$553K |
|
|
FIT
427
CALL
DELISTED
Fitbit, Inc. Class A common stock
FIT
| $529K | 0.04% |
2,145
+2,132
| +16,400% | +$87.1K |
|
|
BDSI
428
DELISTED
BioDelivery Sciences International, Inc.
BDSI
| $528K | 0.04% |
95,130
+83,457
| +715% | +$616K |
|
429
iShares MSCI ACWI ETF
ACWI
$33B
| $527K | 0.04% |
9,782
+6,885
| +238% | +$396K |
|
|
ALXN
430
DELISTED
Alexion Pharmaceuticals
ALXN
| $524K | 0.04% |
3,351
+349
| +12% | +$63.7K |
|
431
PUT
Lam Research
LRCX
$399B
| $523K | 0.04% |
4,700
+4,210
| +859% | +$30.9K |
|
|
SKX
432
CALL
DELISTED
Skechers
SKX
| $521K | 0.04% |
1,569
+660
| +73% | +$30K |
|
433
PUT
Zillow
Z
$7.18B
| $518K | 0.04% |
+446
| New | +$11.6K |
|
|
BWLD
434
DELISTED
Buffalo Wild Wings, Inc.
BWLD
| $516K | 0.04% |
2,672
-1,856
| -41% | -$348K |
|
|
SNDK
435
PUT
DELISTED
SANDISK CORP
SNDK
| $516K | 0.04% |
768
+271
| +55% | +$15K |
|
|
ESRX
436
PUT
DELISTED
Express Scripts Holding Company
ESRX
| $515K | 0.04% |
977
+373
| +62% | +$32.5K |
|
|
YHOO
437
DELISTED
Yahoo Inc
YHOO
| $514K | 0.04% |
+17,789
| New | +$617K |
|
438
Shutterstock
SSTK
$271M
| $511K | 0.04% |
16,928
+12,810
| +311% | +$514K |
|
439
PUT
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$27B
| $509K | 0.04% |
414
+61
| +17% | +$16.2K |
|
|
FOLD
440
DELISTED
Amicus Therapeutics
FOLD
| $508K | 0.04% |
36,347
+26,188
| +258% | +$411K |
|
|
NE
441
PUT
DELISTED
Noble Corporation
NE
| $506K | 0.04% |
1,421
+822
| +137% | +$10.3K |
|
442
Toyota
TM
$213B
| $505K | 0.04% |
4,309
+2,671
| +163% | +$335K |
|
|
ENDP
443
DELISTED
Endo International plc
ENDP
| $505K | 0.04% |
7,294
-8,430
| -54% | -$675K |
|
444
Enovis
ENOV
$1.53B
| $502K | 0.04% |
+9,753
| New | +$647K |
|
445
DexCom
DXCM
$27.6B
| $501K | 0.04% |
+23,352
| New | +$521K |
|
446
PUT
Oracle
ORCL
$362B
| $500K | 0.04% |
1,860
+1,459
| +364% | +$56.1K |
|
447
CALL
Advance Auto Parts
AAP
$3.35B
| $499K | 0.04% |
114
| – | – |
|
448
Southwest Airlines
LUV
$23.3B
| $499K | 0.04% |
13,121
-74,189
| -85% | -$2.74M |
|
|
PPLC
449
PUT
DELISTED
PortfolioPlus S&P 500 ETF
PPLC
| $499K | 0.04% |
458
+383
| +511% | +$9.75K |
|
450
PUT
CVS Health
CVS
$138B
| $495K | 0.04% |
865
+399
| +86% | +$41.9K |
|
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.