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 |
CELG
Celgene Corp
CELG
|
+$31.6M |
| 2 |
Citigroup
C
|
+$19.5M |
| 3 |
AGN
Allergan plc
AGN
|
+$18.4M |
| 4 |
Baidu
BIDU
|
+$18M |
| 5 |
iShares MSCI Emerging Markets ETF
EEM
|
+$14.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$81.3M |
| 2 |
NVIDIA
NVDA
|
+$60.2M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$48.2M |
| 4 |
Apple
AAPL
|
+$48.2M |
| 5 |
Meta Platforms (Facebook)
META
|
+$31.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 11.27% |
| 2 | Technology | 10.64% |
| 3 | Healthcare | 7.06% |
| 4 | Communication Services | 6.92% |
| 5 | Industrials | 5.66% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
426
Graco
GGG
$12.3B
| $921K | 0.04% |
20,388
+9,027
| +79% | +$391K |
|
427
CALL
IBM
IBM
$193B
| $921K | 0.04% |
3,174
-10
| -0.3% | -$1.45K |
|
428
Intellia Therapeutics
NTLA
$1.56B
| $917K | 0.04% |
47,718
+42,202
| +765% | +$974K |
|
|
SINA
429
DELISTED
Sina Corp
SINA
| $917K | 0.04% |
+9,145
| New | +$976K |
|
430
CALL
JD.com
JD
$40.7B
| $916K | 0.04% |
5,077
+2,159
| +74% | +$85K |
|
|
GHL
431
DELISTED
Greenhill & Co., Inc.
GHL
| $910K | 0.04% |
+46,672
| New | +$868K |
|
432
Lumentum
LITE
$64.6B
| $909K | 0.04% |
18,591
-17,779
| -49% | -$991K |
|
433
Huntington Ingalls Industries
HII
$10.9B
| $899K | 0.04% |
3,815
+1,614
| +73% | +$381K |
|
|
SGI
434
Somnigroup International
SGI
$14.8B
| $898K | 0.04% |
57,352
+52,124
| +997% | +$795K |
|
435
PUT
Trip.com Group
TCOM
$26.8B
| $894K | 0.04% |
3,448
+966
| +39% | +$46.2K |
|
436
Textron
TXT
$15.9B
| $894K | 0.04% |
15,809
+5,419
| +52% | +$295K |
|
|
BEAT
437
DELISTED
BioTelemetry, Inc.
BEAT
| $892K | 0.04% |
29,858
+8,550
| +40% | +$248K |
|
|
ESRX
438
CALL
DELISTED
Express Scripts Holding Company
ESRX
| $889K | 0.04% |
948
-398
| -30% | -$25.5K |
|
|
IMMU
439
CALL
DELISTED
Immunomedics Inc
IMMU
| $884K | 0.04% |
2,005
+1,217
| +154% | +$14.4K |
|
440
CALL
Sarepta Therapeutics
SRPT
$1.67B
| $883K | 0.04% |
676
-1,210
| -64% | -$64.1K |
|
|
SLCA
441
DELISTED
U.S. SILICA HOLDINGS, INC.
SLCA
| $880K | 0.04% |
27,042
-12,639
| -32% | -$403K |
|
|
NXTM
442
DELISTED
NxStage Medical Inc.
NXTM
| $877K | 0.04% |
36,234
+11,927
| +49% | +$314K |
|
443
iShares Expanded Tech Sector ETF
IGM
$10.3B
| $874K | 0.04% |
31,098
+1,752
| +6% | +$48.4K |
|
444
CALL
UnitedHealth
UNH
$392B
| $874K | 0.04% |
465
-1,534
| -77% | -$325K |
|
445
Edison International
EIX
$30.9B
| $872K | 0.04% |
13,798
+8,805
| +176% | +$672K |
|
446
PUT
Western Digital
WDC
$192B
| $871K | 0.04% |
3,591
-1,119
| -24% | -$72.1K |
|
447
CALL
CSX Corp
CSX
$92.8B
| $869K | 0.04% |
10,086
+5,103
| +102% | +$90.4K |
|
448
PUT
Oracle
ORCL
$362B
| $868K | 0.04% |
3,598
+760
| +27% | +$37.3K |
|
449
Travelers Companies
TRV
$82.1B
| $868K | 0.04% |
+6,404
| New | +$845K |
|
450
iShares Expanded Tech-Software Sector ETF
IGV
$13.2B
| $867K | 0.04% |
28,065
| – | – |
|
Similar funds
Simplex Trading's Q4 2017 Portfolio in Review
As of Q4 2017, Simplex Trading held 7,407 positions worth $2.32B, down 5.1% from $2.45B the previous quarter. Its ten largest holdings account for 17% of the portfolio.
Simplex Trading withdrew a net $315M in Q4 2017, closing 1,460 positions and reducing 2,239 holdings. Its most notable exit was iShares 20+ Year Treasury Bond ETF, an estimated $21.1M position sold in full.
By sector, the portfolio is most concentrated in Consumer Discretionary at 11% of assets, down from 14% a quarter earlier, followed by Technology and Healthcare.
Against the trend, Simplex Trading opened a new position in Celgene Corp worth $29.2M.
- Simplex Trading's largest Q4 2017 buy was Celgene Corp: 280,194 shares worth $29.2M.
- Simplex Trading added most to Baidu in Q4 2017, an estimated $18M increase.
- Simplex Trading's biggest Q4 2017 reduction was Amazon, cutting an estimated $81.3M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q4 2017, selling an estimated $21.1M.
- Simplex Trading's ten largest holdings make up 17% of its $2.32B portfolio in Q4 2017.
- Simplex Trading opened 1,548 new positions and closed 1,460 in Q4 2017.
- Simplex Trading's portfolio value fell 5.1% quarter-over-quarter to $2.32B.
Based on Simplex Trading's 13F filing for Q4 2017, filed 10 Jan 2018.