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 | |
|---|---|---|---|---|---|---|
876
CALL
Procter & Gamble
PG
$340B
| $369K | 0.02% |
2,790
-582
| -17% | -$52.3K |
|
|
NEX
877
DELISTED
NexTier Oilfield Solutions Inc.
NEX
| $369K | 0.02% |
19,428
-10,827
| -36% | -$170K |
|
|
RDC
878
DELISTED
Rowan Companies Plc
RDC
| $368K | 0.02% |
23,514
+6,452
| +38% | +$90.7K |
|
|
KS
879
DELISTED
KapStone Paper and Pack Corp.
KS
| $368K | 0.02% |
16,245
+6,054
| +59% | +$134K |
|
880
APA Corp
APA
$13B
| $366K | 0.02% |
8,674
-109,370
| -93% | -$4.6M |
|
881
Editas Medicine
EDIT
$416M
| $365K | 0.02% |
11,885
+1,822
| +18% | +$45.9K |
|
882
CALL
Herbalife
HLF
$1.22B
| $364K | 0.02% |
1,476
+230
| +18% | +$8.06K |
|
883
CALL
MetLife
MET
$59.7B
| $364K | 0.02% |
2,494
-1,779
| -42% | -$93.7K |
|
|
GAP
884
CALL
The Gap Inc
GAP
$6.8B
| $364K | 0.02% |
1,373
+132
| +11% | +$3.94K |
|
885
Ecolab
ECL
$74B
| $363K | 0.02% |
+2,709
| New | +$360K |
|
886
CALL
Lumen
LUMN
$6.66B
| $361K | 0.02% |
4,789
+3,486
| +268% | +$59.1K |
|
887
CALL
Martin Marietta Materials
MLM
$32.8B
| $361K | 0.02% |
182
-221
| -55% | -$46.3K |
|
888
Vanguard FTSE Developed Markets ETF
VEA
$226B
| $361K | 0.02% |
+8,055
| New | +$356K |
|
|
CSOD
889
DELISTED
Cornerstone OnDemand, Inc.
CSOD
| $360K | 0.02% |
10,190
-7,178
| -41% | -$268K |
|
890
CALL
Equifax
EFX
$19.4B
| $359K | 0.02% |
343
-908
| -73% | -$102K |
|
891
Match Group
MTCH
$8.7B
| $359K | 0.02% |
+11,483
| New | +$322K |
|
|
CBL
892
DELISTED
CBL& Associates Properties, Inc.
CBL
| $359K | 0.02% |
+63,537
| New | +$425K |
|
893
EQT Corp
EQT
$33.5B
| $358K | 0.02% |
11,584
-38,096
| -77% | -$1.25M |
|
894
CALL
Snap
SNAP
$7.37B
| $357K | 0.02% |
4,017
+739
| +23% | +$10.8K |
|
895
Laureate Education
LAUR
$5.11B
| $356K | 0.02% |
+26,309
| New | +$345K |
|
896
Star Bulk Carriers
SBLK
$3.02B
| $356K | 0.02% |
31,637
-24,748
| -44% | -$257K |
|
897
PUT
Adobe
ADBE
$84.6B
| $355K | 0.02% |
1,578
-782
| -33% | -$135K |
|
898
Invesco
IVZ
$13.3B
| $354K | 0.02% |
9,705
-5,732
| -37% | -$207K |
|
899
PUT
Autodesk
ADSK
$43.2B
| $353K | 0.02% |
436
-202
| -32% | -$23.6K |
|
900
Dycom Industries
DY
$13.3B
| $353K | 0.02% |
+3,168
| New | +$306K |
|
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.