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 | |
|---|---|---|---|---|---|---|
451
Sociedad Química y Minera de Chile
SQM
$19.8B
| $867K | 0.04% |
14,607
+11,787
| +418% | +$676K |
|
452
PUT
General Motors
GM
$74.1B
| $865K | 0.04% |
8,031
+2,591
| +48% | +$112K |
|
|
LSI
453
DELISTED
Life Storage, Inc.
LSI
| $864K | 0.04% |
14,552
-25,897
| -64% | -$1.49M |
|
|
OPTU
454
Optimum Communications Inc
OPTU
$350M
| $863K | 0.04% |
40,690
+38,935
| +2,219% | +$862K |
|
455
Rio Tinto
RIO
$150B
| $863K | 0.04% |
16,312
+3,162
| +24% | +$154K |
|
456
Live Nation Entertainment
LYV
$41.4B
| $862K | 0.04% |
+20,265
| New | +$882K |
|
|
MLNX
457
DELISTED
Mellanox Technologies, Ltd.
MLNX
| $860K | 0.04% |
13,306
+1,073
| +9% | +$56.7K |
|
458
Hexcel
HXL
$8.04B
| $859K | 0.04% |
13,898
-5,412
| -28% | -$329K |
|
|
X
459
PUT
DELISTED
US Steel
X
| $857K | 0.04% |
7,909
+1,286
| +19% | +$37.4K |
|
460
Electronic Arts
EA
$52.4B
| $853K | 0.04% |
+8,124
| New | +$903K |
|
|
ONCE
461
DELISTED
Spark Therapeutics, Inc. Common Stock
ONCE
| $853K | 0.04% |
+16,596
| New | +$1.19M |
|
462
CALL
SLB Ltd
SLB
$71.3B
| $850K | 0.04% |
3,136
-160
| -5% | -$10.4K |
|
463
MetLife
MET
$60B
| $849K | 0.04% |
+16,795
| New | +$885K |
|
464
NOV
NOV
$7.3B
| $848K | 0.04% |
23,561
+5,877
| +33% | +$199K |
|
465
CALL
Illumina
ILMN
$28.9B
| $845K | 0.04% |
351
+63
| +22% | +$13K |
|
466
PG&E
PCG
$39.9B
| $845K | 0.04% |
+18,864
| New | +$1.06M |
|
467
PUT
NetEase
NTES
$77.6B
| $844K | 0.04% |
4,860
-4,200
| -46% | -$262K |
|
468
Infosys
INFY
$44.3B
| $843K | 0.04% |
104,008
-37,634
| -27% | -$286K |
|
|
P
469
Everpure Inc
P
$24.8B
| $840K | 0.04% |
52,965
+34,821
| +192% | +$580K |
|
470
NCR Voyix
VYX
$1.07B
| $840K | 0.04% |
40,298
+37,459
| +1,319% | +$760K |
|
|
SRCI
471
DELISTED
SRC Energy Inc
SRCI
| $840K | 0.04% |
98,541
+57,961
| +143% | +$511K |
|
472
Ametek
AME
$54.3B
| $838K | 0.04% |
+11,571
| New | +$806K |
|
|
NBIS
473
Nebius Group N.V.
NBIS
$55.4B
| $838K | 0.04% |
25,604
-35,878
| -58% | -$1.17M |
|
474
HSBC
HSBC
$354B
| $835K | 0.04% |
17,709
-3,580
| -17% | -$162K |
|
475
PUT
Merck
MRK
$315B
| $833K | 0.04% |
2,892
+1,286
| +80% | +$71.3K |
|
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.