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 | |
|---|---|---|---|---|---|---|
526
Coherent
COHR
$61.1B
| $731K | 0.03% |
+15,571
| New | +$699K |
|
527
SITE Centers
SITC
$224M
| $729K | 0.03% |
+63,212
| New | +$674K |
|
528
PUT
Electronic Arts
EA
$52.4B
| $728K | 0.03% |
2,745
+1,149
| +72% | +$128K |
|
529
CALL
Texas Instruments
TXN
$268B
| $727K | 0.03% |
1,413
-401
| -22% | -$39K |
|
530
PUT
Boeing
BA
$164B
| $724K | 0.03% |
5,428
-423
| -7% | -$115K |
|
531
PUT
Kraft Heinz
KHC
$30.8B
| $724K | 0.03% |
2,155
+790
| +58% | +$62.1K |
|
532
Acuity Brands
AYI
$9.93B
| $716K | 0.03% |
4,069
+3,158
| +347% | +$525K |
|
533
CALL
Best Buy
BBY
$18.4B
| $713K | 0.03% |
1,081
-494
| -31% | -$29.2K |
|
534
iShares MSCI South Korea ETF
EWY
$22.7B
| $713K | 0.03% |
+9,524
| New | +$704K |
|
535
State Street SPDR S&P Oil & Gas Equipment & Services ETF
XES
$390M
| $713K | 0.03% |
+4,167
| New | +$661K |
|
536
CALL
Five Below
FIVE
$11.3B
| $712K | 0.03% |
501
+55
| +12% | +$3.3K |
|
537
PUT
Goldman Sachs
GS
$324B
| $710K | 0.03% |
3,262
-602
| -16% | -$148K |
|
538
Invesco CurrencyShares Swiss Franc Trust
FXF
$411M
| $709K | 0.03% |
7,332
-1,440
| -16% | -$138K |
|
|
WDR
539
DELISTED
Waddell & Reed Financial, Inc.
WDR
| $707K | 0.03% |
31,660
+24,820
| +363% | +$505K |
|
540
Gaming and Leisure Properties
GLPI
$12.7B
| $706K | 0.03% |
+19,089
| New | +$695K |
|
541
CALL
Applied Materials
AMAT
$440B
| $705K | 0.03% |
2,597
-922
| -26% | -$49.9K |
|
542
Boston Beer
SAM
$1.81B
| $705K | 0.03% |
3,690
+3,272
| +783% | +$585K |
|
|
WBA
543
CALL
DELISTED
Walgreens Boots Alliance
WBA
| $705K | 0.03% |
3,517
+1,573
| +81% | +$111K |
|
|
544
PUT
Citigroup
C
$222B
| $701K | 0.03% |
9,518
+1,256
| +15% | +$92.9K |
|
|
SCG
545
DELISTED
Scana
SCG
| $697K | 0.03% |
17,541
+11,725
| +202% | +$524K |
|
546
PUT
Lam Research
LRCX
$399B
| $696K | 0.03% |
18,430
+8,770
| +91% | +$172K |
|
547
CALL
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$27B
| $696K | 0.03% |
385
+2
| +0.5% | +$674 |
|
|
ACIA
548
DELISTED
Acacia Communications Inc
ACIA
| $696K | 0.03% |
19,212
+16,444
| +594% | +$671K |
|
549
Home BancShares
HOMB
$6.09B
| $695K | 0.03% |
+29,910
| New | +$699K |
|
550
Plains All American Pipeline
PAA
$17.3B
| $693K | 0.03% |
+33,607
| New | +$685K |
|
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.