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
|
+$58.5M |
| 2 |
Alphabet (Google) Class C
GOOG
|
+$56.5M |
| 3 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$44.1M |
| 4 |
Apple
AAPL
|
+$20.3M |
| 5 |
State Street SPDR S&P Oil & Gas Exploration & Production ETF
XOP
|
+$12.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$109M |
| 2 |
Meta Platforms (Facebook)
META
|
+$62.3M |
| 3 |
Invesco QQQ Trust
QQQ
|
+$36.2M |
| 4 |
Goldman Sachs
GS
|
+$27.1M |
| 5 |
Boeing
BA
|
+$24.7M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 0.49% |
| 2 | Consumer Discretionary | 0.48% |
| 3 | Technology | 0.4% |
| 4 | Financials | 0.25% |
| 5 | Industrials | 0.22% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
551
CALL
Danaher
DHR
$135B
| $5.23M | 0.02% |
572
+90
| +19% | +$8.17K |
|
552
CALL
Fastenal
FAST
$52.4B
| $5.22M | 0.02% |
3,996
+528
| +15% | +$7.14K |
|
553
Baidu
BIDU
$36.3B
| $5.22M | 0.02% |
32,888
-68,828
| -68% | -$12.8M |
|
554
CALL
Marriott International
MAR
$95.7B
| $5.2M | 0.02% |
479
+182
| +61% | +$20.9K |
|
555
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$26.9B
| $5.2M | 0.02% |
17,165
+15,274
| +808% | +$5.08M |
|
556
Workday
WDAY
$31.6B
| $5.19M | 0.02% |
32,494
+15,532
| +92% | +$2.2M |
|
|
TIF
557
CALL
DELISTED
Tiffany & Co.
TIF
| $5.18M | 0.02% |
644
+104
| +19% | +$10.6K |
|
558
CALL
Keurig Dr Pepper
KDP
$40.5B
| $5.17M | 0.02% |
2,017
+1,522
| +307% | +$38.7K |
|
|
IDTI
559
CALL
DELISTED
Integrated Device Technology I
IDTI
| $5.16M | 0.02% |
1,065
-20
| -2% | -$945 |
|
560
CALL
Paycom
PAYC
$6.45B
| $5.16M | 0.02% |
421
+307
| +269% | +$39.3K |
|
|
TRCO
561
CALL
DELISTED
TRIBUNE MEDIA COMPANY CLASS A
TRCO
| $5.16M | 0.02% |
1,136
+1,112
| +4,633% | +$45K |
|
562
PUT
Invesco CurrencyShares Japanese Yen Trust
FXY
$423M
| $5.15M | 0.02% |
591
+208
| +54% | +$17.6K |
|
563
PUT
Restaurant Brands International
QSR
$25.1B
| $5.15M | 0.02% |
984
+186
| +23% | +$10.3K |
|
564
CALL
Incyte
INCY
$23.3B
| $5.14M | 0.02% |
808
+327
| +68% | +$21.2K |
|
565
CALL
BHP
BHP
$212B
| $5.13M | 0.02% |
1,191
+796
| +202% | +$33.4K |
|
566
PUT
ASML
ASML
$691B
| $5.12M | 0.02% |
329
-48
| -13% | -$8.14K |
|
567
PUT
Direxion Daily Technology Bull 3x ETF
TECL
$5.35B
| $5.11M | 0.02% |
15,700
-12,510
| -44% | -$147K |
|
568
CALL
Nutanix
NTNX
$14.2B
| $5.1M | 0.02% |
1,226
+462
| +60% | +$19.1K |
|
569
CALL
Zoetis
ZTS
$31.1B
| $5.05M | 0.01% |
590
+212
| +56% | +$19.1K |
|
570
CALL
Thermo Fisher Scientific
TMO
$213B
| $5.04M | 0.01% |
225
-10
| -4% | -$2.35K |
|
571
CALL
Blackstone
BX
$152B
| $5.03M | 0.01% |
1,689
-98
| -5% | -$3.24K |
|
572
CALL
Kinder Morgan
KMI
$72.4B
| $5.03M | 0.01% |
3,273
+2,265
| +225% | +$38.3K |
|
573
PUT
Rio Tinto
RIO
$149B
| $5.03M | 0.01% |
1,038
| – | – |
|
574
Micron Technology
MU
$1.12T
| $5.03M | 0.01% |
158,503
-121,938
| -43% | -$4.62M |
|
575
Kraft Heinz
KHC
$30B
| $5.03M | 0.01% |
116,786
+54,031
| +86% | +$2.8M |
|
Similar funds
Simplex Trading's Q4 2018 Portfolio in Review
As of Q4 2018, Simplex Trading held 8,576 positions worth $34.1B, up 9.5% from $31.1B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading's Q4 2018 filing shows 1,199 new, 2,701 increased, 2,877 reduced and 1,573 closed positions. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M. The largest sale was Amazon, an estimated $109M.
By sector, the portfolio is most concentrated in Communication Services at 0.49% of assets, down from 0.89% a quarter earlier, followed by Consumer Discretionary and Technology.
- Simplex Trading's largest Q4 2018 buy was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q4 2018, an estimated $58.5M increase.
- Simplex Trading's biggest Q4 2018 reduction was Amazon, cutting an estimated $109M.
- Simplex Trading fully exited Meta Platforms (Facebook) in Q4 2018, selling an estimated $62.3M.
- Simplex Trading's ten largest holdings make up 43% of its $34.1B portfolio in Q4 2018.
- Simplex Trading opened 1,199 new positions and closed 1,573 in Q4 2018.
- Simplex Trading's portfolio value rose 9.5% quarter-over-quarter to $34.1B.
Based on Simplex Trading's 13F filing for Q4 2018, filed 16 Jan 2019.