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 |
Apple
AAPL
|
+$70.1M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$46.6M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$37.4M |
| 4 |
Amazon
AMZN
|
+$37M |
| 5 |
Tesla
TSLA
|
+$28M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alibaba
BABA
|
+$41M |
| 2 |
Boeing
BA
|
+$27.8M |
| 3 |
Biogen
BIIB
|
+$18.9M |
| 4 |
SPDR Gold Trust
GLD
|
+$18.3M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$13.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.75% |
| 2 | Consumer Discretionary | 0.58% |
| 3 | Communication Services | 0.33% |
| 4 | Healthcare | 0.31% |
| 5 | Industrials | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
526
CALL
MongoDB
MDB
$24.5B
| $8.47M | 0.02% |
644
-562
| -47% | -$73.8K |
|
|
CTXS
527
PUT
DELISTED
Citrix Systems Inc
CTXS
| $8.47M | 0.02% |
764
-204
| -21% | -$22K |
|
528
CALL
AvalonBay Communities
AVB
$27B
| $8.45M | 0.02% |
403
+366
| +989% | +$78.4K |
|
529
Johnson & Johnson
JNJ
$615B
| $8.45M | 0.02% |
57,925
+41,086
| +244% | +$5.57M |
|
530
CALL
Teva Pharmaceuticals
TEVA
$35.1B
| $8.45M | 0.02% |
8,621
+1,683
| +24% | +$15K |
|
531
PUT
Automatic Data Processing
ADP
$97.2B
| $8.44M | 0.02% |
495
+251
| +103% | +$41.6K |
|
532
CALL
Aflac
AFL
$62.9B
| $8.43M | 0.02% |
1,593
+1,107
| +228% | +$58.8K |
|
|
BBBY
533
PUT
DELISTED
Bed Bath & Beyond Inc
BBBY
| $8.43M | 0.02% |
4,871
+2,413
| +98% | +$33.8K |
|
534
PUT
Fortinet
FTNT
$114B
| $8.42M | 0.02% |
3,945
+3,105
| +370% | +$58.4K |
|
|
GRUB
535
CALL
DELISTED
Just Eat Takeaway.com N.V. American Depositary Shares
GRUB
| $8.39M | 0.02% |
863
+279
| +48% | +$25.5K |
|
536
Charter Communications
CHTR
$15.9B
| $8.35M | 0.02% |
17,215
+11,656
| +210% | +$5.36M |
|
537
CALL
Intuit
INTU
$77.8B
| $8.33M | 0.02% |
318
-86
| -21% | -$22.5K |
|
538
CALL
Edwards Lifesciences
EW
$48.6B
| $8.33M | 0.02% |
1,071
-120
| -10% | -$9.37K |
|
539
CALL
Petrobras
PBR
$122B
| $8.32M | 0.02% |
5,222
+934
| +22% | +$14.3K |
|
540
CALL
CoStar Group
CSGP
$11.3B
| $8.32M | 0.02% |
1,390
+1,030
| +286% | +$60.1K |
|
541
PUT
NetEase
NTES
$77.6B
| $8.28M | 0.02% |
1,350
-1,490
| -52% | -$87.3K |
|
542
CALL
Emerson Electric
EMR
$78.2B
| $8.25M | 0.02% |
1,082
-602
| -36% | -$43.4K |
|
543
CALL
iShares MSCI Global Gold Miners ETF
RING
$2.36B
| $8.25M | 0.02% |
1,704
-681
| -29% | -$15.1K |
|
544
CALL
Tyson Foods
TSN
$20.1B
| $8.25M | 0.02% |
906
+96
| +12% | +$8.26K |
|
545
PUT
Kraft Heinz
KHC
$30.8B
| $8.24M | 0.02% |
2,566
-1,513
| -37% | -$45.8K |
|
546
PUT
SolarEdge
SEDG
$2.91B
| $8.2M | 0.02% |
862
+72
| +9% | +$6.16K |
|
547
PUT
F5
FFIV
$22.6B
| $8.17M | 0.02% |
585
+371
| +173% | +$52.3K |
|
548
CALL
Allegiant Air
ALGT
$2.64B
| $8.16M | 0.02% |
469
-47
| -9% | -$7.78K |
|
|
WW
549
PUT
DELISTED
WW International
WW
| $8.15M | 0.02% |
2,132
-628
| -23% | -$23.8K |
|
550
CALL
Zoom
ZM
$25.2B
| $8.14M | 0.02% |
1,197
-405
| -25% | -$27.9K |
|
Similar funds
Simplex Trading's Q4 2019 Portfolio in Review
As of Q4 2019, Simplex Trading held 8,523 positions worth $45.7B, up 30% from $35.2B the previous quarter. Its ten largest holdings account for 39% of the portfolio.
Simplex Trading's Q4 2019 filing shows 1,277 new, 3,072 increased, 2,710 reduced and 1,251 closed positions. Its largest new stake was Apple: 1,090,316 shares worth $80M. The largest sale was Alibaba, an estimated $41M.
By sector, the portfolio is most concentrated in Technology at 0.75% of assets, up from 0.48% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q4 2019 buy was Apple: 1,090,316 shares worth $80M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q4 2019, an estimated $46.6M increase.
- Simplex Trading's biggest Q4 2019 reduction was Alibaba, cutting an estimated $41M.
- Simplex Trading fully exited Boeing in Q4 2019, selling an estimated $27.8M.
- Simplex Trading's ten largest holdings make up 39% of its $45.7B portfolio in Q4 2019.
- Simplex Trading opened 1,277 new positions and closed 1,251 in Q4 2019.
- Simplex Trading's portfolio value rose 30% quarter-over-quarter to $45.7B.
Based on Simplex Trading's 13F filing for Q4 2019, filed 5 Feb 2020.