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 |
Amazon
AMZN
|
+$148M |
| 2 |
Invesco QQQ Trust
QQQ
|
+$67.3M |
| 3 |
Meta Platforms (Facebook)
META
|
+$63.2M |
| 4 |
Goldman Sachs
GS
|
+$23.9M |
| 5 |
Citigroup
C
|
+$23.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Berkshire Hathaway Class B
BRK.B
|
+$47.5M |
| 2 |
Apple
AAPL
|
+$46M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$44.5M |
| 4 |
Micron Technology
MU
|
+$29.1M |
| 5 |
Adobe
ADBE
|
+$22.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 1.13% |
| 2 | Communication Services | 0.89% |
| 3 | Technology | 0.68% |
| 4 | Industrials | 0.51% |
| 5 | Healthcare | 0.44% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2751
Truist Financial
TFC
$63.2B
| $447K | ﹤0.01% |
9,226
-9,873
| -52% | -$507K |
|
2752
CALL
Waters Corp
WAT
$36.8B
| $447K | ﹤0.01% |
23
+15
| +188% | +$2.9K |
|
|
TVRD
2753
Tvardi Therapeutics
TVRD
$23.5M
| $447K | ﹤0.01% |
+519
| New | +$375K |
|
|
VAR
2754
CALL
DELISTED
Varian Medical Systems, Inc.
VAR
| $447K | ﹤0.01% |
40
+5
| +14% | +$566 |
|
2755
CALL
Alliant Energy
LNT
$19.4B
| $446K | ﹤0.01% |
105
+49
| +88% | +$2.1K |
|
2756
CALL
Nice
NICE
$5.29B
| $446K | ﹤0.01% |
39
+35
| +875% | +$3.92K |
|
2757
ProShares UltraShort Bloomberg Crude Oil
SCO
$585M
| $446K | ﹤0.01% |
413
+200
| +94% | +$255K |
|
|
ARNA
2758
CALL
DELISTED
Arena Pharmaceuticals Inc
ARNA
| $446K | ﹤0.01% |
97
-28
| -22% | -$1.14K |
|
|
RP
2759
DELISTED
RealPage, Inc.
RP
| $446K | ﹤0.01% |
6,769
+491
| +8% | +$29.3K |
|
|
IDTI
2760
PUT
DELISTED
Integrated Device Technology I
IDTI
| $446K | ﹤0.01% |
95
+63
| +197% | +$2.43K |
|
2761
CALL
ALPS REIT Dividend Dogs ETF
RDOG
$11.6M
| $445K | ﹤0.01% |
364
+95
| +35% | +$4.2K |
|
|
LSI
2762
DELISTED
Life Storage, Inc.
LSI
| $445K | ﹤0.01% |
7,022
-10,777
| -61% | -$698K |
|
2763
PUT
Rapid7
RPD
$634M
| $443K | ﹤0.01% |
120
+52
| +76% | +$1.75K |
|
2764
PUT
A10 Networks
ATEN
$2.47B
| $442K | ﹤0.01% |
727
+645
| +787% | +$4.36K |
|
2765
Unum
UNM
$13.8B
| $442K | ﹤0.01% |
+11,322
| New | +$422K |
|
|
HSII
2766
DELISTED
Heidrick & Struggles
HSII
| $441K | ﹤0.01% |
13,053
+12,948
| +12,331% | +$504K |
|
2767
Rush Enterprises Class A
RUSHA
$5.95B
| $441K | ﹤0.01% |
25,277
+19,080
| +308% | +$364K |
|
2768
CALL
Arthur J. Gallagher & Co
AJG
$63.7B
| $439K | ﹤0.01% |
59
+33
| +127% | +$2.37K |
|
2769
PUT
Baxter International
BAX
$11.6B
| $439K | ﹤0.01% |
57
+14
| +33% | +$1.04K |
|
2770
BBVA Argentina
BBAR
$3.85B
| $439K | ﹤0.01% |
+37,668
| New | +$428K |
|
|
PYX
2771
PUT
DELISTED
Pyxus International, Inc.
PYX
| $439K | ﹤0.01% |
+191
| New | +$4.41K |
|
2772
AGNC Investment
AGNC
$12.3B
| $438K | ﹤0.01% |
23,541
+18,394
| +357% | +$351K |
|
2773
Herbalife
HLF
$1.23B
| $438K | ﹤0.01% |
8,034
-2,881
| -26% | -$159K |
|
2774
SM Energy
SM
$7.96B
| $438K | ﹤0.01% |
13,912
-4,685
| -25% | -$135K |
|
2775
CALL
AMN Healthcare
AMN
$1.28B
| $437K | ﹤0.01% |
80
+78
| +3,900% | +$4.47K |
|
Similar funds
Simplex Trading's Q3 2018 Portfolio in Review
As of Q3 2018, Simplex Trading held 8,699 positions worth $31.1B, up 22% from $25.5B the previous quarter. Its ten largest holdings account for 34% of the portfolio.
Simplex Trading's Q3 2018 filing shows 1,336 new, 3,066 increased, 2,755 reduced and 1,315 closed positions. Its largest new stake was Invesco QQQ Trust: 371,806 shares worth $69.1M. The largest sale was Berkshire Hathaway Class B, an estimated $47.5M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 1.1% of assets, up from 0.92% a quarter earlier, followed by Communication Services and Technology.
- Simplex Trading's largest Q3 2018 buy was Invesco QQQ Trust: 371,806 shares worth $69.1M.
- Simplex Trading added most to Amazon in Q3 2018, an estimated $148M increase.
- Simplex Trading's biggest Q3 2018 reduction was Apple, cutting an estimated $46M.
- Simplex Trading fully exited Berkshire Hathaway Class B in Q3 2018, selling an estimated $47.5M.
- Simplex Trading's ten largest holdings make up 34% of its $31.1B portfolio in Q3 2018.
- Simplex Trading opened 1,336 new positions and closed 1,315 in Q3 2018.
- Simplex Trading's portfolio value rose 22% quarter-over-quarter to $31.1B.
Based on Simplex Trading's 13F filing for Q3 2018, filed 23 Oct 2018.