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 | |
|---|---|---|---|---|---|---|
1901
Clean Harbors
CLH
$16.1B
| $988K | ﹤0.01% |
13,810
+5,070
| +58% | +$322K |
|
1902
CALL
UBS Group
UBS
$170B
| $987K | ﹤0.01% |
628
+626
| +31,300% | +$9.84K |
|
1903
PUT
Dick's Sporting Goods
DKS
$18.4B
| $986K | ﹤0.01% |
278
-253
| -48% | -$9.07K |
|
|
CRAY
1904
PUT
DELISTED
Cray, Inc.
CRAY
| $986K | ﹤0.01% |
459
+451
| +5,638% | +$10.4K |
|
1905
CALL
Chord Energy
CHRD
$7.79B
| $984K | ﹤0.01% |
694
+367
| +112% | +$4.65K |
|
|
BPMC
1906
PUT
DELISTED
Blueprint Medicines
BPMC
| $983K | ﹤0.01% |
126
-107
| -46% | -$7.44K |
|
1907
PUT
Lexicon Pharmaceuticals
LXRX
$1.02B
| $983K | ﹤0.01% |
922
+366
| +66% | +$4.19K |
|
|
EVA
1908
CALL
DELISTED
Enviva Inc.
EVA
| $982K | ﹤0.01% |
309
-18
| -6% | -$551 |
|
1909
CALL
AGNC Investment
AGNC
$12.3B
| $981K | ﹤0.01% |
527
+485
| +1,155% | +$9.25K |
|
1910
PUT
L3Harris
LHX
$55.9B
| $981K | ﹤0.01% |
58
-41
| -41% | -$6.52K |
|
1911
CALL
TG Therapeutics
TGTX
$8.58B
| $980K | ﹤0.01% |
1,750
+637
| +57% | +$7.28K |
|
1912
PUT
LivaNova
LIVN
$4.3B
| $979K | ﹤0.01% |
79
-23
| -23% | -$2.71K |
|
|
FARO
1913
PUT
DELISTED
Faro Technologies
FARO
| $978K | ﹤0.01% |
152
| – | – |
|
|
SRG
1914
CALL
Seritage Growth Properties
SRG
$130M
| $978K | ﹤0.01% |
206
-79
| -28% | -$3.74K |
|
1915
CALL
Norwegian Cruise Line
NCLH
$8.89B
| $976K | ﹤0.01% |
170
+42
| +33% | +$2.17K |
|
1916
PUT
CACI
CACI
$10.8B
| $975K | ﹤0.01% |
53
+50
| +1,667% | +$9.23K |
|
1917
AMC Entertainment Holdings
AMC
$2.03B
| $974K | ﹤0.01% |
4,753
+909
| +24% | +$164K |
|
1918
Planet Fitness
PLNT
$4.23B
| $974K | ﹤0.01% |
+18,043
| New | +$896K |
|
1919
CALL
Deckers Outdoor
DECK
$13.3B
| $972K | ﹤0.01% |
492
-138
| -22% | -$2.68K |
|
1920
Tyson Foods
TSN
$20.2B
| $972K | ﹤0.01% |
+16,338
| New | +$1.02M |
|
|
SIR
1921
PUT
DELISTED
SELECT INCOME REIT
SIR
| $971K | ﹤0.01% |
1,008
+978
| +3,260% | +$9.2K |
|
1922
CALL
Edgewell Personal Care
EPC
$1.27B
| $970K | ﹤0.01% |
210
+190
| +950% | +$10.1K |
|
1923
PUT
Iron Mountain
IRM
$38.2B
| $970K | ﹤0.01% |
281
+152
| +118% | +$5.42K |
|
1924
PUT
Energous
WATT
$80.3M
| $970K | ﹤0.01% |
2
+1
| +100% | +$7.76K |
|
|
NEWR
1925
CALL
DELISTED
New Relic, Inc.
NEWR
| $970K | ﹤0.01% |
103
+86
| +506% | +$8.91K |
|
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.