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 |
Alibaba
BABA
|
+$50.3M |
| 2 |
Boeing
BA
|
+$24.3M |
| 3 |
SPDR Gold Trust
GLD
|
+$18.3M |
| 4 |
Biogen
BIIB
|
+$15.9M |
| 5 |
FedEx
FDX
|
+$15.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class C
GOOG
|
+$60.3M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$36.4M |
| 3 |
Netflix
NFLX
|
+$19M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$17.3M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$14.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 0.49% |
| 2 | Technology | 0.48% |
| 3 | Healthcare | 0.35% |
| 4 | Industrials | 0.35% |
| 5 | Communication Services | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1626
CALL
Post Holdings
POST
$4.12B
| $1.41M | ﹤0.01% |
203
+52
| +34% | +$3.54K |
|
1627
Check Point Software Technologies
CHKP
$13.3B
| $1.4M | ﹤0.01% |
12,828
+10,579
| +470% | +$1.18M |
|
1628
CrowdStrike
CRWD
$187B
| $1.4M | ﹤0.01% |
96,360
+22,904
| +31% | +$455K |
|
|
BECN
1629
PUT
DELISTED
Beacon Roofing Supply, Inc.
BECN
| $1.4M | ﹤0.01% |
418
+357
| +585% | +$12.1K |
|
1630
PUT
Hartford Financial Services
HIG
$38.5B
| $1.4M | ﹤0.01% |
231
+86
| +59% | +$5.03K |
|
1631
CALL
Regenxbio
RGNX
$623M
| $1.4M | ﹤0.01% |
393
+252
| +179% | +$10.2K |
|
1632
CALL
Prologis
PLD
$138B
| $1.4M | ﹤0.01% |
164
+117
| +249% | +$9.68K |
|
1633
CALL
US Foods
USFD
$21.4B
| $1.4M | ﹤0.01% |
340
+275
| +423% | +$10.6K |
|
1634
CALL
Masco
MAS
$16B
| $1.4M | ﹤0.01% |
335
-217
| -39% | -$8.7K |
|
|
ACIA
1635
DELISTED
Acacia Communications Inc
ACIA
| $1.4M | ﹤0.01% |
+21,355
| New | +$1.35M |
|
1636
PUT
Chemours
CC
$2.59B
| $1.4M | ﹤0.01% |
934
+471
| +102% | +$7.66K |
|
1637
CALL
Goodyear
GT
$2.07B
| $1.39M | ﹤0.01% |
968
+245
| +34% | +$3.26K |
|
|
MPT
1638
Medical Properties Trust
MPT
$2.89B
| $1.39M | ﹤0.01% |
71,296
+37,545
| +111% | +$690K |
|
1639
PUT
ON Semiconductor
ON
$33.8B
| $1.39M | ﹤0.01% |
726
+266
| +58% | +$5.12K |
|
1640
Nexstar Media Group
NXST
$5.6B
| $1.39M | ﹤0.01% |
13,616
+9,456
| +227% | +$957K |
|
1641
CALL
uniQure
QURE
$2.68B
| $1.39M | ﹤0.01% |
354
+270
| +321% | +$15.6K |
|
|
SPR
1642
PUT
DELISTED
Spirit AeroSystems
SPR
| $1.39M | ﹤0.01% |
169
-447
| -73% | -$35K |
|
|
1643
CALL
ON Semiconductor
ON
$33.8B
| $1.39M | ﹤0.01% |
723
+215
| +42% | +$4.13K |
|
1644
PUT
Trupanion
TRUP
$1.05B
| $1.39M | ﹤0.01% |
545
-88
| -14% | -$2.58K |
|
1645
Aecom
ACM
$9.07B
| $1.38M | ﹤0.01% |
+36,866
| New | +$1.33M |
|
1646
PUT
Freshpet
FRPT
$2.83B
| $1.38M | ﹤0.01% |
278
-113
| -29% | -$5.16K |
|
1647
International Flavors & Fragrances
IFF
$19.4B
| $1.38M | ﹤0.01% |
+11,278
| New | +$1.44M |
|
|
BRFS
1648
CALL
DELISTED
BRF SA
BRFS
| $1.38M | ﹤0.01% |
1,509
+1,132
| +300% | +$10.3K |
|
1649
CALL
First Trust Natural Gas ETF
FCG
$632M
| $1.38M | ﹤0.01% |
103
+83
| +415% | +$1.02K |
|
1650
CALL
Cedar Fair
FUN
$1.78B
| $1.38M | ﹤0.01% |
236
+228
| +2,850% | +$12K |
|
Similar funds
Simplex Trading's Q3 2019 Portfolio in Review
As of Q3 2019, Simplex Trading held 8,410 positions worth $35.2B, down 4.1% from $36.6B the previous quarter. Its ten largest holdings account for 33% of the portfolio.
Simplex Trading's Q3 2019 filing shows 1,312 new, 3,129 increased, 2,596 reduced and 1,163 closed positions. Its largest new stake was SPDR Gold Trust: 131,281 shares worth $18.2M. The largest sale was Alphabet (Google) Class C, an estimated $60.3M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 0.49% of assets, up from 0.26% a quarter earlier, followed by Technology and Healthcare.
- Simplex Trading's largest Q3 2019 buy was SPDR Gold Trust: 131,281 shares worth $18.2M.
- Simplex Trading added most to Alibaba in Q3 2019, an estimated $50.3M increase.
- Simplex Trading's biggest Q3 2019 reduction was Alphabet (Google) Class C, cutting an estimated $60.3M.
- Simplex Trading fully exited iShares Russell 2000 ETF in Q3 2019, selling an estimated $36.4M.
- Simplex Trading's ten largest holdings make up 33% of its $35.2B portfolio in Q3 2019.
- Simplex Trading opened 1,312 new positions and closed 1,163 in Q3 2019.
- Simplex Trading's portfolio value fell 4.1% quarter-over-quarter to $35.2B.
Based on Simplex Trading's 13F filing for Q3 2019, filed 15 Oct 2019.