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 |
State Street Financial Select Sector SPDR ETF
XLF
|
+$42.6M |
| 2 |
Shopify
SHOP
|
+$39.6M |
| 3 |
iShares China Large-Cap ETF
FXI
|
+$35.4M |
| 4 |
Verizon
VZ
|
+$34.1M |
| 5 |
KraneShares CSI China Internet ETF
KWEB
|
+$34.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
AMC Entertainment Holdings
AMC
|
+$49.5M |
| 2 |
GE Aerospace
GE
|
+$35.2M |
| 3 |
Carnival Corporation Ltd
CCL
|
+$30.5M |
| 4 |
Advanced Micro Devices
AMD
|
+$28.8M |
| 5 |
Micron Technology
MU
|
+$23.7M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.61% |
| 2 | Consumer Discretionary | 0.43% |
| 3 | Healthcare | 0.35% |
| 4 | Communication Services | 0.23% |
| 5 | Financials | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1851
CALL
3D Systems Corp
DDD
$420M
| $2.4M | ﹤0.01% |
111,300
-46,400
| -29% | -$1.17M |
|
1852
PUT
Perrigo
PRGO
$1.4B
| $2.4M | ﹤0.01% |
61,600
+45,600
| +285% | +$1.92M |
|
1853
PUT
Molson Coors Class B
TAP
$7.68B
| $2.4M | ﹤0.01% |
51,700
-87,700
| -63% | -$4.02M |
|
1854
CALL
MACOM Technology Solutions
MTSI
$20.4B
| $2.4M | ﹤0.01% |
30,600
+10,200
| +50% | +$736K |
|
|
PACW
1855
PUT
DELISTED
PacWest Bancorp
PACW
| $2.39M | ﹤0.01% |
53,000
+50,600
| +2,108% | +$2.36M |
|
1856
PUT
Shift4
FOUR
$3.84B
| $2.39M | ﹤0.01% |
41,200
+34,600
| +524% | +$2.2M |
|
1857
CALL
The RealReal
REAL
$1.34B
| $2.38M | ﹤0.01% |
205,300
+137,000
| +201% | +$1.8M |
|
1858
CALL
iShares Convertible Bond ETF
ICVT
$7.23B
| $2.38M | ﹤0.01% |
70,700
+31,800
| +82% | +$3.09M |
|
1859
Ventas
VTR
$48.9B
| $2.38M | ﹤0.01% |
46,561
+35,693
| +328% | +$1.87M |
|
1860
CALL
WillScot Mobile Mini Holdings
WSC
$4.8B
| $2.38M | ﹤0.01% |
58,300
+36,000
| +161% | +$1.33M |
|
|
ZH
1861
PUT
Zhihu
ZH
$270M
| $2.38M | ﹤0.01% |
71,617
+29,867
| +72% | +$1.42M |
|
1862
CALL
Cardinal Health
CAH
$53.4B
| $2.38M | ﹤0.01% |
46,200
-13,400
| -22% | -$657K |
|
|
COOP
1863
CALL
DELISTED
Mr. Cooper
COOP
| $2.38M | ﹤0.01% |
57,100
+44,000
| +336% | +$1.85M |
|
1864
PUT
SBA Communications
SBAC
$18.4B
| $2.37M | ﹤0.01% |
6,100
-8,600
| -59% | -$3.02M |
|
|
ZUO
1865
CALL
DELISTED
Zuora, Inc.
ZUO
| $2.37M | ﹤0.01% |
126,700
-17,800
| -12% | -$358K |
|
1866
CALL
Elanco Animal Health
ELAN
$12.4B
| $2.36M | ﹤0.01% |
83,300
+34,700
| +71% | +$1.08M |
|
|
HZNP
1867
DELISTED
Horizon Therapeutics Public Limited Company Ordinary Shares
HZNP
| $2.36M | ﹤0.01% |
21,935
+3,166
| +17% | +$345K |
|
1868
CALL
Peabody Energy
BTU
$2.78B
| $2.36M | ﹤0.01% |
234,300
+141,800
| +153% | +$1.72M |
|
1869
PUT
Mattel
MAT
$4.17B
| $2.36M | ﹤0.01% |
109,400
-43,200
| -28% | -$906K |
|
1870
PUT
Labcorp
LH
$24.3B
| $2.36M | ﹤0.01% |
8,730
-6,751
| -44% | -$1.67M |
|
1871
CALL
Ryanair
RYAAY
$29.5B
| $2.35M | ﹤0.01% |
57,500
+57,250
| +22,900% | +$2.49M |
|
|
ALLK
1872
PUT
DELISTED
Allakos
ALLK
| $2.35M | ﹤0.01% |
240,300
+239,200
| +21,745% | +$19.6M |
|
1873
PUT
Yext
YEXT
$501M
| $2.35M | ﹤0.01% |
236,500
+231,900
| +5,041% | +$2.6M |
|
1874
CALL
Harley-Davidson
HOG
$2.68B
| $2.34M | ﹤0.01% |
62,200
-9,900
| -14% | -$369K |
|
1875
CALL
MPLX
MPLX
$59.5B
| $2.34M | ﹤0.01% |
79,200
+31,100
| +65% | +$932K |
|
Similar funds
Simplex Trading's Q4 2021 Portfolio in Review
As of Q4 2021, Simplex Trading held 12,077 positions worth $99B, down 7.5% from $107B the previous quarter. Its ten largest holdings account for 33% of the portfolio.
Simplex Trading withdrew a net $10.8B in Q4 2021, closing 1,645 positions and reducing 4,258 holdings. Its most notable exit was Carnival Corporation Ltd, an estimated $30.5M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.61% of assets, up from 0.49% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in iShares China Large-Cap ETF worth $33M.
- Simplex Trading's largest Q4 2021 buy was iShares China Large-Cap ETF: 902,666 shares worth $33M.
- Simplex Trading added most to State Street Financial Select Sector SPDR ETF in Q4 2021, an estimated $42.6M increase.
- Simplex Trading's biggest Q4 2021 reduction was AMC Entertainment Holdings, cutting an estimated $49.5M.
- Simplex Trading fully exited Carnival Corporation Ltd in Q4 2021, selling an estimated $30.5M.
- Simplex Trading's ten largest holdings make up 33% of its $99B portfolio in Q4 2021.
- Simplex Trading opened 2,269 new positions and closed 1,645 in Q4 2021.
- Simplex Trading's portfolio value fell 7.5% quarter-over-quarter to $99B.
Based on Simplex Trading's 13F filing for Q4 2021, filed 4 Feb 2022.