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 | Miscellaneous | 97.43% |
| 2 | Technology | 0.63% |
| 3 | Consumer Discretionary | 0.43% |
| 4 | Healthcare | 0.36% |
| 5 | Communication Services | 0.23% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
826
State Street Energy Select Sector SPDR ETF
XLE
$42.2B
| $9.08M | 0.01% |
327,258
+182,348
| +126% | +$5.15M |
|
827
CALL
Cadence Design Systems
CDNS
$80.6B
| $9.07M | 0.01% |
48,700
+13,000
| +36% | +$2.27M |
|
828
PUT
Paycom
PAYC
$10.4B
| $9.05M | 0.01% |
21,800
-1,700
| -7% | -$805K |
|
829
PUT
Baxter International
BAX
$13.4B
| $9.05M | 0.01% |
105,400
+70,100
| +199% | +$5.64M |
|
830
VanEck Oil Services ETF
OIH
$2.1B
| $9.04M | 0.01% |
48,886
-986
| -2% | -$199K |
|
831
PUT
Bausch Health
BHC
$2.45B
| $9.03M | 0.01% |
326,900
+12,900
| +4% | +$345K |
|
|
PXD
832
CALL
DELISTED
Pioneer Natural Resource Co.
PXD
| $9.02M | 0.01% |
49,600
-75,700
| -60% | -$13.9M |
|
833
CALL
PG&E
PCG
$31.5B
| $9.02M | 0.01% |
742,700
+443,700
| +148% | +$5.2M |
|
834
CALL
Cenovus Energy
CVE
$59.7B
| $8.97M | 0.01% |
730,600
+481,100
| +193% | +$5.76M |
|
835
PUT
Fiverr
FVRR
$333M
| $8.97M | 0.01% |
78,900
+1,300
| +2% | +$203K |
|
|
ATVI
836
DELISTED
Activision Blizzard
ATVI
| $8.97M | 0.01% |
134,793
+61,349
| +84% | +$4.19M |
|
837
PUT
Dominion Energy
D
$57.9B
| $8.96M | 0.01% |
114,100
+59,100
| +107% | +$4.45M |
|
|
HIMX
838
CALL
Himax Technologies
HIMX
$2.39B
| $8.94M | 0.01% |
559,200
+286,900
| +105% | +$3.14M |
|
839
PUT
Ventas
VTR
$46.3B
| $8.94M | 0.01% |
174,900
+75,300
| +76% | +$3.93M |
|
840
Costco
COST
$406B
| $8.93M | 0.01% |
15,732
+7,793
| +98% | +$3.99M |
|
841
PUT
McKesson
MCK
$106B
| $8.92M | 0.01% |
35,900
+2,900
| +9% | +$637K |
|
842
CALL
Phillips 66
PSX
$102B
| $8.92M | 0.01% |
123,100
+4,700
| +4% | +$355K |
|
843
PUT
Ciena
CIEN
$45.5B
| $8.91M | 0.01% |
115,800
+26,800
| +30% | +$1.65M |
|
844
PUT
Progressive
PGR
$127B
| $8.91M | 0.01% |
86,800
+6,200
| +8% | +$592K |
|
845
PUT
Builders FirstSource
BLDR
$7.08B
| $8.9M | 0.01% |
103,800
-36,900
| -26% | -$2.5M |
|
846
Marriott International
MAR
$87.8B
| $8.88M | 0.01% |
53,716
-12,822
| -19% | -$2.02M |
|
|
847
CALL
Paycom
PAYC
$10.4B
| $8.84M | 0.01% |
21,300
-10,400
| -33% | -$4.92M |
|
848
Netflix
NFLX
$326B
| $8.84M | 0.01% |
146,710
+146,010
| +20,859% | +$9.33M |
|
849
Fortinet
FTNT
$115B
| $8.84M | 0.01% |
122,945
+106,075
| +629% | +$6.98M |
|
850
CALL
Centene
CNC
$33.1B
| $8.83M | 0.01% |
107,200
+67,000
| +167% | +$4.91M |
|
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's Q4 2021 filing shows 2,268 new, 3,786 increased, 4,257 reduced and 1,643 closed positions. Its largest new stake was iShares China Large-Cap ETF: 902,666 shares worth $33M. The largest sale was AMC Entertainment Holdings, an estimated $49.5M.
By sector, the portfolio is most concentrated in Miscellaneous at 97% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- 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 2,268 new positions and closed 1,643 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.