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 | |
|---|---|---|---|---|---|---|
426
PUT
Blackstone
BX
$102B
| $25.3M | 0.03% |
195,500
-13,600
| -7% | -$1.81M |
|
427
CALL
Accenture
ACN
$114B
| $25.1M | 0.03% |
60,600
-10,700
| -15% | -$3.9M |
|
428
CALL
T-Mobile US
TMUS
$195B
| $25.1M | 0.03% |
219,600
+134,600
| +158% | +$15.8M |
|
|
ZEN
429
PUT
DELISTED
ZENDESK INC
ZEN
| $25.1M | 0.03% |
240,600
+196,800
| +449% | +$21.1M |
|
430
CALL
Capital One
COF
$135B
| $25M | 0.03% |
172,200
+34,600
| +25% | +$5.35M |
|
|
EA
431
CALL
DELISTED
Electronic Arts
EA
| $25M | 0.03% |
189,400
+6,800
| +4% | +$915K |
|
432
CALL
Autodesk
ADSK
$45.5B
| $24.9M | 0.03% |
88,600
+28,000
| +46% | +$8.16M |
|
433
PUT
Avis
CAR
$4.9B
| $24.9M | 0.03% |
120,000
+15,700
| +15% | +$3.48M |
|
434
Salesforce
CRM
$213B
| $24.9M | 0.03% |
97,902
+97,852
| +195,704% | +$27.5M |
|
435
PUT
Northrop Grumman
NOC
$73.2B
| $24.8M | 0.03% |
64,000
+42,600
| +199% | +$15.9M |
|
436
Medtronic
MDT
$120B
| $24.7M | 0.02% |
+238,800
| New | +$27.7M |
|
437
PUT
PNC Financial Services
PNC
$98B
| $24.6M | 0.02% |
122,500
-3,400
| -3% | -$692K |
|
438
PUT
XPeng
XPEV
$10.5B
| $24.5M | 0.02% |
487,300
-313,600
| -39% | -$14.1M |
|
439
PUT
Atlassian
TEAM
$48B
| $24.4M | 0.02% |
64,000
+5,200
| +9% | +$2.09M |
|
440
PUT
Invesco Aerospace & Defense ETF
PPA
$7.91B
| $24.4M | 0.02% |
195,300
+120,100
| +160% | +$8.72M |
|
441
CALL
Amgen
AMGN
$236B
| $24.2M | 0.02% |
107,600
+600
| +0.6% | +$127K |
|
442
PUT
Align Technology
ALGN
$11.3B
| $24.2M | 0.02% |
36,800
+13,000
| +55% | +$8.36M |
|
443
PUT
Wayfair
W
$13.6B
| $24M | 0.02% |
126,300
+6,800
| +6% | +$1.6M |
|
444
Delta Air Lines
DAL
$52.7B
| $24M | 0.02% |
613,894
+330,028
| +116% | +$13.2M |
|
445
CALL
Honeywell
HON
$66.4B
| $24M | 0.02% |
122,015
+60,901
| +100% | +$12.3M |
|
446
UnitedHealth
UNH
$356B
| $23.9M | 0.02% |
+47,558
| New | +$21.5M |
|
447
Lam Research
LRCX
$385B
| $23.7M | 0.02% |
328,990
+252,400
| +330% | +$15.8M |
|
448
PUT
NetEase
NTES
$76.4B
| $23.4M | 0.02% |
230,400
+137,200
| +147% | +$13.9M |
|
449
PUT
ConocoPhillips
COP
$161B
| $23.3M | 0.02% |
322,600
-63,800
| -17% | -$4.65M |
|
450
CALL
Spotify
SPOT
$112B
| $23.3M | 0.02% |
99,400
-2,000
| -2% | -$500K |
|
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.