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 |
AMC Entertainment Holdings
AMC
|
+$39.3M |
| 2 |
AT&T
T
|
+$29.8M |
| 3 |
NVIDIA
NVDA
|
+$28.3M |
| 4 |
Micron Technology
MU
|
+$22.9M |
| 5 |
Baidu
BIDU
|
+$22.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco QQQ Trust
QQQ
|
+$36.1M |
| 2 |
Tesla
TSLA
|
+$35.2M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$25.9M |
| 4 |
Palantir
PLTR
|
+$25.7M |
| 5 |
Wells Fargo
WFC
|
+$20.4M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.47% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.26% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3851
PUT
Vontier
VNT
$4.62B
| $609K | ﹤0.01% |
18,700
+18,121
| +3,130% | +$597K |
|
3852
CALL
Eldorado Gold
EGO
$8.4B
| $608K | ﹤0.01% |
61,200
+59,849
| +4,430% | +$666K |
|
3853
CALL
TE Connectivity
TEL
$62.1B
| $608K | ﹤0.01% |
4,500
+4,478
| +20,355% | +$600K |
|
3854
PUT
AbCellera Biologics
ABCL
$1.62B
| $607K | ﹤0.01% |
27,600
+27,586
| +197,043% | +$761K |
|
3855
Appian
APPN
$2.01B
| $607K | ﹤0.01% |
4,409
+54
| +1% | +$6.13K |
|
3856
PUT
Gerdau
GGB
$9.72B
| $607K | ﹤0.01% |
129,780
+128,738
| +12,355% | +$630K |
|
3857
iShares Global Healthcare ETF
IXJ
$4.18B
| $607K | ﹤0.01% |
7,309
+1,107
| +18% | +$89.5K |
|
3858
PUT
Old Republic International
ORI
$10.8B
| $607K | ﹤0.01% |
+24,400
| New | +$613K |
|
|
VTLE
3859
DELISTED
Vital Energy
VTLE
| $607K | ﹤0.01% |
6,550
-4,913
| -43% | -$253K |
|
|
ORPH
3860
PUT
DELISTED
Orphazyme A/S
ORPH
| $607K | ﹤0.01% |
+82,600
| New | +$666K |
|
3861
Alkermes
ALKS
$8.42B
| $605K | ﹤0.01% |
24,703
-34,371
| -58% | -$765K |
|
3862
PUT
CryoPort
CYRX
$765M
| $605K | ﹤0.01% |
9,600
+9,507
| +10,223% | +$535K |
|
|
3863
CALL
Vontier
VNT
$4.62B
| $605K | ﹤0.01% |
18,600
+17,510
| +1,606% | +$577K |
|
|
VIVO
3864
CALL
DELISTED
Meridian Bioscience Inc
VIVO
| $605K | ﹤0.01% |
27,300
+27,201
| +27,476% | +$577K |
|
|
SCR
3865
DELISTED
Score Media and Gaming Inc. Class A Subordinate Voting Shares
SCR
| $605K | ﹤0.01% |
+30,357
| New | +$573K |
|
3866
CALL
CuriosityStream
CURI
$145M
| $604K | ﹤0.01% |
44,300
+44,068
| +18,995% | +$569K |
|
3867
Neurocrine Biosciences
NBIX
$18.4B
| $604K | ﹤0.01% |
+6,209
| New | +$595K |
|
|
NIU
3868
PUT
Niu Technologies
NIU
$208M
| $604K | ﹤0.01% |
18,500
+18,349
| +12,152% | +$612K |
|
3869
CALL
Robert Half
RHI
$4.04B
| $604K | ﹤0.01% |
6,800
+6,754
| +14,683% | +$589K |
|
3870
Adient
ADNT
$1.7B
| $603K | ﹤0.01% |
13,341
+8,018
| +151% | +$375K |
|
3871
Equifax
EFX
$22B
| $603K | ﹤0.01% |
2,520
-1,222
| -33% | -$273K |
|
|
GSKY
3872
DELISTED
GreenSky, Inc. Class A Common Stock
GSKY
| $603K | ﹤0.01% |
108,823
+88,823
| +444% | +$532K |
|
3873
PUT
Natural Resource Partners
NRP
$1.32B
| $602K | ﹤0.01% |
28,400
+28,397
| +946,567% | +$529K |
|
|
SGMO
3874
CALL
DELISTED
SANGAMO THERAPEUTICS INC
SGMO
| $602K | ﹤0.01% |
+50,300
| New | +$570K |
|
|
WWE
3875
PUT
DELISTED
World Wrestling Entertainment
WWE
| $602K | ﹤0.01% |
10,400
+10,264
| +7,547% | +$583K |
|
Similar funds
Simplex Trading's Q2 2021 Portfolio in Review
As of Q2 2021, Simplex Trading held 11,184 positions worth $104B, up 86% from $55.7B the previous quarter. Its ten largest holdings account for 40% of the portfolio.
Simplex Trading deployed $97.5B of net new capital in Q2 2021, opening 2,250 new positions and adding to 6,673 existing holdings. Its largest new stake was AT&T: 1,311,180 shares worth $28.5M.
By sector, the portfolio is most concentrated in Technology at 0.47% of assets, down from 0.65% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, an estimated $25.9M trimmed.
- Simplex Trading's largest Q2 2021 buy was AT&T: 1,311,180 shares worth $28.5M.
- Simplex Trading added most to AMC Entertainment Holdings in Q2 2021, an estimated $39.3M increase.
- Simplex Trading's biggest Q2 2021 reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, cutting an estimated $25.9M.
- Simplex Trading fully exited Invesco QQQ Trust in Q2 2021, selling an estimated $36.1M.
- Simplex Trading's ten largest holdings make up 40% of its $104B portfolio in Q2 2021.
- Simplex Trading opened 2,250 new positions and closed 1,197 in Q2 2021.
- Simplex Trading's portfolio value rose 86% quarter-over-quarter to $104B.
Based on Simplex Trading's 13F filing for Q2 2021, filed 12 Aug 2021.