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 |
Microsoft
MSFT
|
+$234M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$97.5M |
| 3 |
Amazon
AMZN
|
+$96.8M |
| 4 |
iShares Bitcoin Trust
IBIT
|
+$80.6M |
| 5 |
Pinduoduo
PDD
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$129M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$92.9M |
| 3 |
Broadcom
AVGO
|
+$82.9M |
| 4 |
Alphabet (Google) Class C
GOOG
|
+$68.4M |
| 5 |
Meta Platforms (Facebook)
META
|
+$59.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.79% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Healthcare | 0.25% |
| 4 | Financials | 0.17% |
| 5 | Industrials | 0.09% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
801
PUT
Zillow
Z
$6.77B
| $13.4M | 0.01% |
174,200
+29,100
| +20% | +$2.38M |
|
|
METD
802
CALL
Direxion Daily META Bear 1X ETF
METD
$8.38M
| $13.4M | 0.01% |
483,000
+142,100
| +42% | +$2.06M |
|
803
PUT
Fluor
FLR
$7.44B
| $13.4M | 0.01% |
317,800
+174,200
| +121% | +$8.02M |
|
804
CALL
CRISPR Therapeutics
CRSP
$4.68B
| $13.4M | 0.01% |
206,100
+8,300
| +4% | +$477K |
|
805
CALL
Blue Owl Capital
OWL
$6.22B
| $13.3M | 0.01% |
786,600
+159,800
| +25% | +$3.04M |
|
806
CALL
ProShares Ultra S&P500
SSO
$7.82B
| $13.3M | 0.01% |
226,600
+19,200
| +9% | +$1M |
|
807
PUT
Linde
LIN
$234B
| $13.3M | 0.01% |
28,000
-6,500
| -19% | -$3.08M |
|
808
CALL
Liquidia Corp
LQDA
$7.92B
| $13.3M | 0.01% |
584,200
+341,100
| +140% | +$7.4M |
|
809
Global X Uranium ETF
URA
$5.69B
| $13.3M | 0.01% |
278,475
-26,102
| -9% | -$1.08M |
|
|
PSKY
810
PUT
Paramount Skydance Corp
PSKY
$9.5B
| $13.3M | 0.01% |
+701,500
| New | +$11.1M |
|
811
CALL
Nextpower Inc
NXT
$15.8B
| $13.3M | 0.01% |
179,100
+47,700
| +36% | +$3.07M |
|
812
PUT
UBS Group
UBS
$169B
| $13.2M | 0.01% |
323,000
+170,600
| +112% | +$6.63M |
|
813
CALL
Cencora
COR
$59.4B
| $13.2M | 0.01% |
42,300
-17,800
| -30% | -$5.24M |
|
814
CALL
Brinker International
EAT
$7.93B
| $13.1M | 0.01% |
103,500
+48,000
| +86% | +$7.49M |
|
815
CALL
Norwegian Cruise Line
NCLH
$8.59B
| $13.1M | 0.01% |
531,200
-72,000
| -12% | -$1.75M |
|
816
CALL
Intercontinental Exchange
ICE
$81B
| $13M | 0.01% |
77,200
+14,800
| +24% | +$2.64M |
|
817
CALL
RH
RH
$3.14B
| $13M | 0.01% |
63,900
-68,900
| -52% | -$15M |
|
818
PUT
DexCom
DXCM
$27.2B
| $13M | 0.01% |
192,700
-137,500
| -42% | -$10.9M |
|
819
CALL
Aflac
AFL
$63.3B
| $13M | 0.01% |
116,000
+7,300
| +7% | +$767K |
|
820
PUT
Coherent
COHR
$61.3B
| $12.9M | 0.01% |
119,900
-9,600
| -7% | -$957K |
|
|
821
CALL
Coherent
COHR
$61.3B
| $12.9M | 0.01% |
119,500
-55,600
| -32% | -$5.54M |
|
822
PUT
American Conservative Values ETF
ACVF
$149M
| $12.9M | 0.01% |
825,000
+318,500
| +63% | +$15.4M |
|
823
PUT
Crocs
CROX
$6.58B
| $12.9M | 0.01% |
154,000
+75,300
| +96% | +$6.87M |
|
824
PUT
Prudential Financial
PRU
$40.9B
| $12.8M | 0.01% |
123,800
+42,200
| +52% | +$4.44M |
|
825
Sharplink Inc
SBET
$1.26B
| $12.8M | 0.01% |
754,688
+715,080
| +1,805% | +$14M |
|
Similar funds
Simplex Trading's Q3 2025 Portfolio in Review
As of Q3 2025, Simplex Trading held 10,358 positions worth $195B, up 12% from $175B the previous quarter. Its ten largest holdings account for 46% of the portfolio.
Simplex Trading's Q3 2025 filing shows 1,743 new, 3,828 increased, 3,250 reduced and 1,308 closed positions. Its largest new stake was Microsoft: 458,309 shares worth $237M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $129M.
By sector, the portfolio is most concentrated in Technology at 0.79% of assets, up from 0.74% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2025 buy was Microsoft: 458,309 shares worth $237M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q3 2025, an estimated $97.5M increase.
- Simplex Trading's biggest Q3 2025 reduction was Alphabet (Google) Class A, cutting an estimated $92.9M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q3 2025, selling an estimated $129M.
- Simplex Trading's ten largest holdings make up 46% of its $195B portfolio in Q3 2025.
- Simplex Trading opened 1,743 new positions and closed 1,308 in Q3 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $195B.
Based on Simplex Trading's 13F filing for Q3 2025, filed 12 Nov 2025.