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 | |
|---|---|---|---|---|---|---|
4876
State Street Consumer Staples Select Sector SPDR ETF
XLP
$14.6B
| $212K | ﹤0.01% |
2,708
-14,727
| -84% | -$1.19M |
|
4877
PUT
Atomera
ATOM
$173M
| $211K | ﹤0.01% |
47,800
-30,400
| -39% | -$125K |
|
4878
PUT
Cellebrite
CLBT
$3.76B
| $211K | ﹤0.01% |
11,400
+7,800
| +217% | +$123K |
|
4879
Kodak
KODK
$809M
| $211K | ﹤0.01% |
32,919
-284,932
| -90% | -$1.79M |
|
4880
PUT
Reinsurance Group of America
RGA
$15.5B
| $211K | ﹤0.01% |
1,100
+200
| +22% | +$38.3K |
|
4881
PUT
Telephone and Data Systems
TDS
$3.87B
| $211K | ﹤0.01% |
5,400
-4,800
| -47% | -$185K |
|
4882
Direxion Daily 7-10 Year Treasury Bull 3X ETF
TYD
$31.9M
| $211K | ﹤0.01% |
8,229
+2,950
| +56% | +$74.7K |
|
|
SLON
4883
ProShares Ultra Solana ETF
SLON
$16.1M
| $211K | ﹤0.01% |
+818
| New | +$210K |
|
|
AL
4884
DELISTED
Air Lease Corp
AL
| $210K | ﹤0.01% |
3,312
-97,756
| -97% | -$5.84M |
|
4885
PUT
GH Research
GHRS
$1.92B
| $210K | ﹤0.01% |
+14,700
| New | +$206K |
|
4886
PUT
HUB Group
HUBG
$2.92B
| $210K | ﹤0.01% |
6,100
-17,400
| -74% | -$621K |
|
4887
Tradr 1.25X NVDA Bear Daily ETF
NVDS
$17.4M
| $210K | ﹤0.01% |
6,320
+1,474
| +30% | +$54.9K |
|
4888
PUT
Palomar
PLMR
$3.79B
| $210K | ﹤0.01% |
1,800
| – | – |
|
4889
CALL
Sally Beauty Holdings
SBH
$1.47B
| $210K | ﹤0.01% |
12,900
+8,000
| +163% | +$101K |
|
4890
PUT
SiTime
SITM
$13.8B
| $210K | ﹤0.01% |
700
| – | – |
|
|
JOYY
4891
JOYY Inc
JOYY
$3.73B
| $210K | ﹤0.01% |
3,595
+1,824
| +103% | +$100K |
|
4892
CALL
GATX Corp
GATX
$6.45B
| $209K | ﹤0.01% |
+1,200
| New | +$194K |
|
4893
nLIGHT
LASR
$3.33B
| $209K | ﹤0.01% |
+7,079
| New | +$176K |
|
4894
PUT
Odyssey Marine Exploration
OMEX
$37.7M
| $209K | ﹤0.01% |
107,300
+85,000
| +381% | +$137K |
|
4895
RxSight
RXST
$254M
| $209K | ﹤0.01% |
+23,354
| New | +$205K |
|
4896
AMN Healthcare
AMN
$1.35B
| $208K | ﹤0.01% |
+10,790
| New | +$211K |
|
4897
PUT
Vertical Aerospace
EVTL
$154M
| $208K | ﹤0.01% |
40,100
+35,200
| +718% | +$196K |
|
4898
CALL
Liberty Global Class C
LBTYK
$3.5B
| $208K | ﹤0.01% |
18,200
-99,900
| -85% | -$1.12M |
|
4899
PUT
Sabre
SABR
$716M
| $208K | ﹤0.01% |
114,000
-65,500
| -36% | -$154K |
|
4900
PUT
Zevra Therapeutics
ZVRA
$578M
| $208K | ﹤0.01% |
21,900
+6,200
| +39% | +$62.2K |
|
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.