We are live on !
Find out more
Simplex Trading Portfolio holdings
AUM
$184B
Turnover
28.44%
1-Year Est. Return
51.71%
Simplex Trading is a market maker that trades for its own account, mainly in US stock options and options on futures, using software it builds itself. Its work pairs software developers with data-driven traders. It was founded in Chicago in 2004, and Erik Swanson, who joined straight out of college as a trader, has been its chief executive since 2014. It also invests in early-stage financial and technology start-ups.
This Fund
S&P 500
This Quarter Est. Return
-0.22%
1 Year Est. Return
+51.71%
3 Year Est. Return
+194.66%
5 Year Est. Return
+164.83%
10 Year Est. Return
+968.67%
AUM
$184B
AUM Growth
+$13.3B
(+7.8%)
Cap. Flow
-$519M
Cap. Flow % of AUM
Cap. Flow %
-0.28%
Top 10 Holdings %
Top 10 Hldgs %
50.68%
Holding
10,644
New
1,493
Increased
3,697
Reduced
3,633
Closed
1,534
Avg Time Held
Equity + Options
3
years
Top 10 Avg Time Held
Equity + Options
3.9
years
Top 20 Avg Time Held
Equity + Options
4.3
years
Avg Time Held Equity only
0.5
years
Top 10 Avg Time Held Equity only
0.5
years
Top 20 Avg Time Held Equity only
0.4
years
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$92.6M |
| 2 |
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
|
+$80.6M |
| 3 |
Amazon
AMZN
|
+$26.3M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$25.7M |
| 5 |
SPDR Gold Trust
GLD
|
+$20.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class A
GOOGL
|
+$128M |
| 2 |
NVIDIA
NVDA
|
+$97.8M |
| 3 |
Tesla
TSLA
|
+$53.9M |
| 4 |
Micron Technology
MU
|
+$50M |
| 5 |
United States Oil Fund
USO
|
+$49.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.84% |
| 2 | Technology | 0.45% |
| 3 | Consumer Discretionary | 0.14% |
| 4 | Healthcare | 0.14% |
| 5 | Financials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
3851
ChargePoint
CHPT
$310M
| $392K | ﹤0.01% |
38,926
+26,319
| +209% | +$180K |
2024 Q1
10 quarters
|
|
3852
PUT
M&T Bank
MTB
$31.5B
| $392K | ﹤0.01% |
1,800
-500
| -22% | -$120K |
2014 Q4
47 quarters
|
|
3853
Algoma Steel
ASTL
$587M
| $391K | ﹤0.01% |
93,795
-31,930
| -25% | -$133K |
2025 Q4
3 quarters
|
|
3854
PUT
2x Solana ETF
SOLT
$103M
| $391K | ﹤0.01% |
7,600
-4,100
| -35% | -$192K |
2026 Q1
2 quarters
|
|
3855
CALL
Marex Group Limited Ordinary Shares
MRX
$5.14B
| $391K | ﹤0.01% |
5,600
-7,500
| -57% | -$516K |
2025 Q1
6 quarters
|
|
3856
CALL
CG Oncology
CGON
$6.25B
| $390K | ﹤0.01% |
5,500
-9,200
| -63% | -$676K |
2024 Q3
8 quarters
|
|
3857
PUT
Perma-Fix Environmental Services
PESI
$313M
| $390K | ﹤0.01% |
24,900
+21,900
| +730% | +$368K |
2026 Q1
2 quarters
|
|
3858
Liquidia Corp
LQDA
$5.25B
| $390K | ﹤0.01% |
+12,876
| New | +$969K |
2026 Q3
0 quarters
|
|
3859
Stride
LRN
$3.19B
| $389K | ﹤0.01% |
4,986
-365
| -7% | -$30.8K |
2025 Q4
3 quarters
|
|
3860
CALL
York Space Systems
YSS
$754M
| $388K | ﹤0.01% |
44,900
+22,800
| +103% | +$296K |
2026 Q1
2 quarters
|
|
3861
Genworth Financial
GNW
$3.06B
| $388K | ﹤0.01% |
+43,285
| New | +$428K |
2026 Q3
0 quarters
|
|
3862
CALL
Teekay Tankers
TNK
$3.11B
| $388K | ﹤0.01% |
4,000
+2,800
| +233% | +$236K |
2026 Q1
2 quarters
|
|
3863
PUT
Insmed
INSM
$25.8B
| $388K | ﹤0.01% |
3,400
-12,100
| -78% | -$1.43M |
2020 Q1
26 quarters
|
|
3864
PUT
eToro Group
ETOR
$1.76B
| $388K | ﹤0.01% |
15,100
+8,700
| +136% | +$286K |
2025 Q2
5 quarters
|
|
3865
CALL
Progyny
PGNY
$2.69B
| $388K | ﹤0.01% |
15,400
+11,300
| +276% | +$320K |
2020 Q1
26 quarters
|
|
3866
CALL
NetEase
NTES
$78.1B
| $388K | ﹤0.01% |
3,200
-15,700
| -83% | -$1.95M |
2014 Q4
47 quarters
|
|
3867
PUT
Zevra Therapeutics
ZVRA
$566M
| $387K | ﹤0.01% |
35,300
+13,000
| +58% | +$154K |
2021 Q1
22 quarters
|
|
3868
PUT
Seabridge Gold
SA
$2.65B
| $385K | ﹤0.01% |
35,700
+6,000
| +20% | +$176K |
2015 Q3
44 quarters
|
|
3869
CALL
Freedom Holding
FRHC
$10B
| $385K | ﹤0.01% |
+2,300
| New | +$369K |
2026 Q3
0 quarters
|
|
3870
PUT
Mirum Pharmaceuticals
MIRM
$6.02B
| $385K | ﹤0.01% |
4,500
+800
| +22% | +$83.5K |
2026 Q1
2 quarters
|
|
3871
PUT
PACCAR
PCAR
$55.9B
| $384K | ﹤0.01% |
3,500
+500
| +17% | +$62.6K |
2017 Q1
38 quarters
|
|
3872
Power Integrations
POWI
$2.45B
| $384K | ﹤0.01% |
7,419
-13,048
| -64% | -$774K |
2025 Q3
4 quarters
|
|
3873
CALL
DELISTED
Bowman Consulting
BWMN
| $384K | ﹤0.01% |
9,000
+8,100
| +900% | +$291K |
2026 Q2
1 quarter
|
|
3874
Wave Life Sciences
WVE
$617M
| $384K | ﹤0.01% |
103,673
+87,881
| +556% | +$462K |
2024 Q1
10 quarters
|
|
3875
Limbach Holdings
LMB
$655M
| $383K | ﹤0.01% |
+7,823
| New | +$450K |
2026 Q3
0 quarters
|
|
Similar funds
Simplex Trading's Q3 2026 Portfolio in Review
As of Q3 2026, Simplex Trading held 10,644 positions worth $184B, up 7.8% from $171B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q3 2026 filing shows 1,493 new, 3,697 increased, 3,633 reduced and 1,534 closed positions. Its largest new stake was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M. The largest sale was Alphabet (Google) Class A, an estimated $128M.
By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q3 2026 buy was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q3 2026, an estimated $92.6M increase.
- Simplex Trading's biggest Q3 2026 reduction was NVIDIA, cutting an estimated $97.8M.
- Simplex Trading fully exited Alphabet (Google) Class A in Q3 2026, selling an estimated $128M.
- Simplex Trading's ten largest holdings make up 51% of its $184B portfolio in Q3 2026.
- Simplex Trading opened 1,493 new positions and closed 1,534 in Q3 2026.
- Simplex Trading's portfolio value rose 7.8% quarter-over-quarter to $184B.
Based on Simplex Trading's 13F filing for Q3 2026, filed 4 Nov 2026.