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Simplex Trading

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
Cap. Flow
-$519M
Cap. Flow %
-0.28%
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
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$92.6M
2
HYG icon
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
+$80.6M
3
AMZN icon
Amazon
AMZN
+$26.3M
4
XLI icon
State Street Industrial Select Sector SPDR ETF
XLI
+$25.7M
5
GLD icon
SPDR Gold Trust
GLD
+$20.7M

Top Sells

Rank Stock Value
1
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$128M
2
NVDA icon
NVIDIA
NVDA
+$97.8M
3
TSLA icon
Tesla
TSLA
+$53.9M
4
MU icon
Micron Technology
MU
+$50M
5
USO icon
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
WEN icon
2401
PUT
Wendy's
WEN
$1.59B
$1.35M ﹤0.01%
211,200
-38,300
-15% -$295K
2017 Q1
38 quarters
RHI icon
2402
PUT
Robert Half
RHI
$4.32B
$1.35M ﹤0.01%
36,600
+5,800
+19% +$229K
2019 Q1
30 quarters
AXTI icon
2403
AXT Inc
AXTI
$3.08B
$1.34M ﹤0.01%
17,369
+13,291
+326% +$858K
2023 Q2
13 quarters
RGTI icon
2404
Rigetti Computing
RGTI
$3.71B
$1.34M ﹤0.01%
85,335
+22,569
+36% +$364K
2025 Q3
4 quarters
PLUG icon
2405
PUT
Plug Power
PLUG
$1.89B
$1.34M ﹤0.01%
692,300
+64,500
+10% +$140K
2016 Q4
39 quarters
ARR icon
2406
CALL
Armour Residential REIT
ARR
$1.72B
$1.34M ﹤0.01%
96,900
+20,400
+27% +$329K
2018 Q1
34 quarters
KEYS icon
2407
Keysight
KEYS
$52B
$1.34M ﹤0.01%
3,681
+2,866
+352% +$944K
2026 Q1
2 quarters
FLYW icon
2408
PUT
Flywire
FLYW
$2.77B
$1.34M ﹤0.01%
76,400
+76,100
+25,367% +$1.36M
2023 Q2
13 quarters
BAX icon
2409
PUT
Baxter International
BAX
$13.6B
$1.34M ﹤0.01%
55,700
-2,800
-5% -$68.8K
2021 Q2
21 quarters
KLAR icon
2410
Klarna Group
KLAR
$5.11B
$1.34M ﹤0.01%
107,850
+56,815
+111% +$949K
2026 Q2
1 quarter
HNST icon
2411
CALL
The Honest Company
HNST
$558M
$1.34M ﹤0.01%
260,400
+22,600
+10% +$108K
2021 Q2
21 quarters
SIVR icon
2412
CALL
abrdn Physical Silver Shares ETF
SIVR
$3.49B
$1.34M ﹤0.01%
23,300
+1,500
+7% +$89.3K
2019 Q3
28 quarters
TGS icon
2413
CALL
Transportadora de Gas del Sur
TGS
$3.2B
$1.33M ﹤0.01%
51,400
+49,900
+3,327% +$1.45M
2026 Q1
2 quarters
FIS icon
2414
PUT
Fidelity National Information Services
FIS
$15.6B
$1.33M ﹤0.01%
40,500
+26,900
+198% +$1.09M
2026 Q1
2 quarters
METC icon
2415
PUT
Ramaco Resources Class A
METC
$461M
$1.33M ﹤0.01%
160,900
-7,100
-4% -$79.7K
2021 Q4
19 quarters
TECX icon
2416
PUT
Tectonic Therapeutic
TECX
$429M
$1.33M ﹤0.01%
57,100
+55,900
+4,658% +$1.75M
2025 Q2
5 quarters
ALKT icon
2417
Alkami Technology
ALKT
$1.51B
$1.33M ﹤0.01%
97,020
+75,314
+347% +$1.39M
2025 Q1
6 quarters
KGC icon
2418
Kinross Gold
KGC
$25.3B
$1.33M ﹤0.01%
55,140
+24,261
+79% +$649K
2025 Q4
3 quarters
ANGX icon
2419
CALL
Angel Studios
ANGX
$803M
$1.33M ﹤0.01%
283,900
+237,200
+508% +$1.05M
2025 Q4
3 quarters
CRH icon
2420
CALL
CRH
CRH
$64B
$1.32M ﹤0.01%
16,000
-38,100
-70% -$3.65M
2023 Q1
14 quarters
GXO icon
2421
PUT
GXO Logistics
GXO
$6.22B
$1.32M ﹤0.01%
29,800
-24,800
-45% -$1.2M
2021 Q4
19 quarters
CHKP icon
2422
Check Point Software Technologies
CHKP
$15B
$1.32M ﹤0.01%
+10,296
New +$1.37M
2026 Q3
0 quarters
XE icon
2423
X-Energy Inc
XE
$3.14B
$1.32M ﹤0.01%
93,176
+68,235
+274% +$1.17M
2026 Q2
1 quarter
IMVT icon
2424
Immunovant
IMVT
$7.67B
$1.32M ﹤0.01%
39,090
-11,990
-23% -$473K
2025 Q2
5 quarters
AXON icon
2425
Axon Enterprise
AXON
$25.7B
$1.32M ﹤0.01%
3,124
+2,078
+199% +$1.12M
2026 Q2
1 quarter
95 96
97
98 99

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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.